lauantai, 30. heinäkuu 2022

Alzheimerin taudin beta-amyloiditeorian perustavin tutkimusraportti on väärennetty

 

Minnesota yliopiston Sylvain Lesnén tutkimus on 16 vuoden ajan johtanut harhaan kaikkea myöhempää tutkimusta. Aluksi teoria ei herättänytkään erityisempää huomi-ota mm. siksi, että sen alan kriittinen huomio oli tuolloin kiinnittyneenä paljastuneisiin vääristeltyihin Alzheimer-lääkkeiden vaikuttavuustutkimuksiin. San Franciscon ylio-piston muuntogeenisten hiirien tutkija Karen Ashe kuitenkin toi kuvaan uuden "todis-teen":muuntogeenisen hiiren,jonka ihmisen beta-amyloidi56 kertyi aivoihin ja heiken- si elukan muistia. Itse asiassa se ei edes ollut ihan samaa beta-amyloidia - ja toisek-seen voidaan kysyä, että minkähänlainen geeneteknologisesti tuotettu aivoihin kerty-vä kemikaali EI aiheittaisi esimerkiksi juuri muisti heikkenemistä... Hiirelle aiheutettiin keinitekoinen sairaus, jonka väitettiin todistavan jotakin ihmisen Alzheimerista. Sitä en tiedä, yritettiinkö sitä mahdollisesti hiirellä myös "parantaa" ja saavutettiinko siinä jotakin menestystä...

Tämä kaikki ei kuitenkaan tarkoita, että beta-amyloiditeoria olisi väärä. Mutta tutkimus ja raportti ovat vahvasti "paranneltuja".

Ja kuinkahan paljon sen takia on ollut vääriä, turhia tai puuttuvia hoitoja... Sitä vasta tutkitaan.

https://www.is.fi/ulkomaat/art-2000008971601.html

Science: Valtava määrä Alzheimer-tutkimusta saattaa perustua vääristeltyihin tuloksiin

Toinen paljon siteeratun tutkimuksen tekijöistä on pyytänyt, että tutkimus vedetään pois kokonaisuudessaan.

Screenshot%202022-07-29%20at%2003-35-03%

Lääkäri osoittaa Alzheimerin tautia sairastavan aivoista otettuja kuvia. Kuva: Colourbox

Ina Kauppinen
28.7. 12:47 | Päivitetty 28.7. 20:47

Vuonna 2006 Nature-lehdessä julkaistiin uraauurtava, sittemmin paljon siteerattu tutkimus Alzheimerin taudin syntyyn liittyvistä tekijöistä. Nyt useiden tutkimuksessa käytettyjen kuvien oikeellisuus ja sitä myötä itse tutkimus on kyseenalaistettu, Science-lehti uutisoi.

Jotkut Alzheimerin tautiin perehtyneet asiantuntijat pelkäävät, että tutkimus on osaltaan ohjannut Alzheimer-tutkimusta väärään suuntaan 16 vuotta.

– Välitön, itsestäänselvä vahinko on se,että Yhdysvaltojen terveysviraston rahoitusta on tuhlattu ja se, että ihmiset ovat käyttäneet näitä tuloksia lähtökohtana omille kokeilleen, jolloin on tuhlattu pohdintoja tällä alalla, totesi Alzheimerin tautiin ja siihen liittyviin tiloihin perehtynyt biokemisti ja Nobel-palkinnon saanut Thomas Südhof.

Jo vuosikymmenien ajan johtava teoria Alzheimerin tutkimuksessa on yksinkertais-tettuna ollut,että beeta-amyloidi muodostaa aivoihin plakkia,joka aiheuttaa Alzheime- rin taudin. Todennäköisimpinä hoitomuotona on pidetty sitä,että estettäisiin amyloidin kertyminen.

Vuonna 2006 julkaistussa tutkimuksessa tunnistettiin ensimmäistä kertaa aiemmin tuntematon beeta-amyloidiyhdiste,jonka todettiin aiheuttavan muistin heikkenemistä. Tutkimusta on siteerattu noin 2 300:ssa tieteellisessä artikkelissa.

_2022072_nf_ad_lesne.jpg

Sylvain Lesné
University of Minnesota, Twin Cities
 

Tutkimuksen tekivät arvostetut neurotutkijat Karen Ashe ja Sylvain Lesné.

Jälkimmäinen ei ole suostunut kommentoimaan kohua. Ashe sen sijaan sanoi NBC Newsille lähetetyssä lausunnossaan toivovansa, että tutkimus vedettäisiin pois kokonaisuudessaan. Hän kuitenkin sanoi, ettei ”tämä kyseenalaista beeta-amyloidia koskevaa hypoteesia”.

_2022072_nf_ad_ashe.jpg
 
Karen Ashe
University of Minnesota, Twin Cities
N. Desai/Science
 

– Työskenneltyäni vuosikymmeniä ymmärtääkseni Alzheimerin taudin syytä, jotta parempia hoitokeinoja löytyisi potilaille, on järkyttävää saada selville, että kollega on voinut johtaa harhaan minua ja tieteellistä yhteisöä peukaloimalla kuvia.

Nature-lehti on julkaissut tutkimuksen yhteydessä tekstin, jonka mukaan lehti tutkimuksessa esitettyjä lukuja on kyseenalaistettu ja väitteitä tutkitaan parhaillaan.

Yhdysvaltojen terveysvirasto käytti tänä tilivuonna lähes 1,6 miljardia dollaria (1,57 miljardia euroa) projekteihin, joissa on mainittu amyloidi. Se on noin puolet kaikesta Alzheimerin tutkimukseen suunnatusta rahoituksesta.

Sadat kliiniset kokeet ovat kuitenkin pitkälti epäonnistuneet löytämään ratkaisua Alzheimerin etenemisen estämiseen.

Kesäkuussa Yhdysvaltojen elintarvike- ja lääkevirasto FDA hyväksyi ensimmäistä kertaa 20 vuoteen Alzheimerin taudin hoitoon tarkoitetun lääkkeen. Monet asiantun-tijat ovat kuitenkin kritisoineet lääkettä, huomauttaen ristiriitaisuuksista kliinisissä testeissä. FDA päätyi edellyttämään, että lääkeyhtiö jatkaa kliinisiä testejä lääkkeen hyötyjen vahvistamiseksi.

[PS:Karen Hsiao Ashen nimi on noussut esiin toisessakin AIKAISEMMASSA ja "aat- teellisemmassa" suuren luokan informaatiosota-haistapaskantiedeyhteydessä anti-pavlovistseen erityiseen rotuevoluutioteoriiaan liittyen sellaiselle täys-antipavlovisti-sesti "todisteiksi" tulkittuja "koetuloksia" tehtailleiden Suma Jacobin, Carole Oberin ja Martha K. McClintockin tutkimus(laitos)kumppanina. Hän vaikuttaisi olevan homman harjaantunut infosotakonna, kun taas Lesné voisi olla enemmän määräraha- ja julkisuushuijari.]

https://www.science.org/content/article/potential-fabrication-research-images-threatens-key-theory-alzheimers-disease

" Blots on a field?

A neuroscience image sleuth finds signs of fabrication in scores of Alzheimer’s articles, threatening a reigning theory of the disease

Neuroscientist and physician Matthew Schrag found suspect images in dozens of papers involving Alzheimer’s disease, including Western blots (projected in green) measuring a protein linked to cognitive decline in rats.Joseph Ross
 
A version of this story appeared in Science, Vol 377, Issue 6604.
 
In August 2021, Matthew Schrag, a neuroscientist and physician at Vanderbilt Uni-versity, got a call that would plunge him into a maelstrom of possible scientific mis-conduct. A colleague wanted to connect him with an attorney investigating an experi-mental drug for Alzheimer’s disease called Simufilam.The drug’s developer Cassava Sciences claimed it improved cognition, partly by repairing a protein that can block sticky brain deposits of the protein amyloid beta (Aβ), a hallmark of Alzheimer’s. The attorney’s clients - two prominent neuroscientists who are also short sellers who profit if the company’s stock falls - believed some research related to Simufilam may have been “fraudulent,” according to a petition later filed on their behalf with the U.S. Food and Drug Administration (FDA).
 
Schrag, 37, a softspoken, nonchalantly rumpled junior professor, had already gained some notoriety by publicly criticizing the controversial FDA approval of the anti-Aβ drug Aduhelm. His own research also contradicted some of Cassava’s claims. He feared volunteers in ongoing Simufilam trials faced risks of side effects with no chance of benefit.
 
So he applied his technical and medical knowledge to interrogate published images about the drug and its underlying science - for which the attorney paid him $18,000. He identified apparently altered or duplicated images in dozens of journal articles. The attorney reported many of the discoveries in the FDA petition, and Schrag sent all of them to the National Institutes of Health (NIH), which had invested tens of mil-lions of dollars in the work. (Cassava denies any misconduct [see sidebar, below].)
 
But Schrag’s sleuthing drew him into a different episode of possible misconduct, leading to findings that threaten one of the most cited Alzheimer’s studies of this century and numerous related experiments.
 
The first author of that influential study, published in Nature in 2006, was an ascen-ding neuroscientist: Sylvain Lesné of the University of Minnesota (UMN), Twin Cities. His work underpins a key element of the dominant yet controversial amyloid hypo-thesis of Alzheimer’s, which holds that Aβ clumps, known as plaques, in brain tissue are a primary cause of the devastating illness, which afflicts tens of millions globally. In what looked like a smoking gun for the theory and a lead to possible therapies, Lesné and his colleagues discovered an Aβ subtype and seemed to prove it caused dementia in rats. If Schrag’s doubts are correct, Lesné’s findings were an elaborate mirage.
 
Schrag, who had not publicly revealed his role as a whistleblower until this article, avoids the word “fraud” in his critiques of Lesné’s work and the Cassava-related studies and does not claim to have proved misconduct. That would require access to original, complete, unpublished images and in some cases raw numerical data. “I focus on what we can see in the published images, and describe them as red flags, not final conclusions,” he says. “The data should speak for itself.”
 
A 6-month investigation by Science provided strong support for Schrag’s suspicions and raised questions about Lesné’s research. A leading independent image analyst and several top Alzheimer’s researchers - including George Perry of the University of Texas, San Antonio, and John Forsayeth of the University of California, San Fran-cisco (UCSF) — reviewed most of Schrag’s findings at Science’s request. They con-curred with his overall conclusions, which cast doubt on hundreds of images, inclu-ding more than 70 in Lesné’s papers. Some look like “shockingly blatant” examples of image tampering, says Donna Wilcock, an Alzheimer’s expert at the University of Kentucky.
 
The authors “appeared to have composed figures by piecing together parts of pho-tos from different experiments,” says Elisabeth Bik, a molecular biologist and well-known forensic image consultant. “The obtained experimental results might not have been the desired results, and that data might have been changed to … better fit a hypothesis.”
 
The immediate, obvious damage is wasted NIH funding and wasted thinking in the field because people are using these results as a starting point for their own experiments.
 
Thomas Südhof
Stanford University
 
Early this year,Schrag raised his doubts with NIH and journals including Nature; two, including Nature last week, have published expressions of concern about papers by Lesné. Schrag’s work, done independently of Vanderbilt and its medical center, imp-lies millions of federal dollars may have been misspent on the research — and much more on related efforts. Some Alzheimer’s experts now suspect Lesné’s studies have misdirected Alzheimer’s research for 16 years.
 
“The immediate, obvious damage is wasted NIH funding and wasted thinking in the field because people are using these results as a starting point for their own experi-ments,” says Stanford University neuroscientist Thomas Südhof, a Nobel laureate and expert on Alzheimer’s and related conditions.
 
Lesné did not respond to requests for comment. A UMN spokesperson says the university is reviewing complaints about his work.
 
To Schrag, the two disputed threads of Aβ research raise far-reaching questions about scientific integrity in the struggle to understand and cure Alzheimer’s. Some adherents of the amyloid hypothesis are too uncritical of work that seems to support it, he says. “Even if misconduct is rare, false ideas inserted into key nodes in our body of scientific knowledge can warp our understanding.”
 
In his modest office, steps away from a buzzing refrigerator, Schrag displays an antique microscope - an homage to predecessors who applied painstaking bench science to medicine’s endless enigmas. A small sign on his desk reads, “Everything is figureoutable.”
 
So far, Alzheimer’s has been an exception. But Schrag’s background has left him comfortable with the field’s contradictions. His father hails from a family of Menno-nites, known for their philosophy of peacemaking - but joined the military. The family moved from Arizona to Germany to England before settling in Davenport, a tiny cow town in eastern Washington. After leaving the Air Force, Schrag’s dad became a nurse and worked in a nursing home. As a young teen, Schrag volunteered to visit dementia patients there. “I remembered being mystified by a lot of the strange beha-viors,” he says. It was a formative experience “to see people struggling with such unfair symptoms.”
 
Home-schooled by his mom, Schrag entered community college at 16, like many of the town’s studious kids - including his teenage sweetheart and future wife, Sarah. They now live on a small ranch outside Nashville with their two young children and three aging horses that Sarah grew up with.
 
While prepping for medical school at the University of North Dakota, Schrag spent long hours in a neuropharmacology lab absorbing the patient rhythms of science. He repeated experiments over and over,refining his skills.These included a protein iden- tification method known as the Western blot. It uses electricity to drive protein-rich tissue samples through a gel that acts like a sieve to separate the molecules by size. Distinct proteins, tagged and illuminated by fluorescent antibodies, appear as stacked bands.
 
In 2006, Schrag’s first publication examined how feeding a high-cholesterol diet to rabbits seemed to increase Aβ plaques and iron deposits in one part of their brains. Not long afterward, when he was an M.D.-Ph.D. student at Loma Linda University, another research group found support for a link between Alzheimer’s and iron meta-bolism. Encouraged, Schrag poured his energy into trying to confirm the connection in people - and failed.The experience introduced him to a disquieting element of Alz-heimer’s research. With this enigmatic, complex disease, even careful experiments done in good faith can fail to replicate, leading to dead ends and unexpected setbacks.
 
One of its biggest mysteries is also its most distinctive feature: the plaques and other protein deposits that German pathologist Alois Alzheimer first saw in 1906 in the brain of a deceased dementia patient. In 1984, Aβ was identified as the main com-ponent of the plaques. And in 1991, researchers traced family-linked Alzheimer’s to mutations in the gene for a precursor protein from which amyloid derives. To many scientists, it seemed clear that Aβ buildup sets off a cascade of damage and dys-function in neurons, causing dementia. Stopping amyloid deposits became the most plausible therapeutic strategy.
 
Hundreds of clinical trials of amyloidtargeted therapies have yielded few glimmers of promise,however;only the underwhelming Aduhelm has gained FDA approval.Yet Aβ still dominates research and drug development. NIH spent about $1.6 billion on pro-jects that mention amyloids in this fiscal year, about half its overall Alzheimer’s fun-ding. Scientists who advance other potential Alzheimer’s causes, such as immune dysfunction or inflammation, complain they have been sidelined by the “amyloid ma-fia.” Forsayeth says the amyloid hypothesis became “the scientific equivalent of the Ptolemaic model of the Solar System,” in which the Sun and planets rotate around Earth.
 
By 2006, the centenary of Alois Alzheimer’s epic discovery, a growing cadre of skep-tics wondered aloud whether the field needed a reset. Then, a breathtaking Nature paper entered the breach.
 
It emerged from the lab of UMN physician and neuroscientist Karen Ashe, who had already made a remarkable series of discoveries. As a medical resident at UCSF, she contributed to Nobel laureate Stanley Prusiner’s pioneering work on prions - infectious proteins that cause rare neurological disorders. In the mid-1990s, she created a transgenic mouse that churns out human Aβ, which forms plaques in the animal’s brain. The mouse also shows dementia-like symptoms. It became a favored Alzheimer’s model.
 
By the early 2000s, “toxic oligomers,” subtypes of Aβ that dissolve in some bodily fluids, had gained currency as a likely chief culprit for Alzheimer’s - potentially more pathogenic than the insoluble plaques. Amyloid oligomers had been linked to im-paired communication between neurons in vitro and in animals, and autopsies have shown higher levels of the oligomers in people with Alzheimer’s than in cognitively sound individuals. But no one had proved that any one of the many known oligomers directly caused cognitive decline.
 
In the brains of Ashe’s transgenic mice, the UMN team discovered a previously un-known oligomer species, dubbed Aβ*56 (pronounced “amyloid beta star 56”) after its relatively heavy molecular weight compared with other oligomers. The group isolated Aβ*56 and injected it into young rats. The rats’ capacity to recall simple, previously learned information - such as the location of a hidden platform in a maze - plumme-ted. The 2006 paper’s first author, sometimes credited as the discoverer of Aβ*56, was Lesné, a young scientist Ashe had hired straight out of a Ph.D. program at the University of Caen Normandy in France.
 
Ashe touted Aβ*56 on her website as “the first substance ever identified in brain tis-sue in Alzheimer’s research that has been shown to cause memory impairment.” An accompanying editorial in Nature called Aβ*56 “a star suspect” in Alzheimer’s. Alzfo- rum, a widely read online hub for the field,titled its coverage, “Aβ Star is Born?” Less than 2 weeks after the paper was published, Ashe won the prestigious Potamkin Prize for neuroscience, partly for work leading to Aβ*56.
 
The Nature paper has been cited in about 2300 scholarly articles - more than all but four other Alzheimer’s basic research reports published since 2006, according to the Web of Science database. Since then, annual NIH support for studies labeled “amy-loid, oligomer, and Alzheimer’s” has risen from near zero to $287 million in 2021. Lesné and Ashe helped spark that explosion, experts say.
 
The paper provided an “important boost” to the amyloid and toxic oligomer hypothe-ses when they faced rising doubts, Südhof says. “Proponents loved it, because it seemed to be an independent validation of what they have been proposing for a long time.”
 
“That was a really big finding that kind of turned the field on its head,” partly because of Ashe’s impeccable imprimatur, Wilcock says. “It drove a lot of other investigators to … go looking for these [heavier] oligomer species.”
 
As Ashe’s star burned more brightly, Lesné’s rose. He joined UMN with his own NIH-funded lab in 2009. Aβ*56 remained a primary research focus. Megan Larson, who worked as a junior scientist for Lesné and is now a product manager at Bio-Techne, a biosciences supply company, calls him passionate, hardworking, and charismatic. She and others in the lab often ran experiments and produced Western blots, Larson says, but in their papers together, Lesné prepared all the images for publication.
 
He became a leader of UMN’s neuroscience graduate program in 2020, and in May 2022,4 months after Schrag delivered his concerns to NIH,Lesné received a coveted R01 grant from the agency, with up to 5 years of support.The NIH program officer for the grant, Austin Yang - a co-author on the 2006 Nature paper - declined to comment.
 
In December 2021, Schrag visited PubPeer, a website where scientists flag possible errors in published papers. Many of the site’s posts come from technical gumshoes who deconstruct Western blots for telltale marks indicating that bands representing proteins could have been removed or inserted where they don’t belong. Such mani-pulations can falsely suggest a protein is present - or alter the levels at which a de-tected protein is apparently found. Schrag, still focused on Cassava-linked scientists, was looking for examples that could refine his own sleuthing.
 
In a PubPeer search for “Alzheimer’s,” postings about articles in The Journal of Neu-roscience caught Schrag’s eye. They questioned the authenticity of blots used to dif-ferentiate Aβ and similar proteins in mouse brain tissue.Several bands seemed to be duplicated.Using software tools,Schrag confirmed the PubPeer comments and found similar problems with other blots in the same articles. He also found some blot backgrounds that seemed to have been improperly duplicated.
 
How an image sleuth uncovered possible tampering
 
Vanderbilt University neuroscientist Matthew Schrag found apparently falsified ima-ges in papers by University of Minnesota, Twin Cities, neuroscientist Sylvain Lesné, including a 2006 paper in Nature co-authored with Karen Ashe and others. It linked an amyloid-beta (Aβ) protein, Aβ*56, to Alzheimer’s dementia.(Graphic) C. Bickel / Science; (Data) S. Lesné et al., Nature 440, 352 (2006).
 
https://doi.org/10.1038/nature04533
 
Three of the papers listed Lesné, whom Schrag had never heard of, as first or senior author. Schrag quickly found that another Lesné paper had also drawn scrutiny on PubPeer, and he broadened his search to Lesné papers that had not been flagged there. The investigation “developed organically,” he says, as other apparent problems emerged.
 
“So much in our field is not reproducible, so it’s a huge advantage to understand when data streams might not be reliable,” Schrag says.“Some of that’s going to happen reproducing data on the bench. But if it can happen in simpler, faster ways - such as image analysis - it should".Eventually Schrag ran across the seminal Nature paper, the basis for many others. It, too,seemed to contain multiple doctored images.
 
Science asked two independent image analysts - Bik and Jana Christopher - to review Schrag’s findings about that paper and others by Lesné. They say some supposed manipulation might be digital artifacts that can occur inadvertently during image processing, a possibility Schrag concedes. But Bik found his conclusions compelling and sound. Christopher concurred about the many duplicated images and some markings suggesting cut-and-pasted Western blots flagged by Schrag. She also identified additional dubious blots and backgrounds he had missed.
 
In the 16 years following the landmark paper, Lesné and Ashe - separately or jointly - published many articles on their stellar oligomer. Yet only a handful of other groups have reported detecting Aβ*56.
 
Citing the ongoing UMN review of Lesné’s work, Ashe declined via email to be inter-viewed or to answer written questions posed by Science, which she called “sobe-ring.” But she wrote, “I still have faith in Aβ*56,” noting her ongoing work studying the structure of Aβ oligomers. “We have promising initial results. I remain excited about this work, and believe it has the potential to explain why Aβ therapies may yet work despite recent failures targeting amyloid plaques.”
 
But even before Schrag’s investigation, the spotty evidence that Aβ*56 plays a role in Alzheimer’s had raised eyebrows. Wilcock has long doubted studies that claim to use “purified” Aβ*56. Such oligomers are notoriously unstable, converting to other oligomer types spontaneously. Multiple types can be present in a sample even after purification efforts, making it hard to say any cognitive effects are due to Aβ*56 alone, she notes - assuming it exists. In fact, Wilcock and others say, several labs have tried and failed to find Aβ*56, although few have published those findings. Journals are often uninterested in negative results, and researchers can be reluctant to contradict a famous investigator.
 
An exception was Harvard University’s Dennis Selkoe, a leading advocate of the amyloid and toxic oligomer hypotheses, who has cited the Nature paper at least 13 times. In two 2008 papers, Selkoe said he could not find Aβ*56 in human fluids or tissues.
 
Selkoe examined Schrag’s dossier on Lesné’s papers at Science’s request,and says he finds it credible and well supported. He did not see manipulation in every suspect image, but says, “There are certainly at least 12 or 15 images where I would agree that there is no other explanation” than manipulation. One - an image in the Nature paper displaying purified Aβ*56 - shows “very worrisome” signs of tampering, Selkoe says. The same image reappeared in a different paper, co-authored by Lesné and Ashe, 5 years later. Many other images in Lesné’s papers might be improper - more than enough to challenge the body of work, Selkoe adds.
 
A few of Lesné’s questioned papers describe a technique he developed to measure Aβ oligomers separately in brain cells, spaces outside the cells,and cell membranes. Selkoe recalls Ashe talking about her “brilliant postdoctoral fellow” who devised it. He was skeptical of Lesné’s claim that oligomers could be analyzed separately inside and outside cells in a mixture of soluble material from frozen or processed brain tissue. “All of us who heard about that knew in a moment that it made no biochemical sense. If it did, we’d all be using a method like that,” Selkoe says. The Nature paper depended on that method.
 
Selkoe himself co-authored a 2006 paper with Lesné in the Annals of Neurology. They sought to neutralize the effects of toxic oligomers, although not Aβ*56. The paper includes an image that Schrag, Bik, and Christopher agree was reprinted as if original in two subsequent Lesné articles. Selkoe calls that “highly egregious.”
 
Given those findings, the scarcity of independent confirmation of the Aβ*56 claims seems telling, Selkoe says. “In science, once you publish your data, if it’s not readily replicated, then there is real concern that it’s not correct or true. There’s precious little clearcut evidence that Aβ*56 exists, or if it exists, correlates in a reproducible fashion with features of Alzheimer’s—even in animal models.”
 
In all, Schrag or Bik identified more than 20 suspect Lesné papers; 10 concerned Aβ*56. Schrag contacted several of the journals starting early this year, and Lesné and his collaborators recently published two corrections. One for a 2012 paper in The Journal of Neuroscience replaced several images Schrag had flagged as problematic, writing that the earlier versions had been “processed inappropriately.” But Schrag says even the corrected images show numerous signs of improper changes in bands, and in one case, complete replacement of a blot.
 
A 2013 Brain paper in which Schrag had flagged multiple images was also exten-sively corrected in May. Lesné and Ashe were the first and senior authors, respecti-vely, of the study, which showed “negligible” levels of Aβ*56 in children and young adults, more when people reached their 40s,and steadily increasing levels after that. It concluded that Aβ*56 “may play a pathogenic role very early in the pathogenesis of Alzheimer’s disease.” The authors said the correction had no bearing on the study’s findings.
 
Schrag isn’t convinced. Among other problems, one corrected blot shows multiple bands that appear to have been added or removed artificially, he says.
 
Selkoe calls the apparently falsified corrections “shocking,” particularly in light of Ashe’s pride in the 2006 Nature paper. “I don’t see how she would not hyperscrutinize anything that subsequently related to Aβ*56,” he says.
 
After Science contacted Ashe, she separately posted to PubPeer a defense of some images Schrag had challenged in the Nature paper. She supplied portions of a few original,unpublished versions that do not show the apparent digital cut marks Schrag had detected in the published images. That suggests the markings were harmless digital artifacts. Yet the original images reveal something that Schrag and Selkoe find even more incriminating: unequivocal evidence that, despite the lack of obvious cut marks, multiple bands were copied and pasted from adjacent areas (see graphic, above).
 
Schrag could find no innocent explanation for a 2-decade litany of oddities. In experi-ment after experiment using Western blots,microscopy,and other techniques, serious anomalies emerged. But he notes that he has not examined the original, uncropped, high-resolution images. Authors sometimes share those with researchers conducting similar work, although they usually ignore such requests, according to recent studies of datasharing practices. Sharing agreements do not include access for independent misconduct detectives. Lesné and Ashe did not respond to a Science request for those images. Questions about Lesné’s work are not new. Cell biologist Denis Vivien, a senior scientist at Caen, co-authored five Lesné papers flagged by Schrag or Bik. Vivien defends the validity of those articles, but says he had reason to be wary of Lesné.
 
Toward the end of Lesné’s time in France, Vivien says they worked together on a pa-per for Nature Neuroscience involving Aβ.During final revisions, he saw immunostai- ning images - in which antibodies detect proteins in tissue samples - that Lesné had provided. They looked dubious to Vivien,and he asked other students to replicate the findings. Their efforts failed. Vivien says he confronted Lesné, who denied wrongdo-ing. Although Vivien lacked “irrefutable proof” of misconduct, he withdrew the paper before publication “to preserve my scientific integrity,” and broke off all contact with Lesné, he says. “We are never safe from a student who would like to deceive us and we must remain vigilant.”
 
Schrag spot checked papers by Vivien or Ashe without Lesné. He found no anomalies - suggesting Vivien and Ashe were innocent of misconduct.
 
Yet senior scientists must balance the trust essential to fostering a protégé’s inde-pendence with prudent verification, Wilcock says. If you sign off on images time after time, claim credit, speak publicly, and win awards for the work - as Ashe has done - you have to be sure it’s right, she adds.
 
“Ashe obviously failed in that very serious duty” to ask tough questions and ensure the data’s accuracy, Forsayeth says. “It was a major ethical lapse.”
 
In his whistleblower report to NIH about Lesné’s research, Schrag made its scope and stakes clear:“[This] dossier is a fraction of the anomalies easily visible on review of the publicly accessible data,” he wrote. The suspect work “not only represents a substantial investment in [NIH] research support, but has been cited … thousands of times and thus has the potential to mislead an entire field of research.”
 
The agency’s reply,which Schrag shared with Science,noted that complaints deemed credible will go to the Department of Health and Human Services Office of Research Integrity (ORI) for review. That agency could then instruct grantee universities to in-vestigate prior to a final ORI review,a process that can take years and remains confi- dential absent an official misconduct finding. To Science, NIH said it takes research misconduct seriously, but otherwise declined to comment.
 
In the fanfare around the Lesné-Ashe work, some Alzheimer’s experts see a failure of skepticism, including by journals that published the work. After Schrag contacted Nature, Science Signaling, and five other journals about 13 papers co-authored by Lesné, a few are under investigation, according to emails he received from editors.
 
“There are very strong, legitimate questions,” John Foley,editor of Science Signaling, later told Science. He says the journal has contacted authors and university officers of two papers from 2016 and 2017 for a response.It also recently issued expressions of concern about the articles.
 
A spokesperson for Nature, which publishes image integrity standards,says the journal takes concerns raised about its papers seriously, but otherwise had no comment. Days after an inquiry from Science, Nature published a note saying it was investigating Lesné’s 2006 paper and advising caution about its results.
 
The Journal of Neuroscience stands out with five suspect Lesné papers. A journal spokesperson said it follows guidelines from the Committee on Publication Ethics to assess concerns, but otherwise had no comment.
 
“Journals and granting institutions don’t know how to deal with image manipulation,” Forsayeth says. “They’re not subjecting images to sophisticated analysis, even though those tools are very widely available. It’s not some magic skill. It’s their job to do the gatekeeping.”
 
You can’t cheat to cure a disease. Biology doesn’t care.
 
Matthew Schrag
Vanderbilt University
 
Holden Thorp,editor-in-chief of the Science journals,said the journals have subjected images to increasing scrutiny, adding that “2017 would have been [near] the begin-ning of when more attention was being paid to this - not just for us,but across scienti- fic publishing.” He cited the Materials Design Analysis Reporting framework deve-loped jointly by several publishers to improve data transparency and weed out image manipulation.
 
As federal agencies, universities, and journals quietly investigate Schrag’s concerns, he decided to try to speed up the process by providing his findings to Science. He knows the move could have personal consequences. By calling out powerful agencies, journals, and scientists, Schrag might jeopardize grants and publications essential to his success.
 
But he says he felt an urgent need to go public about work that might mislead the field and slow the race to save lives. “You can cheat to get a paper. You can cheat to get a degree. You can cheat to get a grant. You can’t cheat to cure a disease,” he says. “Biology doesn’t care.”
 
Like other anti-Aβ efforts, toxic oligomer research has spawned no effective thera-pies. “Many companies have invested millions and millions of dollars, or even billions ... to go after soluble Aβ [oligomers]. And that hasn’t worked,” says Daniel Alkon, president of the bioscience company Synaptogenix, who once directed neurologic research at NIH.
Schrag says oligomers might still a play role in Alzheimer’s. Following the Nature paper, other investigators connected combinations of oligomers to cognitive impai-rment in animals. “The wider story [of oligomers] potentially survives this one prob-lem,” Schrag says. “But it makes you pause and rethink the foundation of the story.”
Selkoe adds that the broader amyloid hypothesis remains viable. “I hope that people will not become faint hearted as a result of what really looks like a very egregious example of malfeasance that’s squarely in the Aβ oligomer field,” he says. But if cur-rent phase 3 clinical trials of three drugs targeting amyloid oligomers all fail,he notes, “the Aβ hypothesis is very much under duress.” Selkoe’s bigger worry,he says,is that the Lesné episode might further undercut pub-lic trust in science during a time of increasing skepticism and attacks. But scientists must show they can find and correct rare cases of apparent misconduct, he says. “We need to declare these examples and warn the world.”
 

With reporting by Meagan Weiland. This story and the related sidebar (below) were supported by the Science Fund for Investigative Reporting.

Related story

Research backing experimental Alzheimer’s drug was first target of suspicion

By Charles Piller

When Vanderbilt University physician and neuroscientist Matthew Schrag first grew suspicious of work underlying a major theory of Alzheimer’s disease (see main story, above), he was following a different trail. In August 2021, he provided analysis for a petition to the Food and Drug Administration (FDA), requesting that it pause two phase 3 clinical trials of Cassava Sciences’s Alzheimer’s drug Simufilam.The petition claimed some science behind the drug might be fraudulent, and the more than 1800 planned trial participants might see no benefits.

That month, Schrag submitted stinging reports to the National Institutes of Health (NIH) about 34 published papers by Cassava-linked scientists, describing “serious concerns of research misconduct".His findings,including possibly manipulated scien-tific images and suspect numerical data,challenge work supported by tens of millions of dollars in NIH funds. Some of the studies suggest Simufilam reinstates the shape and function of the protein filamin A, which Cassava claims causes Alz-heimer’s de-mentia when misfolded. (Other publications have reported on the FDA petition, but not Schrag’s identity. The Wall Street Journal has reported that the U.S. Securities and Exchange Commission is also investigating Cassava.)

In February, FDA refused to pause the trials, calling the petition the wrong way to intervene, but said it might eventually take action. Independent image analysts and Alzheimer’s experts who reviewed Schrag’s findings at Science’s request generally agree with him.

Schrag’s sleuthing implicates work by Cassava Senior Vice President Lindsay Burns , Hoau‑Yan Wang of the City University of New York (CUNY), and Harvard University neurologist Steven Arnold. Wang and Arnold have advised Cassava, and Wang collaborated with the company for 15 years.

None agreed to answer questions from Science. Cassava CEO Remi Barbier also declined to answer questions or to name the company’s current scientific advisers. He said in an email that Schrag’s dossier is “generally consistent with prior allega-tions about our science … such allegations are false.” Cassava hired investigators to review its work, provided “nearly 100,000 pages of documents to an alphabet soup of outside investigative agencies,” and asked CUNY to investigate, he added. That effort “has yielded an important finding to date: there is no evidence of research misconduct.” (CUNY says it takes allegations of misconduct seriously, but otherwise declined to comment because of its ongoing investigation.)

Last year, Schrag reached out to most of the journals that published questioned papers. Seven were retracted — including five by PLOS ONE in April. Three others received expressions of concern; in each case, the editors said they were awaiting completion of the CUNY investigation. In a few cases, the editors told him, reviews were underway.

Cassava has said editors of two suspect papers dismissed misconduct concerns. Last year, the editors of a 2005 Neuroscience paper co-authored by Wang, Burns, and others found no improper manipulation of Western blots, but said in an editorial note they would review any concerns from an “institutional investigation,” apparently CUNY’s probe. They did not respond to additional findings Schrag raised this year.

Another paper that purportedly validated science behind Simufilam - also by Wang, Burns,and colleagues - appeared in 2012 in The Journal of Neuroscience.In Decem- ber 2021, the editors corrected one figure. Barbier said in a statement that they told him they had found no manipulation. But in January, after Schrag and others raised additional doubts, the editors issued an expression of concern — reserving judgment until CUNY completes its investigation.

Schrag received $18,000 from an attorney for short sellers behind the FDA petition, who profit if Cassava’s value falls.Schrag,whose efforts were independent of Vander- bilt,says he worked hundreds of hours on the petition and independent research and he has never shorted Cassava stock or earned other money for efforts on that issue, or for similar work involving University of Minnesota, Twin Cities, neuroscientist Sylvain Lesné. (In either case, if federal authorities determine fraud occurred and demand a return of grant money, Schrag might be eligible to receive a portion of the funds.)

The most influential Cassava-related paper appeared in The Journal of Clinical In-vestigation in 2012. The authors - including Wang; Arnold; David Bennett, who leads a brain-tissue bank at Rush University; and his Rush colleague, neuroscientist Zoe Arvanitakis - linked insulin resistance to Alzheimer’s and the formation of amyloid plaques. Cassava scientists say Simufilam lessens insulin resistance. They relied on a method in which dead brain tissue, frozen for a decade and then partially thawed and chopped, purportedly transmits nerve impulses.

Schrag and others say it contradicts basic neurobiology. Schrag adds that he could find no evidence that other investigators have replicated that result. (None of the authors agreed to be interviewed for this article.)

That paper supported the science behind Simufilam, Schrag says, “and spawned an entire field of research in Alzheimer’s, ‘diabetes of the brain.’” It has been cited more than 1500 times. Schrag sent the journal’s editor his analysis of more than 15 sus-pect images. In an email that Schrag provided to Science, the editor said the journal had reviewed high-resolution versions of the images when they were originally submitted and declined to consider Schrag’s findings.

Correction, 25 July, 11 a.m.: An earlier version of this story misstated when Sylvain Lesné received an NIH R01 grant.

About the author

Charles Piller

mailTwitter

Charles is a contributing correspondent based in Oakland, California.

 

https://katiecouric.com/health/alzheimers-research-fraud-matthew-schrag-sylvain-lesne/

 
" July 27, 2022

Whistleblower Lifts the Lid on “False” Alzheimer’s Research

By Holly Thomas
 
Screenshot%202022-07-29%20at%2004-41-46%

KCM/Getty Images

It appears that critical research that’s formed the basis for treatments of the disease was fabricated.

Alzheimer’s drug trials are notoriously ineffective. Now we may know at least part of the reason why.

A neuroscientist at Vanderbilt University has tipped off the scientific community that critical findings that have formed the foundation of Alzheimer’s research for nearly two decades may have been fabricated.

If this claim bears out, it will mean that for the last two decades, a huge proportion of potential Alzheimer’s drugs have been developed under a false premise,and millions or even billions of dollars in funding - not to mention years of science and thinking - may have been sent after the wrong target.

Who is the Alzheimer’s research whistleblower?

The whistleblower, junior professor Matthew Schrag, MD, Ph.D., first raised his sus-picions around a key 2006 study on Alzheimer’s in a letter to the National Institutes of Health (NIH). When that failed to produce a swift response, he spread the word further, leading Science magazine to conduct its own six-month review of the images Dr. Schrag highlighted. The result seems to have confirmed Dr. Schrag’s fears.

A 2006 paper boosts a convenient theory for Alzheimer’s

The findings that caused Dr. Schrag concern were the keystone of a paper published in Nature magazine in 2006.That paper,“A specific amyloid-β protein assembly in the brain impairs memory,” apparently confirmed a hypothesis about the cause of the memory loss and dementia associated with Alzheimer’s.

The theory centered on “amyloids” (proteins) found in plaque that builds up in the brains of Alzheimer’s patients. These were thought to damage the brain, and in turn, cause the memory loss and cognitive impairment associated with Alzheimer’s.

The 2006 paper, primarily authored by Minnesota neuroscience professor Sylvain Lesné, tested the amyloids-cause-Alzheimer’s theory using young rats. Per Science magazine: “In what looked like a smoking gun for the theory and a lead to possible therapies, Lesné and his colleagues discovered an Aβ subtype [Aβ*56] and seemed to prove it caused dementia in rats.”

Now, it looks like these results may have been fabricated.

Falsified images boost amyloid plaque theory

According to Science magazine‘s investigation,the images the paper used to support this conclusion - as well as images in other studies on the Aβ*56 subtype by Lesné - appear to have been doctored to exaggerate the protein’s part in the development of Alzheimer’s.

Thomas Wisniewski, MD,a professor of neurology at the New York University Alzhei- mer’s Disease Center who wasn’t involved in the Science investigation,told NBC that it was concerning that it hadn’t been possible for researchers to replicate Lesné’s fin-dings in other studies. Dr. Wisniewski added that when he looked at the images, he saw “evidence of what looks like copy and paste” to make a composite picture.

Years of misdirected Alzheimer’s research

The potential reach of this kind of deception is hard to comprehend.Lesné’s research - and the direct connection it seemed to demonstrate between amyloids and Alzhei-mer’s - proved incredibly influential. The Nature paper has been cited in over 2,200 other academic papers, and provoked significant interest in the Aβ*56 protein as a target for Alzheimer’s treatment. According to Science, the NIH funneled about $1.6 billion into projects involving amyloids in this fiscal year - “about half its overall Alzheimer’s funding.”

According to Daily Kos, about 100 out of 130 Alzheimer’s drugs currently in trials are designed to attack these amyloids. In 2021, the FDA approved yet another such medicine, Aduhelm. The $56,000-per-year drug from Biogen is so expensive that it’s expected to inflate premiums for 60 million Medicare enrollees.

As Daily Kos reports, four months after Dr. Schrag reported his concerns to the NIH, the institute awarded Lesné, the 2006 study’s leading author, a five-year grant for Alzheimer’s research. The NIH program director who awarded that grant, Austin Yang, was another of the study’s authors.

“The immediate, obvious damage is wasted NIH funding and wasted thinking in the field because people are using these results as a starting point for their own experi-ments,” Stanford University neuroscientist Thomas Südhof, a Nobel laureate and expert on Alzheimer’s told Science.

Amyloid proteins may well play some role in Alzheimer’s. But judging by Schrag’s findings,and the results of Science’s investigation,it appears that role may be far less significant than has been believed - or at the very least,not involve the Aβ*56 protein apparently identified in Lesné’s research. That means that for 16 years, most new Alzheimer’s drugs in development, and at least half of Alzheimer’s funding, have been based on findings that may now be seriously debunked.

Schrag_Matthew_0.jpg

Matthew S. Schrag, MD, PhD

Assistant Professor of Neurology

Director, Cerebral Amyloid Angiopathy Clinic

[email protected]

***

"Peilineurooni-HUuSsissa" väitetään tiedetyn asia kaiken aikaa:

https://www.is.fi/kotimaa/art-2000008972529.html

Suomalainen asian­tuntija laukoo suorat sanat kohutusta Alzheimer-tutkimuksesta: "Se on lähes nolla­tutkimus"

Jos tietoa on väärennetty, on tutkijan uran oltava ohi, toteaa Husin Pentti Tienari.

Paljon siteeratusta Alzheimer-tutkimuksesta löydettiin viitteitä kuvanmuokkauksesta. Kuva: COLOURBOX, HUS

Joona Laukkanen
29.7. 6:30

Science-lehti julkaisi hiljattain artikkelin, jossa vuonna 2006 Nature-lehdessä julkais-tun ja Sylvain Lesnén teettämän Alzheimer-tutkimuksen väitetään perustuvan osittain väärennettyyn materiaaliin.

Tutkimuksessa tunnistettiin ensimmäistä kertaa aiemmin tuntematon beeta-amyloidiyhdiste, jonka todettiin aiheuttavan muistin heikkenemistä. Tutkimusta on siteerattu noin 2 300:ssa tieteellisessä artikkelissa.

Husin osastonylilääkäri ja neuroimmunologian professori Pentti Tienari on sitä miel-tä, että alkuperäisellä tutkimuksella ei ollut alun alkaenkaan mitään tekemistä ihmisen sairastaman Alzheimerin kanssa.

– Se on lähes nollatutkimus. Se on hiirilääketiedettä. Keinotekoisessa hiirimallissa relevanssi ihmisen Alzheimerin tautiin on nolla, koska siinä ei olla tutkittu yhtäkään ihmisnäytettä, Tienari lataa.

Tienari sanoo, että ei olisi itse hyväksynyt alkuperäistä tutkimustulosta, eikä kukaan muukaan kunnollinen referee eli vertaisarvioija.

– Referee olisi pyytänyt, että mielenkiintoisia havaintoja, mutta osoittakaa ne Alzheimer-potilaalla. Sitä ei ole tehty.

Tienari kuvaa tutkimusta palikkalääketieteeksi: löydetään jokin selkeä molekyyli ja väitetään sen olevan keskeinen Alzheimerin taudissa. Löytö saattaa helposti vaikut-taa merkittävältä, mutta Tienarin mielestä löydös ei ole varteenotettava ennen kuin se tehdään myös oikealla Alzheimer-potilaalla.

Se, että Lesnén löydös olisi tehty hiirillä tai väärennetty, ei tarkoita, että amyloiditeoria olisi väärä.

– Tuo on vain yksittäinen huono tutkimus, Tienari niputtaa.

Screenshot%202022-07-30%20at%2018-32-39%

 

HUS:in neuroimmunologian professori Pentti Tienari ei pidä väärennöksistä syytettyä Alzheimer-tutkimusta merkittävänä. Kuva: HUS

Tienarin mukaan tieteeseen on kehittynyt ryhmittymä tutkijoita,jotka kehittävät keino- tekoisille hiirimalleille hoitokeinoja. Hiiriä käytetään sen takia, koska niistä pystytään eristämään hyvin näytteitä, mutta yhteys ihmisen Alzheimer-tautiin on Tienarin mukaan matala.

Tienari pitää kyseistä tutkimusta ylimarkkinoituna. Suuren siteerausmäärän hän kuit-taa sillä, että hiirien avulla Alzheimer-tutkimustyötä tekevät viittaavat toistensa artikkeleihin ja lukevat toistensa apurahahakemuksia.

1 Lähettänyt: fb_100001941754084 - 30.7.2022 klo 08.31

Kommentit

Ladataan...