Retraction Watch

Tracking retractions as a window into the scientific process

Former prof fudged dozens of images, says university

with 16 comments

On Dec. 2, 2013, Alison Lakin, the research integrity officer at the University of Colorado Denver, received a concerning email.

The emailer was alleging several problems in a 2012 paper in the Journal of Clinical Investigation, co-authored by one of its high-profile faculty members. Lakin discussed the allegations with some administrators and agreed they had merit; Lakin sequestered an author’s laptop and other materials. Over the next few months, the university learned of additional allegations affecting other papers — and discovered even more serious problems in the JCI paper. Namely, the first author had inserted changes to 21 figures in the paper after submitting it, without alerting the other authors, journal, or reviewers.

That journal retracted the paper this month, citing numerous problems:

An investigative committee at the University of Colorado Denver recently reported multiple findings of data falsification and fabrication or lack of underlying supporting data regarding Figures 1, 2, 3, 5, 6, 7, 8, and 9, and Supplemental Figures 6 and 8 in this publication. Due to the numerous manipulations and lack of data to support the published findings, the JCI is retracting this article.

The article, “Equilibrative nucleoside transporter 1 (ENT1) regulates postischemic blood flow during acute kidney injury in mice,” received an expression of concern in 2014 over duplicated images. It has been cited 77 times since 2012 (including 40 since 2014), according to Clarivate Analytics’ Web of Science.

According to the University of Colorado Denver’s investigation report, which we obtained through a public records request, former professor Almut Grenz committed research misconduct. Additional papers by the last author on the JCI paper, Holger Eltzschig, were also found to contain issues that were the result of “error,” not misconduct. Nevertheless, the committee recommended an additional paper (on which Grenz is the last author) be retracted, a correction to a PNAS paper on which she is the second author, and a correction or retraction for a Journal of Immunology paper, on which Grenz is the first author.

A spokesperson from the University of Colorado Denver told us that Grenz has left the university:

As of 2016, Dr. Grenz is no longer an employee of the university. I cannot say the terms under which she left the university.

She added:

Dr. Grenz was the only person confirmed to have engaged in research misconduct.

We were unable to locate Grenz, nor her contact information.

All papers were co-authored by Eltzschig, an anesthesiology researcher who has published more than 160 articles, which have collectively been cited nearly 8,000 times. In 2016, Eltzschig left Denver for the McGovern Medical School (part of The University of Texas Health Science Center at Houston), where he became the first to hold a McGovern chair position. A press release announcing his appointment calls him:

The “Number One” physician scientist in the field of perioperative medicine

We contacted Eltzschig; a representative responded and referred us to the spokesperson at the University of Colorado Denver.


Although the first allegations about the JCI paper appeared in December 2013, the following month another complainant contacted Lakin, alleging additional errors in four papers Eltzschig helped write, including three by Grenz. In February 2014, an inquiry committee determined a full investigation was warranted.

The investigation committee, along with Lakin, met 18 times, and interviewed 10 people. They read interview transcripts, laboratory notebooks, computer files and other aspects relating to the five papers.

The committee concluded that the five papers contained 36 duplicated histology images. But during the investigations, they discovered additional problems, including with the now-retracted JCI paper. Specifically, they found:

The respondents revised many figure panels with altered data that changed mean values and error bars, in 21 graphs presented in the JCI 2012 paper without informing the scientific reviewers, journal editors, and coauthors after the review process had commenced on June 28, 2011, following the submission of the manuscript by [name redacted]. These changes were not asked for by the reviewers after their initial critique of the manuscript. In addition, a pair of western blots for 2 equilibrative nucleoside transporters (ENT1 and 2) were switched prior to the original submission of the JCI paper and differ from their public presentation at several poster sessions. The switched protein bands were substituted after the final manuscript was sent to the coauthors for comments but prior to submitting the original manuscript to the JCI.

The report notes:

There does not seem to be a clear rationale for making the changes between versions but a number of the changes do serve to better illustrate the hypothesis of the paper.

Although many names in the report — including those of the complainants, respondents, and committee members — are redacted, in a handful of cases, the report makes its conclusions clear:

The committee finds that Dr. Grenz committed research misconduct in relation to the 21 figures detailed in section 3A above.

The report also notes:

…the committee heard testimony from a number of former members of the laboratory describing a strained work environment with pressure to produce data that conformed to the Principal Investigator’s [redacted] general hypothesis.

The hypothesis of the JCI paper, according to the abstract, is:

These studies identify ENT1 and adenosine receptors as key to the process of reestablishing renal perfusion following ischemic AKI. If translatable from mice to humans, these data have important therapeutic implications.

The university spokesperson told us she was “unaware” if Eltzschig had any commercial interest in the development of ENT1-based therapies for ischemia.


Another paper that was found to contain additional problems was published in Hepatology in 2013; Eltzschig and Grenz are co-corresponding authors. In that paper, the committee found the mean value error bars were changed in 36 conditions between the original and final versions of the paper, and 23 changes to p-values. In this case, the committee found the changes stemmed from “a case of careless misuse of error bar calculations.”

It recommended the Hepatology paper be retracted, as well. Chris Graf, the Director of Research Integrity and Publishing Ethics at Wiley, which publishes the journal, told us it had not yet received a request from the institution or author to publish a retraction.

“Equilibrative nucleoside transporter (ENT)-1-dependent elevation of extracellular adenosine protects the liver during ischemia and reperfusion” has been cited 15 times since it was published in 2013.

The other affected papers are:

Signaling through hepatocellular A2B adenosine receptors dampens ischemia and reperfusion injury of the liver,” PNAS 2013, cited 17 times. Recommended for correction.

Adora2b Adenosine Receptor Signaling Protects during Acute Kidney Injury via Inhibition of Neutrophil-Dependent TNF-α Release,” Journal of Immunology 2012, cited 22 times. Recommended for correction or retraction.

Hypoxia-inducible factor–dependent induction of netrin-1 dampens inflammation caused by hypoxia,” Nature Immunology 2009. Cited 208 times. Grenz is not a co-author; Eltzschig is the last author. The report notes that the paper “was not under the jurisdiction of this committee as all the data was collected external to the University of Colorado Denver.” What’s more, the paper was corrected in 2015, noting:

In the version of this article initially published, the contrast in lane 4 of Figure 2c had been altered, and the top right image in Figure 5a and bottom right image Figure 6e were incorrect. The correct gel and images are now presented. The error has been corrected in the HTML and PDF versions of the article.

When the spokesperson sent us the redacted report, she included this statement:

The University of Colorado Anschutz Medical Campus is committed to ensuring the integrity of research and takes scientific misconduct allegations seriously. After concerns about research misconduct were raised, the university conducted an investigation in accordance with federal mandates. At the conclusion of that investigation, it was determined that Almut Grenz falsified data while employed as a researcher in the Organ Protection Laboratory in the Department of Anesthesiology. Affected publications, co-authors and funding agencies have been notified. The university remains vigilant in fostering an environment that promotes the responsible conduct of research and delivers an exceptional educational experience to our students.

Update, 20:37 UTC time, June 19, 2017: The PNAS and Journal of Immunology papers have been retracted. Here is the PNAS notice:

The authors wish to note: “We were informed by the Office of Research Integrity of the University of Colorado of the inappropriate duplication of several histological images in Figs. 2 A and D, 3 AC, S2B, and S3B of our recent PNAS paper. There were no findings of scientific misconduct made against any of the authors. The problems with the histologic slides appear to be due to honest errors. We apologize to our colleagues and the scientific community for any inconvenience this might have caused. Based on these concerns, we request to retract our paper.”

Here is a link to the notice from the Journal of Immunology retraction of “Adora2b Adenosine Receptor Signaling Protects during Acute Kidney Injury via Inhibition of Neutrophil-Dependent TNF-α Release:”

A request was received from the Research Integrity Officer of the University of Colorado Denver, Anschutz Medical Campus, and by Dr. Clambey, to retract this article: “Adora2b Adenosine Receptor Signaling Protects during Acute Kidney Injury via Inhibition of Neutrophil-Dependent TNF-α Release” by Almut Grenz, Jae-Hwan Kim, Jessica D. Bauerle, Eunyoung Tak, Holger K. Eltzschig, and Eric T. Clambey, The Journal of Immunology, 2012, 189: 4566–4573.

The Editor-in-Chief of The Journal of Immunology was informed that the University of Colorado Denver had conducted a review of the work and concluded that data used for the upper right hand panel of Figure 3B (−Infliximab +Ischemia in a homozygous Adora2b−/− mouse) was duplicated with the upper right hand panel of Figure 3E (−Infliximab +Ischemia in a WT mouse). The authors were not able to provide the original data for these figures, and thus they cannot be validated. There were no findings of scientific misconduct made against any of the coauthors relating to the article. The identified errors appear to be the result of honest error, but due to the lack of original data, the article is hereby retracted.

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  • Saeed Doroudiani June 19, 2017 at 11:53 am

    Such a scenario is not rare in academia, as I have seen in few occasions. The “lab” makes a “novel” claim and hypothesis, then they fabricate a series of papers with graphs and data supporting the initial hypothesis. Who cares! It should not end by allowing the cheater leaving the university and just retraction of the paper. It is very likely that such academic cheaters have supports from the university authorities (department chair, dean, et al.) Who are behind the cheater? The investigation must be extended to the past and the hiring process of the cheater, their references and supporters and even their studies and research in PhD program. The cheating might have been the routine conduct of such people even when they were student. It is not acceptable to let them go to another place; a thorough investigation is needed. the outcome of the investigation must be open to the academic community and public at large.

    • Jim June 22, 2017 at 10:04 am

      I truly wonder if the University of Texas is even aware of this investigation?? If I were a Dean or Chair I would never hire anyone with even a minor hint of misconduct let alone a major investigation that led to retraction, findings of misconduct, and contract termination! In science researchers pursue “truth” so the very second that an individual violates the trust of society and the scientific community, that person needs to be removed from the field. How can credibility be restored? A cloud of doubt will always hang over that person!

  • Michael June 19, 2017 at 5:16 pm

    From the UCD investigation report: “The use of placeholders was prevalent in the laboratory and reinforced by the PI, [redacted]. The practice went further with the PI requesting graphics representing the anticipated data set based upon the existing hypothesis. Former members of the laboratory testified that in future conversations with the research team, [redacted] would not remember or identify that this data was merely a placeholder and put pressure on them to leave the placeholder data in the manuscript.”
    Wow, this kind of environment practically begs for research misconduct. Certainly would be nice to know who PI refers to in this case….

  • Christina Merchant June 19, 2017 at 5:22 pm

    NO MAJOR REPERCUSSIONS – OR AT LEAST NONE THAT MATTER! Eltzschig, the lab chief, went to another institution where he is showered with more $$$ and maintains his NIH funding which likely was a result of at least some of these questionable publications. And Grenz, likely same scenario.

  • Morty June 19, 2017 at 5:33 pm

    Why are the report censored?! Why spend so much time acting as a former DDR officer to hide information? The only reason I see for this that the institution is afraid of loosing their part of the grants.

    We need full openness in these cases, and I really don’t understand why research institutions like the University of Colorado Denver is hiding important information here.

    I also think the committee is naive and all to soft in their conclusions. Why not ask for retraction of all the papers that have important errors, like the J. Immunology and PNAS paper? Working late at night is just irrelevant, and it only add to the believe that it is hard to trust the data in general. Are there any trust left in a researcher that has been found guilty of falsification and manipulation at that level?

    E.g. a micrograph in the PNAS paper is rotated 180 degrees, cropped differently and used again. They call it honest error:

    The PNAS and J Immunology papers are only 4-5 years old and the authors should have stored all necessary raw data to support their conclusions. If they cannot present these data the papers must be retracted.

    There are also additional cases:

  • Josiah Parkins June 19, 2017 at 6:04 pm

    Dr Grenz is doing well at University of Tuebingen, thank you. She is listed in NIH Reporter as the Director of a “Transgenic Core Breeding Facility” which is part of a Program Project Grant funded by NIH with Eltzschig as PI. Nice! I think I’ll go elsewhere for my transgenic mice needs.

    • Michael June 19, 2017 at 6:34 pm

      I don’t see any current affiliation with the University of Tuebingen though she did obtain a medical degree there 10 years ago. Certainly odd that she is still listed as a contact PI for the Breeding Core, which moved to Texas (along with Eltzschig).

      • Josiah parkins June 22, 2017 at 9:44 am

        I stand corrected about current affiliations. The NIH should however revoke all funds associated with the guilty parties, and take a deep look into all grants awarded that were based on any of the suspect data or in which any of the retracted articles were used as “proof of productivity” Alas. Not holding my breath. NIH is largely a toothless tiger.

  • Michael June 19, 2017 at 10:50 pm

    Thanks to the RW staff for bringing this out in the open. It might be worth at some point to have a little primer on requests of public records, and how specific they need to be. In this particular case, I assume you were alerted to the existence of a UCD investigation by the JCI retraction notice. It seems that puts a lot of importance on how retraction notices are phrased, or otherwise these shenanigans never come to light.

  • fernandopessoa June 21, 2017 at 2:11 pm

    Second retraction.
    Adora2b Adenosine Receptor Signaling Protects during Acute Kidney Injury via Inhibition of Neutrophil-Dependent TNF-α Release
    Almut Grenz, Jae-Hwan Kim, Jessica D. Bauerle, Eunyoung Tak, Holger K. Eltzschig and Eric T. Clambey
    J Immunol November 1, 2012, 189 (9) 4566-4573; DOI:

    2017 retraction notice.

  • Jim June 22, 2017 at 10:05 am

    in light of the information detailed above, how do you all feel about this press release?

    • Volga Tronovic June 22, 2017 at 10:39 am

      Unfortunately, I have seen it many times before. People like that will continue to get money and fame because they are good salesmen. It reflects on our society’s (and profession’s) value system. However, the product they are selling will now forever be tarnished.

    • Michael June 22, 2017 at 5:10 pm

      It would be nice to know if the McGovern leadership was aware of the UCD report by the time the offer to Eltzschig was made (probably sometime early in 2016). One would think any hire of this magnitude would be subject to extreme scrutiny but in times where PIs with multiple R01 are at an extreme premium, there might be too much incentive to overlook potential issues…

  • fernandopessoa August 23, 2017 at 4:31 am

    3rd retraction. 2017 retraction of J Immunol. 2011 Apr 1;186(7):4367-74. doi: 10.4049/jimmunol.0903617. Epub 2011 Feb 28.
    Hypoxia-inducible factor-1α-dependent protection from intestinal ischemia/reperfusion injury involves ecto-5′-nucleotidase (CD73) and the A2B adenosine receptor.

    Hart ML1, Grenz A, Gorzolla IC, Schittenhelm J, Dalton JH, Eltzschig HK.
    Author information
    Department of Anesthesiology and Critical Care Medicine, Tübingen University Hospital, D-72074 Tübingen, Germany.

    2017 retraction notice.

  • Jeff September 14, 2017 at 10:02 am

    so what?? they have earned tons of money (salary and grant)…and taken the position that they were not qualified if without these fabricated papers…. look like the system often punishes the people who are honest.. Don’t know if the system would ask them to pay back money and fine

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