Assertion Supported AI assessment confidence: 95% certainty 4/5 debate potential 2/5

Johns Hopkins researchers replaced heart attack scar tissue using banked stem cells

Steven Klausnitzer · 983 200 People Have Paid Him $2k To Live Forever · Apr 3, 2018 · at 9:07

Forever Labs co-founder Steven Klausnitzer cites clinical research on mesenchymal stem cells repairing heart tissue to host Nathan Latka.

0:00 / 0:16exact quote · 16.0s

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“At Johns Hopkins, they took these bone marrow derived mesenchymal stem cells, that same ones we store for you. And they grew them and introduced them into the damaged area of a person's heart after they had a heart attack. And they were able to grow healthy tissue. Replace damaged scar tissue with healthy tissue.”

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The claim, plainly

Researchers at Johns Hopkins grew bone marrow-derived mesenchymal stem cells and introduced them into post-heart attack damaged heart tissue, successfully replacing scar tissue with healthy tissue.

a quote alone can be ambiguous, so this restates it with the references and context of the conversation around it resolved. AI-written; the tape below the player is the source.

Assessment

Published peer-reviewed literature confirms all elements of the claim prior to the April 2018 statement date. Researchers at the Johns Hopkins University School of Medicine (led by Dr. Joshua M. Hare, Dr. Luciano C. Amado, Dr. Steven Schulman, and colleagues) cultured bone marrow-derived mesenchymal stem cells (MSCs) and administered them into damaged heart tissue following myocardial infarction in both preclinical animal studies (published in PNAS in August 2005) and subsequent human clinical trials (initiated in April 2005; later clinical trial results published in Circulation Research in April 2014 via the PROMETHEUS trial). These studies demonstrated significant reduction in post-infarct myocardial scar size/mass (over 75% reduction in swine models and 47.5% reduction in human trial follow-ups) accompanied by the emergence of viable tissue and functional recovery.

Amado et al. (PNAS, August 2005): Johns Hopkins investigators cultured bone marrow-derived MSCs and injected them post-myocardial infarction in swine, demonstrating a reduction of left ventricular scar area from 16.0% to 3.4% (p=0.008) and regeneration of viable myocardial tissue.
Johns Hopkins Phase I Clinical Trial (April 2005) & PROMETHEUS Trial (Circulation Research, April 2014): Evaluated bone marrow-derived MSCs in patients with ischemic cardiomyopathy, demonstrating a 47.5% reduction in scar mass (p<0.0001) alongside increased viable tissue.

Checked against

[1] sciencedaily.com [2] pnas.org [3] ahajournals.org [4] pnas.org [5] pnas.org [6] sciencedaily.com [7] nih.gov [8] nih.gov

"Hare JM" "Johns Hopkins" "mesenchymal stem cells" "scar" "pigs" OR "swine" Joshua Hare Johns Hopkins mesenchymal stem cells heart scar tissue Johns Hopkins mesenchymal stem cells heart attack scar tissue "mesenchymal stem cells" "Johns Hopkins" "myocardial infarction" "scar tissue" "Am J Physiol" OR "Circulation" OR "JACC" "Osiris Therapeutics" "Johns Hopkins" "mesenchymal stem cells" "heart attack" "scar tissue"

assessed as of 2026-09-02

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Mentioned

heart attack Johns Hopkins mesenchymal stem cells

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Disclosure

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Assertion Not checkable as stated

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Johns Hopkins researchers replaced heart attack scar tissue using banked stem cells

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