Longevity & Aging
partial reprogramming (OSK) improves youthful cellular function
In plain terms: Can resetting cells make tissues young again?
Part of: 🩺 partial reprogramming (osk)
Yes, but only shown in animals so far, with zero human data and real tumor-risk concerns.
📅 Last reviewed: 2026-07-14 ⓘ
Evidence ladder
How far up the ladder this claim has climbed. A high consensus on a low rung means "consistent so far," not "proven in people."
Top evidence so far: Animal studies (Animal)
How the studies fall
What the evidence shows
Mouse landmark, independently replicated in physiologically aged wild-type mice (Browder 2022). Mouse-only; teratoma / identity-loss risk if expression is unchecked. Zero human data.
The evidence (16)
| Source | Grade | Stance | Quality | Finding |
|---|---|---|---|---|
| Paine PT 2024 · Aging Cell | observational | supports | moderate | Review of partial reprogramming as rejuvenation tech: striking mouse benefits but cell-identity-loss/tumor risks, no human data |
| Browder 2022 · Nat Aging | animal | supports | moderate | [FT-verified] Browder 2022 NatAging partial reprog rejuvenates kidney/skin physiologically-aged WT mice. ANIMAL-ONLY |
| Yang JH 2023 · Aging (Albany) | in-vitro | supports | low | Chemical cocktails mimic OSK to reverse cellular-aging markers and restore youthful transcriptome in human cells; non-genetic route |
| Macip 2024 · Cellular Reprogramming | animal | supports | low | Gene-therapy OSK partial reprogramming extends lifespan and reverses age-related changes in aged wild-type mice; replication, mouse-only |
| Jones 2023 · J Physiol | animal | supports | moderate | Muscle-specific in-vivo OKSM reprogramming shares a molecular signature with exercise adaptation in aged mouse skeletal muscle |
| Teefy 2023 · Cell Metabolism | animal | mixed | high | Commentary on ICE model: DSB/repair cycles phenocopy aging, but whether loss of epigenetic info is causal remains unproven |
| Ocampo 2016 · Cell | animal | supports | moderate | [FT-verified] Ocampo 2016 Cell OSKM ameliorates aging+extends lifespan progeroid mice. ANIMAL/MECHANISM-ONLY |
| Doeser 2018 · Stem Cells | animal | supports | moderate | Transient in-vivo partial reprogramming reduces fibrosis/scar formation while avoiding teratoma; functional benefit in mice |
| deLazaro 2019 · Mol Ther | animal | supports | moderate | Non-viral transient OKSM in mouse skeletal muscle enhances regeneration tumor-free; transient expression avoids tumorigenesis |
| Horvath S 2025 · Geroscience | animal | supports | moderate | OSKM gene therapy in 25-month-old rats (39 days, hippocampus): improved spatial memory and partially reversed age-related hippocampal DNA-methylation aging — new in-vivo evidence partial reprogramming restores a youthful FUNCTION (cognition). Animal. |
| Wang P 2025 · Adv Sci (Weinh) | animal | supports | moderate | Pulsed partial reprogramming in senescent Schwann cells reset stress-granule/proteostasis homeostasis and enhanced peripheral nerve function — additional in-vivo support that partial reprogramming restores youthful cell function (animal). |
| Schoenfeldt L 2025 · EMBO Mol Med | in-vitro | supports | moderate | Chemical reprogramming ameliorates aging hallmarks and extends lifespan; independent support for reprogramming-based rejuvenation |
| Hu 2023 · Cellular Reprogramming | animal | supports | low | Highlights safer endogenous Oct4 (CRISPR/dCas9) activation rejuvenates cells and extends progeria-mouse lifespan vs risky OSKM |
| Lu 2020 · Nature | animal | supports | moderate | OSK (Myc omitted) reprogramming improves tissue function in mice; demonstrates reversibility but mouse-only |
| Chondronasiou 2022 · Aging Cell | animal | supports | moderate | Single transient OSKM cycle drives multi-omic rejuvenation of naturally aged mouse tissues without changing cell identity |
| Griscelli 2012 · Am J Pathol | in-vitro | contradicts | moderate | Partially reprogrammed human iPSCs form malignant germ-cell-like tumors on differentiation; flags tumorigenic safety risk |
Disagree, or know a study we missed?
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Educational only, not medical advice. Grades and scores reflect published evidence weighted by study design and quality; see the methodology.