Tissue damage and senescence provide critical signals for cellular reprogramming in vivo.
Level 5 - mechanism / opinion, no new human data
Preclinical animal and laboratory study with no human data
PubMed 27884981 · doi:10.1126/science.aaf4445
What was done
Mice were induced to express the transcription factors OCT4, SOX2, KLF4, and cMYC (OSKM) in vivo. Investigators used genetic and pharmacological analyses to evaluate the relationship between OSKM-induced senescence, the Ink4a/Arf locus, interleukin-6 secretion, and in vivo cellular reprogramming during normal conditions, tissue injury, and aging.
What was found
In vivo expression of OSKM induced both cellular senescence and reprogramming in close proximity. OSKM-induced senescence required the Ink4a/Arf locus and generated a permissive tissue microenvironment for reprogramming via interleukin-6 production. Senescence-linked conditions (tissue injury and aging) enhanced in vivo reprogramming by OSKM. The abstract reports no numerical values, sample sizes, or effect sizes.
Why it matters
This work identifies senescence and tissue damage responses as critical extrinsic facilitators of in vivo cell plasticity, offering a mechanistic framework for regenerative biology and tissue repair.
Limits
The investigation was conducted exclusively in mouse models, limiting direct applicability to human clinical contexts. The abstract provides no sample sizes, quantification of reprogramming efficiency, or statistical metrics.
Cited by
- supports Senescent cells secrete factors and growth factors that can promote cell reprogramming and stimulate tissue regeneration in neighboring cells.