In Vivo Reprogramming Ameliorates Aging Features in Dentate Gyrus Cells and Improves Memory in Mice.
Level 5 - mechanism / opinion, no new human data
Preclinical in vivo animal study
PubMed 33096049 · doi:10.1016/j.stemcr.2020.09.010
What was done
Researchers evaluated the effects of transient, cyclic in vivo induction of Yamanaka reprogramming factors on the central nervous system of mice. They assessed dentate gyrus post-translational epigenetic modifications (H3K9me3), levels of migrating cells expressing neurogenic markers (doublecortin and calretinin), the NMDA receptor subunit GluN2B, and memory performance using the object recognition test.
What was found
The abstract does not provide quantitative data, exact sample sizes, or statistical metrics. Qualitatively, induction of Yamanaka factors prevented age-dependent reductions in H3K9 trimethylation (H3K9me3), elevated the levels of migrating cells with doublecortin and calretinin markers, increased GluN2B levels, and improved long-term object recognition performance in mice.
Why it matters
The paper demonstrates that cyclic in vivo cellular reprogramming can mitigate age-associated epigenetic and cellular alterations in the mammalian brain and enhance cognitive function in a rodent model.
Limits
The study is restricted entirely to animal models, limiting direct clinical translation to humans. Sample sizes (n) and numerical effect sizes are not reported in the abstract. Long-term risks associated with Yamanaka factor induction, such as oncogenesis or loss of cellular identity, are not detailed in the abstract.
Cited by
- supports Manuel Serrano published a study demonstrating that cellular reprogramming in the brains of old mice resulted in restored neurogenesis and memory.