# Young Blood Restarts Liver Repair in Old Mice, Thanks to B Cells

*Restoration of aged liver regeneration by youthful systemic factors via LTβ-driven hepatocyte reprogramming.*

- **Evidence Level**: Preliminary
- **Why this grade**: Mechanistic mouse work with parabiosis and knockout models, plus a small retrospective look at 36 human transplant pairs, with no human intervention tested.
- **Facts**: Funding: The authors report no competing interests.
- **Population**: Animal study
- **Publication Types**: Journal Article
- **Journal**: Journal of hepatology
- **Sample Size**: Mice plus 36 human split liver transplant pairs
- **Authors**: Chenhao J, Lu H, Yasong L, Jianhao Z, Huaxin C, Xinyun W, Xianda C, Linda F, Tianyi L, Shaojun S, Sunrui C, Jiaqi X, Xing L, Jiebin Z, Xuegang Z, Yujun Z, Jianrong L, Xu Z, Guo L, Yuan Q, Jia Y, Kaining Z, Haibo L, Tongyu L, Linsen Y, Binsheng F, Hua L, Shuhong Y, Wei L, Qi Z, Guihua C, Jianye C, Peng XA, Yingcai Z, Xin S, Yang Y
- **Graded and published**: 2026-09-22
- **Last edited**: 2026-09-23
- **Topics**: liver health, rejuvenation, parabiosis
- **DOI**: https://doi.org/10.1016/j.jhep.2026.08.036
- **Original Source**: https://pubmed.ncbi.nlm.nih.gov/42772698/

## Summary

Old mice regrew their livers much faster after surgery when they shared blood with young mice. The driver was a signal called LTβ made by young B cells, which nudged old liver cells into a younger, repair-ready state. A drug that mimics this signal worked on its own in mice, hinting at ways to prep older livers before surgery. Human data here was only a small look at 36 transplant pairs, so no treatment has been tested in people.

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_Canonical: https://longevity-germany.com/en/research/young-blood-restarts-liver-repair-in-old-mice-thanks-to-b-cells · Part of Longevity Cities · Updated 2026-09-23_