What this means
Rats on a high-fat diet had liver repair cells that stayed weaker, even when grown in a dish. A drug aimed at mitochondria partly improved them, but this was in rats and cells, not people.
Plain-English summary written by an AI model from the abstract. The original is below.
- Who it was tested in
- Male rats and their liver cells grown in a lab dish
- Kind of research
- Research in animals or cells
The science
- Original title
- High-Fat Diet-Induced Metabolic Stress Durably Reprograms the Liver Regenerative Compartment Toward a Senescence-Like State.
- Authors
- Yamazaki M, Yamada H, Munetsuna E et al.
- Journal
- Aging cell
- Published
- Oct 16, 2026
- Study type
- Lab or animal study · indexed as animal research
- PMID
- 42885327 ↗
Abstract
Chronic metabolic stress is increasingly recognized as a driver of aging-like tissue dysfunction, but whether it durably reprograms liver regenerative cells, potentially compromising tissue maintenance and repair, remains unknown. Here, we show that high-fat diet (HFD)-induced metabolic stress promotes a persistent senescence-like state in the liver regenerative compartment. In male rats, chronic HFD feeding induced hepatic steatosis together with oxidative stress, inflammatory responses, and senescence-associated changes. Following carbon tetrachloride-induced liver injury, HFD-fed animals exhibited reduced proliferative responses. To determine whether these abnormalities were durably retained within regenerative cell populations, we established liver organoids from control and HFD-fed rats. HF-derived organoids showed reduced formation efficiency and impaired serial propagation capacity outside the original metabolic environment. Senescence-associated abnormalities, including increased senescence-associated β-galactosidase staining, reduced Lamin B1 staining, and decreased Ki67 positivity, remained detectable through Passage 3. Transcriptomic and functional analyses revealed mitochondrial dysfunction and enhanced oxidative and inflammatory responses. These organoids also exhibited enhanced lipid accumulation and inflammatory secretion following fatty acid challenge. Treatment with the mitochondria-targeted antioxidant MitoQ reduced oxidative stress and inflammatory secretion, improved oxygen consumption, and partially restored organoid formation efficiency, supporting a functional contribution of mitochondrial dysfunction to regenerative impairment. Together, these findings support a model in which chronic metabolic stress leaves persistent senescence-like dysfunction within the liver regenerative compartment, extending its consequences beyond abnormalities in mature liver tissue.
Yamazaki M, Yamada H, Munetsuna E et al. High-Fat Diet-Induced Metabolic Stress Durably Reprograms the Liver Regenerative Compartment Toward a Senescence-Like State. Aging cell. 2026. doi:10.1111/acel.70769. PMID: 42885327. https://pubmed.ncbi.nlm.nih.gov/42885327/