Mouse and cell study links high BCAAs, reduced autophagy and decidual cell senescence to pregnancy loss
In this abstract, decidual stromal cells from women with recurrent spontaneous abortion showed more senescence in the first trimester; in cells and mice, elevated branched-chain amino acids reduced autophagy, raised HSPA6 and lowered FOXO1, and rapamycin improved pregnancy outcomes in mice under high leucine. [1]
Automatic summary · not editorially reviewed
The key findings
Senescence of decidual stromal cells was significantly increased in decidual tissue from patients with recurrent spontaneous abortion during the first trimester. [1]
In in vitro and in vivo models, abnormally elevated BCAAs reduced autophagic flux, leading to excessive decidual stromal cell senescence, involving HSPA6 upregulation and FOXO1 downregulation. [1]
In mice, leucine promoted uterine senescence and adverse pregnancy outcomes, while rapamycin restored autophagy and improved outcomes under high-leucine conditions. [1]
The source at a glance
- Study type / format
- Abstract of a study combining human tissue analysis with in vitro and mouse experiments
- Population / context
- Decidual tissue from patients with recurrent spontaneous abortion, plus in vitro and in vivo models and mice.
- Summary based on
- Study abstract
- Publication status
- Preprint · peer-review status not confirmed
- Original publication
- July 3, 2026
Senescence in decidual tissue from women with recurrent abortion
The abstract reports that senescence of decidual stromal cells was significantly increased in decidual tissue from patients with recurrent spontaneous abortion during the first trimester. This is a comparison of tissue from affected patients, not an experiment showing that senescence causes miscarriage in women. The abstract does not state how many patients were studied or how senescence was measured.
Supporting source [1]
High BCAAs, lower autophagy and the HSPA6–FOXO1 pathway in models
Using in vitro and in vivo models, the authors report that abnormally elevated branched-chain amino acids (BCAAs) reduce autophagic flux, leading to excessive decidual stromal cell senescence. They describe this as involving abnormal upregulation of heat shock protein A6 (HSPA6) and subsequent downregulation of the transcription factor forkhead box O1 (FOXO1). These are proposed mechanisms from cell and animal experiments; the abstract does not show that the same chain of events operates in human pregnancy loss.
Supporting source [1]
Leucine in mice and rapamycin restoring autophagy
In mice, intervention with leucine, a key BCAA, promoted uterine senescence and induced adverse pregnancy outcomes. Conversely, restoring autophagy with rapamycin suppressed excessive senescence at the maternal-fetal interface and significantly improved pregnancy outcomes under high-leucine conditions. These are animal findings; the abstract does not report human treatment results, doses or safety, and it does not establish rapamycin as a therapy for miscarriage.
Supporting source [1]
How to interpret this
This is an abstract only; the full text was not reviewed. Patient numbers, how senescence was measured, model details, doses and follow-up are not reported here. The human data are a tissue comparison, and the mechanistic and rapamycin findings come from cell and mouse models, so they do not establish causes or treatments for miscarriage in people.
Based on the study abstract; the full paper, tables and supplementary data were not reviewed.
Source & supporting passages
Tan H, Yang S, Shi J, Li M, Chen S, Cao X, Zhou W, Li M, Xie F. · europepmc.org · July 3, 2026