Overview
- The study published July 2 in Cell Stem Cell used four different mouse stress models to trace a pathway from the brain to the gut to the bone marrow.
- Researchers found reduced activity in the medial prefrontal cortex and the periaqueductal gray sent sympathetic signals that changed intestinal signals and the gut microbiome.
- Stressed mice lost Lactobacillus reuteri and had lower levels of microbiome‑derived spermidine, a compound tied to cell maintenance and healthy aging.
- Those microbial and metabolic changes impaired hematopoietic stem cell self‑renewal and lowered lymphocyte production, and experimentally suppressing the two brain regions reproduced many defects.
- Authors stress the work is preclinical and say human relevance and safe clinical interventions—such as microbiome modulation, spermidine restoration, neural targeting, or stress reduction—will require further study.