Atopobium vaginae advances endometrial cancer growth via macrophage function in mouse models

The female genital tract microbiome is essential for health. This study investigated the endometrial microbiota in endometrial cancer (EC) patients and explored their role in disease progression. We collected samples from patients with benign uterine conditions, endometrial hyperplasia, and EC. Microbial diversity was analyzed using 16S sequencing. The effects of <i>Atopobium vaginae</i> on macrophage phagocytosis, polarization, and EC progression were examined <i>in vitro</i> and <i>in vivo</i>. <i>Atopobium vaginae</i> was significantly upregulated in EC and hyperplasia patients, correlating with increased levels of inflammatory cytokines IL-6 and IL-10. Experiments demonstrated that <i>Atopobium vaginae</i> inhibited macrophage phagocytosis, promoted M2 polarization, and increased tumor size, thereby advancing EC progression. Our findings highlight <i>Atopobium vaginae</i> as a key factor in EC progression by regulating macrophage function and inflammatory cytokines. The study provides new insights into EC pathogenesis and reveals potential therapeutic avenues.