SAT385 Pituitary Immune Cells Regulate Gonadotrope Hormone Secretion

Disclosure: Z. Del Mundo: None. T. Nguyen: None. N. Ujagar: None. D. Nicholas: None. Polycystic ovary syndrome (PCOS) is one of the most common causes of female infertility in the US and is associated with a combination of reproductive neuroendocrine physiological changes. Previous studies have shown that PCOS patients have elevated serum C reactive peptide and lipopolysaccharide (LPS), which indicates chronic low-grade inflammation. However, it is unknown how inflammation or immune cells impact reproductive outcomes. In this project, I study how inflammation affects gonadotrope regulation of sex hormone secretion. I show that in vitro depletion of immune cells from dispersed primary mouse pituitary increases the luteinizing hormone (LH) to follicle-stimulating hormone (FSH) ratio. In contrast, immune activation through chronic LPS exposure in mice results in decreased serum LH to FSH ratio. Using single-cell RNA sequencing data from immune cell-enriched mouse pituitaries, I identified specific resident immune cell populations. These cell populations include macrophages with higher RNA expression of heat shock proteins in male mice compared to female mice suggesting inflammatory protection in males. Ongoing experiments include chronic LPS exposure in mice, where pituitary cells are immunophenotyped, sex hormone serum levels measured, and ovulation monitored. Ultimately this work will allow us to understand the contribution of inflammation to PCOS, with the hope of designing immunotherapy for PCOS. Presentation Date: Saturday, June 17, 2023