Obese Women Undergoing in Vitro Fertilization Have Higher IL-6 and TNF-α Levels in Follicular Fluid [27A

Abstract

INTRODUCTION: Obesity is associated with lower pregnancy and live birth rates following in vitro fertilization (IVF). As the follicular fluid (FF) provides the microenvironment for the oocyte, immune dysregulation due to obesity related inflammation could disrupt the developing oocyte. The objective of this study was to compare differences in FF cytokines based on BMI in women undergoing IVF. METHODS: FF was collected from women undergoing IVF. Cytokines levels were measured from the FF using ELISA and compared based on BMI ≥35. Patient characteristics and cycle outcomes were compared between the groups. Wilcoxon rank sum and Fisher exact tests were used for continuous and categorical variables, respectively. Values are presented as medians. RESULTS: The analysis included 57 women with BMI <35 and 11 women with BMI ≥35. Women with BMI ≥35 had higher levels of IL-6 (129.23 vs 16.55 pg/mL, P=.019) and TNF-α (62.6 vs 9.54 pg/mL, P=.037) in the FF. Anti-müllerian hormone was lower with BMI ≥35 (2.0 vs 3.6 ng/mL, P=.049), but no other differences in patient characteristics were seen between the groups. There were no differences in stimulation duration (11 vs 11 days; P=.993), total gonadotropin (3075 vs 2475 units; P=.122), peak estradiol (2080 vs 1972 pg/mL, P=.521), mature oocytes (13 vs 12; P=.822), and oocyte maturity rate (82% vs 80%, P=.653) between the groups. CONCLUSION: Obese women undergoing IVF have higher levels of inflammatory cytokines IL-6 and TNF-α in the FF. These biochemical discrepancies may provide early insight into pathophysiologic differences in oocyte development in obese women undergoing IVF.