Body mass index in relation to extracellular vesicle–linked microRNAs in human follicular fluid

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Authors:

Rosie M. Martinez, Sc.D., M.P.H., Andrea A. Baccarelli, M.D., Ph.D., Liming Liang, Ph.D., Laura Dioni, Ph.D., Abdallah Mansur, M.S., Michal Adir, Bs.C., Valentina Bollati, M.D., Catherine Racowsky, Ph.D., Russ Hauser, M.D., Sc.D., Ronit Machtinger, M.D.

Abstract:

Objective

To study whether increased body mass index is associated with altered expression of extracellular vesicle microRNAs (EV-linked miRNAs) in human follicular fluid.

Design

Cross-sectional study.

Setting

Tertiary-care university-affiliated center.

Patient(s)

One hundred thirty-three women undergoing in vitro fertilization (IVF) were recruited from January 2014 to August 2016.

Interventions(s)

None.

Main Outcome Measure(s)

EV-linked miRNAs were isolated from follicular fluid and their expression profiles were measured with the use of the Taqman Open Array Human miRNA panel. EV-linked miRNAs were globally normalized and inverse-normal transformed. Associations between body mass index (BMI) and EV-linked miRNA outcomes were analyzed by means of multivariate linear regression and principal component analysis.

Result(s)

Eighteen EV-linked miRNAs were associated with an increase in BMI after adjusting for age, ethnicity, smoking status, and batch effects. Hsa-miR-328 remained significant after false discovery rate adjustments. Principal component analyses identified the first principal component to account for 40% of the variation in our EV-linked miRNA dataset, and adjusted linear regression found that the first principal component was significantly associated with BMI after multiple testing adjustments. Using Kyoto Encyclopedia of Genes and Genomes enrichment analyses, we predicted gene targets of EV-linked miRNA in silico and identified PI3K-Akt signaling, ECM-receptor interaction, focal adhesion, FoxO signaling, and oocyte meiosis pathways.

Conclusion(s)

These results show that a 1-unit increase in BMI is associated with altered follicular fluid expression of EV-linked miRNAs that may influence follicular and oocyte developmental pathways. Our findings provide potential insight into a mechanistic explanation for the reduced fertility rates associated with increased BMI.


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Fertility and Sterility

Editorial Office, American Society for Reproductive Medicine

Fertility and Sterility® is an international journal for obstetricians, gynecologists, reproductive endocrinologists, urologists, basic scientists and others who treat and investigate problems of infertility and human reproductive disorders. The journal publishes juried original scientific articles in clinical and laboratory research relevant to reproductive endocrinology, urology, andrology, physiology, immunology, genetics, contraception, and menopause. Fertility and Sterility® encourages and supports meaningful basic and clinical research, and facilitates and promotes excellence in professional education, in the field of reproductive medicine.

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