Elevated non esterified fatty acid concentrations during in vitro murine follicle growth alter follicular physiology and reduce oocyte developmental competence

Long-term elevated NEFA concentrations, typical in metabolic disorders, such as obesity or type 2 diabetes, alter follicular growth and physiology, ultimately resulting in reduced oocyte developmental competence in vitro.

0
0

Authors

Sara D.M. Valckx, M.Sc., Veerle Van Hoeck, Ph.D., Maria Arias-Alvarez, Ph.D., Veronica Maillo, M.Sc., Angela P. Lopez-Cardona, M.Sc., Alfonso Gutierrez-Adan, Ph.D., Mario Berth, Ph.D., Rita Cortvrindt, M.Sc., Peter E.J. Bols, Ph.D., Jo L.M.R. Leroy, Ph.D.

Volume 102, Issue 6, Pages 1769-1776

Abstract

Objective:

To study how long-term elevated non-esterified fatty acid (NEFA) concentrations, typical in metabolic disorders such as obesity or type 2 diabetes, affect murine follicular development, follicle quality, and subsequent oocyte developmental competence in vitro.

Design:

Experimental study.

Setting:

In vitro culture setting.

Animal(s):

Female and male 13-day old, B6CBAF1 mice of proven fertility were sacrificed for harvesting ovaries and epididymal sperm, respectively.

Intervention(s):

Early secondary murine follicles were cultured in vitro in the presence of NEFAs until the antral stage (12 days). Treatments consisted of one or a mixture of NEFAs (stearic acid [SA], palmitic acid [PA], oleic acid [OA]) in physiological (basal) or pathological (high SA, high OA, high NEFA) concentrations.

Main Outcome Measure(s):

Follicular development; follicle and oocyte diameters; secretion of progesterone, estradiol, and inhibin B; and luteinized granulosa cell gene expression patterns were investigated. Oocytes from NEFA-exposed follicles were fertilized in vitro, and presumptive zygotes were cultured until the blastocyst stage.

Result(s):

Exposure to high SA reduced follicle diameters and day-12 antrum formation. Elevated NEFA concentrations changed luteinized granulosa cell messenger–ribonucleic acid abundance of genes related to energy/fatty acid/steroid metabolism, apoptosis, and oxidative stress. High NEFA and high SA treatments increased progesterone synthesis, compared with high OA follicles. Oocyte developmental competence was substantially reduced in oocytes retrieved from high OA–, high SA–, and high NEFA–exposed follicles compared with basal–treated follicles.

Conclusion(s):

This study showed, for the first time, that lipolysis-linked, elevated NEFA concentrations can potentially impair fertility, by altering follicular physiology and reducing oocyte developmental competence.

Read the full text at: http://www.fertstert.org/article/S0015-0282(14)02077-9/fulltext


Go to the profile of Fertility and Sterility

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.

No comments yet.