Sara D M Valckx1, Veerle Van Hoeck2, Maria Arias-Alvarez2, Veronica Maillo3, Angela P Lopez-Cardona4, Alfonso Gutierrez-Adan3, Mario Berth5, Rita Cortvrindt6, Peter E J Bols2, Jo L M R Leroy2. 1. Gamete Research Center, Veterinary Physiology and Biochemistry, Department of Veterinary Sciences, University of Antwerp, Wilrijk, Belgium. Electronic address: sara.valckx@uantwerpen.be. 2. Gamete Research Center, Veterinary Physiology and Biochemistry, Department of Veterinary Sciences, University of Antwerp, Wilrijk, Belgium. 3. Department of Animal Reproduction, National Institute for Agricultural and Food Research and Technology (INIA), Madrid, Spain. 4. Department of Animal Reproduction, National Institute for Agricultural and Food Research and Technology (INIA), Madrid, Spain; Biogénesis, University of Antioquia, Antioquia, Colombia. 5. Algemeen Medisch Laboratorium, Antwerp, Belgium. 6. EggCentris Besloten Vennootschap met Beperkte Aansprakelijkheid, Evergem, Belgium.
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.
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.
Authors: Waleed F A Marei; Anouk Smits; Omnia Mohey-Elsaeed; Isabel Pintelon; Daisy Ginneberge; Peter E J Bols; Katrien Moerloose; Jo L M R Leroy Journal: Sci Rep Date: 2020-06-17 Impact factor: 4.379