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https://hdl.handle.net/2440/81927
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Type: | Journal article |
Title: | Effect of epidermal growth factor-like peptides on the metabolism of in vitro matured mouse oocytes and cumulus cells |
Author: | Richani, D. Sutton-McDowall, M. Frank, L. Gilchrist, R. Thompson, J. |
Citation: | Biology of Reproduction, 2014; 90(3):49-49 |
Publisher: | Society for the Study of Reproduction |
Issue Date: | 2014 |
ISSN: | 0006-3363 1529-7268 |
Organisation: | Robinson Institute |
Statement of Responsibility: | Dulama Richani, Melanie L. Sutton-McDowall, Laura A. Frank, Robert B. Gilchrist, and Jeremy G. Thompson |
Abstract: | Oocyte in vitro maturation (IVM) is an assisted reproductive technology that involves the maturation of cumulus-oocyte-complexes (COCs) that are then capable of normal development. We have shown that epidermal growth factor (EGF)-like peptide signalling is perturbed in mouse COCs undergoing IVM when matured with FSH and/or EGF, but supplementation of IVM with EGF-like peptides amphiregulin or epiregulin improves oocyte developmental competence. Here we aimed to determine whether EGF-like peptides regulate COC metabolism. Immature 129/Sv mouse COCs underwent IVM with FSH, EGF, amphiregulin, epiregulin, betacellulin, or no treatment (control). Epiregulin significantly increased intra-oocyte FAD++ and REDOX ratio compared to FSH and control. Amphiregulin and epiregulin significantly increased the proportion of J-aggregates (from JC-1) in oocyte mitochondria compared to control, FSH or EGF, and this coupled with FAD++ and REDOX measures indicates greater mitochondrial activity. There were no differences in glucose consumption, lactate production, or glycolysis between COCs matured with FSH, EGF and EGF-like peptides. COCs matured with EGF or EGF-like peptides exhibited significantly higher mRNA expression of the hexosamine biosynthesis pathway (HBP) rate-limiting enzyme gene Gfpt2, Has2 expression, and global beta-O-linked glycosylation of proteins, compared to control or FSH, suggesting greater HBP activity. Our findings suggest that; (i) EGF-like peptides, particularly epiregulin, induce more oocyte mitochondrial activity than EGF or FSH, and (ii) EGF-like peptides and EGF induce greater HBP activity, enabling more hyaluronic acid synthesis and protein beta-O-linked glycosylation. These metabolic alterations may be a mechanism by which EGF-like peptides increase oocyte developmental competence. |
Keywords: | Cumulus cells Growth factors In vitro maturation (IVM) Metabolism Oocyte maturation |
Rights: | Copyright 2014 by The Society for the Study of Reproduction. |
DOI: | 10.1095/biolreprod.113.115311 |
Published version: | http://dx.doi.org/10.1095/biolreprod.113.115311 |
Appears in Collections: | Aurora harvest Obstetrics and Gynaecology publications |
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