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Type: Journal article
Title: Altered composition of the cumulus-oocyte complex matrix during in vitro maturation of oocytes
Author: Dunning, K.
Lane, M.
Brown, H.
Yeo, C.
Robker, R.
Russell, D.
Citation: Human Reproduction, 2007; 22(11):2842-2850
Publisher: Oxford Univ Press
Issue Date: 2007
ISSN: 0268-1161
Statement of
Kylie R. Dunning, Michelle Lane, Hannah M. Brown, Christine Yeo, Rebecca L. Robker and Darryl L. Russell
Abstract: BACKGROUND: In vitro maturation (IVM) of mammalian oocytes has potential health benefits for patients undergoing assisted reproduction as an alternative to gonadotrophin treatment. This procedure is also useful for studying the process of oocyte and early embryo development. However, oocytes undergoing IVM have much lower competence than in vivo matured oocytes. Efforts to optimize IVM success have focused on replicating in vivo timing, hormonal milieu and cumulus cell responses associated with maturing oocytes. We have previously identified two extracellular matrix proteins, the protease Adamts1 and hyaluronan-binding proteoglycan Versican, produced by mural granulosa cells that selectively incorporate into the periovulatory cumulus-oocyte complex (COC). METHODS: Murine COC were cultured in the presence of epidermal growth factor and/or FSH. mRNA and protein were measured by real time PCR and Western blot and compared to in vivo derived COC. RESULTS: COCs from mice that underwent IVM for 6 or 20 h in the presence of epidermal growth factor, FSH or in combination had a > 10-fold reduction in mRNA (P < 0.05) for Adamts1 and Vcan when compared with in vivo matured COCs. Hyaluronan synthase 2 expression was up-regulated up to 8-fold (P < 0.05) over the unstimulated control, demonstrating successful induction of cumulus gene expression by the IVM conditions. While in vivo matured COCs showed abundant levels of these proteins, COCs that underwent IVM had neither detectable Adamts1, nor intact or Adamts1-cleaved Vcan. Human cumulus and granulosa cells matured in vivo contained abundant mRNA for Adamts1 and Vcan, demonstrating the potential relevance to human IVM. CONCLUSION: These results indicate that extensively altered COC matrix composition is present during IVM and may contribute to the observed poorer competence of the derived oocytes.
Keywords: oocyte maturation; ovarian function; cumulus cells; mural granulosa cells; gene regulation
Description: Copyright © The Author 2007. Published by Oxford University Press on behalf of the European Society of Human Reproduction and Embryology. All rights reserved.
Provenance: Hum. Reprod. Advance Access originally published online on September 13, 2007
RMID: 0020073685
DOI: 10.1093/humrep/dem277
Appears in Collections:Obstetrics and Gynaecology publications

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