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12 May 2022 MTOR-mediated interaction between the oocyte and granulosa cells regulates the development and function of both compartments in mice
You-Qiang Su, Yaoxue Yin, Jing Guo, Xuhong Gong, Yufeng Tian, Lanying Shi
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Abstract

Coordinated development of the germline and the somatic compartments within a follicle is an essential prerequisite for creating a functionally normal oocyte. Bi-directional communication between the oocyte and the granulosa cells enables the frequent interchange of metabolites and signals that support the development and functions of both compartments. Mechanistic target of rapamycin (MTOR), a conserved serine/threonine kinase and a widely recognized integrator of signals and pathways key for cellular metabolism, proliferation, and differentiation, is emerging as a major player that regulates many facets of oocyte and follicle development. Here, we summarized our recent observations on the role of oocyte- and granulosa cell-expressed MTOR in the control of the oocyte's and granulosa cell's own development, as well as the development of one another, and provided new data that further strengthen the role of cumulus cell-expressed MTOR in synchronizing oocyte and follicle development. Inhibition of MTOR induced oocyte meiotic resumption in cultured large antral follicles, as well as cumulus expansion and the expression of cumulus expansion-related transcripts in cumulus-oocyte complexes in vitro. In vivo, the activity of MTOR in cumulus cells was diminished remarkably by 4 h after hCG administration. These results thus suggest that activation of MTOR in cumulus cells contributes to the maintenance of oocyte meiotic arrest before the LH surge. Based on the observations made by us here and previously, we propose that MTOR is an essential mediator of the bi-directional communication between the oocyte and granulosa cells that regulates the development and function of both compartments.

Summary Sentence

Crosstalk mediated by mechanistic target of Rapamycin kinase between oocytes and granulosa cells is crucial for the maintenance of oocyte meiotic arrest and granulosa cell identity, promotion of oocyte competence and cumulus cell survival.

Graphical Abstract

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© The Author(s) 2022. Published by Oxford University Press on behalf of Society for the Study of Reproduction. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com
You-Qiang Su, Yaoxue Yin, Jing Guo, Xuhong Gong, Yufeng Tian, and Lanying Shi "MTOR-mediated interaction between the oocyte and granulosa cells regulates the development and function of both compartments in mice," Biology of Reproduction 107(1), 76-84, (12 May 2022). https://doi.org/10.1093/biolre/ioac099
Received: 3 February 2022; Accepted: 6 May 2022; Published: 12 May 2022
JOURNAL ARTICLE
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KEYWORDS
Apoptosis
cumulus cell
female fertility
granulosa cell
meiotic arrest
MTOR
oocyte maturation
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