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A Modified Co-Culture System for Understanding Granulosa-Theca Cell Interactions in the Bovine Ovary
Published on: September 19, 2025
754
Transcriptomic analysis of cyclic AMP response in bovine cumulus cells
D R Khan1, C Guillemette1, M A Sirard1
1Centre de Recherche en Biologie de la Reproduction, Département des Sciences Animales, Faculté des sciences de l'agriculture et de l'alimentation, Université Laval, Québec, Canada.
Physiological Genomics
|June 18, 2015
Summary
Stimulating cumulus cells with cyclic adenosine 3'5'-monophosphate (cAMP) agents during in vitro maturation improves oocyte quality. This cAMP signaling pathway, primarily involving protein kinase-A (PKA), optimizes key cellular functions for better developmental competence.
Area of Science:
- Reproductive Biology
- Cell Signaling
- Assisted Reproduction Technologies
Background:
- Oocyte developmental competence is crucial for successful assisted reproduction.
- Cyclic adenosine 3'5'-monophosphate (cAMP) stimulation in cumulus cells during in vitro maturation (IVM) can enhance oocyte quality.
- The precise mechanisms and downstream targets of cAMP signaling in cumulus cells remain largely unelucidated.
Purpose of the Study:
- To investigate the role and downstream signaling pathways of cAMP in cumulus cells during IVM.
- To identify key regulators of cAMP-mediated effects on oocyte developmental competence.
- To explore novel strategies for improving in vitro maturation protocols.
Main Methods:
- In vitro culture of cumulus-oocyte complexes (COCs) with cAMP-raising agents (forskolin, IBMX, dipyridamole - FID).
- Transcriptomic analysis of cumulus cells to identify differentially expressed genes.
- Functional genomic analysis to pinpoint key signaling pathways (PKA, ERK1/2, Ca2+).
- Pharmacological inhibition of PKA and manipulation of calcium signaling to dissect pathway interactions.
Main Results:
- FID treatment significantly altered gene expression related to cumulus expansion, steroidogenesis, cell metabolism, and oocyte competence.
- cAMP signaling primarily activated the protein kinase-A (PKA) pathway.
- PKA activation inhibited extracellular signal-regulated kinases (ERK1/2) phosphorylation and was upstream of calcium signaling.
- PKA-mediated inhibition of ERK1/2 phosphorylation involved dual-specificity phosphatase 1 (DUSP1).
Conclusions:
- cAMP signaling in cumulus cells, mediated by PKA, regulates crucial functions including cell metabolism, steroidogenesis, and cumulus expansion.
- PKA optimizes ERK1/2 phosphorylation and coordinates calcium signaling, thereby enhancing oocyte developmental competence.
- These findings provide a basis for developing improved IVM strategies to boost fertility outcomes.
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