Abstract
Purpose
To determine if the inhibition of the interaction between the Hippo effector YAP or its transcriptional co-activator TAZ with the TEAD family of transcription factors is critical for the cumulus expansion–related events induced by the EGF network in cumulus-oocyte complexes (COCs).
Methods
We performed a series of experiments using immature bovine COCs subjected to an IVM protocol for up 24 h in which cumulus expansion was stimulated with EGF recombinant protein or FSH.
Results
The main results indicated that EGFR activity stimulation in bovine cumulus cells (CC) increases mRNA levels encoding the classic YAP/TAZ-TEAD target gene CTGF. To determine if important genes for cumulus expansion are transcriptional targets of YAP/TAZ-TEAD interaction in CC, COCs were then subjected to IVM in the presence of FSH with or without distinct concentrations of Verteporfin (VP; a small molecule inhibitor that interferes with YAP/TAZ binding to TEADs). COCs were then collected at 6, 12, 18, and 24 h for total RNA extraction and RT-qPCR analyses. This experiment indicated that VP inhibits in a time- and concentration-dependent manner distinct cumulus expansion and oocyte maturation–related genes, by regulating EGFR and CTGF expression in CC.
Conclusions
Taken together, the results presented herein represent considerable insight into the functional relevance of a completely novel signaling pathway underlying cumulus expansion and oocyte maturation in monovulatory species. YAP/TAZ or CTGF may represent potential targets to improve the efficiency of IVM systems, not only for monovulatory species of agricultural importance as the cow, but for human embryo production.
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Data availability
The data sets used and/or analyzed during the current study are available from the corresponding author on reasonable request. All data generated or analyzed during this study are included in this published article.
Code availability
Not applicable.
Abbreviations
- ADAM17:
-
A disintegrin and metalloproteinase 17
- AREG:
-
Amphiregulin
- CC:
-
Cumulus cells
- COCs:
-
Cumulus-oocyte complexes
- CTGF:
-
Connective tissue growth factor
- DMSO:
-
Dimethyl sulfoxide
- EGF:
-
Epidermal growth factor
- EGFR:
-
Epidermal growth factor receptor
- EREG:
-
Epiregulin
- FSH:
-
Follicle-stimulating hormone
- GC:
-
Granulosa cells
- H2AFZ:
-
Histone H2A.Z
- HAS2:
-
Hyaluronan synthase 2
- IHC:
-
Immunohistochemistry
- IVM:
-
In vitro maturation
- LH:
-
Luteinizing hormone
- PLAT:
-
Plasminogen activator tissue-type A
- PTGS2:
-
Prostaglandin endoperoxide synthase 2
- PTX3:
-
Pentraxin-related protein 3
- RPS18:
-
Ribosomal protein S18
- TAZ:
-
Transcriptional co-activator with PDZ-binding motif
- TEAD:
-
Transcriptional enhanced associate domain
- VP:
-
Verteporfin
- YAP:
-
Yes-associated protein 1
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Acknowledgements
The authors are thankful to Mrs. Camila Azzolin de Souza and Mrs. Camila Cupper for their support in this study and to Frigorífico Silva for ovaries donation.
Funding
This work was supported by Natural Sciences and Engineering Research Council of Canada (NSERC) Discovery Grant RGPIN-2018–06470 (to Dr. Zamberlam) and by fellowships from the National Council for Scientific and Technological Development (CNPq; Brazil), Coordination for the Improvement of Higher Education Personnel (CAPES; Brazil) and by the grants from Rio Grande do Sul State Research Support Foundation (FAPERGS – Edital 06/2019; 19/2551–0002275-1) & CNPq, Edital 16/2551–0000494-3; Brazil (to Dr. Gonçalves).
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J.K., V.M.P., P.B.D.G., and G.Z. were involved in the study conception and design; J.K., V.M.P., E.C., D.M., L.G.A., Z.S., and A.Q.A. performed experiments and were involved in the acquisition and analyzes of data; G.Z., P.B.D.G., and B.G.G contributed with required reagents acquisition; J.K. wrote the main manuscript text and prepared the tables and figures; G.Z. and P.B.D.G. reviewed and edited the manuscript to be published.
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All ovaries were obtained from a local slaughterhouse and in vitro procedures were approved by the Ethics and Animal Welfare Committee of the Federal University of Santa Maria, Brazil/not applicable.
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Koch, J., Portela, V.M., Dos Santos, E.C. et al. The Hippo pathway effectors YAP and TAZ interact with EGF-like signaling to regulate expansion-related events in bovine cumulus cells in vitro. J Assist Reprod Genet 39, 481–492 (2022). https://doi.org/10.1007/s10815-021-02384-x
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DOI: https://doi.org/10.1007/s10815-021-02384-x