Study summary · research use only
Epitalon-activated telomerase enhance bovine oocyte maturation rate and post-thawed embryo development
Plain-language summary
Paraphrased from the published abstract below — not a verdict on whether anything works.
This study, conducted in bovine cumulus-oocyte complexes and embryos, examined telomerase expression and used Epitalon, a tetrapeptide with the amino acid sequence Ala-Glut-Asp-Gly, to activate telomerase. Immunofluorescence showed nuclear telomerase localization in healthy cumulus-oocyte complexes versus cytoplasmic localization and reduced levels in degraded complexes. Epitalon treatment was associated with a significant improvement in oocyte maturation rate compared with control (p < 0.05), and in post-thawed embryos, where telomerase activity was compromised, Epitalon treatment was associated with significantly improved blastocyst hatching rate and implantation potential (p < 0.05). The authors describe these findings as suggesting telomerase activation via Epitalon improves bovine in vitro embryo production.
Abstract
Telomerase is highly expressed in oocyte cumulus cells and plays a significant role in follicular development and oocyte maturation. In this study, we hypothesized that in vitro culture conditions may affect telomerase activity during in vitro embryo production (IVP) and that its activation may improve embryo quality. We first examined telomerase protein levels and localization in bovine cumulus-oocyte complexes via immunofluorescence assays. The results showed that healthy cumulus-oocyte complexes have the nuclear localization of the telomerase while the degraded cumulus-oocyte complex had reduced telomerase levels and that telomerase was localized in the cytoplasm. We activated telomerase via Epitalon, a tetrapeptide with the amino acid sequence Ala-Glut-Asp-Gly. We observed a significant improvement in the oocyte maturation rate compared with the control group (p < 0.05). Furthermore, telomerase activity was significantly compromised in post-thawed embryos, and Epitalon treatment significantly improved blastocyst hatching rate and implantation potential (p < 0.05). Moreover, we performed qPCR, reactive oxygen species, and JC-1 (ΔΨm) assays to evaluate the effect of Epitalon on the health of in vitro mature oocytes, cumulus cells, and post-thawed blastocysts, and the result showed that Epitalon highly enhances the quality and health of the oocyte, cumulus cell, and post-thawed blastocyst. Our results suggest that telomerase activation via Epitalon improves bovine in vitro embryo production.
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