Effects of heat stress on bovine preimplantation embryos produced in vitro

The Journal of Reproduction and Development
Miki Sakatani

Abstract

Summer heat stress decreases the pregnancy rate in cattle and has been thought to be associated with the early embryonic death caused by the elevation of maternal body temperature. In vitro cultures have been widely used for the evaluation of effects of heat stress on oocytes, fertilization, preimplantation, and embryonic development. Susceptibility to heat stress is present in developmental stages from oocytes to cleavage-stage (before embryonic gene activation, EGA) embryos, leading to a consequent decrease in developmental competence. On the other hand, advanced-stage embryos such as morula or blastocysts have acquired thermotolerance. The mechanism for the developmental stage-dependent change in thermotolerance is considered to be the accumulation of antioxidants in embryos in response to heat-inducible production of reactive oxygen species. The supplementation of antioxidants to the culture media has been known to neutralize the detrimental effects of heat stress. Besides, EGA could be involved in acquisition of thermotolerance in later stages of embryos. Morulae or blastocysts can repair heat-induced unfolded proteins or prevent DNA damage occurring in processes such as apoptosis. Therefore, embryo transfer (ET) that can ...Continue Reading

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Citations

Oct 24, 2019·Reproduction, Fertility, and Development·J G Brom-de-LunaK Hinrichs
May 29, 2020·Tropical Animal Health and Production·Paulo Roberto AdonaMoysés Dos Santos Miranda
Sep 17, 2020·Tropical Animal Health and Production·Hossam El-Sheikh AliGo Kitahara
Mar 27, 2020·Frontiers in Veterinary Science·Geoffrey E DahlJimena Laporta
Feb 16, 2019·Molecular Reproduction and Development·Raffaele Boni
Nov 8, 2020·Animal Science Journal = Nihon Chikusan Gakkaihō·Hanako BaiMasashi Takahashi
May 28, 2019·Journal of Thermal Biology·Junxia SuiZhongling Jiang
Apr 20, 2021·Heliyon·Juan Sebastian Naranjo-GómezIang Schroniltgen Rondón-Barragán

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