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The use of a two-step removal protocol and optimized culture conditions improve development and quality of zona free mouse embryos

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Title: The use of a two-step removal protocol and optimized culture conditions improve development and quality of zona free mouse embryos
Authors: Fan, Weihong Browse this author
Homma, Misato Browse this author
Xu, Renliang Browse this author
Kunii, Hiroki Browse this author
Bai, Hanako Browse this author →KAKEN DB
Kawahara, Manabu Browse this author →KAKEN DB
Kawaguchi, Toshikazu Browse this author
Takahashi, Masashi Browse this author →KAKEN DB
Keywords: Apoptosis
Embryo development
Customized WOW
Two-step combined zona pellucida removal
Issue Date: 5-Nov-2021
Publisher: Elsevier
Journal Title: Biochemical and biophysical research communications
Volume: 577
Start Page: 116
End Page: 123
Publisher DOI: 10.1016/j.bbrc.2021.09.013
Abstract: The zona pellucida (ZP) plays an important role in both the fertilization and embryonic development. For the successful handling of early stage blastomeres for differentiation analysis, the production of identical twins or quadruplets, nuclear transfer or gene introduction requires the removal of the ZP (ZPR). Although single use of either acidic Tyrode's solution or pronase are commonly used for ZPR, long-term exposure to these agents can result in the inhibition of development with the collapse of the three-dimensional blastomere structure. Here, we demonstrate the benefits of using a two-step combined ZPR method, which relies upon a customized well-of-well (cWOW) system with smaller well size, on developmental competence and the quality of the zona free (ZF) mouse embryos. We first isolated 2-cell embryos using acid Tyrode's solution and then cultured these embryos using either commercially available or cWOW, which had a smaller microwell size. The rate of blastocyst was significantly increased by use of cWOW when compared to other culture systems. Then we evaluated the use of a two-step ZPR protocol, relying on acid Tyrode's solution and proteinase K, and subsequent culture in the cWOW system. Although acid Tyrode's solution treatment alone reduced ZPR time, blastomere morphology became wrinkled, significant decrease in blastocyst rate associated with increased number of apoptotic cells and increased expression of apoptosis-related genes were observed. Using proteinase K alone increased ZPR time and significantly decreased the blastocyst rate, but did not induce an increase in apoptotic cell number or apoptosis-related gene expression. In contrast, two-step method significantly reduced ZPR time and improved blastocyst rate by increasing the total number of cells in these wells an reducing the number of apoptotic cells in these experiments. These results suggest that the two-step ZPR protocol is beneficial for reducing the toxic effects of zona removal on ZF embryo development and quality when combined with a suitable culture system. (c) 2021 Published by Elsevier Inc.
Rights: © 2021. This manuscript version is made available under the CC-BY-NC-ND 4.0 license
Type: article (author version)
Appears in Collections:農学院・農学研究院 (Graduate School of Agriculture / Faculty of Agriculture) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 高橋 昌志

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