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玻璃化冷冻前添加胆固醇对未成熟和体外成熟牛卵母细胞抗冻性的影响。

Cholesterol added prior to vitrification on the cryotolerance of immature and in vitro matured bovine oocytes.

作者信息

Arcarons Núria, Morató Roser, Vendrell Meritxell, Yeste Marc, López-Bejar Manel, Rajapaksha Kosala, Anzar Muhammad, Mogas Teresa

机构信息

Department of Animal Medicine and Surgery, University Autonomous of Barcelona, Cerdanyola del Vallès, Spain.

Department of Animal Health and Anatomy, University Autonomous of Barcelona, Cerdanyola del Vallès, Spain.

出版信息

PLoS One. 2017 Sep 14;12(9):e0184714. doi: 10.1371/journal.pone.0184714. eCollection 2017.

Abstract

This study examines whether incorporating cholesterol-loaded methyl-β-cyclodextrin (CLC) in the bovine oocyte plasma membrane improves oocyte tolerance to vitrification. In vitro matured oocytes were incubated with 2 mg/ml BODIPY-labeled CLC for different time intervals in FCS or PVA supplemented medium or exposed to different CLC concentrations to examine the subcellular localization of cholesterol by confocal microscopy live-cell imaging. Subsequently, the effects of optimized CLC concentrations and incubation times prior to vitrification on early embryo development were assessed. Then, we evaluated the effects of pretreatment with 2 mg/ml CLC for 30 min before the vitrification of immature (GV) and in vitro matured (MII) oocytes on developmental competence and gene expression. Our results indicate a high plasma membrane labeling intensity after 30 min of incubation with 2 mg/ml CLC for 30 min, regardless of the holding medium used. When oocytes were incubated with 1 mg/ml, 2 mg/ml and 3 mg/ml of CLC, intense labeling was observed at the plasma membrane after 40, 30 and 20 min, respectively. CLC pre-treatment before the vitrification of bovine oocytes did not affect subsequent cleavage and embryo development rates irrespective of CLC concentrations, incubation times or meiotic stage. However, pretreatment seems to improve the quality of embryos derived from vitrified oocytes, mainly when oocytes were vitrified at the GV stage.

摘要

本研究探讨在牛卵母细胞质膜中加入载胆固醇的甲基-β-环糊精(CLC)是否能提高卵母细胞对玻璃化冷冻的耐受性。将体外成熟的卵母细胞在补充有胎牛血清(FCS)或聚乙烯醇(PVA)的培养基中与2mg/ml硼二吡咯标记的CLC孵育不同时间间隔,或暴露于不同浓度的CLC中,通过共聚焦显微镜活细胞成像检查胆固醇的亚细胞定位。随后,评估玻璃化冷冻前优化的CLC浓度和孵育时间对早期胚胎发育的影响。然后,我们评估了在未成熟(GV)和体外成熟(MII)卵母细胞玻璃化冷冻前用2mg/ml CLC预处理30分钟对发育能力和基因表达的影响。我们的结果表明,无论使用何种保存培养基,在与2mg/ml CLC孵育30分钟后,质膜标记强度都很高。当卵母细胞分别与1mg/ml、2mg/ml和3mg/ml的CLC孵育时,在40分钟、30分钟和20分钟后分别在质膜上观察到强烈的标记。牛卵母细胞玻璃化冷冻前的CLC预处理,无论CLC浓度、孵育时间或减数分裂阶段如何,均不影响随后的卵裂和胚胎发育率。然而,预处理似乎能提高玻璃化冷冻卵母细胞来源胚胎的质量,主要是当卵母细胞在GV期进行玻璃化冷冻时。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/67fc/5598999/c69424befeec/pone.0184714.g001.jpg

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