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Exploring the role of E coli derived enzyme, oxyrase, as an oxygen scavanger to improve the cryotolerance of spermatozoa of sahiwal bull
Cryobiology ( IF 2.7 ) Pub Date : 2020-12-01 , DOI: 10.1016/j.cryobiol.2020.10.003
Athanas Alex Ngou 1 , S K Ghosh 1 , J K Prasad 1 , Rahul Katiyar 1 , Abhishek Kumar 1 , Rupali Rautela 1 , Amarjeet Bisla 1 , N Srivastava 1 , Ajay Kumar 2
Affiliation  

The current study intended to optimize the concentration of Oxyrase in the semen dilutor and to evaluate its effect on freezability of spermatozoa of Sahiwal bulls. Supplementation of Oxyrase at 0.125 IU/mL concentration significantly reduced dissolved oxygen (DO) in the dilutor to 4 ppm in 16-18 min at 35 °C. For supplementaion studies, a total of 24 eajaculates were categorized into poor and good ejaculates categories (n = 12 each) based on their initial progressive motility. Each ejaculate was further divided into two aliquotes. The first aliquote was diluted with tris-egg yolk extender without Oxyrase (control group) whereas, in the treatment group, Oxyrase was supplemented at the concentration of 0.125 IU/mL of extender. The parameters evaluated include seminal plasma cholesterol (SPC) and plasma membrane phospholipids (PMP) at fresh, while IPM, acrosomal and plasma membrane integrity, SPC, PMP and oxidative stress parameters like lipid peoxidation (LPO), total antioxidant capacity (TAC) and reactive ooxygen species (ROS) were evaluated at pre-freeze and post-thaw stages. The IPM and acrosomal intactness was higher (p < 0.05) in treatment group at post-thaw stage. Oxyrase supplementation resulted in lower (p < 0.05) cholesterol leakage in both categories and lower (p < 0.05) LPO in good ejaculates at post-thaw stage. No statistical difference in ROS was observed between control and treatment groups at all stages whereas, level of TAC was higher (p < 0.05) in the treatment group compared to control group at post-thaw stage of both categories. Therefore, Oxyrase as an Oxygen scavanging agent could preserve the post-thaw quality of Sahiwal bull spermatozoa.

中文翻译:

探索大肠杆菌衍生酶加氧酶作为氧清除剂提高萨希瓦尔公牛精子耐低温性的作用

目前的研究旨在优化精液稀释器中氧化酶的浓度,并评估其对 Sahiwal 公牛精子冷冻能力的影响。在 35 °C 下,在 16-18 分钟内,以 0.125 IU/mL 的浓度补充 Oxyrase 可显着降低稀释器中的溶解氧 (DO) 至 4 ppm。对于补充研究,共有 24 名射精者根据其初始进行性运动被分为差射精和良好射精类别(每组 n = 12)。每个射精进一步分成两个等分试样。第一个等分试样用不含氧化酶的三蛋黄补充剂稀释(对照组),而在治疗组中,氧化酶的补充浓度为 0.125 IU/mL 的补充剂。评估的参数包括新鲜时的精浆胆固醇 (SPC) 和质膜磷脂 (PMP),在冷冻前和解冻后阶段评估 IPM、顶体和质膜完整性、SPC、PMP 和氧化应激参数,如脂质过氧化 (LPO)、总抗氧化能力 (TAC) 和活性氧 (ROS)。在解冻后阶段,治疗组的 IPM 和顶体完整性更高(p < 0.05)。在解冻后阶段,补充加氧酶可降低 (p < 0.05) 两种类别的胆固醇泄漏,并降低 (p < 0.05) 良好射精中的 LPO。在所有阶段均未观察到对照组和治疗组之间的 ROS 有统计学差异,而在两组解冻后阶段,治疗组的 TAC 水平高于对照组(p < 0.05)。因此,氧化酶作为除氧剂可以保持Sahiwal公牛精子解冻后的质量。在冷冻前和解冻后阶段评估顶体和质膜完整性、SPC、PMP 和氧化应激参数,如脂质过氧化 (LPO)、总抗氧化能力 (TAC) 和活性氧 (ROS)。在解冻后阶段,治疗组的 IPM 和顶体完整性更高(p < 0.05)。在解冻后阶段,补充加氧酶可降低 (p < 0.05) 两种类别的胆固醇泄漏,并降低 (p < 0.05) 良好射精中的 LPO。在所有阶段均未观察到对照组和治疗组之间的 ROS 有统计学差异,而在两组解冻后阶段,治疗组的 TAC 水平高于对照组(p < 0.05)。因此,氧化酶作为除氧剂可以保持Sahiwal公牛精子解冻后的质量。在冷冻前和解冻后阶段评估顶体和质膜完整性、SPC、PMP 和氧化应激参数,如脂质过氧化 (LPO)、总抗氧化能力 (TAC) 和活性氧 (ROS)。在解冻后阶段,治疗组的 IPM 和顶体完整性更高(p < 0.05)。在解冻后阶段,补充加氧酶可降低 (p < 0.05) 两种类别的胆固醇泄漏,并降低 (p < 0.05) 良好射精中的 LPO。在所有阶段均未观察到对照组和治疗组之间的 ROS 有统计学差异,而在两组解冻后阶段,治疗组的 TAC 水平高于对照组(p < 0.05)。因此,氧化酶作为除氧剂可以保持Sahiwal公牛精子解冻后的质量。
更新日期:2020-12-01
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