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Dalal J, Kumar P, Chandolia RK, Pawaria S, Rajendran R, Sheoran S, Andonissamy J, Kumar D. A new role for RU486 (mifepristone): it protects sperm from premature capacitation during cryopreservation in buffalo. Sci Rep 2019; 9:6712. [PMID: 31040304 PMCID: PMC6491824 DOI: 10.1038/s41598-019-43038-4] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2018] [Accepted: 04/15/2019] [Indexed: 12/19/2022] Open
Abstract
The objective of this study was to determine the mechanism by which RU 486 (mifepristone) protects sperm to undergo premature capacitation during cryopreservation. For this, semen ejaculate (n = 20) was divided into four equal fractions and diluted using egg yolk-based extender supplemented with different concentrations of RU 486 (0, 5, 10 and 20 µM) and cryopreserved. We found that RU 486 did not impair the post-thaw sperm kinetics and motility but prevented cholesterol efflux, calcium influx, and protected CatSper channels during cryopreservation. The RU 486 protected sperm from premature capacitation which was confirmed by intracellular calcium level, expression of tyrosine phosphorylated proteins (75 and 80 kDa) and CTC (chlortetracycline) assay. Furthermore, antioxidant ability of RU 486 was reflected by the ferric reducing ability, lower production of sperm malondialdehyde and intracellular reactive oxygen species. Also, we demonstrated that RU 486 treated sperm underwent normal capacitation, zona pellucida binding and zygote cleavage indicating normal fertilizing ability of sperm. In conclusion, we report a new role of RU 486 in protecting buffalo sperm from premature capacitation during cryopreservation.
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Affiliation(s)
- Jasmer Dalal
- Animal Physiology and Reproduction Division, ICAR- Central Institute for Research on Buffaloes, Hisar, 125001, Haryana, India.,Department of Veterinary Gynaecology and Obstetrics, Lala Lajpat Rai University of Veterinary and Animal Sciences, Hisar, 125001, Haryana, India
| | - Pradeep Kumar
- Animal Physiology and Reproduction Division, ICAR- Central Institute for Research on Buffaloes, Hisar, 125001, Haryana, India.
| | - R K Chandolia
- Department of Veterinary Gynaecology and Obstetrics, Lala Lajpat Rai University of Veterinary and Animal Sciences, Hisar, 125001, Haryana, India
| | - Shikha Pawaria
- Animal Physiology and Reproduction Division, ICAR- Central Institute for Research on Buffaloes, Hisar, 125001, Haryana, India
| | - Rasika Rajendran
- Animal Physiology and Reproduction Division, ICAR- Central Institute for Research on Buffaloes, Hisar, 125001, Haryana, India
| | - Suman Sheoran
- Animal Physiology and Reproduction Division, ICAR- Central Institute for Research on Buffaloes, Hisar, 125001, Haryana, India
| | - Jerome Andonissamy
- Animal Physiology and Reproduction Division, ICAR- Central Institute for Research on Buffaloes, Hisar, 125001, Haryana, India
| | - Dharmendra Kumar
- Animal Physiology and Reproduction Division, ICAR- Central Institute for Research on Buffaloes, Hisar, 125001, Haryana, India
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Pandey AN, Chaube SK. Reduction of nitric oxide level leads to spontaneous resumption of meiosis in diplotene-arrested rat oocytes cultured in vitro. Exp Biol Med (Maywood) 2014; 240:15-25. [PMID: 25092827 DOI: 10.1177/1535370214545024] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
The present study was aimed to investigate whether a decrease of nitric oxide (NO) level is beneficial for sponateous resumptiom of meiosis in diplotene-arrested oocytes cultured in vitro. For this purpose, diplotene-arrested oocytes were collected from ovary of immature female rats after a single subcutaneous injection of 20 IU pregnant mare's serum gonadotropins (PMSG) for 48 h. In vitro effects of S-nitroso-l-acetyl penicillamine (SNAP; an NO donor) and aminoguanidine (AG; an inducible NOS [iNOS] inhibitor), intracellular NO, cyclic guanosine monophosphate (cGMP), Cdc25B, Thr-14/Tyr-15 and Thr-161 phosphorylated cyclin-dependent kinase-1 (CDK1), and cyclin B1 levels were analyzed. The SNAP inhibited spontaneous meiotic resumption form diplotene arrest in a concentration-dependent manner, while AG-induced meiotic resumption form diplotene in 0.1 mmol/L 3-isobutyl-1-methylxanthine (IBMX)-treated oocytes in a concentration-dependent manner. The intracellular NO as well as cGMP levels were decreased significantly during spontaneous meiotic resumption from diplotene arrest. The reduction of Cdc25B expression level was associated with the accumulation of Thr-14/Tyr-15 phosphorylated CDK1 level. However, Thr-161 phosphorylated CDK1 as well as cyclin B1 levels were reduced significantly during meiotic resumption from diplotene arrest. Taken together, these data suggest that the inhibition of iNOS expression leads to a decrease of NO and cGMP levels thereby decreasing Cdc25B level. The reduced CDC25 B level leads to accumulation of Thr-14/Tyr-15 phosphorylated CDK1 level. As a result, Thr-161 phosphorylated CDK1 as well as cyclin B1 levels are decreased leading to maturation-promoting factor (MPF) inactivation. The inactive MPF finally induced meiotic resumption from diplotene stage in rat oocytes cultured in vitro.
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Affiliation(s)
- Ashutosh N Pandey
- Cell Physiology Laboratory, Department of Zoology, Banaras Hindu University, Varanasi 221005, India
| | - Shail K Chaube
- Cell Physiology Laboratory, Department of Zoology, Banaras Hindu University, Varanasi 221005, India
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