Abstract
Liprin α3 was reported for the first time using sperm proteomics. Present study reports its localization on sperm and immunochemical characterization. Liprin α3 is identified as a 133 kDa protein in testis and epididymal protein extracts. In testis, immunohistochemical localization was seen in pachytenes, diplotenes, round spermatids whereas it was localized in the epithelial cells and luminal sperm in all the three regions of epididymis. Protein was localized in acrosome of rat sperm, which was further confirmed by sequential treatment of sperm with hypertonic solution. In the spermatogenic cells the protein was found to be located in developing acrosome as evident by its co-localization with Golgi marker. Protein was found to be developmentally regulated. In silico analysis of Liprin α3 revealed presence of the estrogen responsive elements upstream to initiation site and its regulation by estrogen was experimentally validated using a tamoxifen treated rat model. Western blot analysis of epididymosomes showed the presence of Liprin α3, indicating its involvement in trafficking of vesicle. The protein expression was seen in both mouse and human sperm indicating conserved nature and a probable role in acrosome reaction.
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Acknowledgments
The authors thank Ms. Shobha and Ms. Reshma at the confocal department of National Institute for Research in Reproductive Health for their assistance in image acquisition and processing. The authors also wish to thank Dr. Rahul Gajabhiye, clinician for providing semen samples from normal individuals. Financial support for implementation of this project and award of junior research fellowship to one of us (CJ) from the Department of Science and Technology, New Delhi is gratefully acknowledged.
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Joshi, C.S., Suryawanshi, A.R., Khan, S.A. et al. Liprin α3: a putative estrogen regulated acrosomal protein. Histochem Cell Biol 139, 535–548 (2013). https://doi.org/10.1007/s00418-012-1044-y
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DOI: https://doi.org/10.1007/s00418-012-1044-y