Abstract
In sturgeon, the acquisition of the potential for motility activation called spermatozoon maturation takes place outside testes. This process can be accomplished in vitro by pre-incubation of immature testicular spermatozoa in seminal fluid collected from fully mature Wolffian duct sperm. Addition of trypsin inhibitor to the pre-incubation medium disrupts spermatozoon maturation. There are no available data for the role of proteolysis regulators in fish spermatozoon maturation, while their role is recognized in mammalian sperm maturation. The present study evaluated the involvement of seminal fluid proteases and anti-proteolytic activity in the sterlet spermatozoon maturation process. Casein and gelatin zymography and quantification of amidase and anti-proteolytic activity were conducted in sturgeon seminal fluid from Wolffian duct sperm and seminal fluid from testicular sperm, along with spermatozoon extracts from Wolffian duct spermatozoa, testicular spermatozoa, and testicular spermatozoa after in vitro maturation. We did not find significant differences in proteolytic profiles of seminal fluids from Wolffian duct sperm and ones from testicular sperm. Zymography revealed differences in spermatozoon extracts: Wolffian duct spermatozoon extracts were characterized by the presence of a broad proteolytic band ranging from 48 to 41 kDa, while testicular spermatozoon extracts did not show such activity until after in vitro maturation. The differences in amidase activity coincided with these results. It may not be the levels of proteolytic and anti-proteolytic activity per se, but the alterations in their interactions triggering a cascade of signaling events, that is crucial to the maturation process.
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Acknowledgments
The study was financially supported by the Ministry of Education, Youth and Sports of the Czech Republic—projects ‘CENAKVA’ (No. CZ.1.05/2.1.00/01.0024), ‘CENAKVA II’ (No. LO1205 under the NPU I program) and COST (No. LD14119), by the Grant Agency of the University of South Bohemia in Ceske Budejovice (No. 114/2013/Z) and by the Czech Science Foundation (No. P502/15-12034S). This publication was also supported by the project Postdok_BIOGLOBE (CZ.1.07/2.3.00/30.0032) co-financed by the European Social Fund and the state budget of the Czech Republic. Zymetech Company, Iceland, is gratefully acknowledged for the provision of cod trypsin. Authors appreciate very much Piter Gross and Udo Gross (Germany), and their colleagues for fish provided for the experiments. We greatly appreciate Dr. William L. Shelton for his valuable comments and help with editing the manuscript. The Lucidus Consultancy, UK, is gratefully acknowledged for the English correction and suggestions.
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Dzyuba, V., Słowińska, M., Cosson, J. et al. Characterization of proteolytic and anti-proteolytic activity involvement in sterlet spermatozoon maturation. Fish Physiol Biochem 42, 1755–1766 (2016). https://doi.org/10.1007/s10695-016-0255-x
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DOI: https://doi.org/10.1007/s10695-016-0255-x