Národní úložiště šedé literatury Nalezeno 3 záznamů.  Hledání trvalo 0.00 vteřin. 
Enzymatic and inhibiting activity in boar epididymal fluid
Davidová, Nina ; Ren, Š. ; Liberda, J. ; Jonáková, Věra ; Maňásková-Postlerová, Pavla
Sperm maturation, represents a key step in the reproduction process. Spermatozoa, particularly the plasma membrane, are exposed to epididymal fluid (EF) components representing the natural environment essential for their post-testicular maturation. Changes in the sperm membrane proteins are influenced by proteolytic and glycosidic enzymes present in the EF. Accordingly, the occurrence of inhibitors in this reproductive organ is very important for the regulation of sperm membrane protein processing. In present study, we monitored protease and glycosidase activities, and inhibitors of metallo- and serine proteinases in boar EF. Additionally, we studied acrosin inhibitor in fluid, spermatozoa and tissue along the epididymis. We chromatographically separated boar EF into several fractions. These fractions were subjected to SDS-electrophoresis and the separated proteins were either studied by zymographic methods or transferred to nitrocellulose membranes for detection of metallo- and serine proteinases and their inhibitors, and acrosin inhibitor by specific antibody, respectively. Acrosin inhibitor was monitored also in the sperm and tissue of the boar epididymis. In boar epididymal fluid, several metallo- and serine proteinases with different molecular masses, and inhibitors of metalloproteinase MMP-9 and acrosin were found. We measured strong activity of mannosidase in this fluid. Using specific antibody, we registered the increasing signal of acrosin inhibitor from caput to cauda epididymis in the spermatozoa, fluid and also tissue. Proteinases and their inhibitors in reproductive fluids may play a significant role in reproduction processes. Especially, acrosin inhibitor in the reproductive tract inactivates prematurely released sperm acrosin and protects spermatozoa and reproductive epithelium against proteolytic degradation. High mannosidase activity in boar EF suggests evident role of mannose structures in the sperm interaction during reproductive events.
Exprese a lokalizace inhibitoru akrosinu v kančím reprodukčním traktu
Jonáková, Věra ; Davidová, Nina ; Maňásková, Pavla
Inhibitory proteinas v semenné plasmě inhibují předčasně uvolněnou spermiovou proteinasu akrosin a ochraňují tak spermie a epitel samčího a samičího traktu proti proteolyse. Akrosin inhibitor mRNA byla nalezena v epididymu, v semených vacích, prostatě a Cowperových žlazách. Nepřímou imunofluorescencí inhibitor akrosinu byl detekován v sekreční tkáni cauda epididymu, prostatě a semených vacích a v akrosomální oblasti na epididymálních a ejakulovaných spermií. Přítomnost inhibitorů proteolytických enzymů v epididymu je důležitá pro processing spermiových membránových proteinů.

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