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Capacitation-associated Changes in Protein-tyrosine-phosphorylation, Hyperactivation and Acrosome Reaction in Guinea Pig Sperm

  • Kong, Li-Juan (College of Animal Science, Nanjing Agricultural University) ;
  • Shao, Bo (Dongtai People's Hospital) ;
  • Wang, Gen-Lin (College of Animal Science, Nanjing Agricultural University) ;
  • Dai, Ting-Ting (College of Animal Science, Nanjing Agricultural University) ;
  • Xu, Lu (College of Animal Science, Nanjing Agricultural University) ;
  • Huang, Jing-Yan (College of Animal Science, Nanjing Agricultural University)
  • 투고 : 2007.04.17
  • 심사 : 2007.07.30
  • 발행 : 2008.02.01

초록

The aim of this study was to evaluate the effects of $Ca^{2+}$, $HCO_3{^-}$ and BSA on the in vitro capacitation-associated protein tyrosine phosphorylation, hyperactivation and acrosome reaction in guinea pig sperm. Caudal epididymal sperm were incubated in four different groups: modified TALP (Tyrode's albumin lactate pyruvate) or TALP without one of the medium constituents ($Ca^{2+}$, $HCO_3{^-}$ and BSA). After incubation for the required time (0 h, 0.5 h, 1 h, 3 h, 5 h, and 7 h), sperm were removed for further experiment. The capacitation effect was assessed by CTC (Chlortetracycline) staining. Western blotting and indirect immunofluorescence were used to analyze the level and localization of tyrosine phosphorylation. The results showed that guinea pig sperm underwent a time-dependent increase in protein tyrosine phosphorylation during the in vitro capacitation and the percentage of protein tyrosine phosphorylated sperm increased from 36% to 92% from the beginning of incubation to 7 h incubation. Also, there was a shift in the site of phosphotyrosine-specific fluorescence from the head of sperm to both the head and the flagellum. Moreover, an absence of $Ca^{2+}$ or $HCO_3{^-}$ inhibited in vitro hyperactivation and acrosome reaction and decreased the phosphorylation of the proteins throughout the period of in vitro capacitation. However, an absence of BSA could not influence these processes if substituted by polyvinyl alcohol (PVA) in the medium.

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