Presence of ecto-protein tyrosine phosphatase activity is vital for survival of Setaria cervi, a bovine filarial parasite

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• 作者：Neetu Singh ; Petr Heneberg ; Sushma Rathaur
• 关键词：Setaria cervi ; Protein tyrosine phosphatase ; Microfilariae
• 刊名：Parasitology Research
• 出版年：2014
• 出版时间：October 2014
• 年：2014
• 卷：113
• 期：10
• 页码：3581-3589
• 全文大小：635 KB
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• 作者单位：Neetu Singh (1)
  Petr Heneberg (2)
  Sushma Rathaur (1)
  
  1. Banaras Hindu University, 221005, Varanasi, Uttar Pradesh, India
  2. Third Faculty of Medicine, Charles University, Prague, Ruska 87, CZ-100 00, Prague 10, Czech Republic
  
• ISSN：1432-1955

文摘

The ecto protein tyrosine phosphatases (PTP) are known to play a crucial role in the pathogenesis and survival of the intracellular parasites. However, their presence and role in filarial parasites is still unknown. We found a significant amount of tyrosine phosphatase activity in the surface antigen fraction extracted from Setaria cervi (S. cervi), a bovine filarial parasite. An antibody designed against the conserved catalytic core of human protein tyrosine phosphatases, PTP1B cross reacted with a 63?kDa band in the surface antigen. We detected a significant amount of PTP activity in the intact S. cervi adult parasites as well as microfilariae in this study for the first time. This PTP may be localized on the surface of the parasite with an exposed active site available for the external substrates. The PTP activity was also inhibited by sodium orthovanadate and phenyl arsine oxide, specific inhibitors of PTP in both the life stages. The Km and Vmax for PTP in the adult parasites and microfilariae were determined to be 2.574?±-.14?mM; 206.3?±-.75?μM Pi/h/two parasites and 5.510?±-.59?mM; 62.27?±-.27?μM Pi/h/106 parasites respectively using O-P-L-Tyrosine as substrate. Interestingly, a positive correlation was observed between the inhibition in PTP activity and reduction in the motility/ viability of the parasites when they were subjected to the specific PTP inhibitors (Orthovanadate and Phenyl arsine oxide) for 4?h in the KRB maintenance medium. The activity was also significantly inhibited in the parasites exposed to antifilarial drug/compounds for e.g. Diethylcarbamazine, Acetylsalicylic Acid and SK7, a methyl chalcone. Therefore suggesting a possible role played by PTP in the survival of the parasite, its interaction with the host as well as in the screening of newly synthesized antifilarials/drugs.