The aim of this study was to identify the biological characteristics and functions of a putative Trichinella spiralis glutathione S-transferase (TspGST). The results of real-time PCR and immunofluorescent test (IFT) showed that the TspGST gene was expressed at all of T. spiralis different developmental stages (muscle larvae, intestinal infective larvae, adult worms and newborn larvae). When anti-rTspGST serum, mouse infection serum, and pre-immune serum were added to the medium, the inhibition rate of the larvae penetrated into the intestinal epithelial cells (IECs) was 25.72%, 49.55%, and 4.51%, respectively (P < 0.01). The inhibition of anti-rTspGST serum on larval invasion of IECs was dose-dependent (P < 0.05). Anti-rTspGST antibodies killed T. spiralis newborn larvae by an ADCC-mediated mechanism. Our results showed that the TspGST seemed to be an indispensable protein for T. spiralis invasion, growth and survival in host.
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