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BACKGROUND   Angiostrongyliasis is caused by the nematode  Angiostrongylus cantonensis  and can lead to eosinophilic meningitis and meningoencephalitis in humans. The young adult worms play central pathogenic roles in the central nervous system (CNS); however, the underlying mechanism is unclear. Excretory-secretory products (ESPs) are good investigation targets for studying the relationship between a host and its parasite.    OBJECTIVES   We aimed to profile, identify, and characterise the proteins in the ESPs of  A. cantonensis  young adults.    METHODS   The ESPs of young adult worms were collected from culture medium after incubation ranging from 24 to 96 h. Proteomic and bioinformatics analyses were performed to characterise the ESPs.    FINDINGS   A total of 51 spots were identified, and the highly expressed proteins included two protein disulphide isomerases, one calreticulin, and three uncharacterised proteins. Subsequently, approximately 254 proteins were identified in the ESPs of  A. cantonensis  young adults via liquid chromatography-mass spectrometry (LC-MS/MS) analysis, and these were further classified according to their characteristics and biological functions. Finally, we identified the immunoreactive proteins from a reference map of ESPs from  A. cantonensis  young adults. Approximately eight proteins were identified, including a protein disulphide isomerase, a putative aspartic protease, annexin, and five uncharacterised proteins. The study established and identified protein reference maps for the ESPs of  A. cantonensis  young adults.    MAIN CONCLUSIONS   The identified proteins may be potential targets for the development of diagnostic or therapeutic agents for human angiostrongyliasis.

Proteomic analysis of excretory-secretory products from young adults of Angiostrongylus cantonensis