Cryptosporidium parvum sporozoite surface antigens (CpSAs)

Cryptosporidium parvum sporozoite surface antigens are a diverse group of proteins and glycoproteins, including gp40/15 (GP60), P23 (Cp23), and TRAP-C1, that are localized on the plasma membrane and apical complex of the infective sporozoite stage (O'Connor et al., 2007). These molecules are essential for the parasite's life cycle, mediating critical processes such as gliding motility, attachment to host enterocytes, and subsequent invasion of the intestinal epithelium (Cevallos et al., 2000). As the primary interface between the parasite and the host's immune system during the initial phase of infection, these antigens are major targets for neutralizing antibodies and are the focus of vaccine development efforts (Perryman et al., 1996). While no small-molecule drugs currently target these proteins directly, passive immunization strategies using hyperimmune bovine colostrum or monoclonal antibodies (e.g., 4D8, 3E2) have demonstrated the ability to inhibit infection by blocking these surface interactions (Riggs, 2002). Consequently, these antigens serve as vital biomarkers for exposure and are central to the development of both diagnostic tools and preventative therapeutics for cryptosporidiosis.

Other names

C. parvum surface proteinsSporozoite surface glycoproteinsCp40/15 complexP23 antigenGP15/40GP60Cp23

Neutralization of sporozoite infectivity by blocking attachment and invasion of host intestinal epithelial cells (Riggs, 2002).