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|Immune recognition of the surface associated antigen, Tc-SAA-1, from infective larvae of Teladorsagia circumcincta
surface associated antigen
|Nisbet A, Knox D, McNair C, Meikle L, Smith S, Wildblood L & Matthews J (2009) Immune recognition of the surface associated antigen, Tc-SAA-1, from infective larvae of Teladorsagia circumcincta. Parasite Immunology, 31 (1), pp. 32-40. https://doi.org/10.1111/j.1365-3024.2008.01070.x
|A cDNA encoding a surface-associated antigen was amplified by reverse transcriptase polymerase chain reaction (PCR) from RNA extracted from Teladorsagia circumcincta exsheathed third stage larvae (xL3). The protein encoded by this cDNA, Tc-SAA-1, displays 77% identity over 162 amino acid residues to a surface associated antigen from Ancylostoma caninum (Ac-SAA-1). Antiserum raised against a bacterially-expressed recombinant form of Tc-SAA-1 reacted with a native protein in somatic and surface extracts of xL3 but not with L4 or adult parasites. Limited binding of anti-Tc-SAA-1 antibody was observed on the cuticular surface of xL3 s, however, regions of localization underlying the cuticle were observed. Incubation of xL3 T. circumcincta with anti-SAA rabbit serum failed to significantly inhibit penetration of the abomasal mucosa in vitro. IgA in abomasal mucus derived from sheep that had received a trickle infection of T. circumcincta bound recombinant Tc-SAA-1.
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