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Infect Immun. 1987 February; 55(2): 288-292

Differentiation and interaction of secretory immunoglobulin A and a calcium-dependent parotid agglutinin for several bacterial strains.

J Rundegren and R R Arnold

ABSTRACT

Previous studies have suggested that both secretory immunoglobulin A (sIgA) and various nonimmunoglobulin salivary glycoproteins are capable of agglutinating a variety of bacteria. The present study was designed to compare the nature of the agglutinins for Streptococcus mutans and Salmonella typhimurium in parotid saliva and colostrum. S. mutans was aggregated by saliva and colostrum, whereas S. typhimurium was aggregated only by saliva as detected by a spectrophotometric method. The principal salivary agglutinin for both S. mutans and S. typhimurium was calcium dependent and could be desorbed in phosphate-buffered saline (pH 6.8). In contrast, the colostral agglutinin was calcium independent and not readily desorbed. The agglutinin activities of saliva and colostrum for S. mutans were additive, suggesting independent target sites on the bacterial surface. The agglutinin activity of colostrum was totally associated with sIgA as was suggested by blocking of the agglutinating activity with anti-alpha-chain serum and the absence of blocking with an antibody specific for salivary agglutinin. Interestingly, anti-alpha-chain serum removed all agglutinating activity from saliva, but not from the phosphate-buffered saline-desorbed agglutinin. Dialysis of parotid saliva against 0.1 M disodium EDTA eliminated the agglutinin blocking activity of anti-alpha-chain serum but not that of the antiagglutinin antibody. The ability of anti-alpha-chain serum to block agglutination of the EDTA-dialyzed saliva could be restored by the addition of calcium chloride, suggesting that sIgA and salivary agglutinin are associated through a calcium-mediated interaction. These results indicate that bacterial agglutinating activity of colostrum, as detected spectrophotometrically, is mediated by sIgA, and that of saliva is mainly dependent upon a calcium-dependent nonimmunoglobulin agglutinin. The agglutinating activities of sIgA and parotid agglutinin seem to be additive, and their calcium-dependent association may favor the enhancement of their respective activities.

Infect Immun. 1987 February; 55(2): 288-292




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