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Adjuvant Activity of Klebsiella O3 Lipopolysaccharide: Inhibition of the Adjuvant Activity by Concanavalin A
Author(s) -
Kato Nobuo,
Kido Nobuo,
Ohta Michio,
Naito Setsuko
Publication year - 1985
Publication title -
microbiology and immunology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.664
H-Index - 70
eISSN - 1348-0421
pISSN - 0385-5600
DOI - 10.1111/j.1348-0421.1985.tb00820.x
Subject(s) - adjuvant , lipopolysaccharide , concanavalin a , lipid a , ovalbumin , microbiology and biotechnology , biology , pharmacology , biochemistry , immunology , antigen , in vitro
Klebsiella O3 lipopolysaccharide (KO3 LPS) was found to exhibit extraordinarily strong adjuvant activity in augmenting antibody responses and delayed‐type hypersensitivity (DTH) to protein antigens in mice. The O‐specific polysaccharide chain of KO3 LPS consists of α‐mannoside. We investigated the effect of concanavalin A (Con A) or succinyl Con A, which is known to bind to α‐mannoside, on the adjuvant activity of KO3 LPS in augmenting DTH to ovalbumin. When KO3 LPS was mixed with Con A prior to injection, the strong adjuvant activity of KO3 LPS in augmenting DTH was inhibited and the degree of inhibition depended upon the dose of Con A. An equal amount of Con A elicited nearly complete inhibition of the adjuvant activity of KO3 LPS, Con A at 1/10 the amount of LPS elicited partial inhibition, and Con A at 1/100 the amount of LPS showed no inhibition. An equal amount of succinyl Con A, which induced less marked aggregation of KO3 LPS than Con A, elicited inhibition of the adjuvant activity of KO3 LPS to an extent similar to that by Con A. On the other hand, Con A or succinyl Con A bound to KO3 LPS did not impair in any way the lethal toxicity of KO3 LPS for mice which is known to be due to the lipid A moiety. From these findings it is concluded that the strong adjuvant activity of KO3 LPS does not solely depend upon the lipid A moiety but the O‐specific polysaccharide moiety plays an important role in expression of the adjuvant activity.