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Research Article

Mechanism of protective immunity induced by porin-lipopolysaccharide against murine salmonellosis.

S Muthukkumar, V R Muthukkaruppan
S Muthukkumar
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V R Muthukkaruppan
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ABSTRACT

Investigations were undertaken to characterize the protective immunity induced by porin-lipopolysaccharide (LPS) against Salmonella typhimurium infection in mice. Mice immunized with porin-LPS showed higher levels of antiporin immunoglobulin G than mice which received porin alone. Further, T cells from porin-LPS-immunized mice showed an augmented proliferative response to porin in vitro compared with the response of T cells from porin-injected animals. The passive transfer of anti-LPS antibodies conferred significant protection (17%), while antiporin serum failed to protect mice against lethal challenge, indicating the protective ability of anti-LPS antibodies. However, the transfer of serum obtained from porin-LPS-immunized mice resulted in better protection (30%) than did anti-LPS or antiporin antibodies alone. In contrast to LPS, monophosphoryl lipid A completely failed to induce protection against lethal infection. However, comparable to the effect of LPS, injection of porin with monophosphoryl lipid A enhanced antibody response and the protective ability of porin (81.25%). The transfer of T cells from porin-LPS-immunized mice provided higher levels of protection (47%) against lethal challenge than did T cells from porin-immunized mice (23%). The combination of T cells and serum from porin-immunized mice transferred 36% protection. However, a combination of T cells and serum from porin-LPS-immunized mice conferred the highest level of protection (92%), which was reflected by the number of survivors (100%) in the porin-LPS-immunized group. These results demonstrate that besides the protective effect of anti-LPS antibodies, the ability of LPS to augment humoral and cell-mediated immune responses to porin confers effective protection against Salmonella infection.

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Mechanism of protective immunity induced by porin-lipopolysaccharide against murine salmonellosis.
S Muthukkumar, V R Muthukkaruppan
Infection and Immunity Jul 1993, 61 (7) 3017-3025; DOI:

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Mechanism of protective immunity induced by porin-lipopolysaccharide against murine salmonellosis.
S Muthukkumar, V R Muthukkaruppan
Infection and Immunity Jul 1993, 61 (7) 3017-3025; DOI:
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