Human immune response to Vibrio cholerae O1 whole cells and isolated outer membrane antigens

The serum immunoglobulin G (IgG) and mucosal secretory IgA (SIgA) response of human volunteers challenged with Vibrio cholerae O1 was analyzed for reactivity to V. cholerae O1 antigens by the immunoblot technique. Components of both in vitro- and in vivo (rabbit ligated ileal loop)-grown V. cholerae O1 were separated by sodium dodecyl sulfate-urea-polyacrylamide gel electrophoresis. Postchallenge serum IgG reacted uniquely with 15 antigens and with greater intensity than did prechallenge serum with at least 16 antigens. Serum IgG and SIgA reacted with antigens present in preparations from the homologous challenge strain of V. cholerae as well as antigens from strains of heterologous biotype or serotype. These heterologous antigens may represent antigens responsible for protection to rechallenge with a heterologous strain of V. cholerae. All the antigens detected by postchallenge jejunal fluid SIgA had an apparent molecular size of less than 25 kilodaltons. Serum IgG and jejunal fluid SIgA also reacted with antigens unique to in vivo-grown cells and several antigens in outer membrane preparations, suggesting that studies of protective immunity and V. cholerae O1 pathogenesis should include examination of both in vitro- and in vivo-grown V. cholerae O1 cellular antigens.

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