Immunosuppressive Effect of Bacterial Lipopolysaccharide on Antibody Response

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Abstract
Injection of [Salmonella typhimurium, S. minnesota] endotoxins (bacterial lipopolysaccharide [LPS] several days prior to immunization causes the suppression of antibody response. The suppressive effects of several kinds of LPS preparations on the plaque-forming cell (PFC) antibody response in the spleen of mice were examined after immunization with sheep red blood cells (SRBC). Glycolipids obtained from heptoseless mutants (Re form) of Salmonella or its lipid A preparation coupled artificially with bovine serum albumin (BSA) are capable, like LPS obtained from a wild type (S form) strain, of inducing suppression of the PFC response, while alkaline-detoxified LPS can not. The refractory periods of the PFC response induced by LPS injection last only a few days. The use of cyclophosphamide (CY) with LPS can extend the refractory periods of antigenic stimulation for several weeks. Injections of LPS and CY can also induce unresponsive states of OH agglutinin antibody response to antigenic stimulation with formalin-killed organisms of Escherichia coli or Salmonella enteritidis (presumably both thymus-independent antigens). These unresponsive states induced by LPS and CY are easily terminated by a transfer of syngeneic bone marrow cells, but not by thymocyte transfer.