Abstract
Diphosphoryl lipid A derived from nontoxic lipopolysaccharide (LPS) of Rhodopseudomonas sphaeroides ATCC 17023 did not stimulate the murine pre-B cell line 70Z/3 to synthesize surface immunoglobulin or kappa mRNA. However, it effectively blocked Escherichia coli LPS-induced activation of 70Z/3 cells in a concentration-dependent manner. This inhibition was specific only to cells activated by LPS, since it did not inhibit activation of 70Z/3 cells by gamma interferon. Maximal inhibitory effect occurred when the antagonist was added within 2 h before adding the LPS. These results strongly suggested that R. sphaeroides diphosphoryl lipid A is competing with E. coli LPS for physiological lipid A receptors on the 70Z/3 cells.
MeSH Terms
Animals
B-Lymphocytes/drug effects,immunology
Hematopoietic Stem Cells/drug effects
Immunoglobulin kappa-Chains/genetics
Lipid A/analogs & derivatives,pharmacology
Lipopolysaccharides/antagonists & inhibitors
Lymphocyte Activation/drug effects
Mice
RNA, Messenger/analysis
Receptors, Antigen, B-Cell/analysis
Rhodobacter sphaeroides/metabolism
Structure-Activity Relationship
Chemicals
Immunoglobulin kappa-Chains
Lipid A
Lipopolysaccharides
RNA, Messenger
Receptors, Antigen, B-Cell
diphosphoryl lipid A
Authors & Affiliations
3 authors, click to expand affiliations / ORCID
Kirkland T N
Department of Pathology, University of California, San Diego 92093.
Qureshi N
Takayama K
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