Cross-linking of the IgM and IgD Ag-R on mature B lymphocytes provokes the rapid hydrolysis of phosphatidylinositol 4,5-bisphosphate. We show here that in permeabilized, [3H]inositol-labeled mouse B cells the nonhydrolyzable GTP analogue GTP gamma S induces release of inositol phosphates, including inositol trisphosphate. The response is markedly augmented by the addition of polyclonal anti-Ig or anti-mu or anti-delta mAb. Inositol phosphate release provoked in intact B cells by any of the anti-receptor antibodies was not inhibited by pertussis toxin and only partially inhibited by cholera toxin. The results therefore indicate that both IgM- and IgD-R on B cells are coupled to the polyphosphoinositide-specific phosphodiesterase by one or more G proteins, which have yet to be identified.
G protein coupling of antigen receptor-stimulated polyphosphoinositide hydrolysis in B cells.
Published 1988 in Journal of Immunology
ABSTRACT
PUBLICATION RECORD
- Publication year
1988
- Venue
Journal of Immunology
- Publication date
1988-05-01
- Fields of study
Biology, Medicine
- Identifiers
- External record
- Source metadata
Semantic Scholar, PubMed
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