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. 1988 Dec;85(24):9856–9860. doi: 10.1073/pnas.85.24.9856

Multiple signaling pathways control stimulus-secretion coupling in rat peritoneal mast cells.

R Penner 1
PMCID: PMC282880  PMID: 3059353

Abstract

Fura-2 and membrane capacitance measurements were performed to investigate intracellular Ca2+ concentration [( Ca2+]i) and secretory responses of rat peritoneal mast cells following secretagogue stimulation. Compound 48/80 and internally applied guanosine 5'-[gamma-thio]triphosphate (GTP[gamma-S]) induced transient rises in [Ca2+]i and caused membrane capacitance increases as secretion occurred. The 48/80-induced Ca2+ transients and secretory responses were blocked by guanosine 5'-[beta-thio]diphosphate and neomycin, indicating that inositolphospholipid breakdown mediated by guanine nucleotide-binding regulatory protein (G protein) plays an important role in stimulus-secretion coupling. However, pertussis toxin did not block Ca2+ transients induced by 48/80 or GTP[gamma-S], whereas secretory responses were either abolished (48/80) or developed only after a considerable delay (GTP[gamma-S]). Similar effects were obtained by perfusing cells with cAMP: (i) Ca2+ transients following stimulation with 48/80 remained unaffected by cAMP, but secretory responses were abolished; (ii) GTP[gamma-S] induced normal Ca2+ transients and degranulation in the presence of cAMP. Pretreatment of mast cells with phorbol 12-myristate 13-acetate (PMA) abolished 48/80- and GTP[gamma-S]-induced Ca2+ transients (but not inositol trisphosphate-induced Ca2+ transients), whereas secretion still occurred. At the same time, the Ca2+ requirement for secretion was reduced by PMA. These results indicate that secretion in mast cells is under control of an as yet unidentified signaling pathway that involves a G protein. This pathway is distinct from inositolphospholipid turnover and may provide the triggering mechanism for secretion, whereas the inositolphospholipid pathway serves to increase [Ca2+]i and renders the secretory process more sensitive to [Ca2+]i by activating protein kinase C. Persistent activation of protein kinase C through phorbol ester imposes negative feedback control on the inositolphospholipid pathway, whereas cAMP may inhibit the unidentified signaling pathway.

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Selected References

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