Synthetic form of the macrocyclic bis-1-oxaquinolizidine isolated from the Okanowan marine sponge.
Biochem/physiol Actions
Xestospongin C is a potent, reversible and membrane-permeable blocker of IP3-mediated Ca2+release (IC50=358 nM).
Xestospongin C is a selective, reversible and membrane-permeable inhibitor of IP3 receptor. Reversibly blocks bradykinin- and carbamylcholine- Ca2+ efflux from the endoplasmic reticulum stores.
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British journal of pharmacology, 130(3), 650-654 (2000-05-24)
We evaluated the role of the inositol 1,4,5-triphosphate (IP(3)) receptor-mediated Ca(2+) release on the positive inotropic effects of alpha-adrenergic stimulation using a novel, potent, selective membrane-permeable blocker of IP(3) receptor, xestospongin C. Guinea-pig papillary muscle permeabilized with saponin exhibited spontaneous
Xestospongins (Xe's) A, C, D, araguspongine B, and demethylxestospongin B, a group of macrocyclic bis-1-oxaquinolizidines isolated from the Australian sponge, Xestospongia species, are shown to be potent blockers of IP3-mediated Ca2+ release from endoplasmic reticulum vesicles of rabbit cerebellum. XeC
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