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We reported that an arylazide derivative of inositol 1,4,5-trisphosphate (InsP3) caused irreversible InsP3-induced Ca2+ release from saponin-permeabilized macrophages after photoirradiation. To determine the specific receptors for InsP3, presumably present on the endoplastic reticulum, we synthesized isotope-labeled arylazide derivatives of InsP3; InsP3 was coupled with p-azidobenzoyl [3H]beta-alanine (InsP3-[3H]AB beta A) or p-[125I]azidosalicyl beta-alanine (InsP3-[125I]AS beta A). We report here that three proteins may be associated with the Ca2+ releasing mechanism, in photoirradiated saponin-permeabilized macrophages and in the microsomal fraction.
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