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- W2034762025 abstract "The characteristics of [3H]Ins(1,4,5)P3 binding to human temporal cortical and cerebellar membranes have been determined and compared with the binding to calf cerebellar membranes. Association and dissociation of ligand was very rapid, k1 and k−1 values of the order of 7 × 107 M−1 min−1 and 0.2 min−1, respectively, KD values were 2.7 and 3.5 nM for temporal cortex and cerebellum, respectively. The corresponding Bmax values were 165 and 482 fmol/mg protein. Binding was influenced in a biphasic manner by calcium. The temporal cortical binding was inhibited by Ins(1,4,5)P3 and analogues with the following IC50 values (nM): Ins(1,4,5)P3 9.5 and 6.2 (two different salts from different sources), Ins(2,4,5)P3 42, Ins(1,3,4,5)P4 670, Ins(1,2,5,6)P4 2620, Ins(3,4,5,6)P4 4300, Ins(1,3,4,5,6)P3 5490, InsP65280, Ins(4,5)P2 2660, Ins(1)P 3300, with the IC50 values for Ins(1,5,6)P3, Ins(1,4)P2 and Ins(4)P being > 25 μM. The IC50 value for heparin was 2.1 μg/ml. A similar pattern was seen in the cerebellum. In both tissues, the Hill slopes were near unity for all compounds except Ins(3,4,5,6)P4, where the slope was 0.4. The calf cerebellum had a similar ligand specificity (although the potency was generally lower) when values were expressed relative to that of Ins(1,4,5)P3, with the possible exception of Ins(1,3,4,5)P4, which had a greater relative potency. These data would suggest that in the human temporal cortex and cerebellum, [3H]Ins(1,4,5)P3 binding sites are expressed in different densities, but have similar properties. There may, however, be species differences in the [3H]Ins(1,4,5)P3 recognition site." @default.
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- W2034762025 date "1994-01-01" @default.
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- W2034762025 title "Characterization of [3H]inositol 1,4,5-trisphosphate binding sites in human temporal cortical and cerebellar membranes" @default.
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- W2034762025 doi "https://doi.org/10.1016/0197-0186(94)90131-7" @default.
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