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- W2010041302 abstract "2-Aminoethoxydiphenylborate (2-APB) inhibits the extent of inositol 1,4,5-trisphosphate (InsP(3))-induced Ca(2+) release from cerebellar microsomes with a potency that is dependent upon the InsP(3) concentration used. At high InsP(3) concentrations (10 microM), the concentration of 2-APB required to cause half-maximal InsP(3)-induced Ca(2+) release (IC(50)) was greater than 1 mM, while at 0.25 microM InsP(3) this reduced to 220 microM. The fact that the inhibition of the extent of InsP(3)-induced Ca(2+) release (IICR) by 2-APB was not restored to control levels by high concentrations of InsP(3), in addition to the fact 2-APB did not substantially inhibit [3H]InsP(3) binding to its receptor, indicates that the inhibition is not competitive in nature. Since the cooperativity of IICR as a function of InsP(3) was reduced in the presence of 2-APB (Hill coefficient changing from 1.9 in the absence of 2-APB to 1.4 in the presence of 1 mM 2-APB), this suggests that it is acting as an allosteric inhibitor. 2-APB also reduces the rate constants for IICR. In cerebellar microsomes this release process is biphasic in nature, with a fast and slow phase. 2-APB appears particularly to affect the fast-phase component. Although 2-APB does not inhibit the ryanodine receptor, it does inhibit the Ca(2+) ATPase activity as well store-operated Ca(2+) entry channels, which may limit its use as a specific membrane permeant InsP(3) receptor inhibitor." @default.
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- W2010041302 date "2002-11-01" @default.
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- W2010041302 title "Inhibition of the type 1 inositol 1,4,5-trisphosphate receptor by 2-aminoethoxydiphenylborate" @default.
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- W2010041302 doi "https://doi.org/10.1016/s0898-6568(02)00042-6" @default.
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