2-Aminoethoxydiphenyl borate (2-APB) is a reliable blocker of store-operated Ca²⁺ entry but an inconsistent inhibitor of InsP₃-induced Ca²⁺ release

Bootman, Martin D.; Collins, Tony J.; MacKenzie, Lauren; Roderick, H. Llewelyn; Berridge, Michael J. and Peppiatt, Claire M. (2002). 2-Aminoethoxydiphenyl borate (2-APB) is a reliable blocker of store-operated Ca²⁺ entry but an inconsistent inhibitor of InsP₃-induced Ca²⁺ release. The FASEB Journal, 16(10) pp. 1145–1150.

DOI: https://doi.org/10.1096/fj.02-0037rev

Abstract

Since its introduction to Ca²⁺ signaling in 1997, 2-aminoethoxydiphenyl borate (2-APB) has been used in many studies to probe for the involvement of inositol 1,4,5-trisphosphate receptors in the generation of Ca²⁺ signals. Due to reports of some nonspecific actions of 2-APB, and the fact that its principal antagonistic effect is on CaCa²⁺ entry rather than Ca²⁺ release, this compound may not have the utility first suggested. However, 2-APB has thrown up some interesting results, particularly with respect to store-operated Ca²⁺ entry in nonexcitable cells. These data indicate that although it must be used with caution, 2-APB can be useful in probing certain aspects of Ca²⁺ signaling

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