Commonly used ryanodine receptor activator, 4-chloro-m-cresol (4CmC), is also an inhibitor of SERCA Ca2+ pumps.
Pharmacol Rep 2010;
61:838-42. [PMID:
19904006 DOI:
10.1016/s1734-1140(09)70139-2]
[Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2009] [Revised: 09/05/2009] [Indexed: 11/23/2022]
Abstract
4-Chloro-m-cresol (4CmC) is an extensively used activator of ryanodine receptors (RyRs). Studies have shown that 4CmC, at a concentration of 1 mM, is sufficient to cause Ca(2+) release through RyRs. Here, we show that mM concentrations of 4CmC also inhibit the sarcoplasmic-endoplasmic reticulum Ca(2+)-ATPase (SERCA), (IC(50) 2-3mM) and cause Ca(2+) release. 4CmC also causes increased intracellular [Ca(2+)] levels in COS-7 cells, which lack functional RyRs. Thus, any increase in [Ca(2+)] levels associated with use of 4CmC (>or= 1mM) could lead to non-specific Ca(2+) changes due to SERCA inhibition rather than RyR activation.
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