Quinine sensitive changes in cellular Na+ and K+ homeostasis of COS-7 cells caused by a lipophilic phenol red impurity

In Vitro Cellular & Developmental Biology. Animal
L HoppB W Day

Abstract

An impurity of phenol red (PRI) has been shown to markedly alter the intracellular Na+ and K+ homeostasis of several cell types. The effect of PRI seems to involve intracellular Ca(++)-dependent mechanisms. Using COS-7 cells as a model, we further characterized the mechanism of action of PRI by measuring cellular Na+/K+ contents and 86Rb+ efflux. Similar to human skin fibroblasts, in COS-7 cells calmodulin inhibition moderated the cationic transport effects of PRI. A TMB-8 dependent intracellular Ca++ pool does not seem to be involved in these transport events. We found no evidence for participation of the transcriptional-translational machinery in the effect of PRI. Both quinine and quinidine are able to prevent nearly all changes caused by PRI in the cellular Na+/K+ contents and 86Rb+ efflux. Although phenol red contained multiple impurities by high performance liquid chromatography (HPLC), phenolphthalein, a structurally close relative of phenol red, was free of any detectable contamination. Phenolphthalein elicited qualitatively similar transport changes to those observed during exposure to PRI. Regardless of the exact mechanism of action, we propose that the as yet unidentified substance is not a cellular toxin, rather it ...Continue Reading

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Citations

Oct 20, 2000·In Vitro Cellular & Developmental Biology. Animal·J E Moreno-Cuevas, D A Sirbasku
Apr 1, 2004·Clinical and Experimental Pharmacology & Physiology·Robert W MasonJohn B Lloyd
Aug 28, 2003·Clinical and Experimental Pharmacology & Physiology·Robert W MasonLaszlo Hopp
Oct 23, 1998·Journal of Medicinal Chemistry·L HoppJ B Lloyd
Dec 6, 1996·Journal of Medicinal Chemistry·P R KymJ A Katzenellenbogen

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