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. 1994 Aug 2;91(16):7812–7816. doi: 10.1073/pnas.91.16.7812

Coordinate depression of bradykinin receptor recycling and microtubule-dependent transport by taxol.

S F Hamm-Alvarez 1, B E Alayof 1, H M Himmel 1, P Y Kim 1, A L Crews 1, H C Strauss 1, M P Sheetz 1
PMCID: PMC44492  PMID: 7914372

Abstract

Significant cardiovascular side effects have limited the use of taxol as an anticancer drug. A link between decreased plasma membrane dynamics and taxol has been implied because taxol can inhibit intracellular vesicle movements. Reduced membrane recycling caused by taxol could inhibit agonist-evoked Ca2+ signaling within endothelial cells, resulting in endothelium-dependent vasodilation. Bradykinin and ATP are two agonists that evoke Ca2+ transients in endothelial cells. Since the bradykinin receptor-agonist complex is internalized and recycled whereas the ATP agonist-receptor complex is not, we expected that a taxol inhibition of recycling would decrease bradykinin but not ATP receptor activity. We found that taxol depresses (i) the frequency (to 41% of control) and velocity (to 55% of control) of microtubule-dependent vesicle transport and (ii) bradykinin-evoked cytosolic Ca2+ transients (to 76% of control) in bovine aortic endothelial cells. In studying bradykinin receptor desensitization, which reflects receptor recycling, we demonstrate that taxol inhibits bradykinin-evoked Ca2+ transients by 50%. Taxol did not significantly alter ATP-evoked Ca2+ transients in either single-exposure or desensitization experiments. We suggest that taxol's reduction of bradykinin-evoked Ca2+ transients is due to altered microtubule-dependent membrane recycling. This report describes taxol's ability to alter plasma membrane composition through effects on vesicle transport and membrane trafficking pathways. This finding provides a possible mechanism by which taxol can substantially alter cardiovascular function.

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