化学性质：                                                                                                             

产品描述：                                                                                                            

BHQ is a selective inhibitor of endoplasmic reticulum Ca2+-ATPase.

Endoplasmic reticulum Ca2+-ATPase (SR Ca2+-ATPase) is a Ca2+-ATPase and transfers Ca2+ from the cytosol of the cell to the lumen of the sarcoplasmic reticulum (SR) during muscle relaxation.

BHQ is a selective SR Ca2+-ATPase inhibitor. In rat basophilic leukaemia cells, BHQ (10 μM) blocked inward rectifier potassium current and might cause depolarization of the cell and affect Ca2+ influx [1]. In aortic rings at rest or depolarised with 80 mM K+ in the presence of 1 mM nifedipine, BHQ induced a slow tonic contraction. At 20 mM K+, BHQ increased Ca2+-induced contraction. However, BHQ inhibited Ca2+-induced contraction at 40, 80 and 128 mM K+ [2]. In smooth muscle cells from the rat tail artery, BHQ reduced L-type Ca2+ current (ICa(L)) with IC50 value of 66.7 μM in a concentration- and voltage-dependent way. BHQ increased superoxide anion formation, which was markedly inhibited by superoxide dismutase (SOD). These results suggested that BHQ inhibited ICa(L) by the generation of superoxide anion [3]. In Madin Darby canine kidney (MDCK) cells, BHQ increased [Ca2+]i with EC50 value of 40 μM in a dose-dependent way, which was contributed by depleting the endoplasmic reticulum Ca2+ store followed by capacitative Ca2+ entry [4].

特别提醒：