Bay K 8644

Bay K 8644 ((±)-Bay K 8644) is a racemate consisting of two isomers (R)-(+)-Bay-K-8644 and (S)-(-)-Bay-K-8644[1]. Bay K 8644 is a L-type Ca2+ channel agonist with an EC50 of 17.3 nM. Bay K 8644 increases Ca2+ influx through sarcolemmal Ca2+ channels by increasing the open time of the channel. Bay K 8644 has vasoconstrictive effects[2][3].

[1]H Satoh, et al. Bay K 8644 increases resting Ca2+ spark frequency in ferret ventricular myocytes independent of Ca influx: contrast with caffeine and ryanodine effects. Circ Res. 1998 Dec 14-28;83(12):1192-204.|[2]J P Gomez, et al. Effects of Bay K 8644 on L-type calcium current from newborn rat cardiomyocytes in primary culture. J Mol Cell Cardiol. 1996 Oct;28(10):2217-29.|[3]N Ives,et al. BAY k 8644, a calcium channel agonist, reverses hypotension in endotoxin-shocked rats. Eur J Pharmacol. 1986 Nov 4;130(3):169-75.|[4]W Schreibmayer, et al. Kinetic modulation of guinea-pig cardiac L-type calcium channels by fendiline and reversal of the effects of Bay K 8644. Br J Pharmacol. 1992 May;106(1):151-6. |[5]G A Rae, et al. Interactions of calcium antagonists and the calcium channel agonist Bay K 8644 on neurotransmission of the mouse isolated vas deferens. Br J Pharmacol. 1989 Feb;96(2):333-40.