the sensitivity of the tpa-induced increase in calcium concentration to omega-cgtx , nicardipine and nifedipine , but not to low concentrations of verapamil ( 1 microm ) , suggests that the tpa-induced rise in calcium concentration is mediated by increased ca2+ influx through 1,4-dihydropyridine-sensitive ca2+ channels .
C0028066
nifedipine
C0012315
dihydropyridine