Table 3.

Effect of 1000 µM NaHS, bumetanide, TEA and nicardipine on the rate of ⁴⁵Ca influx in cultured smooth muscle cells.

Additions, μM	45Ca influx, pmol/mg protein/5 min
	[K+]o=5 mM	[K+]o=30 mM
1. None (control)	100	278±23*
2. NaHS, 1000	106±15	177±18*
3. NaHS, 1000 + bumetanide, 10	113±21	170±25*
4. NaHS, 1000 + TEA, 104	112±16	277±18*, #
5. NaHS, 1000 + nicardipine, 2	88±14	100±12#

Means ± S.E. obtained in 5 independent experiments performed in quadruplicates are shown. The rate of Ca²⁺ influx at [K⁺]_o = 5 mM and in the absence of any additions listed in the left column varied from 389 and 425 nmol / mg protein / 5 min was taken as 100%.

^*- p < 0.05 compared to ⁴⁵Ca influx at [K⁺]_o = 5 mM.

^#p<0.05 compared to control at [K⁺]_o = 30 mM, in the presence of 1000 μM NaHS ( there was no significant differences of Ca²⁺ influx in the presence of additions at [K⁺]_o = 5 mM).