Table 1.

Ca²⁺ uptake into microsomes

	Ca2+uptake (µmol·g−1)	% Inhibition
Microsomes alone	45 ± 1.0	NA
Microsomes + thapsigargin (10−6M)	13.2 ± 0.6	71
Microsomes + DPI (3 × 10−5 M)	36.8 ± 0.7	18
Microsomes + DPI (10−4 M)	30.5 ± 0.9	32

Microsomes from pig coronary artery were incubated for 30 min in the presence of ATP (5 mM), oxalate (5 mM) and blockers (as indicated), and uptake of ⁴⁵Ca²⁺ was measured.

Values shown in the table are means ± SEM, from six microsomal preparations.

DPI, diphenyleneiodonium.