pertussis toxin pretreatment did not enhance adenylate cyclase activity indirectly via reducing the extracellular ca2+-induced rise in cytosolic ca2+ , since the cytosolic ca2+ level at 5 mm ca2+ was about 60 % higher in pertussis toxin-treated than in control cells ( 531 +/- 85 vs. 326 +/- 35 nm ; p less than 0.05 ) .
C1383501
cytosolic
C0007634
cells