The role of calcium entry on the relaxation response of rho-kinase inhibitor in rabbit renal artery

This study was performed to clarify the role of extracellular and intracellular Ca2+ on rho-kinase enzyme inhibition-induced relaxation in rabbit renal arteries. The response to rho-kinase inhibitor (Y-27632) was studied in isolated renal artery segments precontracted with phenylephrine in the presence of voltage-gated calcium channel blocker nifedipine and in the absence of intracellular or extracellular Ca2+. Cumulative addition of rho-kinase inhibitor Y-27632 (10(-8)-10(-5) M) produced a concentration-dependent relaxation in renal artery rings precontracted with phenylephrine. Preincubation with nifedipine (1 mu M) resulted in a significant increase in relaxation response to rho-kinase inhibitor Y-27632 compared with preincubation with DMSO; the solvent of nifedipine. The maximal relaxation to Y-27632 in renal arteries precontracted with phenylephrine was significantly increased in the Ca-free Krebs containing 100 mu mol/l ethylene glycol tetraacetic acid (EGTA) but after depletion of intracellular stores with 20 mmol/l caffeine and 1mmol/l EGTA in Ca2+ free Krebs there was no significant difference between the relaxation to Y-27632 from control response in 2.5 mmol/l Ca2+ Krebs in the renal artery. These results suggest the involvement of extracellular Ca and L-type voltage-operated Ca2+ channels in phenylephrine-induced rho-kinase activation (Fig. 3, Ref. 20). Full Text in PDF www.elis.sk.