Cardiac action potential duration and calcium regulation in males and females.
Adult women have longer QT intervals compared with men of a similar age, indicating differences in the speed of repolarisation of the ventricles. We investigate the influences of gender on ventricular electrophysiology and intracellular Ca(2+) regulation of the guinea pig heart. Comparing sexually mature animals, females exhibited a significantly longer APD. Peak L-type Ca(2+) current (I(CaL)) was larger in females and when this current was inhibited with nifedipine the gender differences in APD were removed. APD differences also disappeared when the SR was depleted of Ca(2+). Inactivation of I(CaL) during a clamp step is faster in females but slower during an action potential and SR Ca(2+) content is larger. We suggest that gender differences in APD result from variation in the kinetics of I(CaL) stemming from alterations to Ca(2+) release.
Mason
Sammy A
SA
Department of Cardiology, School of Medicine, Cardiff University, Wales Heart Research Institute, Heath Park, Cardiff CF14 4XN, UK.
MacLeod
Kenneth T
KT
D000200:Action Potentials; D000818:Animals; D002118:Calcium / Q000378:metabolism*; D020746:Calcium Channels, L-Type / Q000378:metabolism*; D005260:Female; D006168:Guinea Pigs; D006352:Heart Ventricles / Q000378:metabolism*; D008297:Male; D012519:Sarcoplasmic Reticulum / Q000378:metabolism / Q000502:physiology; D012737:Sex Factors; D016276:Ventricular Function
D020746:Calcium Channels, L-Type; D002118:Calcium