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Spontaneous transient inward currents

FIG. 5. Ca2+ sparks drive electrical activity in myocytes. In contrast to the traditional concept of electrical activity deriving from descending neural control via postsynaptic responses, spontaneous Ca2+ release results in electrical activity in smooth muscle. The figure shows a Ca2+ spark activating sarcolemmal Ca2+-activated Cl- channels and spontaneous transient inward currents (STICs) (current trace above). Whether Ca2+ sparks activate outward STOCs (Ca2+-activated K+ currents) or STICs will depend on the proportion of channels expressed and the resting potential of the myocyte. [Pg.117]

Wang Q, Hogg RC, Large WA 1992 Properties of spontaneous inward currents recorded in smooth muscle cells isolated from the rabbit portal vein. J Physiol 451 525—537 ZhuGe R, Sims SM, Tuft RA, Fogarty KE, Walsh JV 1998 Ca2+ sparks activate K+ and Cl-channels, resulting in spontaneous transient currents in guinea-pig tracheal myocytes. J Physiol 513 711-718... [Pg.203]

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