Cardioprotective actions of taurine against intracellular and extracellular calcium-induced effects

Abstract

The effects of taurine were modulated by the [Ca2+](i) or/and [Ca2+](o) levels, consistent with recent reports (10,28,31). Taurine may directly and indirectly regulate the [Ca2+](i) level by modulating Ca2+ channels (dependent on [Ca2+](i)/[Ca2+](o)) and Na+ channel (via Na+- Ca2+ exchange). Thus, taurine antagonizes Ca2+ ([Ca2+](o) or [Ca2+](i))-induced cardiac functions. The data for the effects of taurine on the ionic currents and action potentials (automaticity) are summarized in Tables 1 and 2. These results indicate that taurine exerts potent cardioprotective actions under the conditions induced by low Ca2+ level as well as by calcium overload. In conclusion, the effects of taurine are complex, there being a number of actions on cardiac muscle which may show the possible therapeutic use of this sulfur amino acid.