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The t-tubules of mammalian ventricular myocytes are invaginations of the surface membrane that form a complex network within the cell, with restricted diffusion to the bulk extracellular space. The trans-sarcolemmal flux of many ions, including Ca2+, occurs predominantly across the t-tubule membrane and thus into and out of this restricted diffusion space. It seems possible, therefore, that ion concentration...
We investigated in the single myocytes of rat heart the effect of blocking of ATP-ase of sarcoplasmic reticulum (SR) on mitochondrial Ca2+ uptake and release. Mitochondrial Ca2+ content was investigated as Mn2+ - resistant fluorescence of Indo 1 - AM loaded into cells. SR ATP-ase was blocked with 10-6 M thapsigargin (Tg). Tg blocked almost completely stimulation Œdependent mitochondrial Ca2+ uptake...
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