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2010). A direct correlation between the effects of PKA on pump function and glutathionylation of the ��1 pump subunit strongly supports the redox-dependent scheme for pump regulation that we propose. The direction http://www.selleckchem.com/products/bmn-673.html of the PKA-dependent effect on pump turnover rate we report is difficult to reconcile with a large majority of previous studies that report PKA-dependent stimulation of Na+�CK+ pump current in voltage clamped cardiac myocytes, as reviewed recently (Fuller et al. 2013). In principle, the whole-cell voltage clamp technique allows independent control of intracellular and extracellular Na+�CK+ pump ligands and membrane voltage, critical determinants of Na+�CK+ pump activity, and a shift in membrane current with pump inhibition is an accurate direct measure of Na+�CK+ pump turnover rate. However, the specific details of how the technique is applied are critical. A diffusion barrier between pipette solution and the intracellular compartment will cause redistribution of ions with Na+�CK+ pump inhibition, and the resulting changed conductance of ion channels can contaminate current shifts attributed to the small Ip. It is therefore important that non-pump currents are minimised (Gadsby et al. 1985; Gadsby & Nakao, 1989). Accuracy depends on an approximation of the concentration of Na+ in the intracellular compartment http://www.selleckchem.com/products/lee011.html to the concentration in patch pipette solutions. This can be evaluated from the Ip measured with Na+-free pipette solutions as described in detail by Gadsby & Nakao, (1989). A minimal gradient is typically achieved http://www.selleck.cn/products/AZD6244.html with a series resistance that is 100 nm by Gao et al. (1992, 1996), and suggested that the unphysiologically low levels of Ca2+ in the patch pipette solutions we use accounts for the pump inhibition we report. However, a period of 6�C8 min was required for steady state membrane currents to be achieved after whole-cell recording was established in the experiments reported by Gao et al. (1992), while this should occur in