Trans sarcolemmal Ca movements in rabbit and rat ventricular muscle were compared using extracellular double-barreled Ca-selective microelectrodes. In rabbit ventricle, steady-state twitches were associated with transient extracellular Ca (Cao) depletions, indicative of Ca uptake during the twitch. In contrast, steady-state twitches in rat ventricle were associated with net cellular Ca extrusion. Rest periods in rabbit ventricle lead to a net loss of cell Ca and resumption of stimulation induces a net uptake of Ca by the cells. Conversely, in rat ventricle rest periods lead to cellular Ca gain and resumption of stimulation induces a net Ca loss from the cells. Thus stimulation is associated with net Ca gain in rabbit ventricle and net Ca loss in rat ventricle. These observations provide an explanation for some of the functional differences between rat and rabbit ventricle (e.g., negative force-frequency staircase and rest potentiation in rat vs. positive staircase and rest decay in rabbit). Resting intracellular Na activity (alpha iNa) was 12.7 +/- 0.6 mM in rat and 7.2 +/- 0.5 mM in rabbit ventricle. This alpha iNa in rat ventricle is sufficiently high that Ca entry via Na-Ca exchange is thermodynamically favored at the resting membrane potential. This may explain why rest potentiation is observed in rat ventricle. In contrast, the lower alpha iNa in rabbit ventricle would favor Ca extrusion via Na-Ca exchange at rest (and consequent rest decay). In rat ventricle, the increase of intracellular [Ca] ([Ca]i) associated with contraction, coupled with the short action potential duration, strongly favor Ca extrusion via Na-Ca exchange and explain the observed Cao accumulation observed during twitches in rat. The high plateau of the rabbit ventricular action potential tends to prevent Ca extrusion via Na-Ca exchange during the contraction and explains the Cao depletions observed in rabbit. It is concluded that the higher alpha iNa and shorter action potential duration in rat vs. rabbit ventricle can explain many of the functional differences observed in these tissues.
The contribution of Na-activated K channel, the furosemide-sensitive (Na-K-Cl) cotransport, and Na-K pump to extracellular potassium accumulation during global ischemia was investigated using pharmacological blockade of these pathways. R 56865 (a blocker of the Na-activated K channel), furosemide, or ouabain was included in the perfusate before ischemia in the isolated rat heart preparation, and the extracellular K concentration ([K]e) was monitored during 30 min of global ischemia. In control hearts, [K]e showed an early rise (up to 9.0 +/- 0.2 mM from the baseline of 5.9 mM), a fall (to a minimum of 6.7 +/- 0.2 mM), and a late rise (to 14.1 +/- 0.4 mM by the end of ischemia). R 56865 (0.1 and 1 microM) suppressed the early [K]e rise to 50% of the control level. The late rise in [K]e was also significantly suppressed by the higher dose of R 56865. Furosemide (0.1 and 1 mM) reduced the early K accumulation by 35% but did not affect the rise of [K]e during the late ischemic phase. Blockade of Na-K pump by 10 microM ouabain did not increase [K]e during any phase of ischemia and, in fact, 100 microM ouabain profoundly suppressed the early rise in [K]e. We therefore suggest that the Na-activated K channel, the furosemide-sensitive cotransport, and changes in the activity of the Na-K pump may all contribute to extracellular K accumulation during ischemia. However, in addition to these pathways, it seems likely that other pathways for transsarcolemmal K efflux contribute to cellular K loss during ischemia in the isolated rat heart.(ABSTRACT TRUNCATED AT 250 WORDS)
Oxidant stress alters protein structure and function, possibly through the modification of the redox status of regulatory protein sulfhydryl groups. We used the sulfhydryl-blocking reagent p-chloromercuriphenylsulfonic acid (pCMPSA), applied selectively and independently to either the intracellular or extracellular environment, to study the relationship between blocking protein sulfhydryl groups and Na(+)-K+ pump current (i.p.). In guinea pig ventricular myocytes voltage clamped at -30 mV, extracellular pCMPSA (50, 100, and 400 microM) caused a concentration-dependent reduction in holding current. The selective intracellular administration of pCMPSA (100 microM) induced a similar inhibition of i.p., albeit over a longer time course. The inhibition of ip resulting from either the intracellular or extracellular application of pCMPSA (100 microM) was reversed, in part, by the extracellular application of dithiothreitol (3 mM). An intracellular oxidant stress was also imposed by using diethyl maleate to deplete the intracellular nonprotein sulfhydryl content [represented by reduced glutathione (GSH)]. In myocytes isolated from diethyl maleate-treated guinea pigs *860 mg/kg i.p., 30 min before study), intracellular GSH was depleted by 93% and i.p. was depressed by 38% at all membrane potentials tested. We propose that Na(+)-K+ pump function may be related to protein and nonprotein sulfhydryl status. Protein sulfhydryl oxidation and glutathione depletion may account, in part, for a depression in Na(+)-K+ pump activity during reperfusion-induced oxidant stress.
No abstract
Cardiac physiology and hypertrophy are regulated by the phosphorylation status of many proteins, which is partly controlled by a poorly defined type 2A protein phosphatase-alpha4 intracellular signalling axis. Quantitative PCR analysis revealed that mRNA levels of the type 2A catalytic subunits were differentially expressed in H9c2 cardiomyocytes (PP2ACb [ PP2ACa [ PP4C [ PP6C), NRVM (PP2ACb [ PP2ACa = PP4C = PP6C), and adult rat ventricular myocytes (PP2ACa [ PP2ACb [ PP6C [ PP4C). Western analysis confirmed that all type 2A catalytic subunits were expressed in H9c2 cardiomyocytes; however, PP4C protein was absent in adult myocytes and only detectable following 26S protea-some inhibition. Short-term knockdown of alpha4 protein expression attenuated expression of all type 2A catalytic subunits. Pressure overload-induced left ventricular (LV) hypertrophy was associated with an increase in both PP2AC and alpha4 protein expression. Although PP6C expression was unchanged, expression of PP6C regulatory subunits (1) Sit4-associated protein 1 (SAP1) and (2) ankyrin repeat domain (ANKRD) 28 and 44 proteins was elevated, whereas SAP2 expression was reduced in hypertrophied LV tissue. Co-immunoprecipitation studies demonstrated that the interaction between alpha4 and PP2AC or PP6C subunits was either unchanged or reduced in hypertrophied LV tissue, respectively. Phosphorylation status of phospholemman (Ser63 and Ser68) was significantly increased by knockdown of PP2ACa, PP2ACb, or PP4C protein expression. DNA damage assessed by histone H2A.X phosphorylation (cH2A.X) in hypertrophied tissue remained unchanged. However, exposure of cardiomy-ocytes to H 2 O 2 increased levels of cH2A.X which was unaffected by knockdown of PP6C expression, but was abolished by the short-term knockdown of alpha4 expression. This study illustrates the significance and altered activity of the type 2A protein phosphatase-alpha4 complex in healthy and hypertrophied myocardium. Keywords Type 2A protein phosphatase Á Alpha4 Á Cardiac hypertrophy Á Hydrogen peroxide Á H2A.X
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