[Changes in intracellular K+ concentration and ATPase activity of myocardiocytes in early stage of burn injury].
In this experiment, intracellular K+ concentration ([K+]i) and ATPase activity of myocardiocytes were measured in early stage of burn injury. Comparing with control group, it was found that, 1. [K+]i were decreased after burn injury, [K+]i of 1st, 3rd, 8th and 24th hours were decreased to 96.2 +/- 1.3%, 85.8 +/- 1.3%, 65.9 +/- 1.0% and 73.7 +/- 1.1% of normal, respectively. 2. Cardiac sarcolemma total ATPase, Mg(2+)-ATPase and Na(+)-K(+)-ATPase activities were all reduced significantly at 8th hour after injury. These results suggest that, burn injury accelerates K+ efflux current, but inhibits K+ influx current, and the reduction of Na(+)-K(+)-ATPase activity is one reason of decrease of [K+]i after injury.
Li
M
M
Department of Physiology, Third Military Medical College, Chongqing.
Xiao
J
J
Yan
S
S
D000818:Animals; D002056:Burns / Q000378:metabolism*; D002462:Cell Membrane / Q000378:metabolism; D005260:Female; D066298:In Vitro Techniques; D008297:Male; D009206:Myocardium / Q000378:metabolism*; D011188:Potassium / Q000378:metabolism*; D051381:Rats; D017208:Rats, Wistar; D000254:Sodium-Potassium-Exchanging ATPase / Q000378:metabolism
D000254:Sodium-Potassium-Exchanging ATPase; D011188:Potassium