SODIUM-TRANSPORT IN RED-BLOOD-CELLS OF LAMPREY LAMPETRA-FLUVIATILIS

被引:17
作者
GUSEV, GP
SHERSTOBITOV, AO
BOGDANOVA, AY
机构
来源
COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY A-PHYSIOLOGY | 1992年 / 103卷 / 04期
关键词
D O I
10.1016/0300-9629(92)90178-S
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
1. Unidirectional Na+ influx in lamprey red blood cells was determined using Na-22 as a tracer. 2. Total Na+ uptake and amiloride-inhibitable Na+ influx increased in a saturable fashion as a function of external Na+ concentration (Na(e)). 3. At 141 mM Na(e), the average value of net Na+ influx was 13 +/- 1.1 and the amiloride-sensitive Na+ influx was 5.3 +/- 1.1 mmol/l cells per hr (+/- SE). 4. The amiloride-sensitive component of Na+ influx was significantly activated by 10(-5) M isoproterenol, by 2 x 10(-5) M DNP, and by cell shrinkage. 5. Furosemide (1 mM) had no effect on the Na+ transport in red cells. 6. The residual amiloride-insensitive component of Na+ transport was a linear function of Na(e) in the range of 5-141 mM. This transport seems to be accounted for by simple diffusion.
引用
收藏
页码:763 / 766
页数:4
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