Acute and Chronic Effects of Hyperosmolality on mRNA and Protein Expression and the Activity of Na-K-ATPase in the IMCD

Acute and Chronic Effects of Hyperosmolality on mRNA and Protein Expression and the Activity of Na-K-ATPase in the IMCD
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高渗透压对 IMCD 中 mRNA 和蛋白质表达以及 Na-K-ATP 酶活性的急性和慢性影响

DOI:
10.1159/000020617
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发表时间:
1999
影响因子:
--
通讯作者:
F. Marumo
F. Marumo
中科院分区:
--
文献类型:
--
作者:
M. Takayama;H. Nonoguchi;Tianxin Yang;K. Machida;Y. Terada;A. Owada;K. Tomita;F. Marumo

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研究了急性和慢性高渗对大鼠内髓集合管(IMCD)Na-K-ATP酶α和β亚型mRNA和蛋白表达及Na-K-ATP酶活性的影响。IMCD在高渗培养基中孵育30 min使Na-K-ATP酶活性降低50%。在等渗液中测得的脱水大鼠的Na-K-ATP酶活性降低,在高渗液中孵育并没有进一步降低活性。IMCD在高渗培养液中孵育6 h,α1 mRNA无明显变化。而脱水则使α1亚基mRNA和蛋白以及β1蛋白的表达下降,而β1 mRNA无明显变化。这些数据表明:(1)急性高渗透压降低了IMCD中的Na-K-ATP酶活性,但α1和β1 mRNA没有改变;(2)脱水2天通过减少α1和β1蛋白而降低了Na-K-ATP酶活性。因此,急性和慢性高渗对IMCD中Na-K-ATP酶活性的抑制机制是不同的。
We investigated acute and chronic effects of hyperosmolality on mRNA and protein expressions of Na-K-ATPase α and β isoforms and Na-K-ATPase activity in the rat inner medullary collecting duct (IMCD). Incubation of IMCD in hypertonic medium for 30 min reduced the Na-K-ATPase activity by 50%. The Na-K-ATPase activity of dehydrated rats measured in isotonic medium was decreased, and incubation in hypertonic medium did not further decrease the activity. Incubation of IMCD in hypertonic medium for 6 h did not change α1 mRNA. In contrast, dehydration decreased α1 subunit mRNA and protein and β1 protein expressions without changing β1 mRNA. These data show (1) that acute hyperosmolality decreases Na-K-ATPase activity in IMCD without changing α1 and β1 mRNA and (2) that 2 days of dehydration decreased Na-K-ATPase activity by reducing α1 and β1 proteins. Thus, the mechanisms for the inhibition of the Na-K-ATPase activity in IMCD is defferent between acute and chronic exposure to hyperosmolality.
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