MEASUREMENT OF BOTH CYCLIC [H-3] AMP AND CYCLIC [H-3] GMP IN CULTURED VASCULAR SMOOTH-MUSCLE CELLS LABELED WITH [H-3] HYPOXANTHINE - USE IN STUDIES OF CARDIOVASCULAR DRUGS

被引:10
|
作者
MAURICE, DH
LEE, RMKW
HASLAM, RJ
机构
[1] MCMASTER UNIV, DEPT PATHOL, HAMILTON L8N 3Z5, ON, CANADA
[2] MCMASTER UNIV, DEPT ANAESTHESIA, HAMILTON L8N 3Z5, ON, CANADA
[3] MCMASTER UNIV, DEPT BIOCHEM, HAMILTON L8N 3Z5, ON, CANADA
关键词
Muscle; -; Cytology; Nucleotides;
D O I
10.1006/abio.1993.1562
中图分类号
Q5 [生物化学];
学科分类号
071010 ; 081704 ;
摘要
We describe a method for prelabeling cultured vascular smooth muscle cells that permits rapid and accurate measurements of changes in the amounts of cyclic AMP and of cyclic GMP in 5 × 105 cells. This procedure utilizes [3H]hypoxanthine to radiolabel both the adenine and guanine nucleotide pools and simple column chromatographic steps to isolate and separate the 3H-labeled cyclic nucleotides. The application of the method to studies of the actions of cardiovascular drugs on vascular smooth muscle cells is illustrated by measurements of the effects of isoproterenol, nitroprusside, and inhibitors of cyclic AMP phosphodiesterases on the cyclic nucleotide levels in these cells. If required, the mass amounts of cyclic AMP and cyclic GMP present could be determined by measurement of the specific radioactivities of the precursor [3H]ATP and [3H]GTP, respectively. The cyclic nucleotide values calculated by the latter method were almost identical to those obtained with larger numbers of cells using commercially available radioimmunoassays, thus validating the prelabeling assays. The method described should be applicable to any type of cultured cell that can utilize [3H]-hypoxanthine to replenish its ATP and GTP pools. © 1993 Academic Press, Inc.
引用
收藏
页码:110 / 117
页数:8
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