Abstract
Rat models of genetic hypertension include spontaneous hypertension and resistance or sensitivity to mineralocorticoid and salt induced hypertension. Previously, altered aldosterone binding to corticoid receptor I was found in aortic smooth muscle cells cultured from Fischer 344 rats which are extremely resistant to steroid and salt induced hypertension. The cortocoid receptor I of Fisher 344 rats had a lower affinity than that of salt sensitive Wistar-Kyoto controls, as well as spontaneously hypertensive rats and Sprague-Dawley rats. In the present study, we have used DEAE-cellulose ion exchange chromatography to compare the structure (charge properties) and steroid specificity of vascular corticoid receptor I and II sites in these same rat hypertension models. No variations in ion exchange properties of type I and II receptors were found. Together with the lower aldosterone affinity of corticoid receptor I sites in Fischer 344 rats these data suggest an altered binding domain which is not seen as a difference in charge density of the receptor protein by ion exchange chromatography.
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