Down-regulation of cardiac bradykinin B2 receptors and eNOs mRNA in rats with remnant kidneys
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The changes in the expression of cardiac bradykinin B2 receptors (BKB2Rs) and endogenous nitrix oxide synthase (eNOs) mRNA were studied in rats with remnant kidneys. Thirty-two rats were divided into sham-operated and experimental groups randomly (n=16 in each group). The remnant kidney model was established by 2-stage 5/6 nephrectomy. Blood pressure and serum Cr were measured before operation and 15, 30, 60, 120 days after 5/6 nephrectomy. Eight animals in each group were killed at the first month and 4th month after the operation. The expression of BKB2Rs and eNOs mRNAs was detected by using RT-real time PCR from isolated left ventricle, and their correlation was also analyzed. The results showed that blood pressure and serum Cr were increased significantly 15 days after 5/6 nephrectomy (bothP<0.01), and the hypertension and azomia existed constantly till 120 days but had no significant fluctuation. Cardiac BKB2Rs and eNOs mRNA was declined time-dependently (bothP<0.05). And there was a close positive correlation between cardiac BKB2Rs and eNOs mRNA (r=0.82,P<0.01). It was suggested that a significant chronic renal failure can be produced at least 15 days after 5/6 nephrotomy and can sustain more than 4 months. The expression of BKB2Rs and eNOs was down-regulated time-dependently in this model, and there was a significant correlation between them.
Key wordsbradykinin B2 receptors endogenous nitric oxide synthase myocardium 5/6 nephretomy
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