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. 1986 Nov;78(5):1311–1315. doi: 10.1172/JCI112716

Sodium regulation of angiotensinogen mRNA expression in rat kidney cortex and medulla.

J R Ingelfinger, R E Pratt, K Ellison, V J Dzau
PMCID: PMC423820  PMID: 3533999

Abstract

Rat liver angiotensinogen cDNA (pRang 3) and mouse renin cDNA (pDD-1D2) were used to identify angiotensinogen and renin mRNA sequences in rat kidney cortex and medulla in rats on high and low salt diet. Angiotensinogen mRNA sequences were present in renal cortex and medulla in apparently equal proportions, whereas renin mRNA sequences were found primarily in renal cortex. Average relative signal of rat liver to whole kidney angiotensinogen mRNA was 100:3. Densitometric analysis of Northern blots demonstrated that renal cortical angiotensinogen mRNA concentrations increased 3.5-fold (P less than 0.001) and medulla, 1.5-fold (P less than 0.005) on low sodium compared with high sodium diet, whereas renal cortex renin mRNA levels increased 6.8-fold (P less than 0.0005). Dietary sodium did not significantly influence liver angiotensinogen mRNA levels. These findings provide evidence for sodium regulation of renal renin and angiotensinogen mRNA expressions, which supports potential existence of an intrarenally regulated RAS and suggest that different factors regulate renal and hepatic angiotensinogen.

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Selected References

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