alexa Increased C-type natriuretic peptide mRNA expression in the kidney of diabetic rats.


Journal of Cardiovascular Diseases & Diagnosis

Author(s): Shin SJ, Wen JD, Lee YJ, Chen IH, Tsai JH

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Abstract To investigate the responsiveness of renal-synthesized C-type natriuretic peptide (CNP) to changes in water and electrolyte balance, we measured renal CNP mRNA levels, plasma CNP concentrations and urinary CNP excretion rates in streptozotocin-induced diabetic rats eating a normal (0.26\% NaCl) or low (0.04\% NaCl) salt diet. Using reverse transcription-PCR followed by Southern blot analysis, we found that renal cortical and medullary CNP mRNA levels were markedly enhanced in diabetic rats from the 14th day and remained enhanced with an accompanying elevation of urinary CNP excretion rates for the entire 60-day study period. All increases of renal CNP mRNA and urinary CNP excretion rates in diabetic rats were attenuated in low salt diet-treated diabetic rats as well as insulin-treated diabetic rats. These results demonstrate that renal CNP synthesis is enhanced in diabetic rats and the increase of renal CNP mRNA is ameliorated by salt restriction and insulin treatment. These results imply that renal-synthesized CNP is responsive to the alteration of water and electrolyte homeostasis in diabetic rats.
This article was published in J Endocrinol and referenced in Journal of Cardiovascular Diseases & Diagnosis

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