Abstract
Based on the controversy about the relevance of cyclooxygenase-2 (Cox-2)-derived prostanoids from the macula densa for the control of the renin system, this study aimed to determine the interrelation between Cox-2 and renin expression in the mouse kidney. In control mice renin mRNA was readily detectable whilst renocortical Cox-2 mRNA abundance was at the detection limit of the RNase protection assay and no specific signals for Cox-2 were obtained by in situ hybridization or Western blot analysis. Experimental maneuvers such as low-salt diet, treatment with loop diuretics or angiotensin I converting enzyme inhibitors clearly increased renin mRNA abundance up to sevenfold, but under none of these conditions renocortical Cox-2 mRNA levels were significantly changed. Moreover, the strong stimulation of renin expression by angiotensin I-converting enzyme inhibition was not changed by the cyclooxygenase inhibitor ibuprofen, which in turn clearly lowered tissue prostanoid content. Our data suggest a marked divergence of renin and Cox-2 expression in the kidney cortex of C57Bl/6 mice with no clear evidence for a role of Cox-2-derived prostanoids from the macula densa in the regulation of renin expression.
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Acknowledgements
The skillful assistance provided by Marie-Luise Schweiger is gratefully acknowledged. The work was financially supported by grants from the Deutsche Forschungsgemeinschaft (Ku859/12-2).
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Wagner, C., Vitzthum, H., Castrop, H. et al. Differential regulation of renin and Cox-2 expression in the renal cortex of C57Bl/6 mice. Pflugers Arch - Eur J Physiol 447, 214–222 (2003). https://doi.org/10.1007/s00424-003-1157-1
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DOI: https://doi.org/10.1007/s00424-003-1157-1