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Deprecated: Implicit conversion from float 231.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Life+Sci 2014 ; 118 (2): 255-62 Nephropedia Template TP
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Tissue-specific and time-dependent regulation of the endothelin axis by the circadian clock protein Per1 #MMPMID24721511
Richards J; Welch AK; Barilovits SJ; All S; Cheng KY; Wingo CS; Cain BD; Gumz ML
Life Sci 2014[Nov]; 118 (2): 255-62 PMID24721511show ga
Aims: The present study is designed to consider a role for the circadian clock protein Per1 in the regulation of the endothelin axis in mouse kidney, lung, liver and heart. Renal endothelin-1 (ET-1) is a regulator of the epithelial sodium channel (ENaC) and blood pressure (BP), via activation of both endothelin receptors, ETA and ETB. However, ET-1 mediates many complex events in other tissues. Main methods: Tissues were collected in the middle of murine rest and active phases, at noon and midnight, respectively. ET-1, ETA and ETB mRNA expressions were measured in the lung, heart, liver, renal inner medulla and renal cortex of wild type and Per1 heterozygous mice using real-time quantitative RT-PCR. Key findings: The effect of reduced Per1 expression on levels of mRNAs and the time-dependent regulation of expression of the endothelin axis genes appeared to be tissue-specific. In the renal inner medulla and the liver, ETA and ETB exhibited peaks of expression in opposite circadian phases. In contrast, expressions of ET-1, ETA and ETB in the lung did not appear to vary with time, but ET-1 expression was dramatically decreased in this tissue in Per1 heterozygous mice. Interestingly, ET-1 and ETA, but not ETB, were expressed in a time-dependent manner in the heart. Significance: Per1 appears to regulate expression of the endothelin axis genes in a tissue-specific and time-dependent manner. These observations have important implications for our understanding of the best time of day to deliver endothelin receptor antagonists.