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Transcriptomic analysis reveals inflammatory and metabolic pathways that are regulated by renal perfusion pressure in the outer medulla of Dahl-S rats. Physiol Genomics 2018 Jun 01;50(6):440-447 PMID: 29602296 PMCID: PMC6032288

Pubmed ID

29602296

DOI

10.1152/physiolgenomics.00034.2018

Abstract

Studies exploring the development of hypertension have traditionally been unable to distinguish which of the observed changes are underlying causes from those that are a consequence of elevated blood pressure. In this study, a custom-designed servo-control system was utilized to precisely control renal perfusion pressure to the left kidney continuously during the development of hypertension in Dahl salt-sensitive rats. In this way, we maintained the left kidney at control blood pressure while the right kidney was exposed to hypertensive pressures. As each kidney was exposed to the same circulating factors, differences between them represent changes induced by pressure alone. RNA sequencing analysis identified 1,613 differently expressed genes affected by renal perfusion pressure. Three pathway analysis methods were applied, one a novel approach incorporating arterial pressure as an input variable allowing a more direct connection between the expression of genes and pressure. The statistical analysis proposed several novel pathways by which pressure affects renal physiology. We confirmed the effects of pressure on p-Jnk regulation, in which the hypertensive medullas show increased p-Jnk/Jnk ratios relative to the left (0.79 ± 0.11 vs. 0.53 ± 0.10, P < 0.01, n = 8). We also confirmed pathway predictions of mitochondrial function, in which the respiratory control ratio of hypertensive vs. control mitochondria are significantly reduced (7.9 ± 1.2 vs. 10.4 ± 1.8, P < 0.01, n = 6) and metabolomic profile, in which 14 metabolites differed significantly between hypertensive and control medullas ( P < 0.05, n = 5). These findings demonstrate that subtle differences in the transcriptome can be used to predict functional changes of the kidney as a consequence of pressure elevation.

Author List

Evans LC, Dayton A, Yang C, Liu P, Kurth T, Ahn KW, Komas S, Stingo FC, Laud PW, Vannucci M, Liang M, Cowley AW Jr

Authors

Kwang Woo Ahn PhD Associate Professor in the Institute for Health and Equity department at Medical College of Wisconsin
Allen W. Cowley Jr PhD Professor in the Physiology department at Medical College of Wisconsin
Purushottam W. Laud PhD Professor in the Institute for Health and Equity department at Medical College of Wisconsin
Mingyu Liang PhD Center Director, Professor in the Physiology department at Medical College of Wisconsin
Pengyuan Liu PhD Adjunct Associate Professor in the Physiology department at Medical College of Wisconsin




Scopus

2-s2.0-85051123417
jenkins-FCD Prod-321 98992d628744e349846c2f62ac68f241d7e1ea70