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- W2017201526 abstract "The genetic contribution to salt-sensitivity in hypertension remains unclear. We have previously identified a quantitative trait locus on chromosome 2 in stroke-prone spontaneously hypertensive rats (SHRSPs) responsible for an increase in SBP in response to a salt challenge. This response is blunted in the congenic SHRSP strain with the Wistar-Kyoto (WKY) chromosome 2 region (10 cM) introgressed (SP.WKYGla2k). We aimed to discover the mechanisms that underlie the effects of this region on salt-handling in the SHRSP strain.Renal and adreno-cortical function were compared in the WKY, SHRSP and the congenic SP.WKYGla2k strains.In response to the salt challenge, all strains excreted more sodium, but the SHRSP strain excreted more protein and a greater amount of sodium compared with either the WKY or the SP.WKYGla2k strain (0.19 ± 0.02 vs. 0.12 ± 0.01 g/24 h and 0.09 ± 0.02 g/24 h, respectively). Glomerular filtration was not affected by diet or genotype, but renal plasma flow was decreased in the SP.WKYGla2k and SHRSP strains. The SHRSP strain had higher plasma aldosterone in association with greater adrenal CYP11B2 (aldosterone synthase) and 3β hydroxysteroid dehydrogenase mRNA gene expression when compared to the WKY strain. Strikingly, introgression of the WKY chromosome 2 region into the SHRSP strain corrected the proteinuria and reduced sodium excretion, plasma aldosterone levels and 3β hydroxysteroid dehydrogenase mRNA gene expression in response to the salt challenge when compared to the SHRSP strain. Glucocorticoid levels and markers of glucocorticoid synthesis were unaffected.Our findings suggest that introgression of the chromosome 2 congenic interval from the WKY into the SHRSP strain is associated with restored aldosterone regulation sufficient to reduce salt-sensitive hypertension and proteinuria." @default.
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- W2017201526 date "2014-10-01" @default.
- W2017201526 modified "2023-09-26" @default.
- W2017201526 title "Introgressed chromosome 2 quantitative trait loci restores aldosterone regulation and reduces response to salt in the stroke-prone spontaneously hypertensive rat" @default.
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- W2017201526 doi "https://doi.org/10.1097/hjh.0000000000000300" @default.
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