Mary, S. , Boder, P., Rossitto, G., Graham, L., Scott, K. , Flynn, A., Kipgen, D., Graham, D. and Delles, C. (2021) Salt loading decreases urinary excretion and increases intracellular accumulation of uromodulin in stroke-prone spontaneously hypertensive rats. Clinical Science, 135(24), pp. 2749-2761. (doi: 10.1042/CS20211017) (PMID:34870708) (PMCID:PMC8689196)
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Abstract
Uromodulin (UMOD) is the most abundant renal protein secreted into urine by the thick ascending limb (TAL) epithelial cells of the loop of Henle. Genetic studies have demonstrated an association between UMOD risk variants and hypertension. We aimed to dissect the role of dietary salt in renal UMOD excretion in normotension and chronic hypertension. Normotensive Wistar–Kyoto rats (WKY) and stroke-prone spontaneously hypertensive rats (SHRSP) (n=8/sex/strain) were maintained on 1% NaCl for 3 weeks. A subset of salt-loaded SHRSP was treated with nifedipine. Salt-loading in SHRSP increased blood pressure (ΔSBP 35 ± 5 mmHg, P<0.0001) and kidney injury markers such as kidney injury marker-1 (KIM-1; fold change, FC 3.4; P=0.003), neutrophil gelatinase-associated lipocalin (NGAL; FC, 2.0; P=0.012) and proteinuria. After salt-loading there was a reduction in urinary UMOD excretion in WKY and SHRSP by 26 and 55% respectively, compared with baseline. Nifedipine treatment reduced blood pressure (BP) in SHRSP, however, did not prevent salt-induced reduction in urinary UMOD excretion. In all experiments, changes in urinary UMOD excretion were dissociated from kidney UMOD protein and mRNA levels. Colocalization and ex-vivo studies showed that salt-loading increased intracellular UMOD retention in both WKY and SHRSP. Our study provides novel insights into the interplay among salt, UMOD, and BP. The role of UMOD as a cardiovascular risk marker deserves mechanistic reappraisal and further investigations based on our findings.
| Item Type: | Articles |
|---|---|
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Rossitto, Dr Giacomo and Boder, Philipp and Samji, Dr Sheon and Delles, Professor Christian and Scott, Dr Kayley and Graham, Dr Lesley and Graham, Dr Delyth and Flynn, Mr Arun |
| Creator Roles: | Mary, S.Conceptualization, Resources, Data curation, Software, Formal analysis, Funding acquisition, Validation, Investigation, Visualization, Writing – original draft, Project administration, Writing – review and editing Boder, P.Software, Formal analysis, Investigation, Methodology, Writing – original draft, Writing – review and editing Rossitto, G.Conceptualization, Data curation, Software, Formal analysis, Investigation, Writing – review and editing Graham, L.Conceptualization, Writing – review and editing Scott, K.Investigation, Methodology Flynn, A.Visualization, Methodology Graham, D.Supervision, Validation, Methodology, Writing – review and editing Delles, C.Conceptualization, Resources, Data curation, Supervision, Funding acquisition, Writing – original draft, Project administration, Writing – review and editing |
| Authors: | Mary, S., Boder, P., Rossitto, G., Graham, L., Scott, K., Flynn, A., Kipgen, D., Graham, D., and Delles, C. |
| College/School: | College of Medical Veterinary and Life Sciences > School of Cardiovascular & Metabolic Health |
| Journal Name: | Clinical Science |
| Publisher: | Portland Press |
| ISSN: | 0143-5221 |
| ISSN (Online): | 1470-8736 |
| Published Online: | 06 December 2021 |
| Copyright Holders: | Copyright © 2021 The Authors |
| First Published: | First published in Clinical Science 135(24): 2749-2761 |
| Publisher Policy: | Reproduced under a Creative Commons License |
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