Tissue sodium excess is not hypertonic and reflects extracellular volume expansion

Rossitto, G. et al. (2020) Tissue sodium excess is not hypertonic and reflects extracellular volume expansion. Nature Communications, 11, 4222. (doi: 10.1038/s41467-020-17820-2) (PMID:32839436) (PMCID:PMC7445299)

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Abstract

Our understanding of Na+ homeostasis has recently been reshaped by the notion of skin as a depot for Na+ accumulation in multiple cardiovascular diseases and risk factors. The proposed water-independent nature of tissue Na+ could induce local pathogenic changes, but lacks firm demonstration. Here, we show that tissue Na+ excess upon high Na+ intake is a systemic, rather than skin-specific, phenomenon reflecting architectural changes, i.e. a shift in the extracellular-to-intracellular compartments, due to a reduction of the intracellular or accumulation of water-paralleled Na+ in the extracellular space. We also demonstrate that this accumulation is unlikely to justify the observed development of experimental hypertension if it were water-independent. Finally, we show that this isotonic skin Na+ excess, reflecting subclinical oedema, occurs in hypertensive patients and in association with aging. The implications of our findings, questioning previous assumptions but also reinforcing the importance of tissue Na+ excess, are both mechanistic and clinical.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Rossitto, Dr Giacomo and Samji, Dr Sheon and Delles, Professor Christian and Welsh, Dr Paul and Graham, Dr Delyth and Petrie, Professor Mark and Montezano, Dr Augusto and Touyz, Professor Rhian and Neves, Dr Karla
Authors: Rossitto, G., Mary, S., Chen, J. Y., Bodder, P., Chew, K. S., Neves, K. B., Alves, R. L., Montezano, A. C., Welsh, P., Petrie, M. C., Graham, D., Touyz, R. M., and Delles, C.
College/School:College of Medical Veterinary and Life Sciences > Institute of Cardiovascular and Medical Sciences
Journal Name:Nature Communications
Publisher:Nature Research
ISSN:2041-1723
ISSN (Online):2041-1723
Copyright Holders:Copyright © 2020 The Authors
First Published:First published in Nature Communications 11: 4222
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
190814BHF centre of excellenceRhian TouyzBritish Heart Foundation (BHF)RE/13/5/30177Institute of Cardiovascular & Medical Sciences
303944BHF Centre of ExcellenceRhian TouyzBritish Heart Foundation (BHF)RE/18/6/34217CAMS - Cardiovascular Science
300689Vascular Noxs as therapeutic targets and biomarkers in hypertensionRhian TouyzBritish Heart Foundation (BHF)CH/12/4/29762CAMS - Cardiovascular Science