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Human aquaporins : regulators of transcellular water flow

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Day, Rebecca E., Kitchen, Philip, Owen, David S., Bland, Charlotte, Marshall, Lindsay, Conner, Alex C., Bill, Roslyn M. and Conner, Matthew T. (2014) Human aquaporins : regulators of transcellular water flow. Biochimica et Biophysica Acta (BBA) - General Subjects, Volume 1840 (Number 5). pp. 1492-1506. doi:10.1016/j.bbagen.2013.09.033 ISSN 0304-4165.

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Official URL: http://dx.doi.org/10.1016/j.bbagen.2013.09.033

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Abstract

Background
Emerging evidence supports the view that (AQP) aquaporin water channels are regulators of transcellular water flow. Consistent with their expression in most tissues, AQPs are associated with diverse physiological and pathophysiological processes.

Scope of review
AQP knockout studies suggest that the regulatory role of AQPs, rather than their action as passive channels, is their critical function. Transport through all AQPs occurs by a common passive mechanism, but their regulation and cellular distribution varies significantly depending on cell and tissue type; the role of AQPs in cell volume regulation (CVR) is particularly notable. This review examines the regulatory role of AQPs in transcellular water flow, especially in CVR. We focus on key systems of the human body, encompassing processes as diverse as urine concentration in the kidney to clearance of brain oedema.

Major conclusions
AQPs are crucial for the regulation of water homeostasis, providing selective pores for the rapid movement of water across diverse cell membranes and playing regulatory roles in CVR. Gating mechanisms have been proposed for human AQPs, but have only been reported for plant and microbial AQPs. Consequently, it is likely that the distribution and abundance of AQPs in a particular membrane is the determinant of membrane water permeability and a regulator of transcellular water flow.

General significance
Elucidating the mechanisms that regulate transcellular water flow will improve our understanding of the human body in health and disease. The central role of specific AQPs in regulating water homeostasis will provide routes to a range of novel therapies. This article is part of a Special Issue entitled Aquaporins.

Item Type: Journal Article
Subjects: Q Science > QP Physiology
Divisions: Faculty of Science, Engineering and Medicine > Research Centres > Molecular Organisation and Assembly in Cells (MOAC)
Library of Congress Subject Headings (LCSH): Aquaporins, Homeostasis, Body fluid flow
Journal or Publication Title: Biochimica et Biophysica Acta (BBA) - General Subjects
Publisher: Elsevier Science BV
ISSN: 0304-4165
Official Date: May 2014
Dates:
DateEvent
May 2014Published
23 September 2013Accepted
5 July 2013Submitted
Volume: Volume 1840
Number: Number 5
Page Range: pp. 1492-1506
DOI: 10.1016/j.bbagen.2013.09.033
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access (Creative Commons)
Date of first compliant deposit: 29 December 2015
Date of first compliant Open Access: 29 December 2015
Funder: Biotechnology and Biological Sciences Research Council (Great Britain) (BBSRC), Biomedical Research Centre-Sheffield Hallam University

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