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Molecular characteristics and physiological roles of Na + –K + –Cl − cotransporter 2
Author(s) -
Marcoux AndreeAnne,
Tremblay Laurence E.,
Slimani Samira,
Fiola MarieJeanne,
MacWay Fabrice,
Garneau Alexandre P.,
Isenring Paul
Publication year - 2021
Publication title -
journal of cellular physiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.529
H-Index - 174
eISSN - 1097-4652
pISSN - 0021-9541
DOI - 10.1002/jcp.29997
Subject(s) - cotransporter , chemistry , ion transporter , ion , splice , biochemistry , biophysics , membrane , sodium , biology , gene , organic chemistry
Na + –K + –Cl − cotransporter 2 (NKCC2; SLC12A1) is an integral membrane protein that comes as three splice variants and mediates the cotranslocation of Na + , K + , and Cl − ions through the apical membrane of the thick ascending loop of Henle (TALH). In doing so, and through the involvement of other ion transport systems, it allows this nephron segment to reclaim a large fraction of the ultrafiltered Na + , Cl − , Ca 2+ , Mg 2 + , and HCO 3 − loads. The functional relevance of NKCC2 in human is illustrated by the many abnormalities that result from the inactivation of this transport system through the use of loop diuretics or in the setting of inherited disorders. The following presentation aims at discussing the physiological roles and molecular characteristics of Na + –K + –Cl − cotransport in the TALH and those of the individual NKCC2 splice variants more specifically. Many of the historical and recent data that have emerged from the experiments conducted will be outlined and their larger meaning will also be placed into perspective with the aid of various hypotheses.