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2015 ; 2015
(ä): 362768
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Proinflammatory Cytokines and Potassium Channels in the Kidney
#MMPMID26508816
Nakamura K
; Hayashi H
; Kubokawa M
Mediators Inflamm
2015[]; 2015
(ä): 362768
PMID26508816
show ga
Proinflammatory cytokines affect several cell functions via receptor-mediated
processes. In the kidney, functions of transporters and ion channels along the
nephron are also affected by some cytokines. Among these, alteration of activity
of potassium ion (K(+)) channels induces changes in transepithelial transport of
solutes and water in the kidney, since K(+) channels in tubule cells are
indispensable for formation of membrane potential which serves as a driving force
for the transepithelial transport. Altered K(+) channel activity may be involved
in renal cell dysfunction during inflammation. Although little information was
available regarding the effects of proinflammatory cytokines on renal K(+)
channels, reports have emerged during the last decade. In human proximal tubule
cells, interferon-? showed a time-dependent biphasic effect on a 40?pS K(+)
channel, that is, delayed suppression and acute stimulation, and interleukin-1?
acutely suppressed the channel activity. Transforming growth factor-?1 activated
KCa3.1 K(+) channel in immortalized human proximal tubule cells, which would be
involved in the pathogenesis of renal fibrosis. This review discusses the effects
of proinflammatory cytokines on renal K(+) channels and the causal relationship
between the cytokine-induced changes in K(+) channel activity and renal
dysfunction.