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Connexin Hemichannels Contribute to the Activation of cAMP Signaling Pathway and Renin Production.

Abstract：

:Connexin hemichannels play an important role in the control of cellular signaling and behaviors. Given that lowering extracellular Ca2+, a condition that activates hemichannels, is a well-characterized stimulator of renin in juxtaglomerular cells, we, therefore, tested a potential implication of hemichannels in the regulation of renin in As4.1 renin-secreting cells. Lowering extracellular Ca2+ induced hemichannel opening, which was associated with cAMP signaling pathway activation and increased renin production. Blockade of hemichannels with inhibitors or downregulation of Cxs with siRNAs abrogated the activation of cAMP pathway and the elevation of renin. Further analysis revealed that cAMP pathway activation was blocked by adenylyl cyclase inhibitor SQ 22536, suggesting an implication of adenyl cyclase. Furthermore, the participation of hemichannels in the activation of the cAMP signaling pathway was also observed in a renal tubular epithelial cell line NRK. Collectively, our results characterized the hemichannel opening as a presently unrecognized molecular event involved in low Ca2+-elicited activation of cAMP pathway and renin production. Our findings thus provide novel mechanistic insights into the low Ca2+-initiated cell responses. Given the importance of cAMP signaling pathway in the control of multiple cellular functions, our findings also highlight the importance of Cx-forming channels in various pathophysiological situations.

journal_name

Int J Mol Sci

journal_title

International journal of molecular sciences

authors

Hong J,Yao J

doi

10.3390/ijms21124462

subject

Has Abstract

pub_date

2020-06-23 00:00:00

issue

12

issn

1422-0067

pii

ijms21124462

journal_volume

21

pub_type

杂志文章

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