Abstract:
:We investigated the regulation of Cl- secretion by adrenoceptors in polarized 16HBE14o- human bronchial epithelial cells. Treatment with the nonselective β adrenoceptor agonist isoprenaline stimulated an increase in short-circuit current (ISC ), which was inhibited by the β adrenoceptor blocker propranolol. Treatment with procaterol, an agonist specific for the β2 adrenoceptor subtype, stimulated a similar increase in ISC , which was inhibited by the β2 adrenoceptor antagonist ICI 118551. Inhibitors of cystic fibrosis transmembrane conductance regulator (CFTR) and calcium-activated Cl- channel (CaCC), but not K+ channel blockers, were able to inhibit the increase in ISC . "Trimultaneous" recording of ISC and intracellular cyclic adenosine monophosphate (cAMP) and Ca2+ levels in 16HBE14o- epithelia confirmed that the ISC induced by isoprenaline or procaterol involved both cAMP and Ca2+ signaling. Our results demonstrate that β2 adrenoceptors regulate Cl- secretion in the human airway epithelium by activating apical CFTRs and CaCCs via cAMP-dependent and intracellular Ca2+ -dependent mechanisms, respectively.
journal_name
J Cell Physioljournal_title
Journal of cellular physiologyauthors
Zhang RG,Yip CY,Pan KW,Cai MY,Ko WHdoi
10.1002/jcp.29683subject
Has Abstractpub_date
2020-11-01 00:00:00pages
8387-8401issue
11eissn
0021-9541issn
1097-4652journal_volume
235pub_type
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