Nucleotide regulation of paracellular Cl− permeability in natural rabbit airway epithelium
Nucleotide regulation of paracellular Cl− permeability in natural rabbit airway epithelium
复制标题
天然兔气道上皮细胞旁细胞 Cl− 通透性的核苷酸调节
DOI:
10.1007/s00424-005-0023-8
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发表时间:
2006
期刊:
影响因子:
--
通讯作者:
O. Frederiksen
中科院分区:
文献类型:
--
作者:
A. N. Poulsen;T. L. Klausen;P. S. Pedersen;N. Willumsen;O. Frederiksen
In this study, we demonstrate a novel regulatory mechanism by which mucosal nucleotides via P2Y receptors decrease paracellular Cl− ion permeability in natural rabbit airway epithelium (in addition to a decrease in active Na+ absorption). In contrast to primary cultures, the natural airway epithelium is a low-resistance epithelium, and an equivalent circuit model predicts that changes of more than ∼12% in transepithelial conductance (Gt) must include an effect on paracellular conductance (Gs). Mucosal P2Y receptor stimulation with uridine triphosphate (UTP; 200 μM) decreased Gt by up to 50% (average, 24%) and simultaneously decreased the paracellular Cl− permeability (mucosa-to-serosa Cl− flux) by 16%, but had no effect on mannitol permeability. The Gt response to UTP was mimicked and attenuated by ionomycin (1 μM), suggesting a dependence on Ca2+i. Amiloride (100 μM) and hyperosmolarity (+75 mM mannitol) also decreased Gt, indicating a role of cell shrinkage. Elevation of cAMP with forskolin (8 μM) or isoproterenol (10 μM) increased Gt by 55 and 32%, and forskolin increased paracellular Cl− permeability by 37% without affecting mannitol permeability. The opposite effects of Ca2+i and cAMP on Gt suggest an autocrine nucleotide signaling sequence where P2Y-dependent decrease in passive, paracellular Cl− transport is succeeded by a reversion of this effect due to P1-receptor-stimulated cAMP formation by adenosine originating from a time-dependent breakdown of mucosal ATP.
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影响因子:
5.5
作者:
Colegio, OR;Van Itallie, C;Anderson, JM
通讯作者:
Anderson, JM
DOI:
10.1152/ajplung.1990.258.6.l334
发表时间:
1990
期刊:
The American journal of physiology
影响因子:
--
作者:
McCann,JD;Matsuda,J;Garcia,M;Kaczorowski,G;Welsh,MJ
通讯作者:
Welsh,MJ
影响因子:
3.6
作者:
Brown,HA;Lazarowski,ER;Boucher,RC;Harden,TK
通讯作者:
Harden,TK
DOI:
10.1152/ajpcell.1995.269.4.c870
发表时间:
1995
期刊:
The American journal of physiology
影响因子:
--
作者:
Gorodeski,GI;DeSantis,BJ;Goldfarb,J;Utian,WH;Hopfer,U
通讯作者:
Hopfer,U
DOI:
10.1152/ajpcell.1991.261.2.c319
发表时间:
1991
期刊:
The American journal of physiology
影响因子:
--
作者:
Willumsen,NJ;Boucher,RC
通讯作者:
Boucher,RC