Nucleotide regulation of paracellular Cl− permeability in natural rabbit airway epithelium

Nucleotide regulation of paracellular Cl− permeability in natural rabbit airway epithelium
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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:
Pflügers Archiv
影响因子:
--
通讯作者:
O. Frederiksen
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

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在这项研究中,我们证明了一种新的调节机制,粘膜核苷酸通过P2 Y受体降低天然兔气道上皮细胞的细胞旁Cl−离子渗透性(除了减少活性Na+吸收)。与原代培养相比,天然气道上皮是低电阻上皮,等效电路模型预测跨上皮电导(Gt)的变化超过12%必须包括对细胞旁电导(Gs)的影响。用尿苷三磷酸(UTP; 200 μM)刺激粘液P2 Y受体可使Gt降低50%(平均24%),同时使细胞旁Cl−渗透性(粘膜-浆膜Cl−通量)降低16%,但对甘露醇渗透性无影响。Gt对UTP的反应被离子霉素(1 μM)模拟和减弱,表明依赖于Ca 2 +i。阿米洛利(100 μM)和高渗(+75 mM甘露醇)也降低了Gt,表明细胞收缩的作用。用毛喉素(8 μM)或异丙肾上腺素(10 μM)升高cAMP使Gt增加55%和32%,毛喉素使细胞旁Cl−渗透性增加37%,而不影响甘露醇渗透性。Ca 2 +i和cAMP对Gt的相反作用表明了一种自分泌核苷酸信号序列,其中被动的细胞旁Cl−转运中的P2 Y依赖性减少被这种作用的逆转所取代,这是由于P1受体刺激的cAMP形成,而腺苷的形成是由粘膜ATP的时间依赖性分解引起的。
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.
DOI: 10.1152/ajpcell.00547.2002
发表时间: 2003-06-01
影响因子: 5.5
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DOI: 10.1152/ajplung.1990.258.6.l334
发表时间: 1990
期刊: The American journal of physiology
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McCann,JD;Matsuda,J;Garcia,M;Kaczorowski,G;Welsh,MJ
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有证据表明 UTP 和 ATP 通过人气道上皮细胞中常见的胞外 5-核苷酸受体调节磷脂酶 C。
DOI: --
发表时间: 1991
影响因子: 3.6
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渗透压变化调节培养的人宫颈上皮的细胞旁通透性。
DOI: 10.1152/ajpcell.1995.269.4.c870
发表时间: 1995
期刊: The American journal of physiology
影响因子: --
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Gorodeski,GI;DeSantis,BJ;Goldfarb,J;Utian,WH;Hopfer,U
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培养的人鼻上皮中的钠转运和细胞内钠活性。
DOI: 10.1152/ajpcell.1991.261.2.c319
发表时间: 1991
期刊: The American journal of physiology
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Willumsen,NJ;Boucher,RC
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