Ontogeny of CLCN3 chloride channel gene expression in human pulmonary epithelium.

Ontogeny of CLCN3 chloride channel gene expression in human pulmonary epithelium.
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人肺上皮中 CLCN3 氯离子通道基因表达的个体发育。

DOI:
10.1165/ajrcmb.24.4.4114
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发表时间:
2001
影响因子:
6.4
通讯作者:
McCrayJr,PB
McCrayJr,PB
中科院分区:
医学1区
文献类型:
--
作者:
Lamb,FS;Graeff,RW;Clayton,GH;Smith,RL;Schutte,BC;McCrayJr,PB

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人胎儿支气管肺上皮细胞分泌液体,这种依赖氯离子的过程对肺的正常生长非常重要。在出生时,有一个成熟的过渡,从分泌到吸收表型。胎儿肺液体分泌所需的Cl从顶膜退出的途径尚不清楚,但被认为是独立于囊性纤维化跨膜传导调节因子。我们确定了CLCN家族的电压依赖性氯离子通道基因(CLCN 2至6,Ka和Kb)在人肺中表达的个体发生,以确定肺液体分泌的潜在途径。北方分析胎儿全肺组织仅检测到CLCN 3和CLCN 6信使RNA。核糖核酸酶保护测定证实了CLCN 3的表达,并且还揭示了CLCN 2的表达。这两个通道的表达的个体发育是相似的,在妊娠中期达到高峰,出生后下降。原位杂交定位的CLCN 2和CLCN 3的信息,以气道和远端肺上皮和肺血管。我们的结论是,CLCN 3表达在人类气道上皮细胞和表达发育调节。这些通道对肺上皮液体转运和肺发育的贡献仍有待确定。
Human fetal bronchopulmonary epithelia secrete liquid, and this chloride (Cl)-dependent process is important for normal lung growth. At the time of birth there is a maturational transition from a secretory to an absorptive phenotype. The pathways for Cl exit from the apical membrane which are required for fetal lung liquid secretion are unknown but are thought to be independent of the cystic fibrosis transmembrane conductance regulator. We determined the ontogeny of expression of the CLCN family of voltage-dependent Cl channel genes (CLCN2 through 6, Kaand Kb) in the human lung to identify potential pathways for pulmonary liquid secretion. Only CLCN3 and CLCN6 messenger RNA were detected by Northern analysis of fetal whole lung tissue. Ribonuclease protection assays confirmed the expression of CLCN3 and also revealed expression of CLCN2. The ontogeny of expression of these two channels was similar, peaking in midgestation and declining postnatally.In situhybridization localized the CLCN2 and CLCN3 messages to airway and distal pulmonary epithelia and to pulmonary blood vessels. We conclude that CLCN3 is expressed in human airway epithelia and expression is developmentally regulated. The contribution of these channels to pulmonary epithelial liquid transport and lung development remains to be determined.
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