Abstract:
PURPOSE:To study the expression of P-glycoprotein (P-gp), lung resistance-related protein (LRP), and caveolin-1 (cav-1) in the human bronchial epithelial cell line 16HBE14o-. METHODS:The presence of P-gp, LRP, and cav-1 in 16HBE14o- cell layers was evaluated using immunocytochemical staining and visualization with confocal laser scanning microscopy (CLSM). Functionality of P-gp was determined by bidirectional transport of rhodamine-123 with and without a P-gp inhibitor, verapamil. Caveolae were visualized using transmission electron microscopy (TEM). Flux of fluorescein-Na was also studied as a paracellular transport marker. RESULTS:Immunocytochemical staining showed expression of P-gp localized at the apical membrane of 16HBE14o- cell layers. The flux of rhodamine 123 across cell layers exhibited a greater Papp value for the secretory (i.e., basolateral-to-apical) direction. This asymmetry disappeared in the presence of verapamil. CLSM provided evidence for the expression of LRP and cav-1. TEM further showed typically shaped caveolae at the apical and basolateral membranes. CONCLUSION:Cell layers of 16HBE14o- express drug transport systems that are also present in the human bronchus in vivo, indicating that the 16HBE14o- cell line may be a suitable candidate for an in vitro model for mechanistic studies of drug transport processes involved in the smaller airways.
journal_name
Pharm Resjournal_title
Pharmaceutical researchauthors
Ehrhardt C,Kneuer C,Laue M,Schaefer UF,Kim KJ,Lehr CMdoi
10.1023/a:1023230328687subject
Has Abstractpub_date
2003-04-01 00:00:00pages
545-51issue
4eissn
0724-8741issn
1573-904Xjournal_volume
20pub_type
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journal_title:Pharmaceutical research
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journal_title:Pharmaceutical research
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更新日期:2003-11-01 00:00:00
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更新日期:2016-06-01 00:00:00
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更新日期:2013-09-01 00:00:00
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更新日期:2001-08-01 00:00:00
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journal_title:Pharmaceutical research
pub_type: 杂志文章
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更新日期:1995-11-01 00:00:00
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journal_title:Pharmaceutical research
pub_type: 杂志文章
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更新日期:1996-12-01 00:00:00
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更新日期:2010-01-01 00:00:00
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更新日期:1999-06-01 00:00:00