Online ISSN : 1884-6440
Print ISSN : 0385-1036
ISSN-L : 0385-1036
高野 幹久湯元 良子
ジャーナル オープンアクセス

2011 年 36 巻 4 号 p. 145-153


The lung is expected as a promising administration route for protein and peptide drugs. However, information concerning alveolar absorption mechanisms of these high molecular weight drugs is lacking. The alveolar region of the lung is lined with a continuous epithelium comprising of type I and type II epithelial cells, and squamous type I cells cover 90~95% and cuboidal type II cells cover 5~10% of the alveolar surface area. Using primary cultured alveolar type II and transdifferentiated type I cells, however, it was found that type II cells would play a significant role in albumin and insulin endocytosis from the alveolar space. Functional and siRNA studies suggest that albumin is taken up by clathrin-mediated endocytosis in type II cells, while clathrin- and caveolae-independent but dynamin-dependent pathway is involved in insulin endocytosis. The approach to enhance insulin uptake by the alveolar epithelial cells and absorption from the lung is also discussed.

© 2011 日本膜学会
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