Regulation of MUC5AC mucin production by the cell attachment dependent pathway involving integrin β1 in NCI-H292 human lung epithelial cells

Jun Iwashita, Kaori Hongo, Yuho Ito, Tatsuya Abe, Jun Murata

Faculty of Bioresource Sciences, Akita Prefectural University, Akita, Japan.

DOI: 10.4236/abc.2013.31001                

Abstract

Mucus hypersecretion in airways is a common pathological change observed in chronic inflammatory diseases and asthma. We investigated the new role of cell attachment to the extracellular matrix (ECM) on the production of the airway mucus protein, MUC5AC mucin, in human airway epithelial cells, NCI-H292. MUC5AC levels of cells cultured on low adhesion plates were 10-fold higher than those of cells cultured on adhesion plates. Cells cultured on bovine serum albumin (BSA) coated plates, which produce low adhesion conditions, also induced the up-regulation of MUC5AC. Mucin staining by PAS and MUC5AC immunodetection confirmed that mucin proteins were overproduced under low adhesion conditions. The major adhesion molecule between cells and the ECM was integrins. A time-course experiment showed that the expression patterns of integrin β1 and MUC5AC protein were inversely proportional. The inhibition of integrin β1 induced an increase in MUC5AC production in cells cultured under adhesion conditions, but not under low adhesion conditions. These results suggested that cell attachment regulates MUC5AC production, which is up-regulated by low adhesion to the ECM, and MUC5AC production is inversely proportional to the function of integrin β1.

Keywords

Asthma; Mucin; MUC5AC; Mucus; Integrin

Conflicts of Interest

The authors declare no conflicts of interest.

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