Abstract
Inhalation of cadmium can lead to development of inflammatory airway diseases such as acute pulmonary edema and chronic obstructive pulmonary disease. In inflammatory airway diseases, expression of mucins is increased, which leads to increased morbidity and mortality of the affected patients. However, no study on the effect of cadmium on expression of mucin genes in airway epithelial cells has been reported. Therefore, this study was conducted in order to investigate the effect and the brief signaling pathway of cadmium on expression of mucin genes in human airway epithelial cells. In mucin-producing human NCI-H292 airway epithelial cells and primary cultures of normal nasal epithelial cells, the effect and signaling pathway of cadmium on expression of mucin genes were investigated using reverse transcription-polymerase chain reaction (RT-PCR), real-time PCR, enzyme immunoassay, and immunoblot analysis with several specific inhibitors and small interfering RNA (siRNA). Cadmium increased mucin 8 (MUC8) expression and Toll-like receptor (TLR) 4 messenger RNA (mRNA) expression. Cadmium significantly activated phosphorylation of extracellular signal related kinase 1/2 (ERK1/2) mitogen-activated protein kinase (MAPK) and p38 MAPK. E...Continue Reading
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