Cadmium induces mucin 8 expression via Toll-like receptor 4-mediated extracellular signal related kinase 1/2 and p38 mitogen-activated protein kinase in human airway epithelial cells

2016 ◽  
Vol 6 (6) ◽  
pp. 638-645 ◽  
Author(s):  
Si-Youn Song ◽  
Chang Hoon Bae ◽  
Yoon Seok Choi ◽  
Yong-Dae Kim
Keyword(s):  
Protein Kinase ◽  
Epithelial Cells ◽  
Airway Epithelial Cells ◽  
Mitogen Activated Protein Kinase ◽  
Airway Epithelial ◽  
Toll Like Receptor ◽  
Toll Like Receptor 4 ◽  
Human Airway ◽  
Extracellular Signal ◽  
Mitogen Activated Protein

High Concentration of Insulin Induces MUC5AC Expression via Phosphoinositide 3 Kinase/AKT and Mitogen-activated Protein Kinase Signaling Pathways in Human Airway Epithelial Cells

2018 ◽  
Vol 32 (5) ◽  
pp. 350-358 ◽  
Author(s):  
Hyung Gyun Na ◽  
Yong-Dae Kim ◽  
Chang Hoon Bae ◽  
Yoon Seok Choi ◽  
Hyun Jung Jin ◽  
...  
Keyword(s):  
Protein Kinase ◽  
Epithelial Cells ◽  
Signaling Pathway ◽  
Airway Epithelial Cells ◽  
Mitogen Activated Protein Kinase ◽  
Airway Epithelial ◽  
High Concentration ◽  
Human Airway ◽  
Mitogen Activated Protein ◽  
Phosphoinositide 3 Kinase

Background Insulin is involved in a glucose homeostatic regulation and a cellular metabolism via phosphorylation of phosphoinositide 3 kinase (PI3K) pathway and mitogen-activated protein kinase (MAPK) pathway. Hyperinsulinemia reduces insulin sensitivity and is an obvious potential factor affecting airway inflammation in chronic airway diseases. MUC5AC is a major secreted mucin, which plays a critical role in inflammatory response in the respiratory tract. However, the relationship between insulin and MUC5AC expression has not been studied. Objective This study investigated the effect and the brief signaling pathway of high concentration of insulin (HI) on MUC5AC expression in human airway epithelial cell. Methods In NCI-H292 cells and primary cultures of normal nasal epithelial cells, the effect and signaling pathway of HI on MUC5AC expression were investigated using reverse transcriptase-polymerase chain reaction (RT-PCR), real-time PCR, enzyme immunoassay, and immunoblot analysis with several specific inhibitors and small interfering RNA (siRNA). Results HI significantly increased MUC5AC expression and activated PI3K/AKT, extracellular signal-related kinase 1/2 (ERK1/2) and p38 MAPKs. The specific PI3K and AKT inhibitor as well as knockdown of AKT1 and AKT2 by the respective siRNAs significantly blocked HI-mediated expression of MUC5AC. Meanwhile, the specific ERK1/2 MAPK and p38 MAPK inhibitor as well as knockdown of ERK1, ERK2, and p38 MAPK by the respective siRNAs also attenuated HI-induced expression of MUC5AC. Conclusion The results of this study suggest that HI induces MUC5AC expression via PI3K/AKT and MAPK signaling pathways in human airway epithelial cells.

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