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Title: Cell-specific activation profile of extracellular signal-regulated kinase 1/2, Jun N-terminal kinase, and p38 mitogen-activated protein kinases in asthmatic airways. Author: Liu W, Liang Q, Balzar S, Wenzel S, Gorska M, Alam R. Journal: J Allergy Clin Immunol; 2008 Apr; 121(4):893-902.e2. PubMed ID: 18395552. Abstract: BACKGROUND: Many airway cells manifest signs of chronic activation in asthma. The mechanism of this chronic activation is unknown. OBJECTIVES: We sought to study the activation of the mitogen-activated protein kinase (MAPK) signaling pathway in airway cells. METHODS: Endobronchial biopsy specimens from patients with severe and mild asthma (n = 17 in each group) and healthy control subjects (n = 15) were analyzed for the phosphorylated MAPKs extracellular signal-regulated kinase (ERK) 1/2, p38, and Jun N-terminal kinase (JNK) and their downstream effectors by means of immunofluorescence staining. Airway epithelial activation of ERK1/2 and p38 was studied by using Western blotting. Epithelial function was studied by means of real-time PCR, ELISA, and the thymidine incorporation assay. RESULTS: We detected strong phospho-ERK1/2 staining in airway epithelium and smooth muscle cells in biopsy specimens from asthmatic patients. Fluorescent areas per image, as well as mean fluorescence intensity, were significantly (P < .0001) different among the 3 study groups (patients with severe asthma, patients with mild asthma, and healthy control subjects). Patients with severe asthma also demonstrated strong phospho-p38 staining, mostly in epithelial cells, which was significantly different from that in patients with mild asthma (P = .0001) and healthy control subjects (P = .02). Phospho-JNK primarily stained airway smooth muscle cells. Healthy subjects showed the highest intensity of phospho-JNK staining compared with that seen in patients with severe (P = .004) and mild asthma (P = .003). Inhibition of ERK1/2 and p38 in primary airway epithelial cells blocked their proliferation and expression of select, but not all, chemokines. CONCLUSIONS: Significant phosphorylation of ERK1/2 and p38 and their correlation with disease severity suggests that the foregoing signaling pathways play an important role in asthma. The ERK1/2 and p38 pathways regulate epithelial cell secretory function and proliferation.[Abstract] [Full Text] [Related] [New Search]