Zou S, Tian FZ, Tang LJ, Li DX, Wang T, Shi L. Early growth response factor 1 expression in rat lungs and alveolar macrophages during acute pancreatitis.
Shijie Huaren Xiaohua Zazhi 2007;
15:3690-3696. [DOI:
10.11569/wcjd.v15.i35.3690]
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Abstract
AIM: To investigate the possible role of early growth response factor 1 (EGR-1) in a rat model of lung injury complicated by taurocholate sodium-induced acute pancreatitis.
METHODS: Forty male Wistar rats were randomly divided into four groups. Normal saline was injected into the common bile duct (CBD) of rats in group A, and taurocholate sodium was injected into the CBD of rats in groups B, C and D. Three hours after injection, all animals were sacrificed, and blood, pancreas and lungs were harvested. Serum levels of tumor necrosis factor (TNF)-α and interleukin (IL)-1β were measured. Pathological scoring of the pancreas was analyzed, and the pulmonary wet to dry weight ratio was measured. Immunohistochemical staining of EGR-1 on lung paraffin sections was observed and assayed semi-quantitatively. Immunocytochemical staining of EGR-1 of AMs was observed and assayed semi-quantitatively, and the concentration of TNF-α and IL-1β in culture fluid was measured. AMs were divided into four groups and treated with elastase as above. EGR-1, TNF-α and IL-1β mRNA expressions were assessed using RT-PCR.
RESULTS: Pulmonary positive staining of EGR-1 was more intense in the model of severe acute pancreatitis. Furthermore, EGR-1 staining differed among acute pancreatitis models with different severities. EGR-1 expressed in lungs correlated with the parameters that demonstrated pancreatitis severity and pulmonary injury: pathological scoring of pancreatitis (r = 0.59), pulmonary wet to dry weight ratio (r = 0.61), and serum TNF-α (r = 0.63) and IL-1β (r = 0.58). EGR-1 protein and mRNA expressed in AMs were correlated with the TNF-α and IL-1β protein (r = 0.64, 0.51, P < 0.01) and mRNA levels (r = 0.62, 0.59, P < 0.01), and were partly dependent on the ERK 1/2 pathway.
CONCLUSION: EGR-1 may play an important role in lung injury during acute pancreatitis, and the possible mechanism relates to its mediation of production of inflammatory cytokines.
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