Correlation study between the expression of dopamine receptor in brain and the pancreatic encephalopa-thy

CHEN Rong; WANG Jing; TANG Yong; YU Chonglin

doi:10.3969/j.issn.1006-5725.2017.18.009

Abstract：Objective To investigate the expression of dopamine receptor in brain of rats with pancreatic encephalopathy and provide a theoretical basis to reveal pathogenesis of pancreatic encephalopathy. Methods A rat model of experimental pancreatic encephalopathy was induced by retrograde injection of 5％sodium taurocholate into the pancreatic duct. The pathological changes of pancreas and brain were detected. The water content in brain tissue was determined. The superoxide dismutase activity and malondialdehyde content in brain tissue homogenate were detected by the chemical colorimetry. Levels of TNF-α,IL-1β,tyrosine hydroxylase and dopamine receptor-2 were detected by immunohistochemistry(SP method). Results Cerebral sulcus was shallow,ventricle was small-er and the superficial veins were dilated and congested. The inflammatory cell infiltration and pancreatic acinar cell necrosis in the pancreas and neuron edema ,inflammatory cell infiltration ,microvessel adherent leukocytes in brain were observed by light microscope in model groups at 3,6,12 hours. Compared with the control group. The activities of superoxide dismutase in brain tissue in model groups at 3,6,12 hours were significantly decreased (P < 0.01). The level of malondialdehyde and the water content of brain tissue were significantly increased (P <0.01 ,respectively). Compared with the control group ,levels of brain TNF-α,IL-1β,tyrosine hydroxylase and dopamine receptor-2 in model groups at 3,6,12 hours were significantly increased(P < 0.01,respectively).Conclusions The incidence of pancreatic encephalopathy may be related to the influx of oxygen free radical and inflammatory factors,invading nerve center by blood-brain barrier and inducing the increased production of dopa-mine and the upregulation of dopamine receptor in brain.