Содержание NCAM в головном мозге и поджелудочной железе крыс в условиях эндогенной интоксикации при экспериментальном хроническом панкреатите
Content of NCAM in the brain and pancreas of rats in response to endointoxication under conditions of experimental chronic pancreatitis

Summary/Abstract: The study was undertaken to examine the influence of chronic pancreatitis on the distribution of neuronal cell adhesion molecule (NCAM) in the pancreas and various brain regions of rats under the conditions of endogenous intoxication. The study was conducted using 36 white nonlinear male rats (6 months old, 190–220 g). To develop the state of chronic pancreatitis, animals were subjected to laparotomy under general anesthesia and prolonged occlusion of the pancreatic duct. The morphological examination of pancreatic tissue has been performed to confirm the chronic pancreatitis development in animals. Biochemical evaluation of the pancreatic fibrosis has been performed by measuring plasma levels of hyaluronic acid, hydroxyproline and protein-free hydroxyproline. The intensity of free radical oxidation has been assessed by the change in the concentration of TBA-active products in plasma. The level of endotoxemia has been determinedby the content of average weight molecules in plasma. Protein fractions were extracted from the pancreas and various parts of the rat brain and the levels of soluble (sNCAM) and membrane (mNCAM) proteins were studied with the use of the competitive ELISA. Total protein in the obtained fractions was measured by the Bradford assay. Occlusion of the pancreatic duct resulted in significant atrophy of acinar tissue, fibrosis and disfunction of the pancreas along with the decreasing in the antioxidant defense of animals. The present study shows developing of endointoxication in experimental rats, signified by considerable increase of molecules with average weight in plasma due to the activation of lipid peroxidation. It was established that, as a result of the experimental pancreas dysfunction, significant redistribution of soluble and membrane forms of NCAM took place, more especially in the cerebellum and thalamus of rats; it caused changing of cell-cell adhesion in these brain regions. Multidirectional NCAM distribution in the cerebellum and thalamus gives evidence of neuroplasticity as specific adaptation under conditions of chronic pancreatitis.

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