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In Sun Park  (Park IS) 2 Articles
The Roles of Clusterin on Morphogenesis of Beta Cells During Pancreas Regeneration.
Seok Woo Hong, KC Ranjan, Song Lee, Yong Jae Shin, Bon Hong Min, In Sun Park
Korean Diabetes J. 2007;31(1):1-8.   Published online January 1, 2007
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AbstractAbstract PDF
Clusterin is a highly glycosylated heterodimeric glycoprotein that plays diverse biological roles in various organs. The secreted clusterin has been established as a major form of the protein that exerts diverse tissue effects. For instance, clusterin is known to act in cell protection through the actions of extra-cellular molecular chaperones. In the extracellular milieu, clusterin participates in specific interactions with a diverse array of native biological molecules including LRP-2 (Lipoprotein receptor-related protein 2, also known as gp330 or megalin), which is involved in ligand endocytosis at the surfaces of certain epithelia. Clusterin is expressed transiently in developing and differentiating endocrine pancreatic cells and might be involved in pancreas development. This transient expression of clusterin at specific time points of pancreas development and cell differentiation during pancreas regeneration implies that the protein is a regulatory factor for cytodifferentiation as well as for replication. A specific action of the clusterin in the reconstruction and remodeling of the endocrine pancreas has been demonstrated. It also strongly stimulates duct cell differentiation into insulin-secreting cells under in vitro culture conditions. Clusterin appears thus as a potent regulator of insulin cell morphogenesis.


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  • Effect of African Mango (Irvingia gabonesis, IGOB 131TM) Extract on Glucose Regulation in STZ-Induced Diabetes
    Yejin Ha, Minhee Lee, Han Ol Kwon, Yoo-Hyun Lee
    Journal of the Korean Society of Food Science and Nutrition.2015; 44(11): 1607.     CrossRef
Effect of Leptin on Alteration of beta-cell Mass in Rat Pancreas.
Seong Bin Hong, Yu Mi Han, Young Ju Park, Yun Joo Oe, Sung Ki Kim, Yoe Joo Kim, Moon Suk Nam, Yong Seong Kim, In Sun Park
Korean Diabetes J. 2002;26(4):253-264.   Published online August 1, 2002
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AbstractAbstract PDF
Diabetes mellitus can occur when insulin secretion and action are inadequate in relation to blood glucose level. Several experiments recently reported that leptin and pancreatic beta-cells have functional axis to interact each other. The present study was aimed to investigate the role of leptin on regulation of beta-cell mass during neonatal period when they show a dynamic growth. METHOD: Leptin was injected intraperitoneally to rat neonates for 7 days from the second day after birth. Using the pancreas of the rat pups, immunohistochemical stain, in-situ hybridization and northern blot for insulin were done for analysis of beta-cell mass as well as for insulin synthesis and secretion. In addition, PCNA (proliferating cell nuclear antigen) was examined to assess the effect of leptin on islet cell proliferation. RESULT: 1) The weight gain and blood glucose levels showed no significant difference between leptin injected groups (0.1 mg/kg, 0.5 mg/kg) and control one. 2) The weights of pancreas were not different between both group. 3) Pancreatic islets of rat who received leptin 0.5 mg/kg were reduced in area and number than those of normal pups. They also showed the decreased beta-cell number per islet compared with control as well as leptin 0.1 mg/kg injected groups (59+/-49 vs 47+/-31 vs 31+/-21 per islet, p<0.05). 4) The beta-cell mass of rat who received leptin 0.5 mg/kg decreased but there was no significant difference. 5) The mRNA expressions of insulin were not different among control, leptin 0.1 mg/kg and leptin 0.5 mg/kg group. 6) The expression of PCNA as a proliferation marker showed no difference between control and leptin injected group. CONCLUSION: These results reflected that leptin negatively regulated neonatal islet cell growth occurring in normal rat pups, and resulted to relative decrease of beta-cell number compared to the untreated control. We, therefore, suggest that leptin may play the important role in beta-cell mass during neonatal period.

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