Korean Diabetes Journal 2001;25(2):152-163.
Published online April 1, 2001.
Effect of Probucol on the Apoptosis of Pancreatic Islet Cells in Multiple Low Dose Streptozotocin Induced Diabetic (LDSD) Mice.
Kyung Mook Choi, Dong Rim Kim, Nan Hee Kim, Chul Hwan Kim, Sei Hyun Baik, Dong Seop Choi
1Department of Internal Medicine, College of Medicine, Korea University, Seoul, Korea.
2Department of Pathology College of Medicine, Korea University, Seoul, Korea.
Abstract
BACKGROUND
Type 1 Diabetes Mellitus(DM) is consequence of pancreatic beta cell destruction by immune interactions of auto-reactive T cells and cytokines. In individuals with genetic predisposition, an environmental insult triggers immune reaction against beta cells to produce clinical type 1 DM. Since the capacity to form new beta cells from precursors and power of replication appear to be limited, the susceptibility of beta cell to death may be the major underlying variable influencing the occurrence of type 1 DM. However, the precise mechanism of beta cell death is not known. Apoptosis is a physiologic form of cell death and recent studies reported that it could play an important role in beta cell death in experimental diabetic animal models such as multiple low dose streptozotocin diabetic (LDSD) mice or non- obese diabetic (NOD) mice. Probucol is a hypocholesterolemic agent with antioxidant properties. Some studies reported that the probucol could reduce the blood glucose level in type 1 animal models but the mechanism was not known. Therefore, this study was performed to define whether the probucol could decrease the degree of hyperglycemia and the mechanism of its attenuation on the severity of pancreatic insulitis by reducing the degree of apoptosis in LDSD mice. METHODS: We performed an experimental study with male Charles-River CD-1 mice. Mice were divided into the 30 streptozotocin-induced diabetics, 30 probucol- treated streptozotocin-induced diabetics. At 1, 5, 10, 15, and 20 days after streptozotocin administration, the blood glucose level was measured and mice were sacrificed to determine the grade of insulitis and apoptosis. The numbers of apoptotic cells of pancreatic islets were compared using double staining immunohistochemical method (TUNEL and insulin antibody staining). RESULTS: The level of blood glucose and the severity of insulitis were decreased in the probucol treated LDSD mice group significantly when compared with the control LDSD mice group. The numbers of apoptotic cells of pancreatic islets were decreased in the probucol group. The appearance of apoptosis of beta cells preceded the development of insulitis in LDSD mice. CONCLUSION: Probucol can reduce blood glucose level and the severity of insulitis by the decrease of apoptosis in LDSD mice.
Key Words: Streptozotocin, Probucol, Apoptosis


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