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    Hepatoprotective Effects of Curcumin on Liver Injury in Streptozocin-induced Diabetic Rats
    (Wolters Kluwer Medknow Publications, 2024) Ozkaptan, Bilge Bal; Sagir, Dilek; Aksoy, Fatma
    Introduction: Type 2 diabetes mellitus is characterized by chronically elevated blood sugar levels associated with disruption of the inflammatory and oxidative state and dyslipidemia. Curcumin is a highly pleiotropic molecule with hypoglycemic, hypolipidemic, anti-inflammatory, and antioxidant properties. The aim of this study was to evaluate the effects of curcumin on the liver of streptozotocin-induced diabetic rats. Materials and Methods: Thirty-two adult male rats were used in the study. The rats were divided into four groups: Control (C), Diabetes (D), Curcumin (CUR), and Diabetes + Curcumin (D + CUR) (n = 8). The groups given curcumin were given 60 mg/kg curcumin by gavage once a day during the 14-day study period. At the end of the experiment, biochemical, stereological, histological, and immunohistochemical analyses were performed on blood and liver samples taken from rats sacrificed. Results: After curcumin treatment in diabetic rats, there was a significant decrease in blood glucose levels, hepatic markers, and levels of thiobarbituric acid reactive substances (P < 0.01). Furthermore, a significant increase in enzymatic antioxidants such as superoxide dismutase, catalase, and glutathione peroxidase was observed after treatment (P < 0.01). It was determined that curcumin decreased the apoptotic index and the number of dual-nucleated hepatocytes in the liver, and provided support for liver regeneration (P < 0.01). Discussion and Conclusion: Based on the findings of this study, it can be concluded that curcumin has the potential to protect against hyperglycemia-induced oxidative stress and apoptosis in liver cells, and also induces regeneration in damaged liver.
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    Protective Effect of Curcumin Against Pancreatic Islet Injury in Streptozocin Induced Type 2 Diabetic Rats: An Experimental Study
    (2022) Özkaptan, Bilge Bal; Sağır, Dilek; Aksoy, Fatma
    Objective: The aim of study of was to determine the damage caused by streptozocin (STZ)-induced Type 2 diabetes in pancreatic islet in rats and the effect of curcumin on this damage. Material and Methods: A total of 32 (250-320 g) Wistar albino male rats were used. Rats were randomly divided into 4 groups as Control (C), Diabetes (DM), Curcumin (CUR), and Diabetes+Curcumin (DM+CUR) (n=8). Histopathological, stereological and immunohistochemical analyzes were used to determine the damage caused by type 2 diabetes in the pancreatic tissue and the effect of curcumin on this damage. Results: In the histopathological evaluation of pancreatic tissues, in pancreatic sections of DM group rats, the islets were smaller and their borders were irregular, and degenerative and necrotic changes were observed in the cells. In the DM+CUR group, it was determined that these degenerative changes in the islets of Langerhans and cells were alleviated. In the stereological analysis, it was determined that the islet volume, the ratio of islets to the pancreas and the number of beta cells in the DM group were statistically significantly decreased compared to the other groups, and it was found to be higher in the DM+CUR group than in the DM group (p<0.05). In the immunohistochemical evaluation, the C and CUR groups showed similar staining with Ki67, whereas the staining was less in the diabetic group. In the diabetes group treated with curcumin, it was found that curcumin attenuated the diabetes- related Ki67 reduction. Conclusion: In this study, it was determined that curcumin reduced the damage in the islets and beta cells in the pancreas of rats with diabetes mellitus with STZ and provided a significant protection in the pancreatic tissue.