Abstract
Diabetes mellitus (DM) has emerged as a serious public health concern, due to the high morbidity and mortality resulted from its complications, such as diabetic nephropathy, diabetic cardiovascular complication, and diabetic neuropathy, etc. In this study, we investigated the beneficial effects of sepia ink melanin (SIM) on hyperglycaemia and the restoration of diabetic symptoms in streptozotocin (STZ)-induced diabetic model mice. At first, the normal experimental mice were performed with intraperitoneal injection of STZ (40 mg (kg BW)−1) (BW, body weight) to attain diabetes and then were treated with different concentrations of SIM (120, 240 and 480 mg (kg BW)−1) for four weeks. After treatment, significant decrease in gluconeogenesis were determined, accompanied by a notable increase in both glycolysis and oxidative enzyme activities in SIM-treated groups, such as liver marker enzymes in the serum and key antioxidant enzymes in liver. qPCR results revealed the transcriptional alterations in SIM-treated groups. SIM exposure increased the expression levels of several genes related to insulin transduction and PI3K/Akt pathway, including PI3K, Akt, Irs-2, and InsR. Meanwhile, expression levels of Dicarbonyl/l-xylulose reductase (Dcxr) and UDP-glucose dehydrogenase (Ugdh), which are involved in pentose-glucuronate interconversion pathway, were also elevated in SIM-treated groups. Furthermore, histological observation results indicated that nuclear deformation and organelle dissolution were improved, thus could enhance the liver function. These results demonstrated that SIM can be effective in ameliorating diabetic symptoms and improving disease management for diabetic patients.
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Abbreviations
- SIM:
-
sepia ink melanin
- Dcxr:
-
dicarbonyl/l-xylulose reductase
- Ugdh:
-
UDP-glucose dehydrogenase
- DHI:
-
5,6-di-hydroxyindole
- DHICA:
-
5,6-dihydroxyindole-2 carboxylic acid
- ROS:
-
reactive oxygen species
- STZ:
-
streptozotocin
- ALT:
-
alanine aminotransaminase
- AST:
-
aspartate aminotransferase
- ALP:
-
alkaline phosphatase
- LD:
-
lactate dehydrogenase
- SOD:
-
superoxide dismutase
- GSH-Px:
-
glutathione peroxidase
- CAT:
-
catalase
- MDA:
-
malondialdehyde
- TEM:
-
transmission electron microscopy
- FBG:
-
fasting blood glucose
- OGTT:
-
oral glucose tolerance test
- cAMP:
-
cyclic adenosine monophosphate
- DCs:
-
dicarbonyl compounds
- AGEs:
-
advanced glycation end-products.
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Acknowledgements
This research was supported by the Natural Science Foundation of Zhejiang Province (No. LY18C190006) and sponsored by K. C. Wong Magna Fund in Ningbo University.
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Wang, X., Han, M., Dong, H. et al. Protective Effects of Sepia Ink Melanin on Hepatic Tissue in Streptozotocin-Induced Diabetic Mice. J. Ocean Univ. China 21, 1362–1372 (2022). https://doi.org/10.1007/s11802-022-5018-y
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DOI: https://doi.org/10.1007/s11802-022-5018-y