Abstract
Type 2 Diabetes mellitus (T2DM) is characterized by peripheral insulin resistance, impaired insulin secretion, and reduced β-cell mass. Mechanisms that underlie β-cell failure include glucotoxicity, lipotoxicity, endoplasmic reticulum (ER) stress, and oxidative stress. This study was designed to assess the protective effect of trigonelline and diosgenin against changes in ER stress-associated apoptotic proteins CHOP, Caspase12, and Caspase3 and antioxidant levels in pancreas as well as adipose tissue PPARγ mRNA in T2DM rats. Markers of diabetes and obesity such as serum glucose, insulin, free fatty acid (FFA), TNF-α, IL-6, and leptin were also assessed. T2DM rats showed significantly elevated levels of pancreatic ER stress proteins and lipid peroxidation, while the antioxidants were significantly reduced. Histological examination also confirmed T2DM-associated damage in pancreas. In addition, a significant increase in serum FFA, TNF-α, IL-6, and decrease in leptin levels along with significantly decreased adipose mass and reduced PPARγ expression were observed in T2DM rats. On the other hand, trigonelline and diosgenin treatment independently brought about significant improvement in serum parameters, decrease in apoptotic ER stress proteins, and reinforced antioxidant status in pancreas. Histological examination of pancreas showed normal morphology. Treated groups also showed increased adipose tissue mass and enhanced PPARγ expression. Data from docking studies indicated good interaction of both compounds with PPARγ, and diosgenin showed better binding efficiency. These findings suggest that the insulin-sensitizing effects of trigonelline and diosgenin are mediated through moderation of ER stress and oxidative stress in pancreas as well as by PPARγ activation in adipose tissue.
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Abbreviations
- CHOP:
-
CCAAT/enhancer-binding protein (C/EBP) homologous protein (CHOP)
- CPCSEA:
-
Control and supervision of Experiments on Animals
- eIF2a:
-
Eukaryotic initiation factor 2a
- ELISA:
-
Enzyme-linked immunosorbent assay
- ER:
-
Endoplasmic reticulum
- ERO1:
-
Endoplasmic reticulum oxidoreductin 1
- FFA:
-
Free fatty acid
- GADD34:
-
Growth arrest and DNA damage-inducible protein 34
- GOD–PAP:
-
Glucose oxidase–phenol + aminophenazone
- GPx:
-
Glutathione peroxidase
- GSH:
-
Reduced glutathione
- H&E:
-
Haematoxylin and eosin
- HFD:
-
High-fat diet
- HOMA-B:
-
Homeostasis model assessment of β‐cell function
- HOMA-IR:
-
Homeostasis model assessment of insulin resistance
- IL-6:
-
Interleukin-6
- LPO:
-
Lipid peroxidation
- NBF:
-
Neutral buffered formaline
- NPD:
-
Normal pelleted diet
- PDI:
-
Protein disulfide isomerase
- PPARγ:
-
Peroxisome proliferated-activated receptor γ
- PUFA:
-
Polyunsaturated fatty acid
- QUICKI:
-
Quantitative insulin sensitivity check index
- ROS:
-
Reactive oxygen species
- SDS-PAGE:
-
Sodium dodecyl sulfate polyacrylamide gel electrophoresis
- SOD:
-
Superoxide dismutase
- STZ:
-
Streptozotocin
- T2DM:
-
Type 2 diabetes mellitus
- TBS:
-
Tris buffered saline
- TMB/H2O2 :
-
3,3′,5,5′-Tetramethylbenzidine/hydrogen peroxide
- TNF-α:
-
Tumor necrosis factor-α
- UPR:
-
Unfolded protein response
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Acknowledgments
The financial support provided by the University Grants Commission, India, [MRP F. No. 36-191/2008(SR)] and the DST-FIST support is gratefully acknowledged.
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We hereby state that we do not have any conflict of interest in the present work.
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Tharaheswari, M., Jayachandra Reddy, N., Kumar, R. et al. Trigonelline and diosgenin attenuate ER stress, oxidative stress-mediated damage in pancreas and enhance adipose tissue PPARγ activity in type 2 diabetic rats. Mol Cell Biochem 396, 161–174 (2014). https://doi.org/10.1007/s11010-014-2152-x
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DOI: https://doi.org/10.1007/s11010-014-2152-x