Abstract
Fenugreek seed and some of its phytoconstituents are known to possess hypoglycemic and hypolipidemic properties but their mode of action in insulin target tissues remains to be elucidated. As hepatic insulin resistance contributes to the development of type 2 diabetes mellitus (T2DM), the protective effects of fenugreek seed extract (FSE) and two of its phytoconstituents-trigonelline and diosgenin were evaluated in T2DM rats with special focus on changes in endoplasmic reticulum (ER) stress and oxidative stress markers in liver. Trigonelline and diosgenin content in FSE were quantified by HPTLC. T2DM was induced in male Sprague–Dawley rats by feeding high-fat diet and administration of low-dose streptozotocin. T2DM rats exhibited hyperglycemia and significantly reduced serum C-peptide levels. Liver damage in T2DM rats was marked by significantly elevated levels of liver marker enzymes in serum, liver triglycerides (TGs), and reduced liver glycogen and was further confirmed by histological analysis. T2DM rats also displayed twofold–threefold increase in the levels of ER chaperones Bip, protein disulfide isomerase (PDI) as well as ER stress associated proapoptotic markers CHOP, Caspase12 and Caspase3 in liver along with elevated lipid peroxidation (LPO) and reduced antioxidant levels. Promisingly, FSE, trigonelline, and diosgenin were found to exhibit protective effects individually and brought about significant reduction in serum enzymes, liver TGs, LPO, expression of liver ER stress marker proteins, and significant increase in liver glycogen content and antioxidants. Histological analysis also supported their protective effects suggesting that FSE and its phytoconstituents alleviate T2DM associated liver damage by normalizing ER stress and oxidative stress.
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Abbreviations
- Bip:
-
Binding immunoglobulin protein
- CHOP:
-
C/EBP homologous protein
- eIF2a:
-
Eukaryotic initiation factor 2a
- ERO1:
-
Endoplasmic reticulum oxidoreductin 1
- GADD34:
-
Growth arrest and DNA damage-inducible protein 34
- GOD–PAP:
-
Glucose oxidase - phenol + aminophenazone
- GPO–PAP–ESPAS:
-
Glycerol-3-phosphate oxidase–Peroxidase and aminoantipyrine–N-ethyl-N-sulfopropyl-n-anisidine
- GRP78:
-
Glucose regulated protein 78
- JNK:
-
c-Jun N-terminal kinase
- NAFLP:
-
Nonalcoholic fatty liver
- PDI:
-
Protein disulfide isomerase
- UPR:
-
Unfolded protein response
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Acknowledgments
The financial support provided by University Grants Commission, India, and the equipment support from DST-FIST and DBT-IPLS is gratefully acknowledged. This work is supported by University Grants Commission, India. [MRP F. No. 36-191/2008(SR)].
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We hereby state that we do not have any conflict of interest in the present work.
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Mayakrishnan, T., Nakkala, J.R., Jeepipalli, S.P.K. et al. Fenugreek seed extract and its phytocompounds- trigonelline and diosgenin arbitrate their hepatoprotective effects through attenuation of endoplasmic reticulum stress and oxidative stress in type 2 diabetic rats. Eur Food Res Technol 240, 223–232 (2015). https://doi.org/10.1007/s00217-014-2322-9
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DOI: https://doi.org/10.1007/s00217-014-2322-9