Abstract
Background
Type 2 diabetes mellitus (T2DM) is a metabolic disorder characterized by limited metabolic flexibility in the body. Such limitation implicates the pyruvate dehydrogenase kinase 4 (PDK4) gene Poor nutrition, frequently observed among Southeast Asians usually involves excessive intakes of carbohydrates and monosodium glutamate (MSG), that have been frequently linked to an increased risk of T2DM.
Methods
The 14-week study aimed to assess the effects of high-carbohydrate (HC), high-MSG (HMSG), and a combination of high-carbohydrate and high-MSG (HCHMSG) diets on the development of T2DM using male mice. To assess the effects, the male mice were divided into four groups: control (C), HC, HMSG, and HCHMSG for 14 weeks.
Results
After 14 weeks, both the HC and HCHMSG groups showed signs of T2DM (168.83 ± 32.33; 156.42 ± 32.46). The blood samples from the HMSG, HC, and HCHMSG groups (57.67 ± 2.882; 49.22 ± 7.36; 48.9 ± 6.43) as well as skeletal muscle samples from the HMSG, HC, and HCHMSG groups (57.78 ± 8.54; 42.13 ± 7.25; 37.57 ± 10.42) exhibited a gradual hypomethylation. The HC groups particularly displayed significant PDK4 gene expression in skeletal muscle. A progressive overexpression of the PDK4 gene was observed as well in the HMSG, HCHMSG, and HC groups (2.03 ± 3.097; 3.21 ± 2.94; 5.86 ± 2.54).
Conclusions
These findings suggest that T2DM can be induced by high-carbohydrate and high-MSG diets. However, the sole consumption of high MSG did not lead to the development of T2DM. Further research should focus on conducting long-term studies to fully comprehend the impact of a high MSG diet on individuals with pre-existing T2DM.
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Data availability
Data will be made available upon request.
Abbreviations
- C:
-
Control
- FBG:
-
Fasting blood glucose
- HC:
-
High-carbohydrate
- HCHMSG:
-
High-carbohydrate and high-MSG
- HMSG:
-
High-MSG
- MSG:
-
Monosodium glutamate
- MSP:
-
Methylation specific PCR
- OGTT:
-
Oral glucose tolerance test
- PDC:
-
Pyruvate dehydrogenase complex
- PDK4:
-
Pyruvate dehydrogenase kinase 4
- SPSS:
-
Statistical Package for the Social Sciences
- T2DM:
-
Type 2 diabetes mellitus
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Acknowledgements
The researchers would like to thank the laboratory personnel at the Faculty of Biotechnology, University of Surabaya, for their invaluable support throughout the research.
Funding
The authors wish to acknowledge the financial assistance provided by the Indonesian Ministry of Research, Technology, and Higher Education for this study (058/SP-Lit/LPPM01/KemendikbudRistek/Multi/FTB/V/2022 and 004/SP2H/PT/LL7/2022).
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SEDP, RI, and FMH performed a major part of the research work, performed statistical analysis, interpreted results, and wrote the initial draft. LTM revised the figures, improved the initial draft, and helped in lab work. LTAT also helped in lab work. HW, DK, HWS conceived the idea, supervised the work, revised, modified, and approved the final draft.
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The study underwent a rigorous review from the Research Ethics Committee of the University of Surabaya in Indonesia to ensure that the study was conducted in a manner that respects ethical considerations and the welfare of the subjects involved. The research design received approval from the Committee on September 1, 2020 (No: 138/KE/VIII/2020). The Committee confirmed that the study met the mandatory ethical standards and abided by the Animal Research: Reporting of In Vivo Experiments (ARRIVE) guidelines.
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Putra, S.E.D., Humardani, F.M., Mulyanata, L.T. et al. Exploring diet-induced promoter hypomethylation and PDK4 overexpression: implications for type 2 diabetes mellitus. Mol Biol Rep 50, 8949–8958 (2023). https://doi.org/10.1007/s11033-023-08794-7
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DOI: https://doi.org/10.1007/s11033-023-08794-7