Abstract
Metformin improves lipid profile, however, combination therapy is developing to increase its effectiveness and reduce the deleterious effects of metformin. Chlorogenic acid (CGA) has exhibited lipid-lowering effects. This study aimed to investigate the combined effect of metformin and CGA on lipid accumulation, as well as to elucidate the engaged mechanism in HepG2 cells. To find the non-lethal doses of metformin and CGA, MTT assay was performed. High Glucose (HG) at 33 mM was used to induce lipogenesis in HepG2 cells. Following treatment with different concentrations of metformin and CGA, total lipid content (Oil Red O-staining), triglyceride level, the genes expression of SREBP-1c and FAS, and phosphorylation of AMPK and ACC were measured. Both Metformin and CGA decreased HG-induced lipid accumulation individually, by decreasing total lipid content and triglyceride level. The lowest effective doses of metformin and CGA were 0.25 mM and 5 μM, respectively, which significantly reduced SREBP-1c and FAS genes expression. The combination of these concentrations reinforced these effects. The phosphorylation of AMPK and ACC were more increased by metformin in combination with CGA than both individually. Our findings suggest that CGA synergistically enhances metformin lipid reducing action via the regulating of involved factors in fatty acid synthesis. Therefore, co-administration of metformin with CGA may have further medical value in treating lipid metabolism disorders.
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Abbreviations
- ACC:
-
acetyl-CoA carboxylase
- cDNA:
-
Complementary DNA
- CGA:
-
Chlorogenic acid
- DMEM:
-
Dulbecco’s Modified Eagle’s Medium
- FBS:
-
fetal bovine serum
- HG:
-
high concentration of D-glucose
- IC50:
-
inhibitory concentration values
- ME:
-
median effective
- NAFLD:
-
non-alcoholic fatty liver disease
- NG:
-
normal glucose
- SREBP-1c:
-
sterol regulatory element-binding protein-1c
- T2DM:
-
Type 2 diabetes mellitus
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Acknowledgements
This work was financially supported by a grant (96-01-30-34043) from the Deputy of Research, Tehran University of Medical Sciences. The results described in this paper were part of the student thesis. We acknowledge the Department of Clinical Biochemistry of Tehran University of Medical Sciences for supporting during the execution of this study.
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Namvarjah, F., Shokri-Afra, H., Moradi-Sardareh, H. et al. Chlorogenic acid improves anti-lipogenic activity of metformin by positive regulating of AMPK signaling in HepG2 cells. Cell Biochem Biophys 80, 537–545 (2022). https://doi.org/10.1007/s12013-022-01077-1
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DOI: https://doi.org/10.1007/s12013-022-01077-1