Abstract
Objective
Insulin resistance develops due to skeletal muscle inflammation and endoplasmic reticulum (ER) stress. Stachydrine (STA), extracted from Leonurus heterophyllus, has been shown to suppress proliferation and induce apoptosis in breast cancer cells and exert anti-inflammatory properties in the brain, heart, and liver. However, the roles of STA in insulin signaling in skeletal muscle remain unclear. Herein, we examined the impacts of STA on insulin signaling in skeletal muscle under hyperlipidemic conditions and its related molecular mechanisms.
Methods
Various protein expression levels were determined by Western blotting. Levels of mouse serum cytokines were measured by ELISA.
Results
We found that STA-ameliorated inflammation and ER stress, leading to attenuation of insulin resistance in palmitate-treated C2C12 myocytes. STA dose-dependently enhanced AMPK phosphorylation and HO-1 expression. Administration of STA attenuated not only insulin resistance but also inflammation and ER stress in the skeletal muscle of high-fat diet (HFD)-fed mice. Additionally, STA-ameliorated glucose tolerance and insulin sensitivity, as well as serum TNFα and MCP-1, in mice fed a HFD. Small interfering (si) RNA-associated suppression of AMPK or HO-1 expression abolished the effects of STA in C2C12 myocytes.
Conclusions
These results suggest that STA activates AMPK/HO-1 signaling, resulting in reduced inflammation and ER stress, thereby improving skeletal muscle insulin resistance. Using STA as a natural ingredient, this research successfully treated insulin resistance and type 2 diabetes.
Graphical Abstract
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Abbreviations
- AMPK:
-
AMP-activated protein kinase
- HO-1:
-
Heme oxygenase-1
- ER stress:
-
Endoplasmic reticulum stress
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Funding
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIT) (No. NRF-2021R1F1A1050004 and No. 2022R1A2B5B01001453).
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Animal experiments were approved by the Institutional Animal Care and Use Committee of Chung-Ang University, Seoul, Republic of Korea (Approval No.: 2020-00048) and carried out according to the Guide for the Care and Use of Laboratory Animals (NIH publication, 8th edition, 2011).
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40618_2022_1866_MOESM1_ESM.tif
Supplementary file1. Figure S1. STA does not affect palmitate-induced TG accumulation and does not modulate insulin-stimulated ERK1/2 signaling. A Western blotting of phosphorylated ERK1/2 expression in C2C12 myocytes treated with palmitate (200 μM) and/or STA (20 μM) for 24 h. Human insulin (5 nM) was used to upregulate insulin signaling for 3 min. B Oil red O-based TG measurement in C2C12 myocytes in the presence of palmitate (200 μM) and/or STA (0-20 μM) for 24 h. Means ± SEM were calculated from three independent experiments. Significance (P < 0.05) *: vs insulin-treated control or control. (TIF 117 KB)
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Jung, T.W., Kim, H., Park, S.Y. et al. Stachydrine alleviates lipid-induced skeletal muscle insulin resistance via AMPK/HO-1-mediated suppression of inflammation and endoplasmic reticulum stress. J Endocrinol Invest 45, 2181–2191 (2022). https://doi.org/10.1007/s40618-022-01866-8
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DOI: https://doi.org/10.1007/s40618-022-01866-8