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Updated: Jul 31, 2026
A Method for Mouse Pancreatic Islet Isolation and Intracellular cAMP Determination
Published on: June 25, 2014
Lycopene ameliorates islet function and down-regulates the TLR4/MyD88/NF-κB pathway in diabetic mice and Min6 cells
Yage Liu1, Yimiao Tian1, Xuan Dai1
1Diabetes Research Center, School of Traditional Chinese Medicine, Beijing University of Chinese Medicine, Beijing 100029, China. dongwei1006@gmail.com.
Abstract:
The inflammation of the pancreatic islets triggers β cell dysfunction and type 2 diabetes mellitus (T2DM) onset. While dietary lycopene consumption contributes to protection against T2DM in animal studies, the potential mechanism of this compound in the regulation of islet function in T2DM remains largely unclear. In this study, by using anti-diabetic metformin as a positive control, we demonstrated that lycopene treatment suppressed islet inflammation and apoptosis in both high-fat diet (HFD)/streptozotocin (STZ)-induced diabetic mice and in Min6 cells exposed to high glucose/palmitic acid (HG/PA)-RAW264.7 conditioned medium. Lycopene intervention resulted in M1/M2 macrophage polarization homeostasis, which is associated with increased insulin secretion, decreased fasting blood glucose levels, and improved lipid profiles in diabetic mice. Furthermore, the protective actions of lycopene were associated with the down-regulation of the TLR4/MyD88/NF-κB signaling pathway, which is positively related to inflammation in both diabetic mice and Min6 cells. Collectively, our findings indicated that lycopene ameliorates islet function and apoptosis and attenuates hyperglycemia and dyslipidemia by the regulation of the TLR4/MyD88/NF-κB signaling pathway. This study highlights dietary lycopene consumption as a novel strategy for the management of patients with diabetes.
Insights
Dietary lycopene combats type 2 diabetes by reducing islet inflammation and apoptosis. This natural compound helps restore insulin secretion and improve blood glucose control by regulating key inflammatory pathways.
Area of Science:
- Endocrinology
- Immunology
- Nutritional Science
Background:
- Pancreatic islet inflammation is a key driver of beta cell dysfunction and type 2 diabetes mellitus (T2DM).
- The precise mechanisms by which dietary compounds like lycopene influence islet function in T2DM are not fully understood.
Purpose of the Study:
- To investigate the protective effects and underlying mechanisms of lycopene on islet inflammation and function in a type 2 diabetes model.
- To explore lycopene's impact on macrophage polarization and the TLR4/MyD88/NF-κB signaling pathway.
Main Methods:
- Utilized high-fat diet/streptozotocin-induced diabetic mice and high glucose/palmitic acid-exposed Min6 cells.
- Assessed lycopene's effects on islet inflammation, apoptosis, insulin secretion, blood glucose, lipid profiles, and macrophage polarization.
- Analyzed the modulation of the TLR4/MyD88/NF-κB signaling pathway.
Main Results:
- Lycopene suppressed islet inflammation and apoptosis in diabetic mice and cell models.
- Lycopene promoted M1/M2 macrophage polarization homeostasis, enhancing insulin secretion and improving glycemic and lipid control.
- Lycopene down-regulated the pro-inflammatory TLR4/MyD88/NF-κB signaling pathway.
Conclusions:
- Lycopene ameliorates islet dysfunction and apoptosis, reducing hyperglycemia and dyslipidemia in T2DM.
- Regulation of the TLR4/MyD88/NF-κB pathway is a key mechanism for lycopene's anti-diabetic effects.
- Dietary lycopene presents a promising therapeutic strategy for managing type 2 diabetes.
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