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4-OI Protects MIN6 Cells from Oxidative Stress Injury by Reducing LDHA-Mediated ROS Generation
Jianmin Wu1,2, Xingshi Gu1,2, Juan Zhang1,2
1Institute for Cell Transplantation and Gene Therapy, The 3rd Xiangya Hospital of Central South University, Changsha 410000, China.
Abstract:
Pancreatic beta cells are highly susceptible to oxidative stress, which plays a crucial role in diabetes outcomes. Progress has been slow to identify molecules that could be utilized to enhance cell survival and function under oxidative stress. Itaconate, a byproduct of the tricarboxylic acid cycle, has both anti-inflammatory and antioxidant properties. The effects of itaconate on beta cells under oxidative stress are relatively unknown. We explored the effects of 4-octyl itaconate-a cell-permeable derivative of itaconate-on MIN6 (a beta cell model) under oxidative stress conditions caused by hypoxia, along with its mechanism of action. Treatment with 4-OI reversed hypoxia-induced cell death, reduced ROS production, and inhibited cell death pathway activation and inflammatory cytokine secretion in MIN6 cells. The 4-OI treatment also suppressed lactate dehydrogenase A (LDHA)activity, which increases under hypoxia. Treatment of cells with the ROS scavenger NAC and LDHA-specific inhibitor FX-11 reproduced the beneficial effects of 4-OI on MIN6 cell viability under oxidative stress conditions, confirming its role in regulating ROS production. Conversely, overexpression of LDHA reduced the beneficial effects exerted by 4-OI on cells. Our findings provide a strong rationale for using 4-OI to prevent the death of MIN6 cells under oxidative stress.
Insights
4-octyl itaconate protects pancreatic beta cells from oxidative stress by reducing reactive oxygen species (ROS) and inhibiting cell death pathways. This finding offers a potential therapeutic strategy for diabetes management.
Area of Science:
- Cell Biology
- Metabolism
- Endocrinology
Background:
- Pancreatic beta cells are vulnerable to oxidative stress, impacting diabetes outcomes.
- Identifying molecules to protect beta cells from oxidative damage is crucial but challenging.
Purpose of the Study:
- To investigate the protective effects of 4-octyl itaconate (4-OI) on MIN6 beta cells under oxidative stress induced by hypoxia.
- To elucidate the mechanism of action of 4-OI in beta cell protection.
Main Methods:
- MIN6 cells were subjected to hypoxia to induce oxidative stress.
- Cells were treated with 4-octyl itaconate (4-OI).
- Assays were performed to measure cell viability, ROS production, inflammatory cytokine secretion, and lactate dehydrogenase A (LDHA) activity. Genetic manipulation (LDHA overexpression) and pharmacological inhibitors (NAC, FX-11) were used to confirm mechanisms.
Main Results:
- 4-OI treatment reversed hypoxia-induced cell death in MIN6 cells.
- 4-OI reduced reactive oxygen species (ROS) production and inhibited inflammatory cytokine secretion.
- 4-OI suppressed lactate dehydrogenase A (LDHA) activity, and its protective effects were linked to ROS regulation.
Conclusions:
- 4-octyl itaconate demonstrates significant protective effects against oxidative stress in pancreatic beta cells.
- The mechanism involves reducing ROS production and modulating LDHA activity.
- 4-OI presents a promising therapeutic candidate for preventing beta cell death in conditions like diabetes.
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