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Updated: Jun 26, 2025
Murine Model of Intestinal Ischemia-reperfusion Injury
Published on: May 11, 2016
MCU inhibition protects against intestinal ischemia‒reperfusion by inhibiting Drp1-dependent mitochondrial fission
Tulanisa Kadier1, Yi-Guo Zhang1, Yi-Xin Jing1
1Department of Anesthesiology, Renmin Hospital of Wuhan University, Wuhan, 430060, China.
Abstract:
Intestinal ischemia‒reperfusion (IIR) injury is a common complication of surgery, but clear molecular insights and valuable therapeutic targets are lacking. Mitochondrial calcium overload is an early sign of various diseases and is considered a vital factor in ischemia‒reperfusion injury. The mitochondrial calcium uniporter (MCU), which is located on the inner mitochondrial membrane, is the primary mediator of calcium ion entry into the mitochondria. However, the specific mechanism of MCU in IIR injury remains to be clarified. In this study, we generated an IIR model using C57BL/6 mice and Caco-2 cells and found increases in the calcium levels and MCU expression following IIR injury. The specific inhibition of MCU markedly attenuated IIR injury. Moreover, MCU knockdown alleviates mitochondrial dysfunction by reducing oxidative stress and apoptosis. Mechanistically, MCU knockdown substantially reduced the translocation of Drp1 and thus its binding to Fis1 receptors, resulting in decreased mitochondrial fission. Taken together, our findings demonstrated that MCU is a novel upstream regulator of Drp1 in ischemia‒reperfusion and represents a predictive and therapeutic target for IIR.
Insights
Mitochondrial calcium overload contributes to intestinal ischemia-reperfusion (IIR) injury. Inhibiting the mitochondrial calcium uniporter (MCU) reduces injury by decreasing oxidative stress, apoptosis, and mitochondrial fission, identifying MCU as a therapeutic target for IIR.
Area of Science:
- Cell Biology
- Physiology
- Pathology
Background:
- Intestinal ischemia-reperfusion (IIR) injury is a significant surgical complication with limited molecular understanding.
- Mitochondrial calcium overload is an early indicator of cellular damage and a key factor in IIR.
- The mitochondrial calcium uniporter (MCU) regulates calcium entry into mitochondria, but its role in IIR is unclear.
Purpose of the Study:
- To elucidate the specific mechanism of MCU in IIR injury.
- To investigate MCU as a potential therapeutic target for IIR.
Main Methods:
- Generation of IIR models in C57BL/6 mice and Caco-2 cells.
- Assessment of calcium levels and MCU expression.
- Specific inhibition and knockdown of MCU.
- Evaluation of mitochondrial function, oxidative stress, and apoptosis.
- Analysis of Drp1 translocation and mitochondrial fission.
Main Results:
- IIR injury led to increased intracellular calcium levels and elevated MCU expression.
- Specific inhibition of MCU significantly attenuated IIR injury.
- MCU knockdown improved mitochondrial function by reducing oxidative stress and apoptosis.
- MCU inhibition decreased Drp1 translocation and mitochondrial fission.
Conclusions:
- MCU plays a critical role in mediating IIR injury.
- MCU acts as an upstream regulator of Drp1 in the context of IIR.
- Targeting MCU offers a promising therapeutic strategy for mitigating IIR.
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