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Spatiotemporal analysis of ROS in hepatic ischemia-reperfusion and prediction of organ damage using MRI
Atsushi Yamashita1,2, Hitoshi Togashi3, Kazuyuki Haga4
1Division of Cardiovascular Surgery, Second Department of Surgery, Faculty of Medicine, Yamagata University, Japan.
Abstract:
Our study focused on the spatiotemporal analysis of reactive oxygen species (ROS), a key factor in hepatic ischemia-reperfusion injury, using a rat model to evaluate potential clinical applications. By inducing partial hepatic ischemia-reperfusion in rats through ligation of left portal vein and hepatic artery (one hour ischemia followed by reperfusion), we explored ROS generation using an imaging probe, 1-acetoxy-3-carbamoyl-2,2,5,5-tetramethylpyrroline (ACP), which reacts with ROS to produce a detectable T1-enhanced magnet resonance imaging (MRI) signal. In the rat model, the region of the left liver ischemia-reperfusion showed extremely mild liver injury one hour after reperfusion. After 12 h of reperfusion, extensive hepatocellular necrosis was observed, mainly in the hepatic interlobular region. One hour after reperfusion, the ACP-derived MRI signal increased in the region of left lobe ischemia-reperfusion was significantly higher than that in the non-ischemia-reperfusion region of the same rat right lobe. Administration of edaravone targeting the period of excessive ROS production at 1 h after reperfusion significantly suppressed hepatic injury 12 h after ischemia-reperfusion. Given MRI's crucial role in clinical diagnostics and its adaptability, our research suggests a promising strategy for early intervention in organ damage by monitoring and modulating ROS levels, potentially revolutionizing patient care.
Insights
This study monitored reactive oxygen species (ROS) in a rat model of liver injury using advanced MRI. Early detection and intervention with edaravone significantly reduced liver damage, showing potential for clinical application.
Area of Science:
- Biomedical Imaging
- Hepatology
- Oxidative Stress Research
Background:
- Hepatic ischemia-reperfusion injury is a significant clinical challenge.
- Reactive oxygen species (ROS) play a critical role in the pathogenesis of this injury.
- Current methods for monitoring ROS in vivo are limited.
Purpose of the Study:
- To investigate the spatiotemporal dynamics of ROS during hepatic ischemia-reperfusion injury.
- To evaluate the potential of a novel MRI-based imaging probe for ROS detection.
- To assess the therapeutic efficacy of early intervention targeting ROS.
Main Methods:
- A rat model of partial hepatic ischemia-reperfusion was established.
- 1-acetoxy-3-carbamoyl-2,2,5,5-tetramethylpyrroline (ACP), an imaging probe, was used with MRI to detect ROS.
- Edaravone was administered to target excessive ROS production post-reperfusion.
Main Results:
- Significant ROS generation was detected in the ischemic liver region using ACP-enhanced MRI.
- Early hepatocellular necrosis was observed 12 hours after reperfusion.
- Edaravone administration at 1 hour post-reperfusion significantly attenuated liver injury.
Conclusions:
- ACP-enhanced MRI is a viable tool for spatiotemporal ROS monitoring in hepatic ischemia-reperfusion.
- Targeting ROS production early after reperfusion can mitigate liver injury.
- This approach holds promise for early clinical intervention in organ damage.
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