Related Experiment Videos
Kupffer cell function in ischemic and nonischemic livers after hepatic partial ischemia/reperfusion
A Nakamitsu1, E Hiyama, Y Imamura
1First Department of Surgery, Hiroshima University, Faculty of Medicine, School of Medicine, Japan.
Surgery Today
|April 9, 2001
Summary
Hepatic partial ischemia/reperfusion (I/R) injury activates Kupffer cells (KCs) in both ischemic and nonischemic liver areas. This KC activation, involving superoxide generation and cytokine release, contributes to liver dysfunction after surgery.
Area of Science:
- Hepatology
- Immunology
- Surgical Research
Background:
- Hepatic partial ischemia/reperfusion (I/R) injury is a common complication of hepatobiliary surgery.
- Kupffer cells (KCs) are key immune cells implicated in the pathogenesis of hepatic I/R injury.
- Understanding KC activation in both ischemic and nonischemic liver regions is crucial for managing I/R injury.
Purpose of the Study:
- To investigate Kupffer cell (KC) activation in ischemic and nonischemic liver tissues following partial hepatic I/R injury.
- To analyze superoxide generation and proinflammatory cytokine production by KCs in different liver lobes post-reperfusion.
- To elucidate the temporal dynamics of KC activation and its role in hepatic I/R injury.
Main Methods:
- Utilized a rat model of partial hepatic I/R injury.
- Measured superoxide generation by Kupffer cells (KCs) in ischemic and nonischemic liver lobes at various time points after reperfusion.
- Quantified the production of proinflammatory cytokines, including interleukin-1beta (IL-1beta) and tumor necrosis factor-alpha (TNF-alpha), and their corresponding mRNA levels.
Main Results:
- KC superoxide generation was upregulated in both ischemic and nonischemic lobes post-reperfusion.
- Interleukin-1beta (IL-1beta) production by KCs increased in ischemic lobes early and late post-reperfusion, with a late increase also noted in nonischemic lobes.
- Tumor necrosis factor-alpha (TNF-alpha) production increased in both lobes, with IL-1beta mRNA upregulation preceding TNF-alpha mRNA upregulation in ischemic lobes.
Conclusions:
- Partial hepatic I/R injury leads to Kupffer cell (KC) activation in both ischemic and nonischemic liver areas.
- KC activation occurs sequentially, initiating in ischemic areas and subsequently affecting nonischemic regions.
- This widespread KC activation is a significant factor contributing to liver dysfunction following partial hepatic I/R during surgery.