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Use of a Hanging-weight System for Liver Ischemia in Mice
Published on: August 7, 2012
CD4(+) T-lymphocytes mediate ischemia/reperfusion-induced inflammatory responses in mouse liver
R M Zwacka1, Y Zhang, J Halldorson
1Institute for Human Gene Therapy at the University of Pennsylvania Medical Center, Department of Molecular and Cellular Engineering, Philadelphia, Pennsylvania 19104, USA.
The Journal of Clinical Investigation
|July 15, 1997
Summary
T-lymphocytes, specifically CD4+ T-cells, are key to initiating subacute inflammatory responses following liver ischemia and reperfusion (I/R) injury. This finding suggests potential therapeutic targets for improving liver transplantation outcomes.
Area of Science:
- Immunology
- Transplantation Biology
- Hepatology
Background:
- Liver transplantation success is limited by factors like MHC compatibility and ischemia/reperfusion (I/R) injury.
- I/R injury has a biphasic pattern: acute (free radical) and subacute (neutrophil-mediated) phases.
- The initiation mechanism of the subacute neutrophil response post-I/R injury remains unclear.
Purpose of the Study:
- To investigate the role of T-lymphocytes in mediating subacute neutrophil inflammatory responses after liver I/R injury.
- To compare liver injury and inflammation in T cell-deficient and immune-competent mice following I/R.
Main Methods:
- Utilized a partial lobar liver ischemia model in T cell-deficient (nu/nu) and immune-competent (BALB/c) mice.
- Assessed liver damage via serum transaminases (GPT) and hepatocellular necrosis.
- Analyzed hepatic neutrophil infiltration and T cell populations (CD4+, CD8+) via adoptive transfer and antibody depletion.
Main Results:
- Acute I/R injury (3-6h) was similar between mouse models.
- Subacute I/R injury (16-20h), including GPT levels and necrosis, was significantly reduced in T cell-deficient mice.
- Reduced injury in nu/nu mice correlated with a 10-fold decrease in hepatic neutrophil infiltration.
- Adoptive transfer of T cells reconstituted the inflammatory response; CD4+ T-cell depletion, but not CD8+, reduced subacute injury and inflammation.
- Hepatic CD4+ T-cell numbers increased within the first hour of reperfusion.
Conclusions:
- CD4+ T-lymphocytes are critical initiators of the inflammatory cascade in subacute liver I/R injury.
- These findings highlight CD4+ T-cells as potential therapeutic targets for mitigating I/R injury in liver transplantation.
