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Published on: April 19, 2024
Activation of mitogen-activated protein kinases during human lung transplantation
Shoji Sakiyama1, Julia Hamilton, Bing Han
1Thoracic Surgery Research Laboratory, University Health Network Toronto General Hospital and Department of Surgery and Institute of Medical Science, Faculty of Medicine, University of Toronto, Toronto, Ontario, Canada.
Background:
Ischemia-reperfusion is one of the unavoidable steps in lung transplantation; it is associated with acute inflammatory responses and cell death. The intracellular signal transduction mechanisms of these events are largely unknown. We hypothesize that activation of mitogen-activated protein kinases (MAPKs) is one of the important signaling events during human lung transplantation.
Methods:
Lung tissue biopsies were performed on 15 patients undergoing transplantation: after cold ischemic preservation; after warm ischemia (implantation); and after 1- or 2-hour reperfusion. The phosphorylation status of MAPK isoforms (ERK, p38-MAPK and JNK) was examined by Western blotting.
Results:
Phosphorylation of ERK was dramatically increased during the first 2 hours of reperfusion. Phosphorylation of JNK also significantly increased at lower levels. In contrast, phosphorylation of p38 showed no significant changes.
Conclusions:
We speculate that the rapid and sustained activation of ERK and JNK during the early reperfusion period may contribute to acute inflammatory responses and cell death of lung grafts.
Insights
Lung transplantation involves ischemia-reperfusion injury. This study found that early reperfusion activates specific mitogen-activated protein kinases (MAPKs), namely ERK and JNK, potentially contributing to lung graft inflammation and cell death.
Area of Science:
- Transplantation immunology
- Molecular biology
- Cell signaling
Background:
- Ischemia-reperfusion is a critical event in lung transplantation, leading to inflammation and cell death.
- The precise intracellular signaling pathways involved remain largely unknown.
- Mitogen-activated protein kinases (MAPKs) are hypothesized to play a role in these responses.
Purpose of the Study:
- To investigate the role of MAPK signaling pathways in human lung transplantation.
- To examine the activation status of ERK, p38-MAPK, and JNK during lung reperfusion.
Main Methods:
- Lung tissue biopsies were collected from 15 transplant patients at various stages: cold preservation, warm ischemia, and 1-2 hours post-reperfusion.
- Western blotting was employed to assess the phosphorylation status of ERK, p38-MAPK, and JNK.
Main Results:
- ERK phosphorylation significantly increased within the first 2 hours of reperfusion.
- JNK phosphorylation also showed a significant, albeit lower, increase.
- No significant changes were observed in p38-MAPK phosphorylation.
Conclusions:
- Early reperfusion in lung transplantation leads to rapid activation of ERK and JNK.
- These activated MAPKs may contribute to acute inflammatory responses and cell death in lung grafts.
- Further research into MAPK inhibition could offer therapeutic strategies for lung transplantation.
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