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Intercellular adhesion molecule 1 knockout abrogates radiation induced pulmonary inflammation
1Department of Radiation and Cellular Oncology, University of Chicago and Pritzker School of Medicine, Chicago, IL 60637, USA.
Summary
Ionizing radiation increases intercellular adhesion molecule 1 (ICAM-1) in lung microvessels. Blocking ICAM-1 reduces inflammatory cell infiltration, demonstrating its critical role in radiation-induced lung inflammation.
Area of Science:
- Radiation Biology
- Immunology
- Cell Biology
Background:
- Ionizing radiation exposure elevates intercellular adhesion molecule 1 (ICAM-1; CD54) expression.
- The lung serves as a model to investigate ICAM-1's role in radiation-induced inflammation.
Purpose of the Study:
- To investigate the role of ICAM-1 in the pathogenesis of radiation-induced inflammation in the lung.
- To determine if ICAM-1 is essential for inflammatory cell infiltration into the irradiated lung.
Main Methods:
- Utilized fluorescence-activated cell sorting and UV microscopy to quantify ICAM-1 expression in pulmonary microvascular endothelial cells post-irradiation.
- Administered anti-ICAM-1 blocking antibodies and used ICAM-1 knockout mice to assess inflammatory cell infiltration.
Main Results:
- Radiation exposure induced a dose- and time-dependent increase in ICAM-1 expression in pulmonary microvascular endothelium, with peak expression at 24 hours and a threshold dose of 2 Gy.
- Treatment with anti-ICAM-1 blocking antibodies significantly attenuated inflammatory cell infiltration.
- ICAM-1 knockout mice showed no increase in inflammatory cell infiltration following irradiation.
Conclusions:
- ICAM-1 expression is upregulated in the pulmonary microvascular endothelium in a radiation dose-dependent manner.
- ICAM-1 is a critical mediator required for inflammatory cell infiltration into the lung following ionizing radiation exposure.