Pulmonary Injury after Combined Exposures to Low-Dose Low-LET Radiation and Fungal Spores
Autor: | Brian Marples, Jacqueline P. Williams, M. D. Sims, Jacob N. Finkelstein, Alvaro Martinez, K. E. Sawarynski, George S. Wilson, L. Downing |
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Rok vydání: | 2011 |
Předmět: |
Pathology
medicine.medical_specialty Biophysics Inflammation Lung injury Radiation Dosage Article Mice medicine Animals Linear Energy Transfer Radiology Nuclear Medicine and imaging Irradiation Aspergillus Radiation biology Aspergillus fumigatus Low dose Environmental Exposure Lung Injury Spores Fungal biology.organism_classification Spore Mice Inbred C57BL Immunohistochemistry Female Pulmonary Injury medicine.symptom Whole-Body Irradiation |
Zdroj: | Radiation Research. 175:501-509 |
ISSN: | 1938-5404 0033-7587 |
Popis: | Exposure to infectious microbes is a likely confounder after a nuclear terrorism event. In combination with radiation, morbidity and mortality from an infection may increase significantly. Pulmonary damage after low-dose low-LET irradiation is characterized by an initial diffuse alveolar inflammation. By contrast, inhaled fungal spores produce localized damage around pulmonary bronchioles. In the present study, we assessed lung injury in C57BL/6 mice after combined exposures to whole-body X radiation and inhaled fungal spores. Either animals were exposed to Aspergillus spores and immediately irradiated with 2 Gy, or the inoculation and irradiation were separated by 8 weeks. Pulmonary injury was assessed at 24 and 48 h and 1, 2, 4, 8, and 24 weeks later using standard H&E-stained sections and compared with sham-treated age-matched controls. Immunohistochemistry for invasive inflammatory cells (macrophages, neutrophils and B and T lymphocytes) was performed. A semi-quantitative assessment of pulmonary injury was made using three distinct parameters: local infiltration of inflammatory cells, diffuse inflammation, and thickening and distortion of alveolar architecture. Radiation-induced changes in lung architecture were most evident during the first 2 weeks postexposure. Fungal changes were seen over the first 4 weeks. Simultaneous combined exposures significantly increased the duration of acute pulmonary damage up to 24 weeks (P < 0.01). In contrast, administration of the fungus 8 weeks after irradiation did not produce enhanced levels of acute pulmonary damage. These data imply that the inhalation of fungal spores at the time of a radiation exposure alters the susceptibility of the lungs to radiation-induced injury. |
Databáze: | OpenAIRE |
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