No Significant Endothelial Apoptosis in the Radiation-Induced Gastrointestinal Syndrome
- Department of Nuclear Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA (United States)
- Division of Comparative Medicine, Massachusetts Institute of Technology, Cambridge, MA (United States)
- Nuclear Reactor Laboratory, Massachusetts Institute of Technology, Cambridge, MA (United States)
- Department of Chemistry and Biochemistry, University of California, Los Angeles, CA (United States)
Purpose: This report addresses the incidence of vascular endothelial cell apoptosis in the mouse small intestine in relation to the radiation-induced gastrointestinal (GI) syndrome. Methods and Materials: Nonanesthetized mice received whole-body irradiation at doses above and below the threshold for death from the GI syndrome with 250 kVp X-rays, {sup 137}Cs gamma rays, epithermal neutrons alone, or a unique approach for selective vascular irradiation using epithermal neutrons in combination with boronated liposomes that are restricted to the blood. Both terminal deoxynucleotidyl transferase biotin-dUTP nick end labeling (TUNEL) staining for apoptosis and dual-fluorescence staining for apoptosis and endothelial cells were carried out in jejunal cross-sections at 4 h postirradiation. Results: Most apoptotic cells were in the crypt epithelium. The number of TUNEL-positive nuclei per villus was low (1.62 {+-} 0.03, mean {+-} SEM) for all irradiation modalities and showed no dose-response as a function of blood vessel dose, even as the dose crossed the threshold for death from the GI syndrome. Dual-fluorescence staining for apoptosis and endothelial cells verified the TUNEL results and identified the apoptotic nuclei in the villi as CD45-positive leukocytes. Conclusion: These data do not support the hypothesis that vascular endothelial cell apoptosis is the cause of the GI syndrome.
- OSTI ID:
- 20951634
- Journal Information:
- International Journal of Radiation Oncology, Biology and Physics, Vol. 68, Issue 1; Other Information: DOI: 10.1016/j.ijrobp.2006.12.069; PII: S0360-3016(07)00117-4; Copyright (c) 2007 Elsevier Science B.V., Amsterdam, Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0360-3016
- Country of Publication:
- United States
- Language:
- English
Similar Records
HIV antiretroviral drug combination induces endothelial mitochondrial dysfunction and reactive oxygen species production, but not apoptosis
p53-Based Strategy for Protection of Bone Marrow From Y-90 Ibritumomab Tiuxetan
Related Subjects
APOPTOSIS
BIOTIN
BLOOD VESSELS
CESIUM 137
DEATH
ENDOTHELIUM
EPITHELIUM
EPITHERMAL NEUTRONS
FLUORESCENCE
GAMMA RADIATION
LEUKOCYTES
LIPOSOMES
MICE
RADIATION DOSES
SCANNING ELECTRON MICROSCOPY
SMALL INTESTINE
WHOLE-BODY IRRADIATION
X RADIATION