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Evidence of Delayed Gastrointestinal Syndrome in High-dose Irradiated Mice
- Source :
- Health Physics. 103:400-410
- Publication Year :
- 2012
- Publisher :
- Ovid Technologies (Wolters Kluwer Health), 2012.
-
Abstract
- The acute effects of irradiation on the gastrointestinal (GI) system are well documented but the longer-term effects are less well known. Increased incidence of adenocarcinoma has been noted but apart from descriptions of fibrosis, the development of other pathologies specific to survivors of acute radiation is poorly understood. Samples were taken from C57BL/6 mice irradiated with partial-body irradiation where the thorax, head and forelimbs were shielded (i.e. sparing 40% of the bone marrow). Tissue from age matched controls was also collected. There were clear pathological changes in the intestine associated with DEARE (Delayed Effects of Acute Radiation Exposure) at doses greater than 12 Gy, with a dose related increase in observed pathologies. Mice maintained on the synthetic antibiotic ciprofloxacin during the acute phase (days four to twenty), however, had a lower or delayed incidence of symptoms. After twenty days mice developed structures similar to early adenomas. Abnormally high levels of apoptotic and mitotic cells were present in some crypts, along with the early adenomas, suggesting tissue regeneration and areas of deregulated cell turnover. Over time, in animals with advanced symptoms there was inhibited crypt cell proliferation, a blunting of the crypts and villi and an enlargement of villus girth, with an increasingly acellular and fibrotic extracellular matrix (a characteristic that has been previously demonstrated in aging mice). Together these changes may lead to a reduced functional surface area and less motile intestine. These observations are similar to those seen in geriatric animals, suggesting a premature aging of the GI tract.
- Subjects :
- Male
Premature aging
Pathology
medicine.medical_specialty
Time Factors
Gastrointestinal Diseases
Epidemiology
Health, Toxicology and Mutagenesis
Biology
Radiation Dosage
Median lethal dose
Article
Lethal Dose 50
Extracellular matrix
Mice
Fibrosis
medicine
Animals
Humans
Radiology, Nuclear Medicine and imaging
Evidence-Based Medicine
Acute Radiation Syndrome
Dose-Response Relationship, Radiation
medicine.disease
Survival Analysis
Mice, Inbred C57BL
Survival Rate
Radiation Injuries, Experimental
medicine.anatomical_structure
Apoptosis
Adenocarcinoma
Bone marrow
Whole-Body Irradiation
Subjects
Details
- ISSN :
- 00179078
- Volume :
- 103
- Database :
- OpenAIRE
- Journal :
- Health Physics
- Accession number :
- edsair.doi.dedup.....5da12a18d4289f640d73dd6b9231c0de