Effects of chronic 137Cs ingestion on barrier properties of jejunal epithelium in rats
| Autor: | Stéphane Grison, Jocelyne Aigueperse, Philippe Voisin, Line Grandcolas, Patrick Gourmelon, C. Baudelin, François Paquet, Isabelle Dublineau |
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| Přispěvatelé: | Laboratoire de radiotoxicologie et radiobiologie expérimentale (LRTOX), Institut de Radioprotection et de Sûreté Nucléaire (IRSN) |
| Jazyk: | angličtina |
| Rok vydání: | 2007 |
| Předmět: |
Male
Cellular immunity Pathology Health Toxicology and Mutagenesis [SDV]Life Sciences [q-bio] environmental exposure Administration Oral Gene Expression Toxicology 030218 nuclear medicine & medical imaging Rats Sprague-Dawley Jejunum 0302 clinical medicine Intestinal mucosa electric conductivity dose response cytokine Ingestion rat Intestinal Mucosa enteritis intestine villus cell count 0303 health sciences Th1 cell apoptosis article intestine function Environmental exposure 3. Good health carbachol medicine.anatomical_structure priority journal Cesium Radioisotopes Administration cytokine production medicine.symptom cholinergic activity Oral medicine.medical_specialty FAS ligand animal experiment Inflammation cellular immunity Biology intestine crypt animal tissue long term exposure 03 medical and health sciences toxicity testing Internal medicine electric potential medicine In Situ Nick-End Labeling Animals Animalia controlled study neutrophil chemotaxis protein expression 030304 developmental biology Cell Proliferation intestine epithelium nonhuman cesium 137 Rattus animal model chemokine drinking water Fas antigen Epithelium Small intestine Rats Endocrinology Th2 cell 13. Climate action Sprague-Dawley cell structure |
| Zdroj: | Journal of Toxicology and Environmental Health-Part A: Current Issues Journal of Toxicology and Environmental Health-Part A: Current Issues, 2007, 70 (10), pp.810-819. ⟨10.1080/15287390701209113⟩ |
| Popis: | Environmental contamination by 137Cs is of particular public health interest because of the various sources of fallout originating from nuclear weapons, radiological source disruptions, and the Chernobyl disaster. This dispersion may lead to a chronic ecosystem contamination and subsequent ingestion of contaminated foodstuffs. The aim of this study was to thus determine the impact of a chronic ingestion of low-dose 137Cs on small intestine functions in rats. The animals received 150 Bq per day in drinking water over 3 mo. At these environmental doses, 137Cs contamination did not modify the crypt and villus architecture. In addition, epithelial integrity was maintained following the chronic ingestion of 137Cs, as demonstrated by histological analyses (no breakdown of the surface mucosa) and electrical transepithelial parameters (no change in potential difference and tissue conductance). Furthermore, cesium contamination seemed to induce contradictory effects on the apoptosis pathway, with an increase in the gene expression of Fas/FasL and a decrease in the apoptotic cell number present in intestinal mucosa. No marked inflammation was observed following chronic ingestion of 137Cs, as indicated by neutrophil infiltration and gene expression of cytokines and chemokines. Results indicated no imbalance in the Th1/Th2 response induced by cesium at low doses. Finally, evaluation of the functionality of the jejunal epithelium in rats contaminated chronically with 137Cs did not demonstrate changes in the maximal response to carbachol, nor in the cholinergic sensitivity of rat jejunal epithelium. In conclusion, this study shows that chronic ingestion of 137Cs over 3 mo at postaccidental doses exerts few biological effects on the epithelium of rat jejunum with regard to morphology, inflammation status, apoptosis/proliferation processes, and secretory functions. Copyright © Taylor & Francis Group, LLC. |
| Databáze: | OpenAIRE |
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