1
|
Abstract
Radiation enteritis is an old but emerging question induced by the application of radiation. However, no effective drugs for radiation enteritis in clinic. In this study, we found that thymoquinone (TQ) could mitigate intestinal damages induced by irradiation. After exposure to irradiation, TQ-treated improved the irradiated mice survival rate, ameliorated intestinal injury and increased the numbers of intestinal crypts. Furthermore, Lgr5+ ISCs and their daughter cells, including Vil1+ enterocytes, Ki67+ cells and lysozyme+ Paneth cells, were all significantly increased with TQ treatment. In addition, P53, γH2AX, caspase8, caspase9 and caspase3 expression were all reduced by TQ. Our data showed that TQ modulated DNA damages and decreased the apoptosis in the small intestine. TQ might be used for radiation enteritis treatment.
Collapse
|
2
|
Bellés M, Gonzalo S, Serra N, Esplugas R, Arenas M, Domingo JL, Linares V. Environmental exposure to low-doses of ionizing radiation. Effects on early nephrotoxicity in mice. ENVIRONMENTAL RESEARCH 2017; 156:291-296. [PMID: 28371757 DOI: 10.1016/j.envres.2017.03.034] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2017] [Revised: 03/22/2017] [Accepted: 03/23/2017] [Indexed: 06/07/2023]
Abstract
Nuclear accidents of tremendous magnitude, such as those of Chernobyl (1986) and Fukushima (2011), mean that individuals living in the contaminated areas are potentially exposed to ionizing radiation (IR). However, the dose-response relationship for effects of low doses of radiation is not still established. The present study was aimed at investigating in mice the early effects of low-dose internal radiation exposure on the kidney. Adult male (C57BL/6J) mice were divided into three groups. Two groups received a single subcutaneous (s.c.) doses of cesium (137Cs) with activities of 4000 and 8000Bq/kg bw. A third group (control group) received a single s.c. injection of 0.9% saline. To evaluate acute and subacute effects, mice (one-half of each group) were euthanized at 72h and 10 days post-exposure to 137Cs, respectively. Urine samples were collected for biochemical analysis, including the measurement of F2-isoprostane (F2-IsoP) and kidney injury molecule-1 (KIM-1) levels. Moreover, the concentrations of 8-hydroxy-2'-deoxyguanosine (8-OHdG), a sensitive marker of oxidative DNA damage, were measured in renal tissue. Urinary excretion of total protein significantly increased at 72h in mice exposed to Cs4000. Uric acid and lactate dehydrogenase (LDH) decreased significantly at both times post-exposure in animals exposed to Cs8000. After 72h and 10d of exposure to Cs4000, a significant increase in the γ-glutamil transferase (GGT) and N-acetyl-β-D-glucosaminidase (NAG) activities was observed. In turn, F2-IsoP levels increased -mainly in the Cs4000 group- at 72h post-exposure. Following irradiation (137Cs), the highest level of KIM-1 was corresponded to the Cs4000 group at 72h. Likewise, the main DNA damage was detected in mice exposed to Cs4000, mainly at 10d after irradiation. The alterations observed in several biomarkers suggest an immediate renal damage following exposure to low doses of IR (given as 137Cs). Further investigations are required to clarify the mechanisms involved in the internal IR-induced nephrotoxicity.
Collapse
Affiliation(s)
- Montserrat Bellés
- Physiology Unit, School of Medicine, IISPV, Rovira i Virgili University, Reus, Spain; Laboratory of Toxicology and Environmental Health, School of Medicine, IISPV, Rovira i Virgili University, Reus, Spain
| | - Sergio Gonzalo
- Laboratory of Toxicology and Environmental Health, School of Medicine, IISPV, Rovira i Virgili University, Reus, Spain
| | - Noemí Serra
- Laboratory of Toxicology and Environmental Health, School of Medicine, IISPV, Rovira i Virgili University, Reus, Spain
| | - Roser Esplugas
- Laboratory of Toxicology and Environmental Health, School of Medicine, IISPV, Rovira i Virgili University, Reus, Spain
| | - Meritxell Arenas
- Radiation Oncology Department, Sant Joan University Hospital, IISPV, Rovira i Virgili University, Reus, Spain
| | - José Luis Domingo
- Laboratory of Toxicology and Environmental Health, School of Medicine, IISPV, Rovira i Virgili University, Reus, Spain
| | - Victoria Linares
- Physiology Unit, School of Medicine, IISPV, Rovira i Virgili University, Reus, Spain; Laboratory of Toxicology and Environmental Health, School of Medicine, IISPV, Rovira i Virgili University, Reus, Spain.
| |
Collapse
|
3
|
Le Gallic C, Phalente Y, Manens L, Dublineau I, Benderitter M, Gueguen Y, Lehoux S, Ebrahimian TG. Chronic Internal Exposure to Low Dose 137Cs Induces Positive Impact on the Stability of Atherosclerotic Plaques by Reducing Inflammation in ApoE-/- Mice. PLoS One 2015; 10:e0128539. [PMID: 26046630 PMCID: PMC4457796 DOI: 10.1371/journal.pone.0128539] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2014] [Accepted: 04/28/2015] [Indexed: 01/08/2023] Open
Abstract
After Chernobyl and Fukushima Daï Chi, two major nuclear accidents, large amounts of radionuclides were released in the environment, mostly caesium 137 (137Cs). Populations living in contaminated territories are chronically exposed to radionuclides by ingestion of contaminated food. However, questions still remain regarding the effects of low dose ionizing radiation exposure on the development and progression of cardiovascular diseases. We therefore investigated the effects of a chronic internal exposure to 137Cs on atherosclerosis in predisposed ApoE-/- mice. Mice were exposed daily to 0, 4, 20 or 100 kBq/l 137Cs in drinking water, corresponding to range of concentrations found in contaminated territories, for 6 or 9 months. We evaluated plaque size and phenotype, inflammatory profile, and oxidative stress status in different experimental groups. Results did not show any differences in atherosclerosis progression between mice exposed to 137Cs and unexposed controls. However, 137Cs exposed mice developed more stable plaques with decreased macrophage content, associated with reduced aortic expression of pro-inflammatory factors (CRP, TNFα, MCP-1, IFNγ) and adhesion molecules (ICAM-1, VCAM-1 and E-selectin). Lesions of mice exposed to 137Cs were also characterized by enhanced collagen and smooth muscle cell content, concurrent with reduced matrix metalloproteinase MMP8 and MMP13 expression. These results suggest that low dose chronic exposure of 137Cs in ApoE-/- mice enhances atherosclerotic lesion stability by inhibiting pro-inflammatory cytokine and MMP production, resulting in collagen-rich plaques with greater smooth muscle cell and less macrophage content.
Collapse
Affiliation(s)
- Clélia Le Gallic
- IRSN, Institut de Radioprotection et de Sûreté Nucléaire, Laboratoire de RadioToxicologie Experimentale, 92262, Fontenay-aux-Roses, France
| | - Yohann Phalente
- IRSN, Institut de Radioprotection et de Sûreté Nucléaire, Laboratoire de RadioToxicologie Experimentale, 92262, Fontenay-aux-Roses, France
| | - Line Manens
- IRSN, Institut de Radioprotection et de Sûreté Nucléaire, Laboratoire de RadioToxicologie Experimentale, 92262, Fontenay-aux-Roses, France
| | - Isabelle Dublineau
- IRSN, Institut de Radioprotection et de Sûreté Nucléaire, Laboratoire de RadioToxicologie Experimentale, 92262, Fontenay-aux-Roses, France
| | - Marc Benderitter
- IRSN, Institut de Radioprotection et de Sûreté Nucléaire, Laboratoire de RadioToxicologie Experimentale, 92262, Fontenay-aux-Roses, France
| | - Yann Gueguen
- IRSN, Institut de Radioprotection et de Sûreté Nucléaire, Laboratoire de RadioToxicologie Experimentale, 92262, Fontenay-aux-Roses, France
| | | | - Teni G. Ebrahimian
- IRSN, Institut de Radioprotection et de Sûreté Nucléaire, Laboratoire de RadioToxicologie Experimentale, 92262, Fontenay-aux-Roses, France
| |
Collapse
|
4
|
Abstract
Radiation enteritis continues to be a major health concern in recipients of radiation therapy. The incidence of radiation enteritis is expected to continue to rise during the coming years paralleling the unprecedented use of radiotherapy in pelvic cancers. Radiation enteritis can present as either an acute or chronic syndrome. The acute form presents within hours to days of radiation exposure and typically resolves within few weeks. The chronic form may present as early as 2 months or as long as 30 years after exposure. Risk factors can be divided into patient and treatment-related factors. Chronic radiation enteritis is characterized by progressive obliterative endarteritis with exaggerated submucosal fibrosis and can manifest by stricturing, formation of fistulae, local abscesses, perforation, and bleeding. In the right clinical context, diagnosis can be confirmed by cross-sectional imaging, flexible or video capsule endoscopy. Present treatment strategies are directed primarily towards symptom relief and management of emerging complications. Recently, however, there has been a shift towards rational drug design based on improved understanding of the molecular basis of disease in an effort to limit the fibrotic process and prevent organ damage.
Collapse
Affiliation(s)
- Ali H Harb
- Division of Gastroenterology, Department of Internal Medicine, American University of Beirut Medical Center, Beirut, Lebanon
| | | | | |
Collapse
|
5
|
Abstract
PURPOSE OF REVIEW Injury to the small bowel from ionizing radiation occurs commonly in patients undergoing cancer therapy and less commonly in instances of accidental radiation overexposure. Several lines of evidence now suggest that dynamic interactions between the host's enteric microbiota and innate immune system are important in modulating the intestinal response to radiation. Here, we will review recent developments in the area of acute radiation enteropathy and examine the current state of knowledge regarding the impact of host-microbial interactions in the process. RECENT FINDINGS There is promise in the development and testing of new clinical biomarkers including serum citrulline. Toll-like receptor agonists and innate immune system signaling pathways including nuclear factor-kappa B profoundly alter intestinal epithelial cell apoptosis and crypt survival after radiation exposure. Germ-free conditions, probiotics and antibiotics are each identified as modifiers of disease development and course. A human study suggested that luminal microbiota composition may influence the host's intestinal response to radiation and may change in those developing postradiation diarrhea. SUMMARY New knowledge implies that investigations aimed at deciphering the microbiome-host interactions before and after small bowl radiation injury may eventually allow prediction of disease course and offer opportunities for the development of novel therapeutic or prophylactic strategies.
Collapse
|
6
|
Lestaevel P, Racine R, Bensoussan H, Rouas C, Gueguen Y, Dublineau I, Bertho JM, Gourmelon P, Jourdain JR, Souidi M. Césium 137 : propriétés et effets biologiques après contamination interne. MÉDECINE NUCLÉAIRE 2010. [DOI: 10.1016/j.mednuc.2009.12.003] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
7
|
Ciorba MA, Stenson WF. Probiotic therapy in radiation-induced intestinal injury and repair. Ann N Y Acad Sci 2009; 1165:190-4. [PMID: 19538306 DOI: 10.1111/j.1749-6632.2009.04029.x] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Intestinal injury from ionizing radiation is a clinically important entity, as enteritis symptoms occur commonly after radiotherapy for pelvic malignancies. Preventative or therapeutic options for radiation enteritis are mostly unsatisfactory; however, available data suggests that probiotic bacteria--those which confer health benefit--may have therapeutic value. Previous reports from both human trials and animal models have evaluated various end points for probiotic usage in limiting radiation-associated intestinal damage. Newer data suggests that particular probiotics and/or their secreted or derived bacterial products may have unique radioprotective properties. We will review the area with a focus on new developments surrounding probiotic therapy in radiation-induced intestinal injury and repair.
Collapse
Affiliation(s)
- Matthew A Ciorba
- Division of Gastroenterology, Washington University in Saint Louis School of Medicine, Saint Louis, MO 63110, USA.
| | | |
Collapse
|
8
|
Aschner M, Jiang GCT. Toxicity studies on depleted uranium in primary rat cortical neurons and in Caenorhabditis elegans: what have we learned? JOURNAL OF TOXICOLOGY AND ENVIRONMENTAL HEALTH. PART B, CRITICAL REVIEWS 2009; 12:525-539. [PMID: 20183532 DOI: 10.1080/10937400903358942] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Depleted uranium (DU) is the major by-product of the uranium enrichment process for its more radioactive isotopes, retaining approximately 60% of its natural radioactivity. Given its properties as a pyrophoric and dense metal, it has been extensively used in armor and ammunitions. Questions have been raised regarding the possible neurotoxic effects of DU in humans based on follow-up studies in Gulf War veterans, where a decrease in neurocognitive behavior in a small population was noted. Additional studies in rodents indicated that DU readily traverses the blood-brain barrier, accumulates in specific brain regions, and results in increased oxidative stress, altered electrophysiological profiles, and sensorimotor deficits. This review summarizes the toxic potential of DU with emphasis on studies on thiol metabolite levels, high-energy phosphate levels, and isoprostane levels in primary rat cortical neurons. Studies in Caenorhabditis elegans detail the role of metallothioneins, small thiol-rich proteins, in protecting against DU exposure. In addition, recent studies also demonstrate that only one of the two forms, metallothionein-1, is important in the accumulation of uranium in worms.
Collapse
Affiliation(s)
- Michael Aschner
- Department of Pediatrics, Vanderbilt University Medical Center, Nashville, Tennessee, USA.
| | | |
Collapse
|
9
|
Chronic contamination of rats with 137 cesium radionuclide: impact on the cardiovascular system. Cardiovasc Toxicol 2008; 8:33-40. [PMID: 18327657 DOI: 10.1007/s12012-008-9013-3] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/03/2007] [Accepted: 02/12/2008] [Indexed: 10/22/2022]
Abstract
Cardiovascular system impairment has been observed in children and in liquidators exposed to the Chernobyl nuclear power plant accident. No experimental studies of animals have analyzed whether these disorders might be attributed to chronic ingestion of low levels of cesium 137 ((137)Cs). Biochemical, physiological, and molecular markers of the cardiovascular system were analyzed in rats exposed through drinking water to (137)Cs at a dose of 500 Bq kg(-1) (6500 Bq l(-1)). Plasma concentrations of CK and CK-MB were higher (+52%, P < 0.05) in contaminated rats. No histological alteration of the heart was observed, but gene expression was modified in the atria. Specifically, levels of ACE (angiotensin converting enzyme) and BNP (brain natriuretic peptide) gene expression increased significantly (P < 0.05). ECG analysis did not disclose any arrhythmia except ST- and RT-segment shortening (-9% and -11%, respectively, P < 0.05) in rats exposed to (137)Cs. Mean blood pressure decreased (-10%, P < 0.05), and its circadian rhythm disappeared. Overall, chronic contamination by an extreme environmental dose of (137)Cs for 3 months did not result in cardiac morphological changes, but the cardiovascular system impairments we observed could develop into more significant changes in sensitive animals or after longer contamination.
Collapse
|