The paper presents the key milestones and outcomes of 65-year studies of the carcinogenic consequences of accidental radiation exposure of the population of the Ural region.The radioactive contamination of the Techa R...The paper presents the key milestones and outcomes of 65-year studies of the carcinogenic consequences of accidental radiation exposure of the population of the Ural region.The radioactive contamination of the Techa River and the 1957 accident at the Mayak Production Association were the reasons of the long-term population exposure at a wide dose-range.The most important tasks of the study were the reconstruction of individual doses,follow-up of the solid cancer and leukemia incidence and mortality among cohort members.The research results have shown that chronic human exposure,in comparison to acute exposure,does not reduce the risk of developing malignant tumors and leukemias.The value of the dose-rate factor does not exceed"one".Thus,according to our data,the Publication 103 of the International Commission on Radiological Protection seemed to underestimate the radiation risk of malignant tumors and leukemias in case of low dose-rate exposure of the population by a factor of two.Prospects for further radio-epidemiological studies in the Urals are associated with the analysis of the cohort of Southern Urals Populations Exposed to Radiation,which includes about 63 thousand exposed people and makes it possible to assess the radiation risk of solid cancers of certain localizations,certain types of leukemia,and non-cancer effects.展开更多
ObjectiFe To evaluate the changes of pancreatic acinar cell functions in the rats with acutenecrotizing pancreatitis (ANP). methods Seventy SD rats were randomized into two groups: experimental group(n=35) and control...ObjectiFe To evaluate the changes of pancreatic acinar cell functions in the rats with acutenecrotizing pancreatitis (ANP). methods Seventy SD rats were randomized into two groups: experimental group(n=35) and control group (n=35). To prepare the experimental model, the retrograde injection of 5% sodiumtaurocholate into the pancreatic duct was used for inducing ANP. Radioactive tracing by L -3H-phenylalanineand autoradiography were performed for scoring the differences of changes of amino acid uptake, enzyme-proteinsynthesis and output from acinar cells in rats between both groups. Results No changes were observed in aminoacid uptake and enzyme -protein synthesis in rats with dotted and haemorrhagic necrotizing foci as compared withcontrol group. However, accumulated zymogen granules in the interstitial of acinar cells were seen in theexperimental group. Conclusion It indicates that in experimental ANP rats, the functions of acinar cells in bothamino acid uptake and protein synthesis were essentially normal, but the pathway of enzyme output was affectedinto ectopic secretion through the bottom or lateral cellular membrane of pancreatic acinar cell.展开更多
文摘The paper presents the key milestones and outcomes of 65-year studies of the carcinogenic consequences of accidental radiation exposure of the population of the Ural region.The radioactive contamination of the Techa River and the 1957 accident at the Mayak Production Association were the reasons of the long-term population exposure at a wide dose-range.The most important tasks of the study were the reconstruction of individual doses,follow-up of the solid cancer and leukemia incidence and mortality among cohort members.The research results have shown that chronic human exposure,in comparison to acute exposure,does not reduce the risk of developing malignant tumors and leukemias.The value of the dose-rate factor does not exceed"one".Thus,according to our data,the Publication 103 of the International Commission on Radiological Protection seemed to underestimate the radiation risk of malignant tumors and leukemias in case of low dose-rate exposure of the population by a factor of two.Prospects for further radio-epidemiological studies in the Urals are associated with the analysis of the cohort of Southern Urals Populations Exposed to Radiation,which includes about 63 thousand exposed people and makes it possible to assess the radiation risk of solid cancers of certain localizations,certain types of leukemia,and non-cancer effects.
文摘ObjectiFe To evaluate the changes of pancreatic acinar cell functions in the rats with acutenecrotizing pancreatitis (ANP). methods Seventy SD rats were randomized into two groups: experimental group(n=35) and control group (n=35). To prepare the experimental model, the retrograde injection of 5% sodiumtaurocholate into the pancreatic duct was used for inducing ANP. Radioactive tracing by L -3H-phenylalanineand autoradiography were performed for scoring the differences of changes of amino acid uptake, enzyme-proteinsynthesis and output from acinar cells in rats between both groups. Results No changes were observed in aminoacid uptake and enzyme -protein synthesis in rats with dotted and haemorrhagic necrotizing foci as compared withcontrol group. However, accumulated zymogen granules in the interstitial of acinar cells were seen in theexperimental group. Conclusion It indicates that in experimental ANP rats, the functions of acinar cells in bothamino acid uptake and protein synthesis were essentially normal, but the pathway of enzyme output was affectedinto ectopic secretion through the bottom or lateral cellular membrane of pancreatic acinar cell.
