This study investigated the impact of simulated microgravity on acute injury induced by low doses of carbon ions in male reproductive organs of mice,and determined alterations in spermatogenic function and expression ...This study investigated the impact of simulated microgravity on acute injury induced by low doses of carbon ions in male reproductive organs of mice,and determined alterations in spermatogenic function and expression levels of apoptotic factors in mice following exposure to acute irradiation after 7 days of simulated microgravity.The results demonstrated that significant reductions in spermatozoa,primary spermatocytes and spermatogonia,and increased globular cells in seminiferous tubule and pro-apoptotic proteins were observed in the group exposed to over0.4 Gy irradiation.Collectively,the data suggest that lesions inflicted by simulated microgravity are not markedly modified by lower doses of irradiation(0.2 Gy)in mouse testis compared to the control group.However,testicular impairments were markedly evident in the group exposed to higher doses of carbon ions plus simulated microgravity,which may be due at least in part to elevated apoptosis initiated by the mitochondrial apoptosis pathway in germ cells.展开更多
目的:观察藏医佐木阿汤及放血疗法对高原红细胞增多症(H A P C)模型大鼠血常规中红细胞(RBC)、血红蛋白(Hb)和红细胞压积(HCT)及血清促红细胞生成素(EPO)的影响。方法:选用雄性Wistar大鼠56只,随机分为平原对照组、高原模型组、药物组...目的:观察藏医佐木阿汤及放血疗法对高原红细胞增多症(H A P C)模型大鼠血常规中红细胞(RBC)、血红蛋白(Hb)和红细胞压积(HCT)及血清促红细胞生成素(EPO)的影响。方法:选用雄性Wistar大鼠56只,随机分为平原对照组、高原模型组、药物组、放血组、药物加放血组。除平原对照组外,余组均饲养于拉萨以建立HAPC模型。饲养3个月后分别进行佐木阿汤灌胃和放血干预,干预3个月后取血进行血常规及EPO检测。结果:高原模型组大鼠RBC、Hb、HCT、EPO含量均较平原对照组升高(P<0.05);与高原模型组比较,药物组、放血组、药物加放血组干预后以上生化指标均降低,且药物组和药物加放血组效果更好(P<0.05),放血组仅对于RBC、EPO含量的影响具有统计学意义(P<0.05)。干预三组间比较均没有统计学意义。结论:藏医佐木阿汤与放血疗法对于HAPC的防治有效果。展开更多
Radon represents the major source of natural radioactivity in confined environments. Despite the clear evidence of a direct association between residential exposure and human lung cancer provided by case-control studi...Radon represents the major source of natural radioactivity in confined environments. Despite the clear evidence of a direct association between residential exposure and human lung cancer provided by case-control studies, results relating indoor exposure and genotoxic/mutagenic effect induction are still contradictory. The present study attempts to estimate the genotoxic effects induced by exposure to radioactive radon in wild cricket populations sampled from caves where varying concentrations of radon are present. Cave crickets are also tested as possible bio-indicator organisms of genotoxic potential of contaminated residential and confined environments. Six caves in Central Italy are considered covering a broad spectrum of radon radioactivity concentration （221-26,000 Bq/m3）. Dolichopoda specimens were sampled from each cave; both haemocytes and brain cells taken from individuals were tested for responsiveness to DNA damage induced by radon through the Comet assay. Specimens from the least radioactive cave, housed in controlled conditions for 60 days before analysis, were used as control group. Statistically significant increase of DNA damage was found in all groups of individuals from each cave, for both cell types. Very low values of all Comet parameters were found in control group individuals, which gave indications of a good responsiveness of the organism to the variable environmental levels of radioactive contamination. Results indicate that cave crickets represent a reliable tool for the detection of genotoxic potential induced by radioactive contamination of confined environments and can be proposed as a possible bio-indicator system for air （-radioactive） pollution related to indoor exposure [Current Zoology 60 （2）： 299-307, 2014].展开更多
眼晶状体是人体对辐射最敏感的组织之一,电离辐射的生物效应因其传能线密度(linear energy transfer,LET)的不同而不同,同等吸收剂量条件下,高LET辐射生物效应比低LET辐射更强,尽管目前辐射对眼晶状体的影响这一领域已经有了较多研究,...眼晶状体是人体对辐射最敏感的组织之一,电离辐射的生物效应因其传能线密度(linear energy transfer,LET)的不同而不同,同等吸收剂量条件下,高LET辐射生物效应比低LET辐射更强,尽管目前辐射对眼晶状体的影响这一领域已经有了较多研究,但对于高LET对眼晶状体的影响知之甚少。本文简述人眼晶状体剂量限值的历史变化情况,综述各种高LET粒子的生物学实验,调查高LET辐射眼晶状体的流行病学,简要分析高原白内障高患病率的原因,并初步讨论未来研究高LET需要考虑的因素,旨在为国内今后开展高LET辐射对人眼晶状体的研究提供有价值的信息。展开更多
基金Supported by grants from the National Basic Research Program of China(No.2010CB834202)Knowledge Innovation Projection of Chinese Academy of Science(No.KJCX2-YW-L08)The National Natural Science Foundation of China(No.10835011,No.10675151,No.41161058,No.31060065 and No.10805064)
文摘This study investigated the impact of simulated microgravity on acute injury induced by low doses of carbon ions in male reproductive organs of mice,and determined alterations in spermatogenic function and expression levels of apoptotic factors in mice following exposure to acute irradiation after 7 days of simulated microgravity.The results demonstrated that significant reductions in spermatozoa,primary spermatocytes and spermatogonia,and increased globular cells in seminiferous tubule and pro-apoptotic proteins were observed in the group exposed to over0.4 Gy irradiation.Collectively,the data suggest that lesions inflicted by simulated microgravity are not markedly modified by lower doses of irradiation(0.2 Gy)in mouse testis compared to the control group.However,testicular impairments were markedly evident in the group exposed to higher doses of carbon ions plus simulated microgravity,which may be due at least in part to elevated apoptosis initiated by the mitochondrial apoptosis pathway in germ cells.
文摘目的:观察藏医佐木阿汤及放血疗法对高原红细胞增多症(H A P C)模型大鼠血常规中红细胞(RBC)、血红蛋白(Hb)和红细胞压积(HCT)及血清促红细胞生成素(EPO)的影响。方法:选用雄性Wistar大鼠56只,随机分为平原对照组、高原模型组、药物组、放血组、药物加放血组。除平原对照组外,余组均饲养于拉萨以建立HAPC模型。饲养3个月后分别进行佐木阿汤灌胃和放血干预,干预3个月后取血进行血常规及EPO检测。结果:高原模型组大鼠RBC、Hb、HCT、EPO含量均较平原对照组升高(P<0.05);与高原模型组比较,药物组、放血组、药物加放血组干预后以上生化指标均降低,且药物组和药物加放血组效果更好(P<0.05),放血组仅对于RBC、EPO含量的影响具有统计学意义(P<0.05)。干预三组间比较均没有统计学意义。结论:藏医佐木阿汤与放血疗法对于HAPC的防治有效果。
文摘Radon represents the major source of natural radioactivity in confined environments. Despite the clear evidence of a direct association between residential exposure and human lung cancer provided by case-control studies, results relating indoor exposure and genotoxic/mutagenic effect induction are still contradictory. The present study attempts to estimate the genotoxic effects induced by exposure to radioactive radon in wild cricket populations sampled from caves where varying concentrations of radon are present. Cave crickets are also tested as possible bio-indicator organisms of genotoxic potential of contaminated residential and confined environments. Six caves in Central Italy are considered covering a broad spectrum of radon radioactivity concentration （221-26,000 Bq/m3）. Dolichopoda specimens were sampled from each cave; both haemocytes and brain cells taken from individuals were tested for responsiveness to DNA damage induced by radon through the Comet assay. Specimens from the least radioactive cave, housed in controlled conditions for 60 days before analysis, were used as control group. Statistically significant increase of DNA damage was found in all groups of individuals from each cave, for both cell types. Very low values of all Comet parameters were found in control group individuals, which gave indications of a good responsiveness of the organism to the variable environmental levels of radioactive contamination. Results indicate that cave crickets represent a reliable tool for the detection of genotoxic potential induced by radioactive contamination of confined environments and can be proposed as a possible bio-indicator system for air （-radioactive） pollution related to indoor exposure [Current Zoology 60 （2）： 299-307, 2014].
文摘眼晶状体是人体对辐射最敏感的组织之一,电离辐射的生物效应因其传能线密度(linear energy transfer,LET)的不同而不同,同等吸收剂量条件下,高LET辐射生物效应比低LET辐射更强,尽管目前辐射对眼晶状体的影响这一领域已经有了较多研究,但对于高LET对眼晶状体的影响知之甚少。本文简述人眼晶状体剂量限值的历史变化情况,综述各种高LET粒子的生物学实验,调查高LET辐射眼晶状体的流行病学,简要分析高原白内障高患病率的原因,并初步讨论未来研究高LET需要考虑的因素,旨在为国内今后开展高LET辐射对人眼晶状体的研究提供有价值的信息。
