探讨电离辐射引起小鼠认知功能障碍的可能机制。24只雌性昆明小鼠随机分为对照组和辐照组,辐照组小鼠接受137Csγ射线单次全身辐照至吸收剂量4 Gy。35 d后采用Y迷宫实验检测小鼠认知功能;免疫组织化学法检测小鼠海马区星形胶质细胞(Astr...探讨电离辐射引起小鼠认知功能障碍的可能机制。24只雌性昆明小鼠随机分为对照组和辐照组,辐照组小鼠接受137Csγ射线单次全身辐照至吸收剂量4 Gy。35 d后采用Y迷宫实验检测小鼠认知功能;免疫组织化学法检测小鼠海马区星形胶质细胞(Astrocytes,Ast)标记物胶质纤维酸性蛋白(Glial fibrillary acidic protein,GFAP)阳性细胞数的表达变化;Western blot方法检测海马GFAP蛋白的表达变化;荧光定量PCR检测炎性因子白细胞介素IL-1α、IL-1β、IL-6 mRNA和海马GFAP的表达情况。结果表明:与对照组相比,辐照组小鼠在Y迷宫实验中自发交替率明显降低(78.40±4.16 vs. 67.53±3.08,p<0.05);海马区GFAP阳性细胞数明显增加(133.4±9.6 vs. 280.3±32.7,p<0.01);GFAP蛋白及mRNA表达均显著上调(1.000±0.036vs. 1.300±0.102,p<0.05;1.000±0.031 vs. 1.203±0.078,p<0.05);IL-1α、IL-1β和IL-6 mRNA的表达均明显上调(1.000±0.133 vs. 1.677±0.164,p<0.01;1.000±0.132 vs. 1.488±0.105,p<0.05;1.000±0.218 vs.2.181±0.188,p<0.01)。研究提示,电离辐射可能是通过激活海马Ast诱导炎症因子释放,从而引起认知功能障碍。展开更多
The molecular response of wheat（Triticum aestivum L.,cv.Yangmai 13） seedlings to heavy metal（Cd,Hg） and 1,2,4-trichlorobenzene（TCB） stresses were examined by two-dimensional gel electrophoresis,image analysis,an...The molecular response of wheat（Triticum aestivum L.,cv.Yangmai 13） seedlings to heavy metal（Cd,Hg） and 1,2,4-trichlorobenzene（TCB） stresses were examined by two-dimensional gel electrophoresis,image analysis,and peptide mass fingerprinting.The results showed inhibitions of root and shoot growth by Cd,Hg,and TCB.These stresses led to water deficit and lipid phosphorylation in the seedling which also promoted protein phophorylation in the leaves.Hg stress inhibited protein synthesis while Cd and TCB stresses induced or up-regulated more proteins in the leaves.Most of these induced proteins played important roles in the biochemical reactions involved in tolerance of wheat to Cd and TCB stresses.The primary functions of Cd-and TCB-induced proteins included methionine metabolism,Rubisco modification,protein phosphorylation regulation,protein configuration protection,H＋ transmembrane transportation and also the synthesis of ethylene,defense substances and cell wall compounds.展开更多
文摘探讨电离辐射引起小鼠认知功能障碍的可能机制。24只雌性昆明小鼠随机分为对照组和辐照组,辐照组小鼠接受137Csγ射线单次全身辐照至吸收剂量4 Gy。35 d后采用Y迷宫实验检测小鼠认知功能;免疫组织化学法检测小鼠海马区星形胶质细胞(Astrocytes,Ast)标记物胶质纤维酸性蛋白(Glial fibrillary acidic protein,GFAP)阳性细胞数的表达变化;Western blot方法检测海马GFAP蛋白的表达变化;荧光定量PCR检测炎性因子白细胞介素IL-1α、IL-1β、IL-6 mRNA和海马GFAP的表达情况。结果表明:与对照组相比,辐照组小鼠在Y迷宫实验中自发交替率明显降低(78.40±4.16 vs. 67.53±3.08,p<0.05);海马区GFAP阳性细胞数明显增加(133.4±9.6 vs. 280.3±32.7,p<0.01);GFAP蛋白及mRNA表达均显著上调(1.000±0.036vs. 1.300±0.102,p<0.05;1.000±0.031 vs. 1.203±0.078,p<0.05);IL-1α、IL-1β和IL-6 mRNA的表达均明显上调(1.000±0.133 vs. 1.677±0.164,p<0.01;1.000±0.132 vs. 1.488±0.105,p<0.05;1.000±0.218 vs.2.181±0.188,p<0.01)。研究提示,电离辐射可能是通过激活海马Ast诱导炎症因子释放,从而引起认知功能障碍。
基金supported by the National Natural Science Foundation of China (No. 30300026)the Application of Nuclear Techniques in Agriculture from the Chinese Ministry of Agriculture (No. 200803034)
文摘The molecular response of wheat（Triticum aestivum L.,cv.Yangmai 13） seedlings to heavy metal（Cd,Hg） and 1,2,4-trichlorobenzene（TCB） stresses were examined by two-dimensional gel electrophoresis,image analysis,and peptide mass fingerprinting.The results showed inhibitions of root and shoot growth by Cd,Hg,and TCB.These stresses led to water deficit and lipid phosphorylation in the seedling which also promoted protein phophorylation in the leaves.Hg stress inhibited protein synthesis while Cd and TCB stresses induced or up-regulated more proteins in the leaves.Most of these induced proteins played important roles in the biochemical reactions involved in tolerance of wheat to Cd and TCB stresses.The primary functions of Cd-and TCB-induced proteins included methionine metabolism,Rubisco modification,protein phosphorylation regulation,protein configuration protection,H＋ transmembrane transportation and also the synthesis of ethylene,defense substances and cell wall compounds.
