目的观察S-腺苷甲硫氨酸对血小板源性生长因子m RNA表达及对血管平滑肌细胞(VSMCs)增殖与迁移的影响。方法于2015年3月—2016年3月在大连大学附属中山医院实验中心将8周龄SD大鼠30只分为空白对照组10只、对照组10只和SAMe组10只。造模后...目的观察S-腺苷甲硫氨酸对血小板源性生长因子m RNA表达及对血管平滑肌细胞(VSMCs)增殖与迁移的影响。方法于2015年3月—2016年3月在大连大学附属中山医院实验中心将8周龄SD大鼠30只分为空白对照组10只、对照组10只和SAMe组10只。造模后SAMe组腹腔内注射SAMe[15 mg/(kg·d)],对照组注射相同剂量的生理盐水,观察大鼠正常颈动脉内膜损伤前后VSMCs基因甲基化差异、颈动脉管腔面积及内膜/中膜面积比值、测定VSMCs增殖、各组细胞PDGF m RNA表达水平。结果大鼠颈动脉内膜损伤后VSMCs的PDGF启动子去甲基化。对照组和SAMe组VSMCs迁移距离分别为(645±143)m和(468±87)m;对照组和SAMe组VSMCs 490nm吸光度A值分别为(2.47±0.64)nm和(1.92±0.52)nm;PDGF m RNA表达的相对比值(PDGF/GAPDH),对照组和SAMe组分别为(1.63±0.52)和(0.64±0.20);对照组和SAMe治疗组大鼠颈动脉内膜面积分别(0.468±0.092)mm2和(0.275±0.064)mm2,管腔面积分别为(0.437±0.087),(0.635±0.104)mm2,SAMe组管腔面积大于对照组(P<0.01)。两组情况比较,差异有统计学意义(P<0.05)。结论大鼠颈动脉内膜损伤引起VSMCs中PDGF启动子去甲基化,SAMe抑制VSMCs中PDGF m RNA表达和VSMCs增殖和迁移。展开更多
We analyzed the properties and structures of the hydrogen-bonded complexes of tetrahydrofuran（THF） and water by means of experimental Raman spectra and ab initio calculations.The optimized geometries and vibrational...We analyzed the properties and structures of the hydrogen-bonded complexes of tetrahydrofuran（THF） and water by means of experimental Raman spectra and ab initio calculations.The optimized geometries and vibrational frequencies of the neat THF molecule and its hydrogen-bonded complexes with water（THF/H2O） were calculated at the MP2/6-311＋G（d,p） level of theory.We found that the intermolecular hydrogen bonds which are formed from the binary mixtures of the neat THF and water with different molar ratios could explain the changes in wavenumber position and linewidth very well.The combination of ab initio calculations and experimental Raman spectral data provides an insight into the hydrogen bonds leading to the concentration dependent changes in the spectral features.展开更多
A mechanism about the origin of the selectivities for the cleavage of dioxolane five-membered rings on pyranoside rings was suggested. Quantum chemical studies were performed to testify the rationality of the mechanis...A mechanism about the origin of the selectivities for the cleavage of dioxolane five-membered rings on pyranoside rings was suggested. Quantum chemical studies were performed to testify the rationality of the mechanism. It is thus suggested that the selectivities should be dependent on the differences of the free energy at the transition states when the five-membered ring cleaves. Natural bond orbital（NBO） analysis was further made to assess the influence of stereoelectronic effects on the selectivities.展开更多
文摘目的观察S-腺苷甲硫氨酸对血小板源性生长因子m RNA表达及对血管平滑肌细胞(VSMCs)增殖与迁移的影响。方法于2015年3月—2016年3月在大连大学附属中山医院实验中心将8周龄SD大鼠30只分为空白对照组10只、对照组10只和SAMe组10只。造模后SAMe组腹腔内注射SAMe[15 mg/(kg·d)],对照组注射相同剂量的生理盐水,观察大鼠正常颈动脉内膜损伤前后VSMCs基因甲基化差异、颈动脉管腔面积及内膜/中膜面积比值、测定VSMCs增殖、各组细胞PDGF m RNA表达水平。结果大鼠颈动脉内膜损伤后VSMCs的PDGF启动子去甲基化。对照组和SAMe组VSMCs迁移距离分别为(645±143)m和(468±87)m;对照组和SAMe组VSMCs 490nm吸光度A值分别为(2.47±0.64)nm和(1.92±0.52)nm;PDGF m RNA表达的相对比值(PDGF/GAPDH),对照组和SAMe组分别为(1.63±0.52)和(0.64±0.20);对照组和SAMe治疗组大鼠颈动脉内膜面积分别(0.468±0.092)mm2和(0.275±0.064)mm2,管腔面积分别为(0.437±0.087),(0.635±0.104)mm2,SAMe组管腔面积大于对照组(P<0.01)。两组情况比较,差异有统计学意义(P<0.05)。结论大鼠颈动脉内膜损伤引起VSMCs中PDGF启动子去甲基化,SAMe抑制VSMCs中PDGF m RNA表达和VSMCs增殖和迁移。
基金Supported by the National Natural Science Foundation of China(Nos.20303007,20333050,20973077)the Program for New Century Excellent Talents in University,China and the Graduate Innovation Fund of Jilin University,China(No.20101046)
文摘We analyzed the properties and structures of the hydrogen-bonded complexes of tetrahydrofuran（THF） and water by means of experimental Raman spectra and ab initio calculations.The optimized geometries and vibrational frequencies of the neat THF molecule and its hydrogen-bonded complexes with water（THF/H2O） were calculated at the MP2/6-311＋G（d,p） level of theory.We found that the intermolecular hydrogen bonds which are formed from the binary mixtures of the neat THF and water with different molar ratios could explain the changes in wavenumber position and linewidth very well.The combination of ab initio calculations and experimental Raman spectral data provides an insight into the hydrogen bonds leading to the concentration dependent changes in the spectral features.
基金Supported by the National Natural Science Foundation of China（No.20973077）, the Program for New Century Excellent Talents in University of China（No.NCET-07-0358） and the Brain Gain Fund of Huazhong University of Science and Technology, China.
文摘A mechanism about the origin of the selectivities for the cleavage of dioxolane five-membered rings on pyranoside rings was suggested. Quantum chemical studies were performed to testify the rationality of the mechanism. It is thus suggested that the selectivities should be dependent on the differences of the free energy at the transition states when the five-membered ring cleaves. Natural bond orbital（NBO） analysis was further made to assess the influence of stereoelectronic effects on the selectivities.
