Editorial Board of Journal of Medical Colleges of PLA

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Editorial Board of Journal of Medical Colleges of PLA

EDYr0R IN CPll又F 研几、NG Zheng一gu。(王正国)YAO Kai一tai(姚开泰)zHoU shu一石a(周树夏)ZH-U cheng(朱诚) ASSOCIATE EDITOR】N CBIEF HuANG uang一tian(黄良田)sHEN zhi一chao(沈志超)W飞气NG zlleng一ai(王征爱)zHANG Da一chlin(张大春) C()入i爪4ITI王厄MAN BIAN xiu一wu(卞修武)JIANGJi皿城n(蒋建新)xuFu一而ng(许福明) cAI服n一中n(蔡文琴)JL气NG Yuan一厂ng(姜远英)Xu Gang(徐刚) CAO Tie一sheng(曹铁生)JINBo一quan(金伯泉)XULi一xian(徐礼鲜) cHE xiao一yan(车小燕)JU Gong(鞠躬)Xu…     

Treatment of A Case of Spontaneous Rupture of Achille''''s Tendon

Mr.Guo,51 years old,paid his first visit onNovember 7,2001.The patient felt sudden pain inthe right Achille's tendon in June 1999 with noapparent predisposing factors.Several months laterhe palpated a small pitting in the middle of the rightAchille's tendon,which expanded gradually in size.In June 2000,two thirds of the tendon was diagnosedto be ruptured in a local hospital.Ten days later thetendon was ruptured completely when he felt suddensevere pain,numbness and distention,and he wasunable to raise the heel.The lesion was healed three     

Fast estimation of Michaelis-Menten constant of arylesterase with a pair of medi-um concentrations of substrate

Objective: To investigate the reliability for fast estimation of Michaelis-Menten constant (Km) with calibra-ted specific activity at only two medium concentrations of substrate by both simulation and experimentation with aryles-terase (ArE)as model. Methods: Initial rates were simulated by randomly inserting uniform absolute error, and the experimental initial rates of ArE were determined by measuring the increaser of product absorbance. Calibrated specific activities at two substrate concentrations were obtained by regression analysis, and Km was calculated according to Michaelis-Menten equation. Results: By simulation with calibrated specific activities at two medium substrate concen-trations, Km could be calculated according to Michaelis-Menten equation with reasonable precision and accuracy. By experimentation with substrates of 2-naphthyl acetate, phenyl acetate, and p-nitrophenyl acetate, there were no differ-ences between the mean and SD of Km of ArE for either substrate by this linear kinetic method and the Lineweaver-Burk plot. Conclusion: This linear kinetic method was reliable for fast estimation of the Km of some specified enzyme on its substrate of lower solubility or lower sensitivity for quantification by common methods.     

Journal of Medical Colleges of PLA

EDITOR IN CHIEFWANG zheng一邵。(王正国)YAo Kai一tai(姚开泰)zHOU Shu一xia(周树夏)ZHU Cheng(朱诚)ASSOCIATE EDITOR IN CHIEFHUANG Liang一tian(黄良田)SHEN zhi一ehao(沈智超)WANG zheng一ai(王征爱)zHANG Da一ehun(张大春)EDITORLAL BOARDBIAN xiu一wu(卞修武)JIANG Jian一xin(蒋建新)XU Fu一ming(许福明)CAI Wen一qin(蔡文琴)JIANG Yuan一ying(姜远英)XU Gang(徐刚)CAO Tie一sheng(曹铁生)JIN Bo一quan(金伯泉)Xu Li一xian(徐礼鲜)CHE Xiao一yan(车小燕)JU Gong(鞠躬)XU Ru一x…     

The effects of 2-Bromopropane on Viability and Testosterone Production Ability of Rat Leydig Cells in Primary Culture

Epidemiological surveys and animal experiments have shown that 2-bromopropane induces oligozoospermia in exposed workers and inhibits spermatogensis in laboratory animals. However, the mechanism by which 2-bromopropane exerts its effects is unknown. To this end, we examined the formation of testosterone by the Leydig cells and their survival of these cells in the presence of different concentrations of 2-bromopropane in vitro. Leydig cells were isolated following vascular perfusion, enzymatic dissociation and Percoll gradient centrifugation techniques. The cells were cultured in culture dishes. After 8 h, different cultures were exposed to 2-bromopropane at concentrations of 0.01 mmol/L, 0.10 mmol/L and 1.00 mmol/L. In order to stimulate Leydig cells to secrete testosterone, human chorionic gonadotropin (hCG) was also added. Cell viability was determined using the trypan blue dye exclusion test and cell numbers were counted by hemocytometer. Testosterone secretion was detected by radioimmunoassay. The cell viability decreased after exposure to 2-bromopropane in a dose-dependent way, but no morphological change was observed. The cell number decreased in the 2-bromopropane-treated cultures. The secretion of testosterone did not manifest detectable changes in the culture treated with 0.10 mmol/L and 0.01 mmol/L of 2-bromopropane; however, it decreased significantly (P<0.02) in the presence of 1.00 mmol/L. Therefore, our results strongly suggest that 2-bromopropane may exert its cytotoxic effects on Leydig cells in vitro. We speculate that the decrease in the numbers of Leydig cells caused by 2-bromopropane was mediated by a feedback mechanism resulting from a lower testosterone concentration.     

褪黑素对人淋巴细胞姐妹染色单体交换和增殖指数的影响

目的观察褪黑素对体外培养人外周血淋巴细胞的姐妹染色单体交换(SCE)和细胞增殖动力学的影响。方法以33.4μg/L的丝裂霉素(MMC)为阳性对照，0.5％乙醇为阴性对照，用0.01，0.10，1.00mmol/L褪黑素分别预处理细胞后37℃±1℃体外培养72h，观察褪黑素处理组及丝裂霉素加褪黑素处理组细胞的SCE频率和淋巴细胞增殖指数。结果单独用0.01，0.10，1.00mmol/L褪黑素处理组的SCE频率与空白对照组比较，未见有统计学意义，而丝裂霉素加不同浓度褪黑素处理组的SCE频率与阳性对照丝裂霉素处理组比较差别有显著性，呈明显降低。淋巴细胞增殖指数只有1.00mmo1/L褪黑素处理组较空白对照组明显降低。结论褪黑素无遗传毒性，而且在超生理浓度时具有抗诱变作用，并对细胞增殖动力学有一定影响。     

地塞米松对大鼠睾丸间质细胞睾酮分泌的影响及机理研究

目的 观察地塞米松(dexamethasone，DEX)以及DEX和RU486共同作用时对hCG诱导的大鼠间质细胞睾酮分泌的影响和间质细胞中原癌基因c-myb表达的情况，从而探讨DEX的作用机制。方法 用放射免疫方法测定离体大鼠间质细胞的睾酮分泌量；用S-P免疫组织化学方法观察离体大鼠间质细胞中c-Myb蛋白表达的变化。结果 10^-8mol／L的DEX可降低hCG诱导的离体大鼠间质细胞睾酮分泌．并使间质细胞c-Myb蛋白免疫组织化学染色明显下降。上述DEX作用可被糖皮质激素受体功能阻断剂RU486(10μmol／L)所阻断。结论 DEX很可能通过降低间质细胞中c-Myb蛋白表达而抑制hCG诱导的间质细胞睾酮分泌。     

hCG调节原代培养小鼠睾丸Leydig细胞Atrn mRNA和Atrn蛋白的表达及与睾酮分泌的相关性

目的探讨hCG刺激的Leydig细胞睾酮分泌与Atrn mRNA和Atrn蛋白表达的关系。方法将原代培养的Leydig细胞分为5组,分别在培养液中加入0、0．1、1、10、100ng／mLhCG,培养24h后吸取培养液用于测定睾酮分泌量。同时提取细胞mRNA和总蛋白,用实时定量RT—PCR和Westernblot方法分别检测Leydig细胞中AtrnmRNA和Atrn蛋白表达量。结果刺激24h后,与0ng／mLhCG剂量组相比较,0．1,1,10,100ng／mLhCG剂量组睾酮生成量都明显增加,统计学差异较大（P〈0．01）。Leydig细胞AtrnmRNA表达量增加（0．1ng／mLhCG组P〈0．05,其余剂量组P〈0．01）。睾酮生成量与Atrn蛋白表达量（r=0．987,P〈0．01）和AtrnmRNA表达量（r=0．982,P〈0．01）呈正相关。结论原代培养的Leydig细胞在hCG刺激下,睾酮生成量、AtrnmRNA和Atm蛋白表达量都呈现hCG剂量依赖性的增加。     

葡萄糖浓度波动对INS-1细胞胰岛素分泌的影响

目的初探葡萄糖浓度波动对大鼠胰岛素瘤INS-1细胞胰岛素分泌功能影响机制。方法将INS-1细胞随机分为正常糖组（5.5 mmol/L葡萄糖培养液培养）、持续高糖组（16.7 mmol/L葡萄糖培养液培养）、波动组（用16.7 mmol/L葡萄糖培养液培养2 h,再换5.5 mmol/L培养3 h,每天重复3次,夜间9 h维持在5.5 mmol/L的培养液中）、N-乙酰半胱氨酸（N-acetyl-L-cysteine,NAC）＋正常糖组、NAC＋持续高糖组、NAC＋波动组,后3组的培养基中均预先负载终浓度为1.0 mmol/L的NAC,余干预措施相同,均干预72 h。荧光素酶方法检测细胞内三磷酸腺苷（adenosine-triphosphate,ATP）含量,放射免疫分析法测定胰岛素分泌水平。结果 INS-1细胞ATP含量及胰岛素分泌水平在持续高糖组及波动组均较正常糖组显著下降,且波动组下降更明显,差异有高度统计学意义（P〈0.01）。NAC＋波动组及NAC＋持续高糖组细胞ATP含量及胰岛素分泌水平分别较波动组及持续高糖组显著增加,差异有统计学意义（P〈0.05）。结论持续性高糖及波动性高糖损伤INS-1细胞的胰岛素分泌可能与减少细胞ATP含量有关,且波动性高糖较前者更严重,氧化应激可能是波动性高糖及持续性高糖导致INS-1细胞ATP减少的机制。     

硫化氢抑制前列腺癌骨转移PC-3细胞增殖和侵袭的体外研究

目的探讨硫化氢对前列腺癌骨转移PC-3细胞增殖和侵袭的影响及其可能机制。方法分别用0、1、2、4 mmol/LNaHS（硫化氢载体）作用前列腺癌骨转移PC-3细胞36 h,CCK-8比色法法检测细胞存活率,transwell法检测细胞侵袭能力,ELISA法检测细胞MMP-2和MMP-9分泌能力,Western-Blot法检测Bcl-2、Bax蛋白的表达。结果硫化氢对PC-3细胞生长的影响：用硫化氢孵育PC-3细胞36 h,1.0 mmol/L NaHS组细胞存活率与对照组比较,差异无统计学意义（P〉0.05）;2、4 mmol/L NaHS作用PC-3细胞36 h,细胞存活率降低,与对照组比较,能不同程度抑制PC-3细胞的生长,差异有统计学意义（P〈0.05或P〈0.01）。硫化氢对PC-3细胞侵袭的影响：用硫化氢孵育PC-3细胞36 h,1 mmol/L NaHS组细胞侵袭数与对照组比较,差异无统计学意义（P〉0.05）;2、4 mmol/L NaHS作用PC-3细胞36 h,细胞侵袭数减少,与对照组比较,能不同程度抑制PC-3细胞的侵袭,差异有统计学意义（P〈0.05或P〈0.01）。ELISA法检测PC-3细胞MMP-2和MMP-9分泌能力：用硫化氢孵育PC-3细胞36 h,1 mmol/L NaHS组细胞MMP-2和MMP-9分泌量与对照组比较,差异无统计学意义（P〉0.05）;2、4 mmol/L NaHS作用PC-3细胞36 h,MMP-2和MMP-9分泌量减少,与对照组比较,能不同程度抑制PC-3细胞MMP-2和MMP-9的分泌,差异有统计学意义（P〈0.05或P〈0.01）。Western blot检测PC-3细胞Bcl-2/Bax蛋白表达：1、2、4 mmol/L NaHS组,Bcl-2表达降低,Bax表达升高,呈浓度依赖性。结论 2 mmol/L浓度以上的NaHS能影响Bcl-2和Bax表达和MMP-2 MMP-9分泌来抑制PC-3细胞的生长和侵袭。     

非酶糖基化终末产物介导的ERK1/2信号转导通路在大鼠睾丸间质细胞睾酮分泌中的作用

目的：探讨非酶糖基化终末产物(AGEs)对大鼠睾丸间质细胞睾酮分泌的影响及其潜在机制。方法首先,原代培养大鼠睾丸间质细胞,采用3β-HSD免疫细胞化学方法对间质细胞进行鉴定;其次,MTT法测定不同浓度的AGEs (25μg/mL、50μg/mL、100μg/mL、200μg/mL)及200μg/mL BSA作用Leydig细胞后的细胞活力;最后,用不同浓度的AGEs及200μg/mL BSA预处理Leydig细胞12 h,之后更换含相应浓度AGEs或BSA的培养基并加入终浓度为4 U/mL的hCG,其中对照组不含AGEs和BSA,ELISA法和Western blot分别检测睾酮分泌量和p-ERK1/2的表达量。结果 MTT法表明AGEs (≤200μg/mL)对Leydig细胞的活力在本实验所研究的时间内没有影响;ELISA法和Western blot结果显示,不同浓度AGEs处理后,hCG诱导的Leydig细胞睾酮合成量和ERK1/2蛋白的磷酸化都呈现浓度依赖性下降,与对照组相比,差异有统计学意义(P<0.01)。结论 AGEs通过抑制ERK1/2的磷酸化降低大鼠Leydig cells睾酮的分泌。     

睾酮对体外培养小鼠卵巢颗粒细胞分泌抗苗勒管激素的影响

目的 探讨睾酮对体外培养的小鼠卵巢颗粒细胞抗苗勒管激素（anti-Mullerian hormone,AMH） 分泌的影响。方法 小鼠卵巢颗粒细胞原代培养,添加不同浓度睾酮,ELISA 法检测颗粒细胞AMH 的表达。结果 ELISA 法证实颗粒细胞中有AMH 表达,不同浓度（10-8 mmol/L、10-7 mmol/L、10-6 mmol/L） 睾酮作用24 h 可促进颗粒细胞分泌AMH,且随睾酮浓度的增加、作用时间延长,AMH 分泌明显增加（P ＜ 0.01）。结论 睾酮促进小鼠卵巢颗粒细胞分泌AMH,高浓度比低浓度作用更强。     

二苯乙烯苷可抑制中波紫外线诱导的人皮肤成纤维细胞光老化

目的: 研究二苯乙烯苷（TSG）对紫外线B（UVB）诱导的人皮肤成纤维细胞（HSF）应激性提早衰老的作用及可能的机制。方法: UVB小剂量、多次照射HSF,每次照射完毕后分别用0.02、0.10、0.50 mmol/L浓度的TSG处理。实验分为6组：空白对照组、模型对照组、UVB+0.02 mmol/L TSG组、UVB+0.10 mmol/L TSG组、UVB+0.50 mmol/L TSG组、TSG对照组。采用细胞计数法（CCK-8）检测细胞增殖活性;细胞化学染色法检测衰老相关β-半乳糖苷酶（SA-β-gal）表达;TBA法、WST-1法测定细胞丙二醛（MDA）含量和超氧化物歧化酶（SOD）活性;ELISA法测定细胞上清液中基质金属蛋白酶-1（MMP-1）的含量变化。结果: 与空白对照组比较,模型对照组细胞增殖活性减弱（P < 0.05）,SA-β-gal染色呈强阳性,细胞裂解液中SOD活性减弱、MDA含量增加,MMP-1浓度升高（P < 0.05或P < 0.01）。与模型对照组比较,UVB+各浓度TSG组细胞增殖活性改善（均P < 0.05）,SA-β-gal染色阳性率下降,细胞裂解液中SOD活性增强、MDA含量减少,MMP-1浓度减小（P < 0.05或P < 0.01）。结论: TSG可以在一定程度上抑制UVB诱导的HSF应激性提早衰老,该作用可能与改善氧化应激、抑制MMP-1高表达有关。