亚低温对脑外伤后细胞凋亡的影响

目的　探讨亚低温对脑外伤后细胞凋亡的影响和可能机制。方法　自由落体法制作大鼠脑外伤模型 ,TUNEL法检测细胞凋亡分布及程度 ,免疫组化法检测Bcl 2和Bax蛋白的表达。结果　细胞凋亡率及Bax蛋白表达率均以对照组最高 ,亚低温治疗组次之 ,而Bcl 2蛋白的表达以假手术组最高 ,亚低温治疗组次之 ,对照组最低。结论　亚低温(33± 0 .5 )℃对脑外伤后细胞凋亡虽具有减弱作用 ,但尚未能达到完全抑制的程度。亚低温对Bcl 2和Bax蛋白表达的影响可能是亚低温减弱脑外伤后细胞凋亡的机制之一     

The development of an OxyHb animal model in mice and the study on OxyHb-induced apoptosis of mouse brain cells in vivo

Objective On the basis of developing a new animal model for oxyhemoglobin (OxyHb) injection into subarachnoid space in mice, this research was to explore the temporal dependence and spatial distribution of OxyHb- induced apoptosis in the mouse brain cells in vivo and the mechanism of neurocyte injury induced by OxyHb. Methods The animal model for OxyHb injection into subarachnoid space in mice was developed. Mice were divided randomly into the experimental group (n=40) and the control group (n= 35). The control group received saline injection (50 μL ) and the experimental group received OxyHb injection (50 μL ), both into the subarachnoid space. The mice of the two groups were subdivided according to different postoperative time (3 h, 6 h, 12 h, 24 h and 48 h). The apoptosis or necrosis of cells was distinguished with microscopy (HE staining), transmission electron microscopy and TUNEL method. Results The distribution of apoptosis was mainly in the ipsilateral neocortex and bilateral hippocampal gyrus. The apoptotic mouse brain cells showed morphological changes in the experimental group by HE staining and transmission electron microscopy. The count of TUNEL-positive cells showed substantial increase in the experimental group, and there was a significant difference between the control and experimental groups, and the number of OxyHb- induced apoptotic cells decreased with time. Conclusion OxyHb in subarachnoid space in mice can induce apoptasis, but not necrosis of mouse brain cells in viro. The apoptotic brain cells show the pattern of temporal dependence and spatial distribution. It is suggested that the early treatment should be the method of first choice for treating the hemorrhagic brain injury.     

肝动脉桥式置管转流对供肝及胆道组织细胞凋亡的保护作用

目的验证肝动脉桥式置管转流这一方法是否能够减轻肝动脉缺血(hepatic artery ischemia,HAI)引起的肝胆细胞凋亡。方法应用简易犬肝自体原位移植模型,将24只杂交犬随机分为肝动脉缺血组(HAI组,8只)、肝动脉桥式置管转流组(TBB组,8只)及对照组(8只)。在制模后,3组动物均于冷灌注后不同时点切取肝脏、胆道组织,分别用戊二醛及40 g/L多聚甲醛溶液固定,进行电镜观察和TUNEL染色,观察肝胆组织形态学改变及细胞凋亡情况,并计算两组的凋亡指数。结果在冷灌注后2 h,HAI组电镜下出现较明显的肝胆细胞凋亡现象;肝动脉桥式置管转流组肝胆细胞凋亡现象少见;对照组难以找到凋亡肝胆细胞。TUNEL法染色切片显示,冷灌注后3组肝胆组织内均有少量凋亡细胞,其凋亡指数相差不大(P>0.05);随冷灌注后时间的延长,3组凋亡细胞的数量均有所增加,但HAI组凋亡指数的升高更为显著,肝动脉桥式置管转流组次之,对照组变化不大,3组间差别有统计学意义(P<0.01)。结论肝动脉桥式置管转流对肝移植时肝动脉缺血所导致的肝胆细胞凋亡具有显著保护作用,应在继续完善改进的基础上实施于临床。     

氨基胍对兔骨关节炎软骨细胞凋亡的影响

目的研究氨基胍对兔骨关节炎软骨细胞凋亡的影响。方法将32只兔子随机分组,正常组未采取任何处理,氨基胍组及模型组行右后肢伸直位管型石膏固定造模,氨基胍组腹腔内注射100 mg/(kg.d)氨基胍硫酸盐溶液,模型组每天腹腔内注射相同体积的生理盐水。分别于4周和8周处死动物,留取标本观察软骨大体形态,切片HE染色观察镜下形态,免疫组化检测iNOS表达,TUNEL法原位检测凋亡。结果与模型组相比,氨基胍组在大体形态、HE切片镜下形态接近于正常组,组化染色显示iNOS表达阳性细胞数显著减少(P<0.05),TUNEL法原位检测显示凋亡阳性细胞数显著减少(P<0.05)。结论氨基胍能有效减少iNOS表达和软骨细胞的凋亡,延缓OA的病情发展。     

人宫颈癌细胞凋亡与Bcl-2表达的研究

目的　探明 Bcl- 2在宫颈癌细胞凋亡过程中的作用。方法　采用 60 Co和顺铂处理体外培养的 3株人宫颈癌细胞株 Hela、Si Ha、RJC,2 4 h后检测细胞凋亡和 Bcl- 2。结果　发现放射线 60Co和顺铂均可以诱发宫颈癌细胞凋亡 ;它们都表达 Bcl- 2 ,其表达率随着细胞凋亡的出现而下降 ;两种因素联合应用后诱导细胞凋亡和降低 Bcl- 2表达的作用增强。结论　 Bcl- 2的表达可能参与了宫颈癌细胞凋亡的调节过程     

抗凋亡基因bcl-2在早期胃癌和癌前病变中的表达

应用免疫组化ＳＰ法对３２ 例早期胃癌及癌旁粘膜和２４ 例慢性萎缩性胃炎中ｂｃｌ ２ 的表达同时进行检测,结果癌旁和慢性萎缩性胃炎中不典型增生、单纯增生、腺体扩张和癌旁肠化均显示ｂｃｌ ２ 高表达,与癌无显著差异（ Ｐ＞ ００５）,应视作癌前病变。ｂｃｌ ２ 在癌前病变和早期胃癌中的表达显著高于周围正常粘膜（ Ｐ＜００１）,提示ｂｃｌ ２ 高表达是胃癌发生的早期事件,在胃癌发生上起着重要作用,可作为胃癌早期诊断的可靠指标     

CONSTRUCTION OF ACTIVE RECOMBINANT CASPASE-3 EUKARYOTIC EXPRESSION PLA SMID AND EFFECT OF r-CASPASE-3 ON APOPTOSIS OF PANCREATIC CARCINOMA CELLS

Ａｓｅｒｉｅｓｏｆｃｙｓｔｅｉｎｅｐｒｏｔｅａｓｅ(ｃａｓｐａｓｅ)ｔｈａｔｐｌａｙｉｍｐｏｒｔａｎｔｒｏｌｅｓｄｕｒｉｎｇｔｈｅｐｒｏｃｅｓｓｏｆｍａｍｍａｌｉａｎｃｅｌｌａｐｏｐｔｏｓｉｓｈａｖｅｂｅｅｎｃｌｏｎｅｄ .Ｃａｓｐａｓｅ 3(ＣＰＰ32 /Ｙａ ｍａ/ａｐｏｐａｉｎ)ｈａｓｂｅｅｎｔｈｏｕｇｈｔｔｏｂｅｔｈｅｋｅｙｐｒｏｔｅａｓｅａｍｏｎｇｃａｓｐａｓｅｆａｍｉｌｙ .Ａｃｔｉｖｅｃａｓｐａｓｅ 3ｃａｎａｆｆｅｃｔｔｈｅｏｔｈｅｒｍｅｍｂｅｒｓｏｆｃａｓｐａｓｅｓｆａｍｉｌｙ ,ｍｏｒｅｏｖｅｒ…     

THE ADAPTABLE CHANGE OF THE FUNCTION OF T LYMPHOCYTES FOR PHYSICAL EXERCISE WITH OXYGEN

T lymphocytes are the main immunocytes withactivity and the degree of the activity can directlyaffect the immunity of human bodies. At the sametime, because the lymphocytes are the most sensi-tive cells to physical exercise, many specialistshave paid more attention to the research on it.Many previous researches have proved that physi-cal exercise could induce the of increasing numberof leukocyte in cycle, especially the number ofmonocytes and the degree of the increase is relatedto the amount …     

扩张型心肌病的自身免疫发病机理研究

本文应用淋巴细胞单克隆抗体,发现扩张型心肌病(DCM)外周血淋巴细胞亚群明显异常;同时用短寿命细胞法发现DCM 的抑制细胞功能明显减低,并与心功能不全之间存在明显的正相关。还发现DCM 患者循环中抗心肌抗体对培养的心肌细胞具有明显的细胞毒效应。DCM 可能是一个与病毒性心肌炎及遗传免疫缺陷有关的自身免疫病.     

SD、E3与DA1U大鼠视网膜光损伤敏感性的差异研究

目的比较SD、E3与DA1U大鼠视网膜光损伤敏感性,为构建不同品系大鼠视网膜光损伤模型和研究眼底色素抗光损伤保护视网膜的相关机制研究提供实验依据。方法成年SD、E3、DA1U大鼠,雌雄随机选取,采用视网膜电图与HE染色分别检测正常情况下与光损伤后不同品系大鼠视网膜感光功能与组织形态变化,采用TUNEL染色观察光损伤后视网膜凋亡细胞的分布与数量。结果正常状态下,SD大鼠色素上皮层、脉络膜层及E3大鼠色素上皮层均无色素分布,而E3大鼠脉络膜层、DA1U大鼠色素上皮层与脉络膜层有褐色色素分布;HE结果显示,在正常状态下,3种品系大鼠视网膜外核层厚度没有显著差异,而在光损伤条件下,SD大鼠视网膜各层细胞均严重受损;视网膜电图结果显示,在正常状态下,不同品系大鼠间视网膜电图视杆细胞反应b波振幅存在显著差异,E3大鼠最大混合反应a波及b波振幅与SD大鼠相比有显著差异,而在光损伤条件下,与SD大鼠相比,E3和DA1U大鼠视网膜电图a波与b波的波幅降幅显著减弱;TUNEL染色结果显示,与SD大鼠相比,E3与DA1U大鼠视网膜内核层及外核层凋亡细胞分布范围与数量均显著下降。结论 SD、E3与DA1U大鼠间存在视网膜色素分布与光损伤敏感性的差异,分布于脉络膜与色素上皮层的色素可能在大鼠抗视网膜光损伤过程中起到重要作用。