升压治疗急性脑缺血再灌注损伤保护作用的实验研究

目的:探讨升压治疗局灶性脑缺血的保护作用及治疗的维持时间。方法:采用大鼠局灶性脑缺血再灌注模型,40只大鼠随机分为五组:模型对照组(A)、升压维持15min组(B)、维持45min组(C)、维持90min组(D)和120min组(E),观察各组神经功能评分、脑梗死体积和病理学改变。结果:神经功能缺损评分B、C、D组明显低于A组;B、C、D、E各组脑梗死体积明显低于A组,C、D、E组明显低于B组;各治疗组组织病理学改变比对照组轻,B组最轻。结论:缺血3h再灌注时,升压维持时间在2h以内对脑损伤有保护作用,升压最佳维持时间是15min。     

An animal model of SARS produced by infection of Macaca mulatta with SARS coronavirus

A new SARS animal model was established by inoculating SARS coronavirus (SARS-CoV) into rhesus macaques (Macaca mulatta) through the nasal cavity. Pathological pulmonary changes were successively detected on days 5-60 after virus inoculation. All eight animals showed a transient fever 2-3 days after inoculation. Immunological, molecular biological, and pathological studies support the establishment of this SARS animal model. Firstly, SARS-CoV-specific IgGs were detected in the sera of macaques from 11 to 60 days after inoculation. Secondly, SARS-CoV RNA could be detected in pharyngeal swab samples using nested RT-PCR in all infected animals from 5 days after virus inoculation. Finally, histopathological changes of interstitial pneumonia were found in the lungs during the 60 days after viral inoculation: these changes were less marked at later time points, indicating that an active healing process together with resolution of an acute inflammatory response was taking place in these animals. This animal model should provide insight into the mechanisms of SARS-CoV-related pulmonary disease and greatly facilitate the development of vaccines and therapeutics against SARS.     

db-cAMP对转化细胞增殖抑制及其对CaM水平和PKⅡ活性的影响

目的　探讨双丁酰 环核苷酸 (db cAMP)对转化细胞增殖及细胞表型作用的机理。　方法　以流式细胞光度术 (flowcytometry ,FCM)、软琼脂集落形成、放射免疫、Northern印迹和激酶活性分析等方法观察db cAMP对转化的C3H1 0 T1 2 小鼠成纤维细胞增殖、细胞表型、钙调素 (calmodulin ,CaM)表达及蛋白激酶Ⅱ (proteinkinaseⅡ ,PKⅡ )活性的影响。　结果　db cAMP(1mmol L)使C3H1 0 T1 2 转化细胞增殖及软琼脂集落形成能力受到显著抑制 ,转化细胞中CaM的表达及PKⅡ活性明显高于正常细胞 ,经db cAMP处理后也受到明显抑制。　结论　细胞转化及cAMP的诱导分化作用与PKⅡ活性的改变有密切相关性     

层粘连蛋白受体、Ⅳ型胶原的表达及微血管密度与乳腺癌转移的关系

目的：探讨乳腺癌组织层粘连蛋白受体（LN－R）、Ⅳ型胶原（Col Ⅳ)、间质微血管密度与乳腺癌淋巴结转移的关系。方法：应用免疫组织化学S－P方法标记82例乳腺癌组织中LN－R、Col Ⅳ、FⅧRAg，并在第Ⅷ因子相关抗原（FⅧRAg)标记切片上计算微血管密度（MVD）。结果：LN－R表达强度及MVD的高低在乳腺癌有淋巴结转移组和无淋巴结转移组间有差异；ColⅣ在两组间无差异。结论：乳腺癌间质微血管密度增加及LN－R表达增强可作为预测肿瘤转移及判断预后的指标。     

mPEG表面修饰的PLGA嵌段共聚物的血液相容性评价

本实验室设计合成了三种不同LA／GA比例的mPEG修饰PLGA（PELGA，含15％mPEG），为了评价它们的血液相容性，我们以硅化玻璃试管为阴性对照，未硅化的试管为阳性对照，参照国际标准（ISO10993）和《中华人民共和国国家标准GB／T16886医疗器械生物学评价》方法进行了体外评价实验。试验包括溶血率实验，血小板黏附实验，动态凝血时间实验，凝血时间实验，血浆复钙时间实验和凝血酶原时间实验等综合评价指标。结果表明，合成材料具有优良的血液相容性，材料制成的纳米粒有望应用于静脉注射。     

Expression and changes of HSP70 in the rat forebrain subjected to gamma knife (100Gy) irradiation targeted on the caudate putamen and survived for different times

Forebrain heat shock protein 70 (HSP70) immunohistochemical reactivity was investigated in rats subjected to gamma knife irradiation focusing on the right caudate putamen nucleus. The forebrain sections of all experimental animals were processed with anti-HSP70 antiserum and then by avidin-biotin peroxidase complex immunohistochemistry after gamma ray irradiation with a dose of 100Gy and they each survived for different times (from 30 min to 30 days). Some neurons, glial cells, and endothelial cells were HSP70-like immunoreactivity (HSP70-LI) positive. HSP70-LI was mainly distributed in the target area of irradiation, as well as in non-target regions, e.g. the cortex, hippocampus, and hypothalamus, etc. The expression and change of HSP70-LI from 3 h to 30 days after irradiation followed the following rules: (1) Within 3 to 24 h, the dilated vessels with HSP70-LI endothelial cells were found at first, and a few lightly stained HSP70-LI neurons and glias were observed in the target and non-target regions; (2) In 3-7 days, darkly stained HSP70-LI neurons and glias were apparently increased and formed an expression peak. From 14 to 30 days, HSP70-LI cells were distinctly decreased and became weakly stained or negative. These results suggested that although the irradiation target of the gamma knife was localized, the response to irradiation occurred extensively.     

^32P局部照射预防猪冠状动脉再狭窄研究

目的：评价^32P灌注球囊预防再狭窄的有效性、可行性和安全性。方法：对猪冠状动脉左前降支行过度球囊扩张术后,治疗组以^32P作血管内照射,对照组作假照射。术后35d收获目标血管、检测血管形态、细胞增殖百分比等。结果：治疗组血管腔面积较对照组明显增大（P＜0．01）,新生内膜面积、血管狭窄程度和各层PCNA阳性细胞明显减小（P均＜0．01）。结论：^31P灌注球囊照射预防冠状动脉再狭窄有效、安全而且可行。     

中老年男性血糖与血清脂质及载脂蛋白的关系

目的　研究血糖水平与脂质及载脂蛋白水平的关系。方法　对成都地区 735例 40～ 70岁男性空腹 12～ 14小时的血糖、血清甘油三酯 (TG)、胆固醇 (TC)、高密度脂蛋白胆固醇 (HDL- C)、低密度脂蛋白胆固醇(L DL- C)和血清载脂蛋白 (apo) A 、A 、B10 0、C 、C 及 E含量进行了测定。依空腹血糖的水平将受试对象分为正常组 (S1)、糖耐量减退组 (S2 )、糖尿病组 (S3)。结果　结果显示 :S2和 S3的高脂血症发病率比 S1高 (分别为64.5 %、45 .2 %和 32 .1% ) ;空腹 TG水平 S2 (3.62± 2 .5 2 mm ol/ L)和 S3(4 .45± 3.82 mmol/ L)均显著高于 S1(1.92± 1.93m mol/ L) ,P均 <0 .0 1;TC水平 S2 (5 .68± 1.15 mmol/ L)和 S3(5 .68± 1.12 m mol/ L)亦显著高于 S1(5 .13±1.0 6m mol/ L) ,P均 <0 .0 5 ;S2和 S3的血清 apo B10 0、C 、C 及 E水平显著高于 S1(P均 <0 .0 1或 P<0 .0 5 )。相关分析表明 ,血糖与血清 TG在 S1、S2和 S3中均呈显著正相关 (r分别为 0 .180 0、0 .1436和 0 .32 12 ) ,P均 <0 .0 0 1;而在 S2和 S3中血糖与 HDL- C呈负相关 (r分别为 - 0 .2 5 34和 - 0 .1477) ,P均 <0 .0 0 1;在 S1、S2、S3组中血糖与血清 apo B10 0、C 及 E呈正相关 (P均 <0 .0 0 1) ,与 apo C 则在 S1和 S2中呈正相关 (P<0