大肠癌P53蛋白PCNA和CEA的表达与淋巴结转移的关系

目的研究大肠癌Ｐ５３蛋白、增殖细胞核抗原（ＰＣＮＡ）和ＣＥＡ的表达与淋巴结转移的关系．方法应用链霉菌素生物素（ＳＰ）免疫组化法，观察４４例大肠癌Ｐ５３，ＰＣＮＡ的阳性率和ＣＥＡ的表达型式．结果大肠癌Ｐ５３阳性率为５２３％；大肠癌Ｐ５３阳性表达与性别、年龄及肿瘤的部位、分化程度和浸润深度无关（Ｐ＞００５）；大肠癌Ｐ５３阳性者其淋巴结转移率较阴性者高（１４／２３，６０９％ｖｓ６／２１，２８６％，Ｐ＜００５）；Ｐ５３阳性表达及有淋巴结转移者其细胞增殖活性分别较Ｐ５３阴性表达及无淋巴结转移者高（５５９±１７ｖｓ３７９±１４，Ｐ＜００５；５６２±１５ｖｓ３９６±１７，Ｐ＜００５）；Ｐ５３阳性表达及有淋巴结转移者其ＣＥＡ表型均以胞质型和间质型为主（２１／２３，９１３％ｖｓ１３／２１，６１９％，Ｐ＜００５；１９／２０，９５０％ｖｓ１５／２４，６２５％，Ｐ＜００５）．结论检测Ｐ５３和ＰＣＮＡ表达及ＣＥＡ表型对判断大肠癌的恶性程度，预测其淋巴结转移趋势和预后及指导临床治疗有重要价值．     

原发性肝癌组织P16蛋白的缺失与HBV感染

目的研究Ｐ１６蛋白缺失与原发性肝癌发生发展的关系以及ＨＢＶ感染与Ｐ１６蛋白缺失的相关性．方法用免疫组化技术（ＬＳＡＢ法）检测７０例原发性肝癌组织标本中的Ｐ１６蛋白和ＨＢｓＡｇ．结果有６０６％（４０／６６）的肝细胞癌（ＨＣＣ）和７５０％（１／４）的胆管细胞癌（ＣＣＣ）Ｐ１６蛋白缺失；Ⅰ，Ⅱ，Ⅲ和Ⅳ级（按Ｅｄｍｏｎｄｓｏｎ标准）ＨＣＣＰ１６蛋白缺失率分别为００％（０／１），４４１％（１５／３４），８２１％（２３／２８）和６６７％（３／４），组间差异显著（Ｐ＜００５）．在有癌旁肝组织的４８例标本中，癌组织Ｐ１６蛋白阴性率（７２６％）明显高于癌旁肝组织（４１２％，Ｐ＜００５）．有６２５％（３０／４８）的ＨＣＣ癌旁肝组织ＨＢｓＡｇ阳性．ＨＢｓＡｇ阳性病例与阴性病例的Ｐ１６阴性率分别为７３３％（２２／３０）和６６７％（１２／１８），差异无显著性（Ｐ＞００５）．结论Ｐ１６蛋白缺失与原发性肝癌相关，与肝癌的恶性发展关系密切，可能对预后有重要影响．ＨＢＶ感染与Ｐ１６蛋白缺失无明显相关性．     

人肝细胞癌和癌旁组织中性激素受体的改变

目的探讨肝细胞癌（ＨＣＣ）患者癌组织与癌旁组织中雄、雌激素受体的变化．方法用葡聚糖包裹活性炭吸附法检测２１例ＨＣＣ患者的癌组织和癌旁组织中雄激素受体（ＡＲ）和雌激素受体（ＥＲ），同时测量７例男性肝硬变患者肝组织中的ＡＲ和ＥＲ．结果癌组织中ＡＲ阳性率（７１４％）显著高于癌旁组织（３１３％）（Ｐ＜００１）及硬变肝组织（Ｐ＜００５）中的ＡＲ阳性率（２８６％），而ＥＲ含量均无显著差异（Ｐ＞００５）．结论ＡＲ表达的增加与肝细胞的癌变有关，部分ＨＣＣ具有雄激素依赖性，为ＨＣＣ可能的内分泌治疗提供分子生物学方面的理论依据．     

单克隆抗体SC3A在胃癌及癌前病变的表达意义

目的研究单克隆抗体ＳＣ３Ａ在胃癌及癌前病变的表达意义．方法应用免疫组化ＡＢＣ法及粘液组化染色检测１０１例胃良恶性病变组织中ＳＣ３Ａ的表达．结果胃癌７１例中ＳＣ３Ａ阳性５７例（８０３％），但与癌组织类型、分化程度、转移及术后生存率无明显关系．ＳＣ３Ａ阳性率在酸性粘液（＋）组胃癌明显高于酸性粘液（－）组（９０２％对２００％，Ｐ＜００１），硫酸粘液（＋）组胃癌明显高于硫酸粘液（－）组（９１３％对６００％，Ｐ＜００１）．而且癌旁肠化硫酸粘液阳性率明显较良性病变伴肠化高（８８９％对３５３％，Ｐ＜００１）；硫酸粘液（＋）组肠化ＳＣ３Ａ阳性率明显高于硫酸粘液（－）组（６０９％对３１３％，Ｐ＜００５）．结论单克隆抗体ＳＣ３Ａ的表达对胃癌诊断及组织发生探讨有一定意义．     

大肠癌EGF受体表达对细胞增殖的影响

目的研究ＥＧＦ受体（ＥＧＦＲ）在大肠癌中表达的意义，并探讨其对细胞增殖的影响．方法用免疫组化ＬＳＡＢ法检测８６例大肠癌组织ＥＧＦＲ，ＰＣＮＡ的表达．结果在８６例被检组织中，ＥＧＦＲ阳性表达４４例（５１２％），低分化癌（８００％，４０／５０）、淋巴结转移癌（６８８％，２２／３２）较高分化（３８９％，１４／３６）、淋巴结未受累大肠癌（４０７％，２２／５４）有更高的ＥＧＦＲ表达（Ｐ＜００５）．ＤｕｋｅｓＡ，Ｂ，Ｃ期大肠癌的ＥＧＦＲ表达率分别为３２０％，４８３％，６８８％，Ｃ期与Ａ期比较差异显著；ＥＧＦＲ阳性大肠癌较阴性癌有更高的ＰＣＮＡ标记（两者ＰＣＮＡⅠ，Ⅱ，Ⅲ，Ⅳ级的例数分别为４，８，１７，１５；１４，１６，７，５；Ｐ＜００５）．结论ＥＧＦＲ过表达与大肠癌恶性程度、转移趋势密切相关，并可促使癌细胞过度增生．     

PCR检测HBV感染患者血清HBV DNA的临床意义

目的探讨急、慢性乙型肝炎及与ＨＢＶ感染相关的肝硬变和肝癌患者血清ＨＢＶＤＮＡ的临床意义．方法应用ＰＣＲ技术检测不同ＨＢＶ感染２０５例，患者血清ＨＢＶＤＮＡ，并与正常人２０例作比较．结果ＨＢＶ感染患者２０５例血清ＨＢＶＤＮＡ阳性率为６９３％，慢性乙肝、乙肝后肝硬变和肝癌患者的阳性率分别为７６４％，７１９％和７００％，显著高于急性乙肝患者２１７％的阳性率（Ｐ＜００１）；ＨＢｅＡｇ（＋）患者血清ＨＢＶＤＮＡ阳性率为９３６％，显著高于ＨＢｅＡｇ（－）抗ＨＢｅ（＋）／（－）和ＨＢｓＡｇ（－）患者的阳性率（４５６％，２５０％和１２５％，Ｐ＜００１）；血清ＨＢＶＤＮＡ阳性和阴性两组患者的血清ＡＬＴ水平无明显差异（Ｐ＞００５）．结论血清中ＨＢＶＤＮＡ持续存在可能与乙型肝炎的慢性化有关，而与ＨＢＶ感染患者的肝损伤无明显关系     

原发性肝癌血清性激素及组织性激素受体的研究

目的研究人体性激素水平变化与原发性肝细胞癌的关系．方法应用放免法测定肝癌组（２０例），肝硬变组（１６例）及正常对照组（２０例）血清雌二醇（Ｅ２）及睾酮（ＴＴＴ）含量，并用放免组化法（ＰＡＰ法）检测肝癌组织及肝硬变组织的雌二醇受体（ＥＲ）及睾酮受体（ＡＲ）含量．结果肝癌组血清Ｅ２含量（４４５５±９３１ｎｇ／Ｌ）明显高于正常对照组（７６６ｎｇ／Ｌ±１７０ｎｇ／Ｌ）而低于肝硬变组（６４９６ｎｇ／Ｌ±１７６ｎｇ／Ｌ）（Ｐ＜００１）；前者ＴＴＴ含量（２５３３００ｎｇ／Ｌ±５６５６０ｎｇ／Ｌ）明显低于后二者（４５８５８０ｎｇ／Ｌ±３４９６０ｎｇ／Ｌ）（Ｐ＜００１）．肝癌组织ＥＲ（８０％）较肝硬变时（４４％）明显增加（Ｐ＜００２５），且与血清Ｅ２含量有明显负相关关系（ｒ＝－０８４７３，Ｐ＜０００１）．ＡＲ阳性百分率在两者无明显差别（ｒ＝－０３１３５，Ｐ＞００５）．结论血清ＴＴＴ含量改变及肝组织ＡＲ浓度改变与肝癌无明显关系，而血清Ｅ２含量改变及肝组织ＥＲ浓度改变与肝癌的发生、发展有密切关系．提示原发性肝细胞癌是一雌激素依赖性肿瘤．     

表皮生长因子受体和PCNA在食管癌及癌前病变组织中的表达意义

目的探讨ＥＧＦＲ及ＰＣＮＡ的表达在食管癌发生发展过程中的临床意义．方法采用免疫组化ＳＰ法对各级食管鳞癌（Ⅰ级ｎ＝１８，Ⅱ级ｎ＝３０，Ⅲ级ｎ＝２２）、各级不典型增生（轻度ｎ＝１４，中度ｎ＝１７，重度ｎ＝１３）及正常食管粘膜（ｎ＝２０）进行ＥＧＦＲ及ＰＣＮＡ检测．结果ＥＧＦＲ及ＰＣＮＡ阳性表达在各组食管病变中呈明显递增趋势，正常组、轻度及中度不典型增生组间ＥＧＦＲ及ＰＣＮＡ表达均有显著性差异，ＥＧＦＲ阳性表达分别为：０／２０，３／１４及１０／１７；ＰＣＮＡⅠ，Ⅱ，Ⅲ，Ⅳ级表达分别为：１９／２０，１／２０，０／２０，０／２０；７／１４，６／１４，１／１４，０／１４；２／１７，７／１７，７／１７，１／１７（Ｐ＜００５）．鳞癌Ⅰ，Ⅱ级组间ＰＣＮＡ表达有显著性差异，ＰＣＮＡⅠ，Ⅱ，Ⅲ，Ⅳ级表达分别为１／１８，７／１８，８／１８，２／１８；２／３０，５／３０，８／３０，１５／３０（Ｐ＜００５）；而中、重度不典型增生与Ⅰ级鳞癌组间均无显著性差异（Ｐ＞００５）．结论食管中重度不典型增生者，其基因表达及增殖特性已具有明显的潜在恶性趋势，与食管癌的发生有直接关系，临床应对这类病例积极治疗并密切随访，以防癌变     

p53 C-myc和P-gp蛋白在胃癌细胞中表达

目的研究胃癌组织中ｐ５３和Ｃｍｙｃ的表达与多药耐药性（ＭＤＲ）的关系．方法应用ＬＳＡＢ免疫组织化学方法研究６７例（男４１例，女２６例，平均年龄４６±１５８岁）胃癌标本中ｐ５３，Ｃｍｙｃ和Ｐｇｐ的表达．结果本组胃癌中ｐ５３阳性３２例（４７８％），Ｃｍｙｃ阳性３７例（５５２％），Ｐｇｐ阳性３９例（５８２％）．淋巴结转移阳性胃癌ｐ５３阳性率（５６９％）和Ｃｍｙｃ阳性率（６４７％）显著高于淋巴结转移阴性的胃癌（Ｐ＜００５）．ｐ５３的异常表达与ｍｄｒ１基因表达呈显著正相关（ｒ＝０６３，Ｐ＜００５），而Ｃｍｙｃ和ｍｄｒ１的表达无明显相关．结论ｐ５３异常表达可增加ｍｄｒ１基因的表达，从而使胃癌细胞获得ＭＤＲ表型     

增殖细胞核抗原在大肠癌中的表达意义

目的研究大肠癌组织中ＰＣＮＡ的表达意义．方法大肠癌组织６３例，其中结肠癌２３例，直肠癌４０例；男３３例，女３０例；年龄２６岁～７６岁．用抗人ＰＣＮＡ单克隆抗体和ＳＰ免疫组化技术半定量测定了ＰＣＮＡ在大肠癌组织中的表达，并分析了其与肿瘤分化、侵袭和淋巴结转移间的关系．结果高分化组ＰＣＮＡ阳性Ⅰ～Ⅳ级例数分别为１２，２，３，３，中分化组为８，７，４，２，低分化组为５，３，６，８．经Ｒａｄｉｔ统计学分析及显著性检验，低分化大肠癌中ＰＣＮＡ的表达显著高于高、中分化大肠癌（Ｐ＜００５，Ｐ＜００５）；其表达与肿瘤的侵袭和淋巴结转移无关（Ｐ＞００５，Ｐ＞００５）．结论ＰＣＮＡ的表达可反映大肠癌细胞的增殖活性，是大肠癌增殖生物学行为的有用指标．     

胃十二指肠疾病患者骨矿物质含量的变化意义

目的研究慢性胃炎、胃十二指肠溃疡和胃癌患者骨矿物质含量变化的意义．方法用单光子吸收法，以桡骨长度中下１／３处为测定点，测定慢性胃炎（ｎ＝３１）、消化性溃疡（ｎ＝２６）、胃癌（ｎ＝９）及正常对照组（ｎ＝４３）的骨矿物质含量，并以骨矿含量（ＢＭＣ，ｇ／ｃｍ）及骨面密度（ＢＭＣ／ＢＷ，ｇ／ｃｍ２）表示，并进行比较．结果慢性萎缩性胃炎（ｎ＝１４），ＢＭＣ＝１００８±０２２８ｇ／ｃｍ）和十二指肠球部溃疡（ｎ＝１６），ＢＭＣ＝０９０４ｇ／ｃｍ±０２０５ｇ／ｃｍ，ＢＭＣ／ＢＷ＝０６５２ｇ／ｃｍ２±００８６ｇ／ｃｍ２）骨矿含量显著低于正常对照组（ｎ＝４３，ＢＭＣ＝１１７６ｇ／ｃｍ±０３４１ｇ／ｃｍ，ＢＭＣ／ＢＷ＝０７８２ｇ／ｃｍ２±０１３４ｇ／ｃｍ２，Ｐ＜００５）．结论萎缩性胃炎及十二指肠溃疡患者ＢＭＣ明显下降，需纠正．     

胃癌及消化性溃疡患者胃窦粘膜胃肠激素的变化

目的探讨胃癌及消化性溃疡（ＰＵ）患者胃窦粘膜胃肠激素变化的意义．方法内镜及活检确诊的浅表性胃炎（ＣＳＧ）１０例，胃溃疡（ＧＵ）１５例，十二指肠溃疡（ＤＵ）１２例，胃癌（ＧＣ）６例．胃镜下取胃窦粘膜，用ＲＩＡ法测定胃泌素（Ｇａｓ）、生长抑素（ＳＳ）、Ｐ物质（ＳＰ）的含量，各组间进行比较．结果胃窦粘膜ＳＳ含量在ＧＵ，ＤＵ，ＣＳＧ，ＧＣ组分别为２５１ｐｇ／ｍｇ±１９４ｐｇ／ｍｇ（以下同），４７０±１７９，５３２±２１１及１２９３±５２３。其中ＧＵ组低于其余各组（Ｐ＜００５），而ＧＣ时则显著升高（Ｐ＜００１）．ＳＰ含量在ＤＵ组显著降低，与ＧＵ，ＣＳＧ，ＧＣ比较分别为４７９±１５７ｖｓ７６５±４１５，７８９±３９０及８０１±３４６，Ｐ＜００５；ＧＣ患者Ｇａｓ水平显著高于ＣＳＧ组，为４６４５±２９４４，ｖｓ２７６８±１５７２，Ｐ＜００１．结论胃粘膜中Ｇａｓ，ＳＳ，ＳＰ含量的变化可能在ＰＵ及胃癌的发病机理中起重要作用．     

幽门螺杆菌感染患者胃氨的变化

目的探讨由Ｈｐ产生的氨在Ｈｐ致病机理中的作用．方法对１６例伴有Ｈｐ感染的消化性溃疡及慢性活动性胃炎患者，应用抗菌素对症治疗４周．分别在治疗前后用尿素酶试剂药盒检查Ｈｐ感染情况，并用Ｎｅｓｌｅｒ′ｓ显色法测定治疗前后的胃液氨浓度．结果治疗后有８例患者Ｈｐ阴转，胃氨浓度由治疗前的３０５７±１９６５μｍｏｌ／Ｌ降至１７６９±９７８μｍｏｌ／Ｌ（Ｐ＜００１），同时胃粘膜病变减轻或治愈．结论氨是Ｈｐ致病的重要因素之一．动态测定胃氨浓度可以间接反映Ｈｐ的感染情况，并可以作为判定治疗效果的一项指标．     

Influence of fever on biliary elements of guinea pigs

ＩｎｆｌｕｅｎｃｅｏｆｆｅｖｅｒｏｎｂｉｌｉａｒｙｅｌｅｍｅｎｔｓｏｆｇｕｉｎｅａｐｉｇｓＬüＨｏｕＤｏｎｇ１，ＴＩＡＮＭｉｎｇＧｕｏ２，ＺＨＡＮＧＸｉａｏＰｅｎｇ２ａｎｄＬＩＨｕａｉＬａｎ３１ＤｅｐａｒｔｍｅｎｔｏｆＭｉｃｒｏｂｉｏｌｏｇｙ...     

食管癌组织CD15抗原和组织蛋白酶D表达的关系

目的探讨CD15抗原和组织蛋白酶D(Cath-D)在食管癌的表达意义及其相互关系.方法应用微波-LSAB免疫组化法,观察65例食管癌组织(男46例,女19例;平均年龄54岁;均为鳞癌)中CD15和Cath-D的表达阳性率及其相互关系.结果食管癌CD15和CD阳性率分别为58%(38/65例)和65%(42/65例);食管癌CD15和Cath-D表达与性别、年龄、肿瘤部位、大体类型及肿瘤大小无关(P＞0.05).CD15和Cath-D表达阳性率:鳞癌Ⅲ级(88%,14/16 vs 100%,16/16)均显著高于鳞癌Ⅰ级(43%,6/14 vs 50%,7/14)和鳞癌Ⅱ级(51%,18/35 vs 54%,19/35,P＜0.05);外膜层浸润(74%,20/27 vs82%,22/27)显著高于肌层浸润(47%,18/38 vs 53%,20/38,P＜0.05);有淋巴结转移组(72%,26/36 vs 78%,28/38)显著高于无淋巴结转移组(41%,12/29 vs 48%,14/29,P＜0.025);死亡组(70%,31/44 vs 77%,34/44)显著高于五年生存组(33%,7/21 vs 38%,8/21,P＜0.01).CD15阳性的肿瘤Cath-D阳性率显著高于CD15阴性者(82%,31/38 vs 41%,11/27),CD15表达与Cath-D表达呈正相关(r=0.42,P＜0.01).结论检测CD15和Cath-D表达对判断食管癌恶性程度、预测其侵袭转移趋势和预后及指导治疗有重要意义.食管癌CD15与Cath-D表达具有相互协同作用可能.     

Transepithelial transport of putrescine across monolayers of the human intestinal epithelial cell line, Caco-2

AIM: To study the transepithelial transport characteristics of the polyamine putrescine in human intestinal Caco-2 cell monolayers to elucidate the mechanisms of the putrescine intestinal absorption. METHODS: The transepithelial transport and the cellular accumulation of putrescine was measured using Caco-2 cell monolayers grown on permeable filters. RESULTS: Transepithelial transport of putrescine in physiological concentrations (> 0.5 mM) from the apical to basolateral side was linear. Intracellular accumulation of putrescine was higher in confluent than in fully differentiated Caco-2 cells, but still negligible (less than 0.5%) of the overall transport across the monolayers in apical to basolateral direction.EGF enhanced putrescine accumulation in Caco-2 cells by four fold, as well as putrescine conversion to spermidine and spermine by enhancing the activity of S adenosylmethionine decarboxylase. However, EGF did not have any significant influence on putrescine flux across the Caco-2 cell monolayers. Excretion of putrescine from Caco-2 cells into the basolateral medium did not exceed 50 picomoles, while putrescine passive flux from the apical to the basolateral chamber, contributed hundreds of micromoles polyamines to the basolateral chamber. CONCLUSION :Transepithelial transport of putrescine across Caco2 cell monolayers occurs in passive diffusion, and is not influenced when epithelial cells are stimulated to proliferate by a potent mitogen such as EGF.     

Changes of lipid metabolism in plasma, liver and bile during cholesterol gallstone formation in rabbit model

AIM To find out the relationship between the disturbances of lipid metabolism and the formation of cholesterol gallstones by studying the changes of lipid metabolism in plasma, liver tissue and the bile.METHODS Male and female white Japanese rabbits were divided randomly into a control group (Con) and four experimental groups of 10 rabbits each fed with a diet containing 1.2% cholesterol for one, two, three and four weeks (1wk, 2wk, 3wk and 4wk group). The measurement of plasma triglyceride (TG), total cholesterol (TC), high density lipoprotein cholesterol (HDL-C) and its subfractions (HDL2-C, HDL3-C), very low and low density lipoprotein cholesterol (VLDL-C, LDL-C) was taken with standard enzymatic techniques. Apolipoprotein (apo) concentrations in plasma were measured by radial immunodiffusion assay for apoA1, apoB100, aopCⅡ and apoCⅢ. Total cholesterol of liver was measured by the enzymatic procedure for each animal. Bile acids, mainly glycocholate (GCA) and glycodeoxycholate (GDCA) were detected by dual wavelength thin layer scanner.RESULTS In all the experimental groups fed with dietary cholesterol, cholesterol crystal was found in the gallbladder in 2/10 cases of the 1wk group, 4/10 of the 2wk group, 6/10 of the 3wk group and 7/10 of the 4wk group respectively. The concentration of plasma total cholesterol (TC), triglyceride (TG), phospholipid (pl), VLDL-C, LDL-C, apoB100, apoCⅡ, apoCⅢ gradually increased (P＜0.05) with the prolonged feeding time of dietary cholesterol. High density lipoprotein cholesterol and its subfractions (HDL-C, HDL2-C, HDL3-C) showed a tendency to decrease, but without statistical significance (P＞ 0.05). ApoA1 was reduced with increased feeding time of dietary cholesterol (P ＜0.05). The hepatic and biliary cholesterol increased 1-1.5 times as compared with the control group (t=5.221 and 3.445, P＜0.05). The GCA gradually decreased beginning from the control group to the 4wk group (P＜0.05).CONCLUSION Owing to the high cholesterol diet, the increased concentrations of plasma TC, TG, VLDL-C, LDL-C, hepatic TC and TG, apoB100, apoCⅡ and apoCⅢ possibly enhanced the secretion of biliary cholesterol into bile; the decreased plasma apoA1 level might reduce the secretion of antinucleating factor into bile. All those factors mentioned above probably contribute to the formation of cholesterol gallstones.     

Effects of hypoxia, hyperoxia on the regulation of expression and activity of matrix metalloproteinase-2 in hepatic stellate cells

AIM To study the effects of hypoxia,hyperoxia on theregulation of expression and activity of matrixmetalloproteinase-2 (MMP-2) in hepatic stellate cells(HSC).METHODS The expressions of MMP-2,tissue inhibitor ofmatrix metalloproteinass-2 (TIMP-2) and membrane typematrix matalloproteinass-1 (MT1-MMP) in cultured rat HSCwere detected by immunocytochemistry (ICC) and in situhybridization (ISH).The contents of MMP-2 and TIMP-2 inculture supernatant were detected with ELISA and theactivity of MMP-2 in supernatant was revealed byzymography.RESULTS In the situation of hypoxia for 12h,theexpression of MMP-2 protein was enhanced (hypoxiagroup positive indexes:5.7±2.0,n=10;control:3.2±1.0,n=7;P<0.05),while TIMP-2 protein was decreasedin HSC (hypoxla group positive indexes:2.5±0.7,n=10;control:3.6±1.0,n=7;P<0.05),and the activity(total A) of MMP-2 in suparnatant declined obviously(hypoxla group:7.334±1.922,n=9;control:17.277±7.424,n=11;P<0.01).Compared the varied duration ofhypoxia,the changes of expressions Including mRNA andprotein level as well as activity of MMP-2 were mostnotable in 6 h group.The highest value (Ahypoxla~-Acontrol) ofthe protein and the most intense signal of mRNA were inthe period of hypoxia for 6 h,along with the lowestactivity of MMP-2.In the situation of hyparoxia for 12 h,the contents (A_(450)) of MMP-2 and TIMP-2 in supernatantwere both higher than those in the control,especially theTIMP-2 (hyperoxla group:0.0499±0.0144,n=16;control:0.0219±0.0098,n=14;P<0.01),and so wasthe activity of MMP-2 (hyperoxia group:5.252±0.771,n=14;control:4.304±1.083,n=12;P<0.05),and the expression of MT1-MMP was increased.CONCLUSION HSC is sensitive to the oxygen,hypoxiaenhances the expression of MMP-2 and the effect is moremarked at the early stage;hyperoxia mainly raises theactivity of MMP-2.