转化生长因子β1、表皮生长因子受体表达与非小细胞肺癌淋巴结转移及预后的关系

目的：探讨转化生长因子β１（ＴＧＦβ１）、表皮生长因子受体（ＥＧＦＲ）在非小细胞肺癌中的表达及意义。方法：应用免疫组化法检测了１２１例非小细胞肺癌标本中ＴＧＦβ１、ＥＧＦＲ的表达。结果：ＴＧＦβ１在肺癌中的阳性表达分为间质型和胞浆型,总阳性表达率为７７．７％。ＴＧＦβ１的阳性表达类型与肺癌的淋巴结转移及预后有关,淋巴结转移阳性组ＴＧＦβ１的单一间质阳性表达率显著低于淋巴结阴性组,而单一胞浆阳性表达率高于淋巴结阴性组;半年内死亡组的ＴＧＦβ１单一间质阳性表达率低于５年以上生存组,而间质胞浆均阳性的表达率及单一胞浆阳性表达率则高于５年以上生存组（Ｐ均＜０．０５）。ＥＧＦＲ阳性表达率为４３．８％,其表达与淋巴结转移无关;与患者预后关系明显,ＥＧＦＲ阳性表达者预后差（Ｐ＜０．０５）。结论：ＴＧＦβ１、ＥＧＦＲ表达与肺癌恶性生物学行为关系明显,是评估患者预后的有效参数     

人工软骨材料——聚乙烯醇水凝胶的研制

聚乙烯醇溶液于－２０℃左右的温度下冷冻６－１２ｈ,室温下颌化１－２ｈ,上述过程反复进行１－３次,然后对试样进行真空脱水处理,制得一种人工软骨材料－ＰＶＡ水凝胶。     

萎缩小肠粘膜上皮细胞凋亡及其相关基因表达的研究

目的：探讨细胞凋亡与小肠粘膜萎缩发生之间的关系。材料和方法,采用原位末端标记,免疫组化和ＲＴ－ＰＣＲ的方法,对正常小肠粘膜上皮和萎缩小肠粘膜上皮细胞凋亡的发生及其相关基因的表达进行对比研究。结果萎缩小肠粘膜上皮细胞凋亡的发生率明显高于正常小肠（Ｐ〈０．０５）;Ｃ－ＭＹＣ在萎缩小肠绒毛顶部异常高表达,ＢＡＸ和ＢＣＬ－２呈弥散分布,ＢＣＬ－２在萎榨小肠粘膜上皮的表达显著低于正常小肠（Ｐ〈０．０５）,Ｂ     

超高分子聚乙烯经离子注入后生物相容性研究

目的;研究经离子注入后的高分子聚乙烯的生物相容性。方法;按照美国材料协会ＡＳＴＭ标准,进行了全身急性毒性试验;热原试验,细胞毒性试验,微核试验和肌肉长期植入试验。结果：经离子注入的超高分子聚乙烯样品符合各项试验标准,并与对照样品在试验过程中出现的情况一致。结论：经离子注入的超高分子聚乙烯样品与末经离子注入的已在临床上使用的超高分子聚乙烯具有相同的生物相容性,为临床上作为人工材料应用提供了试验依据。     

老年性记忆减退大鼠内侧隔核-斜角带神经生长因子受体阳性神经元的改变

为探讨神经生长因子受体在老年性记忆减退大鼠记忆相关区域表达的改变,选用雄性ＳＤ 大鼠（青年组２０ 只,老年组４０ 只）进行Ｍｏｒｒｉｓ水迷宫行为学测定,老年组又分为老年记忆减退组（简称老年减退组）和老年记忆正常组（简称老年正常组）。分析内侧隔核－斜角带中神经生长因子受体表达的改变。老年减退鼠内侧隔核、斜角带垂直支和斜角带水平支三个核团神经生长因子受体阳性神经元的数量较老年正常组分别下降了３７．８９％ 、３９．７５％ 和３８．８６％ （Ｐ＜ ０．０１）。受试大鼠逃避潜伏期与内侧隔核－斜角带的神经生长因子受体阳性神经元数量呈负相关（内侧隔核ｒ＝ －０．８２３８,Ｐ＜ ０．０１;斜角带垂直支ｒ＝ －０．９０７６,Ｐ＜ ０．０１;斜角带水平支ｒ＝ －０．８１３８,Ｐ＜ ０．０１）。老年减退组神经生长因子受体阳性神经元灰度值较老年正常组三个核团分别下降３０．９１％ 、２９．６７％ 和３６．７１％ （Ｐ＜ ０．０１）,胞体面积较老年正常组减少２９．０５％ 、１７．５２％ 和３７．８７％ （Ｐ＜ ０．０１）。老年减退组神经生长因子受体的丢失可能是引起老年性记忆减退的机制之一。     

一种小鼠肿瘤相关膜蛋白单抗对DCS细胞生物学行为的影响

探讨一种小鼠肿瘤相关膜蛋白在ＤＣＳ细胞表达的意义。方法用该蛋白抗处理ＤＣＳ细胞,观察其对细胞生长速度,软琼脂克隆形成能力,粘附性,细胞运动能力,水解酶活性,侵袭性,体内转移率等生物学行为方面的影响。结论该细胞膜蛋白可能调控小鼠肿瘤细胞增殖能力。     

The effect of a levonorgestrel-releasing intrauterine device on human endometrial oestrogen and progesterone receptors after one year of use

Thirty-four women bearing a levonorgestrel-releasing intrauterine device, 20 micrograms/day (LNG-IUD-20), for 12-15 months were recruited. Endometrial biopsies were collected during the late proliferative phase of the cycle (on cycle days 10-12) before (control) and after the use of the IUD for 12 months, and assayed for oestrogen receptors (ER) and progesterone receptors (PR). An immunohistochemical technique with the peroxidase-antiperoxidase detection system (PAP method) was employed. D75 and JZB39 were the primary antibodies for ER and PR respectively. The immunostaining semiquantitative analysis was performed with a computerized microscope image processor, and expressed as 'grey value'. Both endometrial ER and PR populations were significantly lower after insertion of the IUD (P < 0.01) than in control biopsies. The intensity of nuclear staining and the percentage of positively stained cells for ER and PR in women with LNG-IUD were each about 50% of those in control biopsies. The results suggested that LNG released locally from the IUD has a depressive action on the ER and PR, which may contribute to the contraceptive effectiveness of this type of IUD and also to the possible causes of LNG-IUD-induced irregular bleeding and amenorrhoea.     

Frequency of the fragile X syndrome in Chinese mentally retarded populations is similar to that in Caucasians.

Fragile X syndrome is recognized as the most common inherited cause of mental retardation in western countries. The prevalence of the fragile X syndrome in Asian populations is uncertain. We report a multi-institutional collaborative study of molecular screening for the fragile X syndrome from 1,127 Chinese mentally retarded (MR) individuals. We found that 2.8% of the Chinese MR population screened by DNA analysis had the fragile X full mutation. Our screening indicated that the fragile X syndrome prevalence was very close to that of Caucasian subjects. In addition, we found that 62.5% of fragile X chromosomes had a single haplotype for DXS548-FRAXAC1 (21-18 repeats) which was present in only 9.7% of controls. This unique distribution of microsatellite markers flanking the FMR1 CGG repeats suggests that the fragile X syndrome in Chinese populations, as in the Caucasian, may also be derived from founder chromosomes.     

Reconstructed human cornea produced in vitro by tissue engineering.

The aim of the present study was to produce a reconstructed human cornea in vitro by tissue engineering and to characterize the expression of integrins and basement membrane proteins in this reconstructed cornea. Epithelial cells and fibroblasts were isolated from human corneas (limbus or centre) and cultured on plastic substrates in vitro. Reconstructed human corneas were obtained by culturing epithelial cells on collagen gels containing fibroblasts. Histological (Masson's trichrome staining) and immunohistological (laminin, type VII collagen, fibronectin as well as beta1, alpha3, alpha4, alpha5, and alpha6 integrin subunits) studies were performed. Human corneal epithelial cells from the limbus yielded colonies of small fast-growing cells when cultured on plastic substrates. They could be subcultured for several passages in contrast to central corneal cells. In reconstructed cornea, the epithelium had 4-5 cell layers by the third day of culture; basal cells were cuboidal. The basement membrane components were already detected after 3 days of culture. Integrin stainings, except for the alpha4 integrin, were also positive after 3 days. They were mostly detected at the epithelium-stroma junction. Such in vitro tissue-engineered human cornea, which shows appropriate histology and expression of basement membrane components and integrins, provides tools for further physiological, toxicological and pharmacological studies as well as being an attractive model for gene expression studies.     

Preparation of three functional monoclonal antibodies against human FL molecule and analysis of their bioactivity]

AIM: To Prepare three functional monoclonal antibodies(mAbs) against human FL molecule and analyze their bioactivity. METHODS: The cell line L929-FL transfected with human FL gene was used as immunogen. The hybridomas secreting the antibodies against human FL were obtained by fusing splenoecytes from the immunized mice with murine myeloma cells(Sp2/0). Their subclasses were analyzed using fast-strip method. The monoclonal antibodies were produced in mouse peritoneal cavity and purified by Protein G affinity chromatography. The inhibitory effect of mAbs against FL on leukemia cell lines U937 and HL-60 was detected by MTT. The apoptosis of U937 and HL-60 cells stained by annexin-V/PI was determined by FCM. RESULTS: Three hybridomas named 3C2, 3C6 and 8D10 were successfully obtained, which secreted monoclonal antibodies against human FL molecule stably. Their subclasses were the mouse IgG2a with kappa light chains. The three monoclonal antibodies recognized the FL molecule on U937 and HL-60 cells that also coexpressed Flt3 molecule. When U937 and HL-60 cells were cultured in presence of 3C2, 3C6 and 8D10, their proliferation was reduced as compared to that in control in MTT assay(P < 0.05). The analysis of annexin-V/PI binding to U937 and HL-60 cells by FCM showed the mAbs had the apoptotogenic activity of the monoclonal antibodies against human FL molecule. CONCLUSION: 3C2, 3C6 and 8D10 are three funtional monoclonal antibodies against human FL molecule. They may be of some value in the study of the roles of FL/Flt3 interaction in leukemia pathogenesis.