Experimental Study on Allogenic Decalcified Bone Matrix as Carrier for Bone Tissue Engineering

The biocompatibility and osteogenic activity of allogenic decalcified bone matrix (DBM) used as a carrier for bone tissue engineering were studied. Following the method described by Urist, allogenic DBM was made. In vitro, DBM and bone marrow stromal cell (BMSC) from rab-bits were co-cultured for 3-7 days and subjected to HE staining, and a series of histomorphological observations were performed under phase-contrast microscopy and scanning electron microscopy (SEM). In vivo the mixture of DBM/BMSC co-cultured for 3 days was planted into one side of muscules sacrospinalis of rabbits, and the DBM without BMSC was planted into other side as con-trol. Specimens were collected at postoperative week 1, 2 and 4, and subjected to HE staining, and observed under SEM. The results showed during culture in vitro, the BMSCs adherent to the wall of DBM grew, proliferated and had secretive activity. The in vivo experiment revealed that BMSCs and undifferentiated mesenchymal cells in the perivascular region invaded gradually and proliferated together in DBM/BMSC group, and colony-forming units of chondrocytes were found. Osteoblasts,trabecular bone and medullary cavity appeared. The inflammatory reaction around muscles almost disappeared at the second weeks. In pure DBM group, the similar changes appeared from the sur-face of the DBM to center, and the volume of total regenerate bones was less than the DBM/BMSC group at the same time. The results indicated that the mixture of DBM and BMSC had good bio-compatibility and ectopic induced osteogentic activty.     

20例植入性胎盘临床病理分析

植入性胎盘为罕见病例,1969～1984年我院收治本病20例,同期分娩总数为4955°。中期妊娠发病2例,多数发生在妊娠37—42周。临床表现为第三产程胎盘滞留,手取胎盘失败,产后出血、休克。17例病人做了子宫切除术,3例胎盘大部分取出,保留子宫。预后良好,均痊愈出院。     

碘杂环化合物对离体豚鼠心乳头肌动作电位和收缩力的作用

采用细胞内微电极记录技术,同步观察了3,6-[二甲氨基]-二苯并碘因甲酸盐(IHC-64)对豚鼠心乳头肌细胞动作电位和收缩力的作用。50μmol/L IHC-64抑制心肌收缩力,而不影响快反应动作电位。增加IHC-64浓度,动作电位0相最大峰值(APA)、除极速率(dp/dt_(max))和复极50％和90％时程(APD_(50)、APD_(90))被明显抑制。IHC-64抑制慢反应动作电位,提高细胞外钙浓度可拮抗这种抑制。结果提示,IHC-64主要抑制慢Ca~(2+)内流,同时也部分抑制快Na~+内流,它可能是一种新型B类钙通道阻滞剂。     

Differential antagonism of the behavioral depressant and hypothermic effects of 5'-(N-ethylcarboxamide) adenosine by theobromine

The methylxanthine, theobromine (3,7-dimethylxanthine), was tested in mice, to determine whether theobromine could function in vivo as an adenosine receptor antagonist, in keeping with its reported in vitro effects as a blocker of agonist binding to the adenosine A-1 receptor. Theobromine doses, which themselves had no direct effects on spontaneous locomotor activity, completely blocked N6-cyclohexyladenosine-induced suppression of locomotor activity but were without effect on 5'-N-ethylcarboxamide adenosine (NECA)-induced decreases in motor activity. In contrast to the specific antagonism, theobromine blocked the hypothermia induced by both of these adenosine analogs. These results demonstrate that theobromine is an active in vivo adenosine receptor antagonist and that the antagonism of N6-cyclohexyladenosine sensitive systems occurs even though theobromine does not stimulate spontaneous locomotor activity. Thus, the behavioral stimulant effects of methylxanthines may be more related to effects on NECA-sensitive systems, which are not blocked by theobromine. The use of in vivo differences in the effects xanthine may provide a useful tool in the development of compounds to probe the mechanisms of caffeine induced CNS effects.     

潘生丁增强氨甲蝶呤的抗肿瘤作用

外源性核苷能抵消抗代谢药对肿瘤细胞的杀伤作用;核苷转运抑制剂潘生丁则能阻断核苷的这种抵消作用,从而增强抗代谢药的细胞毒性。本研究证明,胸苷和次黄嘌呤可明显抵消氨甲蝶呤对L1210细胞的杀伤作用,潘生丁则能有效地阻断核苷的抵消作用;潘生丁和两性霉素B合用可明显增强氨甲蝶呤对小鼠S180肉瘤的抑制作用,但不增强氨甲蝶呤对动物的毒性。提示潘生丁有可能应用于肿瘤联合化疗。     

多西他赛联合照射对人胃癌裸鼠移植瘤生物效应的实验研究

目的:观察多西他赛对人胃癌裸鼠移植瘤的放射增敏作用和多西他赛联合放射对肿瘤细胞凋亡的影响。方法:建立人AGS胃癌裸鼠移植瘤动物模型28只,随机分为4组:对照组、单纯照射组、单纯多西他赛组、多西他赛 照射组。测量各组移植瘤体积,计算各组抑瘤率,评价多西他赛的放射增敏效果,并对标本进行光镜观察及原位末段标记(TUNEL)检测。结果:28只裸鼠的成瘤率为100%,实验期间无死亡,比较各组移植瘤体积差异有统计学意义(P<0.01)。各组抑瘤率分别为单纯照射组36.4%,单纯多西他赛组44.2%,多西他赛 照射组86.9%。多西他赛对放射治疗的增敏值(enhancement factor,EF)值为1.5。多西他赛 照射组的平均凋亡指数(AI)为(15.6±2.3)%,与其它各组比较差异有统计学意义(P<0.01)。结论:多西他赛对人AGS胃癌裸鼠移植瘤有良好的放射增敏作用,多西他赛联合放疗能更有效地诱导肿瘤细胞凋亡。     

尿流改道及膀胱重建术的现状与展望

膀胱全切术后尿液的贮存与排出一直是未能满意解决的问题。自从1852年Simon报道输尿管乙状结肠吻合以来，经过一个多世纪的不断改进与创新，特别是1982年Kock用去管重建法制作贮尿囊的可控膀胱以来，尿流改道与膀胱重建术有了跨时代的进步和发展，显地提高了患术后生活质量。     

The correlation between TNF-α, IL-6 in cervical mucous during follicular development and ovulation stimulation in different protocols

Objective To investigate the correlation between TNF-α and IL-6 levels in cervical mucous during follicular development and ovulation stimulation in different protocols.Methods 36 infertile women were set up as experimental groups,divided into CC, HMG, IVF-ET group,each group consisted of 12 infertile women and 15 women with normal menstrual cycles were choiced as control group.Cervical mucous during follicular phase, luteal phase and ovulation phase were collected.TNF-α, IL-6 levels in cervical mucous were measured by radioimmunology assay (RIA).Follicular development were monitored by transvaginal ultrasonagraphy.Results (1) TNF-α levels in cervical mucous of experimental groups and control group were periodically various among the reproductive cycle.It increased during follicular phase, reached to peak during ovulation phase, and decreased during luteal phase (P＜0.05).IL-6 levels had no obvious periodical changes.(2) Compared with CC and control group, levels of TNF-α,IL-6 in HMG and IVF-ET group were significantly higher (P＜0.05).(3) Levels of TNF-α and IL-6 in cervical mucous were positively correlated with the dominant follicle diameter (r=0.261, r=0.192 respectively,P＜0.05).(4) TNF-α and IL-6 showed positive correlation in the reproductive cycle (r=0.782,P＜0.05).Conclusions (1) TNF-α level shows a cyclic change in the reproductive cycle and peaks during ovulation,whereas IL-6 level does not.(2) TNF-α and IL-6 may play a certain role in the process of follicular development and ovulation.(3)The levels of TNF-α and IL-6 are up-regulated by gonadotrophic hormone.(4) TNF-α and IL-6 may have coordination properties and participate in the same biological effects.     

大白鼠皮肤Ⅱ度、Ⅲ度碱烧伤模型复制

目的 根据大白鼠皮肤碱烧伤创面早期病理组织学观察复制Ⅱ、Ⅲ度碱烧伤模型,研究碱烧伤的临床治疗.方法 Wistar纯种健康大白鼠20只,以不同浓度2mol/l、2.5mol/l、5mol/lNaOH,作用时间分别为30秒、45秒、60秒、75秒,涂抹于脱毛后的表皮.结果 2mol/L(60s)、2.5mol/L(45s),5mol/L(30s)即可直接造成Ⅱ度～深Ⅱ度烧伤;2mol/L(75s)、2.5mol/L(60s)、5 mol/L(45s)即可造成Ⅲ度烧伤,其烧伤深度与NaOH溶液浓度和作用时间呈正比.结论 Ⅱ度、Ⅲ度碱烧伤均为渐进性烧伤,与文献中介绍的潜拙样损伤似乎不同.另外,不同浓度NaOH溶液在相同时间对皮肤组织的损伤及同一浓度NaOH溶液在不同时间对大白鼠皮肤的损伤病理学变化均有差异.