Immunoglobulin heavy chain Diversity genes rearrangement pattern indicates that MALT-type gastric lymphoma B cells have undergone an antigen selection process

Gastric MALT lymphoma usually develops from chronic gastritis, the vast majority of which (>90%) is associated with Helicobacter pylori infection. We sequenced the third complementarity determining region (CDR3) of immunoglobulin heavy chain genes in 19 gastric MALT lymphoma clones to determine the pattern of variable (V), diversity (D) and joining (J) gene utilization during immunoglobulin gene rearrangement.
DNA was extracted from paraffin-embedded sections and the rearranged CDR3 regions were amplified using a semi-nested polymerase chain reaction (with primers complementary to the conserved framework-three segment of the variable region [FR3A] and J regions). The DNA used for cloning and sequencing was obtained after purification of monoclonal bands excised from polyacrylamide gels. The N-D-N region specific to each clone was compared with known germline D sequences.
Similarly to that observed in normal and leukaemic B cells, our series of gastric MALT lymphomas showed apparent preferential utilization of genes from the DXP family. In two cases no similarity between the CDR3 nucleotide sequences of the neoplastic clones and the known germline D sequences could be found. In 10/19 analysed alleles the lymphoma B-cell clones appeared to contain two D gene segments (D-D recombination), a rare occurrence in normal individuals but one which has been described as a significant event in the determination of idiotype expression and antigen-binding affinity. Remarkably, despite the use of different D and J segments, the resultant amino acid sequences matched in two patients, suggesting the presence of a common selecting antigen.
The observed pattern of D gene rearrangement suggests that MALT lymphoma B-cell clones have undergone antigen selection, which seems to indicate that the antigen stimulation plays a pivotal role in the development of the lymphoma.     

金属换热器传热过程的数学模型及应用

应用蒙特卡洛法仿真辐射式金属换热器内的辐射传热过程，建立了换热器综合传热的数学模型，利用概率论原理，把辐射能迁移过程仿真为一定累积概率分面下的随机过程，该模型能较好地反映换热器内传热过程的真实情况，可以计算出换热器内烟气、筒壁、空气的温度和壁面热流分布，以及研究烟气进口温度、换热器筒径和狭逢宽度对换热效果的影响。     

The pathology of cardiac ischaemia: Cellular and molecular aspects

This study evaluates the morphological and phenotypic changes that occur in squamous cell carcinoma of the head and neck when local infusions of interleukin-2 (IL-2) are given. Twelve patients were treated with a range of doses of IL-2 (3 × 10³ to 3 × 10⁶ international units/day) by continuous intra-arterial infusion for 10 days. Biopsies of the tumour were taken pre- and 48 h post-therapy, snap-frozen, cut, and examined histologically and immunocytochemically. Local infusions of IL-2 increase the numbers of antigen-presenting Langerhans cells (CDIa-positive) and infiltrating lymphocytes, predominantly of the CD3 and CD4 (T-helper) phenotypes. Locally infused IL-2 results in the expression of MHC (major histocompatibility complex) class II antigens on the surface of the tumour cells, capillary and post-capillary endothelial cells, and peri-tumoural macrophages. Intratumoural NK (natural killer) cells and CD8-positive (T-cytotoxic) infiltrating lymphocytes were not increased by this therapy and CD25 (IL-2 receptor) was only increased in those patients treated at the lower does levels. The system of intra-arterial cytokine infusion into head and neck tumours developed in this study is a useful model to examine the biological effects of cytokines, since in vivo they are mainly produced and act locally, Furthermore, the infused tumours are easily accessible to biopsy. The results from studies such as this may influence the design of tumour-targeted cytokine gene therapy programmes.     

P53、P16、Bcl-2基因及产物在原发性肺癌中的表达及其临床病理意义

目的 :探讨原发性肺癌 Mtp5 3、p16、Bcl- 2的异常表达与肺癌发生、发展的关系 ,以及它们之间的调控关系。 方法 :用免疫组化技术检测 (L SAB) 114例原发性肺癌组织中 p5 3、p16、Bcl- 2的表达。并用 PCR技术对 6 2例 p16蛋白丢失的肺癌组织中 p16外显子 2 (p16 E2 )的缺失进行分析。 结果:p5 3蛋白异常表达与肺癌组织学类型、分化程度无关 (P >0 .0 5 ) ,但与淋巴结转移情况有关 (P >0 .0 5 )。 p16蛋白阳性表达率与肺癌的组织学类型无关 ,但是其表达水平与非小细胞肺癌 (NSCL C)的细胞分化程度和淋巴结转移密切相关 (P <0 .0 5 )。 NSCL C中 p16E2的缺失率为 45 .2 %,其缺失水平随淋巴结转移和组织学分级的升高而升高 (P <0 .0 5 )。 SCL C(小细胞肺癌 )和正常肺组织中无 p16 E2的缺失。 Bcl- 2在小细胞肺癌中阳性率 6 2 .2 %显著高于 Sq Ca(鳞癌 )的 2 5 %和 Ad Ca(腺癌 )的 9.1%(P <0 .0 5 ) ,与细胞分化程度和淋巴结转移情况无关。另外 ,p5 3与 p16蛋白之间存在调控关系。 结论 :(1) p16、p5 3、Bcl- 2的异常参与肺癌的发生、发展过程。 (2 ) p16基因及产物的异常表达与 NSCL C的组织学分级和淋巴结转移相关 ,可能参与 NSCL C的发生、发展和转移过程。 (3) Bcl- 2反映 SCL C的分之生物学行为和临床     

逆转录病毒载体介导的外源性主要组织相容性抗原复合体基因转移及其在T细胞的表达

目的 建立一个在胸腺内表达外源性主要组织相容性抗原复合体(MHC)抗原的实验模型,为下一步研究作准备。方法 应用逆转录病毒载体介导的基因转移技术,首次将外源性MHC基因转移到T淋巴表达并应用聚合酶链反应(PCR)及反转录聚合酶链反应(RT-PCR)检测转染T细胞DNA及mRNA。结果 外源性MHC基因已整合到靶细胞染色体DNA并有效地转录;单克隆抗体免疫荧光染色流式细胞仪检测显示在转染T细胞膜有外源性MHC分子表达;转染效率为46.2％。结论 外源性MHC基因可以转移到T细胞稳定表达,为今后的研究提供了经验。     

转人GM—CSF基因人膀胱癌细胞株的建立及体外生物学特性

经逆转录病毒载体将人GM-CSF基因导入人膀胱癌细胞株BIU-87细胞中,建立了转基因细胞株BIU/GM。经流式细胞仪行细胞DNA周期分析表明GM-CSF基因的导人及表达对BIU-87细胞的增长无影响。免疫荧光测定发现转GM-CSF基因及表达不能促进BIU-87细胞表面HLA-ABC、DR、DQ抗原的表达。转基因瘤细胞株经6000rad X射线照射灭活后,丧失增殖能力,逐步死亡,但能维持一定水平的GM-CSF分泌活性达两周以上。从而为制备灭活的转基因瘤苗提供了初步经验。     

Absent chondrodysplasia punctata in a male with an Xp terminal deletion involving the putative region for CDPX1 locus

This is a follow-up report on a male patient with a 46, Y, r(X) karyotype. Although he had no clinico-radiological features of X-linked recessive chondrodysplasia punctata (CDPX1), molecular studies revealed an Xp terminal deletion involving the putative region for the CDPX1 locus (PABX-DXS31). We suspect that the absence of CDPX1 may be attributable to the nature of the disease and the extreme short stature of the patient (mean – 5.6 S.D.). © 1993 Wiley-Liss, Inc.     

人卵巢癌中肿瘤转移抑制基因nm23-H1编码蛋白的表达

目的：探讨人卵巢癌标本中，肿瘤转移抑制基因ｎｍ２３－Ｈ１编码蛋白ＮＤＰＫ－Ａ表达的临床意义及其与预后的关系。方法：应用免疫组织化学抗生蛋白链菌素－过氧化酶结合（Ｓ－Ｐ）法，检测５８例人卵巢癌标本中ｎｍ２３－Ｈ１蛋白水平。结果：ｎｍ２３－Ｈ１蛋白的表达与患者手术时是否有淋巴结及大网膜转移相关（Ｐ〈０．０５），但原发灶与转移灶间的阳性表达率相差不显著；与患者术后生存时间密切相关（Ｐ〈０．０１），术后生