污染因子Cu2+对鲫鱼血细胞的影响

在光镜水平上研究了鲫鱼外周血细胞的形态结构。结果发现在鲫鱼外周血中可看到红细胞、淋巴细胞、嗜中性粒细胞、单核细胞和血栓细胞,未发现嗜酸性细胞和嗜碱性粒细胞,描述了上述各种血细胞在光镜下的形态和显微结构。污染后鱼体中淋巴细胞的显著增加,单核细胞增多,伴随着血栓细胞和嗜中性细胞的显著减少是鱼体短期(96h)接触Cu~(2+)后变化的一个指示。这个研究结果同时也被白细胞数量的变化特征所证实,即白细胞在通常的温度污染条件下增多,以抵抗可能由Cu~(2+)所引起的机体感染,从而来保护机体。     

Differential basal synthesis of Hsp70/Hsc70 contributes to interindividual variation in Hsp70/Hsc70 inducibility

The source of intraspecies variation in the expression of heat shock proteins (HSPs) remains unresolved but could shed light on differential stress tolerance and disease susceptibility. This study investigated the influence of variable basal HSP synthesis on differential inducibility of HSP synthesis. Basal and heat-induced synthesis of the major HSP families in peripheral blood monocytes from healthy donors (n=42) were analysed using biometabolic labelling and densitometry. Basal Hsp70/Hsc70 synthesis and percentage induction of Hsp70/Hsc70 synthesis were significantly correlated (r=−0.57, p<0.0001), and described most accurately by an exponential decay equation (R=0.68, R²=0.46). This regression equation suggests that increasing levels of basal Hsp70/Hsc70 synthesis are accompanied byan exponential decrease in the percentage induction of Hsp70/Hsc70 synthesis. The model fits data from European and non-European population groups independently, although both coefficients in the regression equation were larger for non-Europeans. This implies population group as an additional factor influencing differential HSP expression. The differential inducibility of Hsp70/Hsc70 due to variable basal synthesis of Hsp70/Hsc70 and based upon population group may contribute to differential stress tolerance or disease susceptibility. Received 27 March 2000; received after revision 19 June 2000; accepted 20 June 2000     

MCP-1在子痫前期患者胎盘组织及血清中的表达及意义

通过比较单核细胞趋化蛋白-1（MCP-1）在正常孕妇和子痫前期患者胎盘及血清中的表达,探讨MCP-1在子痫前期发病机制中的作用。选取30例正常晚孕妇女、30例轻度子痫前期患者和30例重度子痫前期患者进行研究。采用免疫组织化学S P法检测MCP-1在胎盘组织中的表达;采用酶联免疫吸附法（ELISA）检测血清MCP-1水平。结果：子痫前期患者胎盘组织和血清中MCP-1的表达均高于正常妊娠组,差异有统计学意义（P〈0.01）,且随着病情加重而递增;子痫前期患者胎盘组织MCP-1表达与血清MCP-1水平呈显著正相关（r=0.725,P〈0.01）。结果表明,MCP-1在子痫前期患者胎盘与血清中的表达均升高,提示MCP-1在子痫前期的发生、发展中可能起着重要的作用。     

Interferons and indoleamine 2,3-dioxygenase: Role in antimicrobial and antitumor effects

Summary Indoleamine 2,3-dioxygenase (IDO) is an interferon (IFN)-induced protein that initiates the metabolism of tryptophan along the kynurenine pathway. Although IDO can be induced by IFN- in many cell types, only mononuclear phagocytes have been shown to be induced to decyclize tryptophan by all three IFN classes. Since tryptophan is an essential amino acid necessary for a variety of metabolic processes, depletion of available tryptophan may be an important mechanism for control of rapidly-dividing microbial pathogens and tumors. The purpose of this review is to present evidence that documents the effects of IFN-induced IDO on prokaryotic and eukaryotic pathogens, as well as on a variety of tumor cell lines.     

SH-SY5Y与U87细胞共培养条件性培养基可降低N-甲基-salsolinol介导THP-1细胞的凋亡

 神经免疫在帕金森病(PD)的致病机理中发挥重要的作用,PD 患者的外周血淋巴细胞的数量发生了变化,提示外周免疫系统在PD 的发生发展中发挥一定的作用。但是外周单核细胞(PBMC)在其中发挥的具体作用尚不清楚。外源性神经毒素(MPTP)类似物,内源性神经毒素(NMSal)可能是导致PD 发生的一种因素。研究采用NMSal 损伤的SH-SY5Y与U87 细胞共培养的条件性培养基培养外周单核细胞THP-1,探讨NMSal 损伤的多巴胺能神经元细胞对外周单核细胞的影响。结果表明,该条件性培养基可以降低NMSal 毒性诱导的THP-1 细胞的凋亡、氧化应激水平(MDA 和H₂O₂)、线粒体的损伤和凋亡相关蛋白FADD、Bax 和caspase3 的表达和活化水平。PD 病人中损伤的多巴胺能神经元与星形胶质细胞的相互作用可能会影响PBMC,进而影响PD 病情的进展。     

胰腺癌CEA,CA199,IL-6和MCP-1在血清中的表达及临床意义

 探讨胰腺癌患者血清中CEA,CA199,IL-6和MCP-1的表达及临床意义。检测118例胰腺癌患者,107例慢性胰腺炎患者和113例健康人群血清中CEA,CA199,IL-6和MCP-1的含量,评价其单独检测和联合检测对于胰腺癌的诊断价值。与正常对照组相比较,慢性胰腺炎组的CA199和MCP-1有统计学差异,胰腺癌组的CEA,CA199,IL-6和MCP-1均显著升高。与慢性胰腺炎组相比较,胰腺癌组的CA199和IL-6均显著升高。当这4种指标单独区分慢性胰腺炎组和胰腺癌组时,诊断能力最好的指标CA199,其诊断灵敏性和特异性分别为72.30%和74.90%。细胞因子中IL-6的诊断灵敏性较高,为85.40%,而其特异性较低,为57.50%。 CA199和IL-6联合诊断慢性胰腺炎和胰腺癌时,其诊断价值高于任一单独指标检测,其灵敏性和特异性分别为87.30%和90.30%。单独检测灵敏性和特异性诊断价值有限,而联合检测可有效提高其诊断水平,具有一定的辅助诊断价值。     

维生素B6在家兔实验性动脉粥样硬化保护作用中免疫因素的影响

目的：了解大剂量维生素Ｂ６在实验性动脉粥样硬化的保护作用与免疫因素的关联。方法：测定实验性高胆固醇家兔血清抗单核细胞抗体,以及白细胞移动抑制试验。结果：１）维生素Ｂ６有明显降低血胆固醇,减少动脉壁粥样斑块形成的作用;２）较长期喂胆固醇饲料,导致家兔细胞免疫反应下降,补充维生素Ｂ６可使细胞免疫反应维持原有水平;３）在无外来抗原诱导,较长期喂养高胆固醇饲料,可使家兔产生抗单核细胞抗体。结论：补充大剂量维生素Ｂ６可降低血胆固醇及减少动脉壁粥样斑块的形成,并能改善家兔细胞免疫状态,但未发现影响机体体液免疫。     

Differential chemotactic potential of mouse platelet basic protein for thymocyte subsets

Mouse platelet basic protein (CXCL7/mPBP) was cloned from thymic stromal cells and further identification indicated that it was expressed in thymic monocytes/macrophages (Mo/Ms). Recombinant mPBP was chemoattractive for target cells of polymorphonuclear leucocytes, peritoneal Mo/Ms and splenic lymphocytes with distinct potencies. CXCR2 was identified to be a cognate receptor for mPBP. Mouse thymocyte subsets of CD4^-CD8^- double-negative (DN), CD4⁺CD8⁺ double-positive (DP), CD4⁺CD8^- single-positive (CD4SP) and CD4^-CD8⁺ single-positive (CD8SP) expressed cell surface CXCR2 with different positive percentages and expression levels. mPBP was chemoattractive for thymocyte subsets with the potency order DN>DP> CD8SP>CD4SP, consistent with the levels of CXCR2 expressed on the respective cells. Thus, mPBP in thymus is functionally redundant with chemokine CXCL12/ SDF-1. Moreover, our finding that thymic Mo/Ms can produce mPBP implies that they may have other functions apart from acting as scavengers in thymus.Received 25 March 2004; received after revision 10 May 2004; accepted 8 June 2004