蝎蜂毒肽对大鼠纤溶系统作用初探

本研究采用大鼠肢体血管灌流和整体给药两种模型，观察蝎蜂毒（ＳＢＰ）对血管理灌流液内纤溶酶原激活物（ＰＡ）活性、血浆优球蛋白纤溶性（ＥＦＡ）和纤溶酶（ＰＬ）活性的影响。结果说明，ＳＢＰ有明显激活纤溶系统作用；其机制可能涉及血管内皮细胞释放ＰＡ活性增加，进一步促使纤溶酶原活化为ＰＬ增多的途径。     

大鼠下丘脑及邻近区域催产素免疫阳性神经元与垂体后叶的关系

本文运用免疫细胞化学PAP及ABC法,显示大白鼠下丘脑内OXT免疫阳性神经元,并于垂体后叶注射WGA-HRP,显示下丘脑中逆行标记细胞,结合免疫细胞化学方法,观察下丘脑及其邻近区域内HRP与OXT双标记细胞,证实下丘脑视上核、室旁核、穹窿前核和后核、血管周细胞群、下丘脑视前区、下丘脑前区及外侧区、背侧副细胞群内、室周部、第三脑室侧壁室管膜细胞下及室间孔部室管膜细胞下,均有OXT免疫阳性神经元,其中至少部分神经元可发出向垂体后叶的投射纤维。位于第三脑室侧壁室管膜下及室间孔部室管膜下的神经元,可能监测脑脊液中各种因素的变化,调节垂体后叶OXT的分泌,也可能直接通过共树突向脑脊液内释放OXT。     

APAAP免疫印迹技术对抗副流感病毒1，3型单克隆抗体识别抗原表位的研究

副流感病毒１，３型（ＰａｒａｉｎｆｌｕｅｎｚａＶｉｒｕｓｔｙｐｅ１，３：ＰＩＶ＿１．３）单克隆抗体（ＭｃＡｂ）应用免疫印迹技术（Ｗｅｓｔｅｒｎｂｌｏｔｔｉｎｇ）识别抗原表位特性。结果表明：ＰＩＶ＿１．３抗原经还原剂处理后，ＳＤＳ－ＰＡＧＥ５％～１５％梯度胶电泳，能分辨二十多条清晰的蛋白带。转印后采用碱性磷酸酶抗碱性磷酸酶复合物（ＡＰＡＡＰ）染色，本底浅，呈玫瑰红色带，优于ＨＲＰ染色结果。ＰＩＶ＿１的５株ＭｃＡｂ：ＩＣ＿５、ＩＨ＿６、ＩＨ＿２、ＩＣ＿１０、３Ｄ＿５分别与６８ｋＤ～５０ｋＤ、６８ｋＤ、５８ｋＤ～２７ｋＤ、５５ｋＤ～５０ｋＤ、５０ｋＤ对应ＰＩＶ＿１的蛋白质抗原表位起反应。ＰＩＶ＿３的６株ＭｃＡｂ：２Ａ＿１０、５Ｇ＿３、２Ｄ＿１１、２Ｅ＿１０、２Ｂ＿１２、４Ｆ＿１２与７０ｋＤ、６８ｋＤ、６０ｋＤ～５０ｋＤ、５５ｋｐ～４０ｋＤ、５５ｋＤ、４０ｋＤ对应的蛋白质抗原表位特异结合，说明ＰＩＶ＿１．３的１１株ＭｃＡｂ同对应抗原表位点的结合分布较广，有利于对ＰＩＶ＿１．３抗原的快速、敏感、特异检测。     

Age-dependent and iron-independent expression of two mRNA isoforms of divalent metal transporter 1 in rat brain

The DMT1(Nramp2/DCT1) is a newly discovered proton-coupled metal-ion transport protein. The cellular localization and functional characterization of DMT1 suggest that it might play a role in physiological iron transport in the brain. In the study, we evaluated effects of dietary iron and age on iron content and DMT1 expression in four brain regions: cortex, hippocampus, striatum, substantia nigra. Total iron content in all regions was significantly lower in the low-iron diet rats and higher in the high-iron diet rats than that in the control animals, showing that dietary iron treatment for 6-weeks can alter brain iron levels. Contrary to our expectation, there was no significant alternation in DMT1(+IRE) and (-IRE) mRNA expression and protein content in all brain regions examined in spite of the existence of the altered iron levels in these regions after 6-weeks' diet treatment although TfR mRNA expression and protein level were affected significantly, as was expected. The data demonstrates that expression of DMT1(+IRE) and (-IRE) was not regulated by iron in these regions of adult rats. The lack of response of DMT1 to iron status in the brain suggests that the IRE of brain DMT1 mRNA might be not really iron-responsive and that DMT1-mediated iron transport might be not the rate-limiting step in brain iron uptake in adult rats. Our findings also showed that development can significantly affect brain iron and DMT1(+IRE) and (-IRE) expression but the effect varies in different brain regions, indicating a regionally specific regulation in the brain.     

The affinity of anti-HBc antibodies in acute and chronic hepatitis B infection.

Antibodies to hepatitis B core antigen (anti-HBc) are found in the sera of all individuals infected with hepatitis B virus. A role for these antibodies has been suggested in determining the outcome of infection. In this study, the affinity of anti-HBc antibodies in asymptomatic virus carriers was compared with that of antibodies present in the sera of patients with chronic liver disease. Persistently infected individuals with no evidence of clinical disease were found to have anti-HBc antibodies of greater affinity, compared with the chronic liver disease group. Sera from patients with chronic hepatitis contained high levels of low-affinity antibody whereas antibody levels in asymptomatic carriers were significantly lower. These findings are discussed in relation to the predicted role of anti-HBc antibodies in mediating hepatitis B virus-related hepatocellular injury.     

实验性肺水肿大鼠血浆中内皮素、一氧化氮含量的变化以及硝普钠、川芎嗪对其的影响

在肾上腺素所致大鼠肺水肿实验中，发现其血浆中内皮素（ET－1）明显升高，一氧化氮（NO）稍有增高，但ET－1的增幅远远大于NO的增幅，动物均在15min内死亡。ET的增高与儿茶酚胺的升高有密切关系。经硝普纳（NP）、川芎嗪（TMP）预防后，ET－1与NO基本恢复正常，趋于平衡，动物长期存活。提示：肺水肿时NO相对于ET－1明显降低，NP、TMP可对NO与ET的平衡起调节作用。     

Polyarteritis Nodosa with Atrophy of the Left Hepatic Lobe

A 73-year-old Japanese man with a history of partial gastrectomy due to gastric cancer 4 years previously was admitted because of intermittent fever. The patient developed abdominal pain, erythema, and myalgia in addition to the fever during the final clinical course, and died of acute heart failure. Autopsy disclosed atrophy of the left lobe of the liver and acute myocardial infarction. Neither metastasis nor recurrence of the cancer was observed. Small and medium-sized arteries of the visceral organs showed various stages of necrotizing vasculitis with narrowing of the lumina. The vasculitis was most prominent in the left lobe of the liver and in the heart. Narrowing of the portal vein due to portal tract inflammation in addition to vasculitis of the hepatic arteries may have induced ischemia and infarction, which had resulted in atrophy of the left hepatic lobe. Acta Pathol Jpn 42: 662–666, 1992.     

在动态模拟体液中致密CaP陶瓷表面形貌对类骨磷灰石层形成的影响研究

磷酸钙陶瓷植入体内后其表面类骨磷灰石层的形成是诱导成骨的先决条件。本实验在模拟体液 (Simu-lated body fluid,SBF)以人体骨骼肌组织的正常生理流率 (2 ml/ 10 0 m l· min)下 ,研究在动态 SBF中致密磷酸钙陶瓷表面形貌对类骨磷灰石层形成的影响。结果表明 :在生理流速条件下 ,材料的粗糙表面有利于类骨磷灰石层的形成 ,加大 SBF中 Ca2 +、HPO4 2 -离子浓度 ,类骨磷灰石层的形成速度加快。本研究进一步证实了材料的几何形貌对类骨磷灰石形成的影响 ,加深了对磷酸钙陶瓷在体内诱导成骨机理的理解