儿童幽门螺杆菌相关霉素的检测及临床意义

目的探讨不同H.pylori菌株类型与小儿胃十二指肠黏膜疾病的关系,了解本地区儿童感染的H.pylori菌株类型。方法胃镜下活检及快速尿素酶试验诊断H.pylori感染及观察胃十二指肠黏膜病理变化,用免疫印迹法测定153例H.pylori阳性患儿血清多种H.pylori毒素抗体。结果胃炎患儿Ⅰ型H.pylori菌株为14例(27%),十二指肠球部溃疡患儿Ⅰ型H.pylori菌株为43例(74%),两组检出率比较差异有显著性。CagA抗体阳性者黏膜中重度炎性反应58例(92%),CagA抗体阳性者黏膜轻度炎性反应21例(35%),两组检出率比较差异有显著性。结论本地区儿童感染的H.pylori为Ⅰ型和Ⅱ型毒力菌株,CagA抗体阳性能引起胃十二指肠黏膜较重的炎性反应。     

慢性浅表性胃炎胃粘膜的损伤程度与CagAHP的关系

目的　分析慢性浅表性胃炎 (CGA)胃粘膜的损伤程度与幽门螺杆菌 (HP)细胞毒素相关蛋白A (CagA)的关系。方法　将 13 0例HP阳性CGA患者分为CagA+ HP胃炎组 (92例 )、CagA-HP胃炎组 (3 8例 )两组 ,观察评定两组患者胃粘膜炎症的损害程度、肠上皮化生、不典型增生情况。结果　CagA+ HP组的胃粘膜炎症损害程度明显高于CagA-HP组(χ2 =16.765 ,P <0 .0 5 ) ;但两组肠上皮化生和不典型增生比较差异无显著性 (P >0 .0 5 )。结论　感染CagA+ HP患者 ,其胃粘膜炎症损害程度高。     

硒和维生素C对白血病细胞增殖及细胞毒性的研究

目的本文主要研究硒和维生素Ｃ影响髓系与非髓系白血病细胞增殖及其细胞毒性的异同。方法体外培养髓系白血病细胞株ＨＬ６０及非髓系细胞株Ｋ５６２，培养时分别设Ｓｅ（５μｍ、８μｍ、１１μｍ）及ＶｉｔＣ（５μｍ、１０μｍ、１００μｍ）实验组及对照组，培养２４ｈ、４８ｈ、７２ｈ后分别取样，利用台盼蓝拒染法进行细胞计数，绘制细胞生长曲线，并通过噻唑蓝比色分析法研究Ｓｅ及ＶｉｔＣ对ＨＬ６０、Ｋ５６２细胞毒性。结果细胞生长曲线显示：Ｓｅ（５～１１μｍ）及ＶｉｔＣ（５～１０μｍ）对ＨＬ６０、Ｋ５６２细胞增殖均有抑制作用。ＭＴＴ结果显示：Ｓｅ（５～１５μｍ）对两种细胞均有细胞毒性。ＶｉｔＣ（５～１０μｍ）对ＨＬ６０具有细胞毒性，而ＶｉｔＣ（５～１００μｍ）对于Ｋ５６２，短时间内毒性作用较明显，随作用时间延长而减弱。结论本实验结果提示：Ｓｅ及ＶｉｔＣ对髓系和非髓系白血病细胞增殖均有抑制作用，但ＶｉｔＣ对于ＨＬ６０和Ｋ５６２作用机制是不同的。这为白血病的化学预防和临床辅助治疗提供一定的理论依据。     

福建产舟山眼镜蛇毒细胞毒素的快速分离纯化及鉴定

目的 从舟山眼镜蛇毒中分离纯化细胞毒素(CTX)，并鉴定其理化性质。方法 采用SP—Sephadex C-25阳离子交换色谱及Sephasil Peptide C18反相高效液相色谱法从舟山眼镜蛇毒中分离纯化CTX，SDS—PAGE(Tris—Tricine系统)鉴定纯度，Edman降解法测定N端氨基酸序列。结果 粗毒经阳离子交换色谱，得到14个蛋白峰，其中第X～XⅢ峰具CTX活性；再分别经反相色谱纯化，得到4个CTX．总得率为32.48％；SDS—PAGE显示为均一蛋白，分子量依次为：7．28，7．33，7．24和7．38kD；测定它们N端20个氨基酸序列。结论 采用阳离子交换和反相高效液相色谱可快速、高效地从眼镜蛇毒中获得4个CTX纯品。     

Opposing Neuroendocrine Actions of the Natriuretic Peptides: C-Type and A-Type Natriuretic Peptides do not Interact with the same Hypothalamic Cells Controlling Prolactin Secretion

The two major members of the family of natriuretic peptides (NPs) in brain, A-type natriuretic peptide (ANP) and C-type natriuretic peptide (CNP) exert opposing actions on the neuroendocrine regulation of prolactin (PRL) secretion. We have targeted for compromise and destruction cells within the diencephalon which bear receptors for ANP (NPR-A receptors), CNP (NPR-B receptors), or both peptides (NPR-C receptors) using novel cytotoxin cell targeting methodology in order to determine if the neuroendocrine effects of these two peptides are exerted on similar cell systems. In animals pretreated with ANP conjugated to the cytotoxic A chain of ricin, central administration of a dose of ANP which is known to inhibit PRL secretion did not alter PRL levels in plasma; however, subsequent administration of CNP elicited the stimulation of PRL secretion. In rats pretreated with CNP-ricin A chain conjugate, a treatment we hypothesize targets for destruction CNP responsive cells, ANP injection did inhibit PRL secretion, while the stimulatory effect of CNP was absent. These results suggest that the neuroendocrine effects of these two natriuretic peptides on PRL secretion are expressed on different cellular elements of the hypothalamo-pituitary axis. Furthermore, they reveal that neither peptide acts directly on the tuberoinfundibular dopamine system since pretreatment with either cytotoxin conjugate failed to alter basal PRL levels. Thus ANP and CNP do not appear to express opposing actions on the same cell systems, suggesting the recruitment of each peptide individually by differing, unique stimuli for PRL release.     

血清CagA抗体鉴定幽门螺杆菌高毒株感染的评价

目的 评价通过检测血清CagA抗体鉴定幽门螺杆菌高毒株感染的可行性.方法 采集福州地区临床门诊行胃镜检查的胃活检标本,行病理检查和幽门螺杆菌(Hp)培养;采集病人血清,PCR法检测分离所得的Hp cagA基因;EIA法测定血清CagA抗体,分析cagA基因的检出与消化性疾病的关系,比较CagA基因与CagA抗体的检测结果,评价应用CagA抗体检测Hp高毒株感染的可行性.结果 分离获得80株Hp,其中54株检出cagA基因,阳性率67.50%.各病理类型胃病患者cagA基因阳性率:浅表性胃炎77.42%,萎缩性胃炎62.86%,胃溃疡58.33%,胃癌50.00%,各组间差别无统计学意义(P＞0.05);CagA抗体阳性率55.00%,敏感度74.07%,特异度84.62%,约登指数58.69%,调整一致性77.68%.结论 检测血清CagA抗体用于诊断高毒力Hp感染存在局限性.     

Cag A Hp抗体测定与消化性溃疡和慢性胃炎的关系

目的 :探讨幽门螺杆菌细胞毒素相关基因蛋白 (CagA)抗体与消化性溃疡和慢性胃炎的关系。方法 :对132例消化性溃疡和慢性胃炎Hp幽门螺杆菌阳性的 118例病例 ,用ELISA方法进行CagA抗体检测。结果 :10 9例消化性溃疡中 ,CagA抗体阳性 90例 ,阳性率 82 .6 % ;9例慢性胃炎中 ,CagA抗体阳性 5例 ,阳性率 5 5 .6 %。消化性溃疡组CagA阳性率明显高于慢性胃炎组 (P <0 .0 1)。结论 :CagA抗体检测在消化性溃疡中有一定意义     

Medicinal potential of Passiflora foetida L. plant extracts: biological and pharmacological activities

OBJECTIVE： To investigate analgesic, antidiarrhoeal and cytotoxic activities of the ethanol extract of Passiflora foetida L. （Passifloraceae） by three experimental methods. METHODS： Analgesic activity of the ethanol extract of Passiflora foetida L. （EEPF） was carried out using acetic acid-induced writhing inhibition in mice. The method of castor oil-induced diarrhoea in mice was utilized to evaluate antidiarrhoeal activity. The cytotoxic activity of EEPF was explored with a brine shrimp lethality bioassay. RESULTS： The extract showed 68.75% and 30.00% inhibition of writhe at the doses of 500 and 250 mg/kg body weight, respectively. The extract increased the mean latent period prior to diarrhoeal onset to about 1.55 h and 1.17 h, and decreased the mean number of stools to 4.4 and 5.6 at the doses of 500 and 250 mg/kg body weight. The extract also demonstrated cytotoxic activity in the brine shrimp lethality assay, and the median lethal concentration for brine shrimp nauplii was 80 pg/mL. CONCLUSION： The results suggest that the plant extract has analgesic and antidiarrhoeal activities, supporting its uses in traditional medicine. The results also demonstrate that the plant extract possesses cytotoxic activities.     

大肠埃希菌植物毒素Gelonin核心功能区表达和纯化及抗肿瘤活性研究

目的:在大肠埃希菌中表达纯化植物毒素Gelonin核心功能区△Gel(S8-K200),并研究其抗肿瘤活性。方法:以pET30a( )-Gelonin为模板,采用PCR方法扩增△Gel基因,克隆插入pEASY-B载体,测序鉴定后插入pET30a( )载体,转化感受态细胞BL21(DE3)pLysS,诱导表达并纯化目的蛋白,并观察其抗肿瘤活性和细胞毒性。结果:△Gel(S8-K200)目的基因的大小约为600bp,SDS-PAGE电泳显示目的蛋白的大小约为27×103,体外实验结果显示,△Gel和Gelonin对肿瘤细胞系HL-60具有明显的杀伤作用,而对正常人胚肺细胞系WI-38毒性极小。结论:Ge-lonin核心功能区△Gel保持了Gelonin毒素蛋白全部的抗肿瘤活性,具有很好的开发前景。     

奥美拉唑对胃癌上皮细胞株、幽门螺杆菌及空泡毒素作用的体外试验

目的 :通过奥美拉唑对胃癌上皮细胞、幽门螺杆菌 (Hp)菌株生长及空泡毒素 (VacA)毒性的影响 ,探讨其临床应用价值。方法 :应用不同浓度奥美拉唑和细胞、细菌及VacA共孵育方法观察细胞、细菌的生长状况及空泡毒性的变化。结果 :(1)当奥美拉唑浓度 >10 0mg·L- 1时 ,细胞 10 0 %死亡 ;低于4 0mg·L- 1时 ,光镜下未见上皮细胞的形态学改变。(2 )当奥美拉唑≥ 10 0mg·L- 1时 ,细菌生长完全被抑制 ;低于 30mg·L- 1,细菌的生长不受影响。 (3)低浓度奥美拉唑 (10～ 4 0mg·L- 1)能部分抑制Va cA毒素对SGC 790 1的空泡作用 ,但不抑制毒素对HeLa细胞的空泡毒性作用。结论 :抑制Hp生长所需的奥美拉唑浓度对胃上皮细胞也有损伤作用 ,对空泡毒素无显著的抑制作用 ,临床上只能应用低剂量奥美拉唑 ,通过抑制胃酸分泌治疗酸相关疾病 ,而非抑制Hp生长