共查询到18条相似文献，搜索用时 62 毫秒
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【目的】分别从基因和蛋白水平研究我国部分地区绵羊肺炎支原体(Mycoplasma ovipneumoniae)分离株的分子特征,并了解其免疫原性蛋白的差异。【方法】对分离自8个地区的17株绵羊肺炎支原体进行扩增片段长度多态性(Amplified Fragment Length Polymorphism,AFLP)和十二烷基磺酸钠-聚丙烯酰胺凝胶电泳(Sodium Dodecyl Sulphate-Polyacrylamide Gel Electrophoresis,SDS-PAGE)分析,采用NTsys-2.10e软件对AFLP和SDS-PAGE结果进行聚类,并用绵羊肺炎支原体模式株Y98高免血清对部分分离株进行免疫印迹分析。【结果】当相似系数分别为0.78和0.85时,绵羊肺炎支原体分离株可根据8个来源地区分成8个AFLP群和8个SDS-PAGE群;用8株分离株进行免疫印迹共出现6条蛋白条带,分子质量分别为105 kDa、83 kDa、65 kDa、42 kDa、40 kDa或26 kDa,其中83 kDa和40 kDa蛋白为8个菌株保守的免疫原性蛋白。【结论】我国部分地区绵羊肺炎支原体分离株之间存在遗传差异,不同分离株的主要免疫原性蛋白也存在一定差异,但83 kDa和40 kDa蛋白为其保守的免疫原性蛋白。本研究首次对我国部分地区绵羊肺炎支原体分离株进行了分子分型与免疫印迹分析,结果将为绵羊肺炎支原体病的新型诊断技术开发和疫苗研制奠定理论基础。 相似文献
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目的:探讨尼古丁在诱导的小鼠肺泡巨噬细胞自噬及肺炎发生中的作用。方法:通过碘化丙啶(PI)/Hochest33258染色法检测尼古丁诱导巨噬细胞MH-S死亡;通过Western印迹和电子透射显微镜检测尼古丁诱导MH-S细胞自噬的发生;采用中性红摄取实验检测尼古丁处理后巨噬细胞的吞噬能力;通过攻毒实验检测尼古丁诱导的肺炎。结果:不同浓度尼古丁作用下PI染色的死细胞呈上升趋势;LC3BⅡ蛋白表达具有尼古丁剂量依赖性,并且1μmol/L的尼古丁能够增强LPS预刺激的MH-S细胞自噬发生。电子透射显微镜结果显示在1μmol/L尼古丁的作用下,细胞内自噬体数量增加;MH-S的中性红摄取能力与尼古丁浓度剂量呈负相关性;尼古丁能够诱导小鼠发生肺炎,并降低小鼠体重。结论:尼古丁能够增强肺泡巨噬细胞的自噬水平,并且可以诱导肺炎的发生,有助于进一步研究吸烟与肺炎的关系。 相似文献
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梁伊;丁丑;勾静瑶;周旭;张葆青 《现代生物医学进展》2025,(10):1750-1760
肺炎支原体肺炎（MPP）是一种由肺炎支原体（MP）引起的呼吸系统疾病,其发病机制复杂且多样,涉及多种细胞死亡方式。近年研究显示,程序性细胞死亡（PCD）与MPP有关。PCD包括细胞凋亡、坏死性凋亡、细胞自噬、细胞焦亡、细胞外捕获网化、铁死亡和铜死亡等。因此,深入了解各种PCD机制及其与MMP的关系,分析PCD在MMP发生发展机制中的作用具有重要意义。本文章旨在阐明PCD在MPP研究中的最新进展,分析PCD在疾病进程中的具体作用,并探讨它们作为潜在治疗靶点的可能性。以期为优化MPP的诊断和治疗提供理论基础和实践方向,同时也可为新靶点药物的研发指明方向。 相似文献
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肺炎支原体是引起呼吸道感染的常见病原体之一。近年来,肺炎支原体感染的发病率呈逐年增长趋势。肺炎支原体是介于病毒和细菌之间的原核生物,传播途径是呼吸道飞沫或气溶胶。感染该疾病后主要表现为上呼吸道感染、鼻咽炎、支气管炎、肺炎及严重的肺外并发症,如免疫性溶血性贫血、脑膜脑炎、心肌炎、心包炎、肾炎,严重感染者甚至可导致死亡。肺炎支原体有很强的传染性,经常在儿童集居地及家庭成员中交叉感染,导致久治不愈。对支原体肺炎进行早期诊断不仅可以避免并发症的发生率,也可遏制其继续传播。本文就肺炎支原体感染的致病机制及检测方法的研究,探讨了其对于支原体肺炎的早期诊断和病程监测的意义,将研究现状及展望作一综述。 相似文献
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《微生物学免疫学进展》2015,(4)
支原体巨噬细胞活化脂肽-2(MALP-2)是发酵支原体细胞膜上的一种脂多肽,能特异性识别靶细胞Toll样受体,产生免疫活性。MALP-2除了对机体和细胞有固有的促炎作用以外,还又具有对炎症的负调控作用,对机体的免疫系统也有一定的调节作用。就MALP-2的结构特征及其在疾病的发生、发展、治疗和预防等相关免疫学研究进展做一综述。 相似文献
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目的:探讨儿童哮喘发作与肺炎支原体(MP)感染之间的关系,并分析合并MP感染的患儿的临床表现。方法:将79例2-14岁急性哮喘发作的患儿依据病史分做两组:第一次哮喘发作的35人(始发哮喘组),已经有哮喘病史的44人(复发哮喘组)。采用被动冷凝集法检测两组患儿肺炎支原体抗体(MP-IgM)。结果:始发哮喘组和复发哮喘组分别有16例(45.7%)和10例(22.7%)患儿MP-IgM阳性(P0.05)。始发哮喘组与复发哮喘组MP-IgM阳性的患儿发热和肺部啰音发生率明显高于MP-IgM阴性的患儿(P0.05),血清IgE水平也明显高于MP-IgM阴性的患儿(P0.05)。结论:MP感染与儿童哮喘发作关系密切,合并MP感染的哮喘患儿发热或肺部啰音发生率明显高于未合并MP感染的哮喘患儿。 相似文献
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目的同时用目前常用的几种诊断肺炎支原体（MP）感染的实验方法检测MP,相互比较,得出适于常规诊断MP感染的方法或组合。方法搜集我院于2006年10月至2007年5月间以呼吸道感染入院儿童病例75例,采集其咽拭子和双份血清标本,以多种方法检测有无MP感染：培养法、EIA法测抗原、PCR法测MP-DNA,ELISA法测MP特异性IgG、IgA型抗体以及捕获法ELISA测MP特异性IgM型抗体。结果上述75例儿童中,共计有12例感染MP。以此为基础,上述各方法的敏感度分别是：培养法（25％）、EIA法测抗原（8．3％）、PCR法测MP-DNA（75．0％）、ELISA法测MP特异性IgA型抗体（单份血清为0,双份血清为33．3％）、捕获法ELISA测MP特异性IgM型抗体（单份血清为66．7％,双份血清为100％）。特异度分别是：100％、96．8％、93．7％（93．7％）、98．4％（98．4％）。PCR法和捕获法ELISA测MP特异性IgM型抗体结合后敏感度和特异度分别达到100％和95．2％。结论PCR法测MP-DNA和捕获法ELISA测MP特异性IgM型抗体的组合可高效地诊断MP感染,因而可作为临床诊断MP感染的一个常规组合。 相似文献
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叶斌 《中国微生态学杂志》2007,19(6):569-569
近来,每年都有肺炎支原体感染的散发和不同程度的流行。肺炎支原体(MP)已成为小儿呼吸道感染的重要病原。目前,肺炎支原体与咳嗽变异性哮喘(CVA)的关系越来越受到重视。本文通过对86例咳嗽变异性哮喘进行回顾性分析,现报告如下。1对象与方法1.1对象CVA组:2004年2月至2006年4月在台州市中心医院儿科门诊及随访的病例。所有病例均符合儿童咳嗽变异性哮喘防治常规的诊断标准[1],并血清支原体抗体检测治疗组45 0.61±0.22 6.2±1.5对照组43 0.83±0.38 9.1±1.3P值<0.05<0.05(日本富士株式会社生产,应用颗粒凝集法测定MP-IgM,MP-IgM≥1∶… 相似文献
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Ty J. Werdel Jonathan A. Jenks Thomas E. Besser John T. Kanta Chadwick P. Lehman Teresa J. Frink 《Restoration Ecology》2020,28(2):387-395
Bighorn sheep (Ovis canadensis) were once extirpated from the Black Hills region of South Dakota, U.S.A., mirroring declining populations throughout North America. Since the 1960s, several reintroductions have occurred in the Black Hills to reestablish populations, with varying success. We translocated 26 bighorn sheep from Alberta, Canada, to the Black Hills (February 2015) to restore bighorn sheep to their historic range. Due to prior examinations of cause‐specific survival, subsequent genetic diversity and disease prevalence analyses were required to evaluate success of the restoration effort. We measured a mean allelic diversity of 5.23 (SE = 0.44 [mean number of alleles]) and an observed heterozygosity of 0.71 (SE = 0.06; expected = 0.64 ± 0.05) in the translocated individuals. Translocated bighorn sheep tested negative for Mycoplasma ovipneumoniae at capture. An autogenous vaccine was administered prior to release in an attempt to safeguard the translocated bighorn sheep from infection with a strain known to be resident in adjacent bighorn sheep populations. However, the year following the translocation, a different strain of M. ovipneumoniae was associated with a pneumonia outbreak that resulted in 57.9% mortality. Our results suggest that allelic diversity and heterozygosity were sufficient for long‐term herd establishment, reducing the potential for founder effects. However, the overwhelming mortality associated with pneumonia, via the transfer of M. ovipneumoniae from an unknown source, limited the success or our reintroduction efforts. Successful attempts to restore bighorn sheep to their historic ranges must consider and mitigate potential routes for M. ovipneumoniae transmission pre‐ and post‐reintroduction. 相似文献
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Yulin Zhu Huichun Li Shenggang Ding Yating Wang 《Journal of cellular biochemistry》2018,119(6):4808-4814
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《Cell communication & adhesion》2013,20(3):213-221
In this study, vasoactive intestinal peptide (VIP) is shown to inhibit substrate adherence capacity of rat peritoneal macrophages. The inhibitory response occurred in the 0.1-1, 000 nM range of VIP concentrations and it was a time-dependent process. At 15 min, half maximal inhibition (ICw) was obtained at 0.37 ± 0.26 nM and maximal inhibition (53.8%) at 10?6 M VIP. The inhibitory effect of VIP was correlated with the stimulation by this peptide of cyclic AMP (cAMP) production in rat peritoneal macrophages. Moreover, agents that inhibited VIP-stimulated cAMP production, such as the VIP-antagonist [4-Cl-D-Phe6 Leu17]-VIP and somatostatin, also decreased the inhibitory effect of VIP on substrate adherence capacity of macrophages. On the contrary, the phosphodiesterase inhibitor 3-isobutyl-1-methylxanthine (IBMX) and the lipid-soluble derivative of cAMP N6 2′-O-dibutyryl cAMP (Bu-cAMP) inhibited the adherence of macrophages to substrate and potentiated the inhibitory action of VIP. These results demonstrate that VIP inhibits substrate adherence capacity of rat peritoneal macrophages by a mechanism that involves cAMP, and show, for the first time, an action of VIP on the function of peritoneal macrophages. 相似文献
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Juan Jos Segura Juan Miguel Guerrero Miguel Angel L pez-Gonzalez Juan Ram n Calvo 《Cell communication & adhesion》1993,1(3):213-221
In this study, vasoactive intestinal peptide (VIP) is shown to inhibit substrate adherence capacity of rat peritoneal macrophages. The inhibitory response occurred in the 0.1-1, 000 nM range of VIP concentrations and it was a time-dependent process. At 15 min, half maximal inhibition (ICw) was obtained at 0.37 ± 0.26 nM and maximal inhibition (53.8%) at 10-6 M VIP. The inhibitory effect of VIP was correlated with the stimulation by this peptide of cyclic AMP (cAMP) production in rat peritoneal macrophages. Moreover, agents that inhibited VIP-stimulated cAMP production, such as the VIP-antagonist [4-Cl-D-Phe6 Leu17]-VIP and somatostatin, also decreased the inhibitory effect of VIP on substrate adherence capacity of macrophages. On the contrary, the phosphodiesterase inhibitor 3-isobutyl-1-methylxanthine (IBMX) and the lipid-soluble derivative of cAMP N6 2'-O-dibutyryl cAMP (Bu-cAMP) inhibited the adherence of macrophages to substrate and potentiated the inhibitory action of VIP. These results demonstrate that VIP inhibits substrate adherence capacity of rat peritoneal macrophages by a mechanism that involves cAMP, and show, for the first time, an action of VIP on the function of peritoneal macrophages. 相似文献
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Kezia R. Manlove Annette Roug Kylie Sinclair Lauren E. Ricci Kent R. Hersey Cameron Martinez Michael A. Martinez Kerry Mower Talisa Ortega Eric Rominger Caitlin Ruhl Nicole Tatman Jace Taylor 《Ecology and evolution》2022,12(7)
Ecological context—the biotic and abiotic environment, along with its influence on population mixing dynamics and individual susceptibility—is thought to have major bearing on epidemic outcomes. However, direct comparisons of wildlife disease events in contrasting ecological contexts are often confounded by concurrent differences in host genetics, exposure histories, or pathogen strains. Here, we compare disease dynamics of a Mycoplasma ovipneumoniae spillover event that affected bighorn sheep populations in two contrasting ecological contexts. One event occurred on the herd''s home range near the Rio Grande Gorge in New Mexico, while the other occurred in a captive facility at Hardware Ranch in Utah. While data collection regimens varied, general patterns of antibody signal strength and symptom emergence were conserved between the two sites. Symptoms appeared in the captive setting an average of 12.9 days postexposure, average time to seroconversion was 24.9 days, and clinical signs peaked at approximately 36 days postinfection. These patterns were consistent with serological testing and subsequent declines in symptom intensity in the free‐ranging herd. At the captive site, older animals exhibited more severe declines in body condition and loin thickness, higher symptom burdens, and slower antibody response to the pathogen than younger animals. Younger animals were more likely than older animals to clear infection by the time of sampling at both sites. The patterns presented here suggest that environment may not be a major determinant of epidemiological outcomes in the bighorn sheep—M. ovipneumoniae system, elevating the possibility that host‐ or pathogen‐factors may be responsible for observed variation. 相似文献
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Hany Khalil Mia Tazi Kyle Caution Amr Ahmed Apurva Kanneganti Kaivon Assani 《Epigenetics》2016,11(5):381-388
Autophagy is a biological process characterized by self-digestion and involves induction of autophagosome formation, leading to degradation of autophagic cargo. Aging is associated with the reduction of autophagy activity leading to neurodegenerative disorders, chronic inflammation, and susceptibility to infection; however, the underlying mechanism is unclear. DNA methylation by DNA methyltransferases reduces the expression of corresponding genes. Since macrophages are major players in inflammation and defense against infection we determined the differences in methylation of autophagy genes in macrophages derived from young and aged mice. We found that promoter regions of Atg5 and LC3B are hypermethylated in macrophages from aged mice and this is accompanied by low gene expression. Treatment of aged mice and their derived macrophages with methyltransferase inhibitor (2)-epigallocatechin-3-gallate (EGCG) or specific DNA methyltransferase 2 (DNMT2) siRNA restored the expression of Atg5 and LC3 in vivo and in vitro. Our study builds a foundation for the development of novel therapeutics aimed to improve autophagy in the elderly population and suggests a role for DNMT2 in DNA methylation activities. 相似文献
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研究人参根提取物对巨噬细胞RAW264.7的增殖能力、吞噬能力和自噬水平的影响以及其相关性.用细胞计数试剂(CCK-8)检测不同浓度的人参根以及加入对巨噬细胞RAW264.7增殖的影响;采用中性红吞噬实验检测人参根提取物对巨噬细胞吞噬活性的影响;采用吖啶橙染色法(AO染色法)检测自噬体的形成;采用免疫印迹法(Weste... 相似文献