跨体内迟发型变态反应检测方法的抗原特异性调节
Summary
我们描述了一个有价值的诊断方法，有可能被用来决定撤出未经移植排斥反应的风险升高，移植后的免疫抑制。该法采用迟发型超敏反应的原则，并提供准确的评估，既供者特异性效应和调节免疫应答安装收件人。
Abstract
体内 T细胞依赖的免疫应答，宿主的免疫系统在最近的过去经历了一个外来抗原（Ag）的表现形式是一种快速的迟发型超敏反应（DTH）。 DTH反应通常分为致敏阶段，指的是最初的抗原经验，挑战阶段，通常如下致敏后数天。往往被视为无能的证据缺乏的迟发型超敏反应皮肤测试证明召回银。传统的DTH试验已有效地用于诊断许多微生物感染。
尽管共享相似的免疫功能，如淋巴细胞浸润，水肿，组织坏死，直接DTH直喷导致致敏供者抗原与移植物丢失的可能性，因为不是一个可行的诊断技术在移植患者。为了避免这个问题，哼哼开发一个鼠标“体内反”DTH检测1,2。此测试本质上是一个传输的DTH试验，人外周血单核细胞（PBMCs）和特异性抗原皮下注射到羽片或一个天真的的鼠标和DTH像肿胀足垫3 18-24小时后测量。人类抗原提呈细胞如巨噬细胞或区议会高度血管小鼠组织中的T细胞的抗原提呈触发炎症级联反应，并吸引了小鼠的免疫细胞，导致肿胀反应。该反应是抗原特异性的，并需要事先致敏抗原。一个积极的捐助者反应在电视DTH检测反映的DTH反应，移植的病人已经发展向移植同种抗原的亲炎症免疫处置。
在此检测中最重要的特征是，它也可以被用于检测调节性T细胞，从而引起旁观者抑制。一个旁观者抑制供体抗原的存在是的DTH召回响应特征与接受同种异体移植受者2,4-14。同种异体反应性和监管的TV-DTH移植术后监测可能确定谁可以受益于减少免疫抑制的患者没有拒绝或肾功能恶化的风险升高的一个子集。
一个有前途的领域是电视DTH检测监测自身免疫15,16和17在肿瘤免疫学的应用。
Protocol
1。淋巴细胞的制备收集血液进入ACD（酸性柠檬酸葡萄糖）管。 按照标准方法，用淋巴细胞分离液从新鲜人外周血的PBMC隔离。 外周血单个核细胞用PBS三次洗净，去除污染的血小板。血小板被发现干扰反式被检体内的DTH试验。最大允许PBMC制备血小板污染是≤1×10 7 /注塑。 如果有明显的红血细胞污染，执行第一次洗涤后，使用ACK裂解缓冲液裂解红细胞。将ACK缓冲…
Representative Results
1。评估肾移植供体抗原特异性反应使用电视DTH检测为了测试我们的捐助者反应在肾移植术后细胞免疫注射PBMC从这些患者与供者抗原单独或与召回抗原破伤风类毒素（TT）。仅与TT作为阳性对照细胞注射。我们观察到三个主要模式的迟发型超敏反应移植受者（ 图1）。所有患者反应强烈，召回AG（TT）。患者＃62所示的调节柄，其特征在于由一个弱响应于供体抗原和一?…
Discussion
跨体内的DTH检测是一种新型的诊断测试与评估细胞介导的反应，移植，癌症和自身免疫性病人中的一个潜在的临床应用。它是有价值的，因为它不仅是有用的监测召回T效应反应，而且还可以检测调节性T反应。一种可靠的方法来检测人类DTH调控可能预测免疫抑制戒断安全的患者中单药治疗或耐受性试验的候选人是谁。
DTH电视的间接通路的MHC allorecognition的检测是非常敏感?…
Divulgazioni
The authors have nothing to disclose.
Acknowledgements
笔者想承认的贡献AM万巴斯柯克我们的理解的发展DTH反应，移植受者的监管。这项工作是支持的NIH拨款PO1AI084853和R01AI066219-06，由欧盟资助的一个研究。
Materials
| Name of the reagent | Company | Catalogue number | Comments (optional) |
| ACD tube for blood collection | BD | 02-684-26 | |
| Lymphocyte Separation Medium | Cellgro | 25-072-CV | |
| Dulbecco’s Phosphate-Buffered Saline | Cellgro | 21-031-CM | Without calcium & magnesium |
| ACK Lysis Buffer | BioWhittaker | 10-548E | |
| TT/DT or EBV | Sanofi Pasteur Inc./ Meridian Life Science, Inc. | TT/DT 25 μg/injection EBV 8 μg/injection | |
| Protease inhibitor PMSF | Sigma-Aldrich | 78830 | |
| Eosine for cell count | Sigma-Aldrich | E-6003 | |
| Alloantigen | Purified HLA antigens, synthetic allopeptides can be used instead of donor cell-free lysates | ||
| 50 ml sterile centrifuge tubes | Fisher Scientific | 06-443-18 | |
| 10 ml pipettes and pipettor | BD Falcon | 13-675-20 | |
| 2 ml safe-lock tubes | Costar | 3213 | |
| 1000 μl, 100 μl , 10 μl pipettes with sterile tips | |||
| Hemocytometer | Fisher | 02-671-10 | |
| Full size centrifuge and microfuge | Beckman Coulter/Eppendorf | ||
| 1/2cc or 1cc insulin syringes | Becton Dickinson | 14-826-79 | 28 gauge |
| Vibracell sonicator | Divtech Equipment Co. Sonocs& Materials Inc | 2 mm probe | |
| Dial thickness gauge | Mitutoyo, Japan | ||
| SCID mice | Harlan | ||
| Isoflurane | Piramal Healthcare | Inhalant anesthesia |
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Tags
Trans-vivoDelayed-type Hypersensitivity AssayAntigen-specific RegulationT Cell-dependent Immune ResponseForeign AntigenSensitization PhaseChallenge PhaseAnergyTraditional DTH AssayMicrobial InfectionsTransplant PatientsDirect DTHDiagnostic TechniqueHuman-to-mouseTransfer DTH AssayPeripheral Blood Mononuclear Cells (PBMCs)Specific AntigensNaïve MouseSwelling MeasurementAntigen PresentationMacrophagesDCsInflammatory Cascade
Citazione di questo articolo
Jankowska-Gan, E., Hegde, S., Burlingham, W. J. Trans-vivo Delayed Type Hypersensitivity Assay for Antigen Specific Regulation. J. Vis. Exp. (75), e4454, doi:10.3791/4454 (2013).