Indução de Murino inflamação intestinal por transferência adotiva de Effector CD4<sup> +</sup> CD45RB<sup> Alta</sup> Células T em imunodeficientes Mice
Summary
Here, we present a protocol to induce colonic inflammation in mice by adoptive transfer of syngeneic CD4+CD45RBhigh T cells into T and B cell deficient recipients. Clinical and histopathological features mimic human inflammatory bowel diseases. This method allows the study of the initiation of colonic inflammation and progression of disease.
Abstract
Existem muitos modelos diferentes de animais disponíveis para estudar a patogênese de doenças humanas inflamatórias intestinais (DII), cada um com suas próprias vantagens e desvantagens. Descrevemos aqui um modelo de colite experimental que é iniciada por transferência adoptiva de células de baço singeneicas CD4 + CD45RB high T em ratinhos deficientes em receptores de células T e B. A população de células T CD4 + elevada CD45RB que consiste em grande parte de células efectoras naive é capaz de induzir a inflamação intestinal crónica, assemelhando-se intimamente os aspectos chave da DII humana. Este método pode ser manipulado para estudar os aspectos do aparecimento e progressão da doença. Além disso, ele pode ser utilizado para estudar a função de inata e adaptativa, e as populações de células imunitárias reguladoras, e o papel da exposição ambiental, ou seja, a microbiota, na inflamação intestinal. Neste artigo, ilustram a metodologia para a indução de colite com um protocolo passo-a-passo. Este includes um vídeo de demonstração de aspectos técnicos essenciais necessários para desenvolver com sucesso este modelo murino de colite experimental para fins de pesquisa.
Introduction
The inflammatory bowel diseases (IBD) Crohn’s disease and ulcerative colitis result from an incompletely defined and complex interaction between host immune responses, genetic susceptibility, environmental factors, and the enteric luminal contents1. Recent genome-wide association studies report associations between immune cell regulatory genes and IBD susceptibility2,3. Both innate and adaptive immune cell intrinsic genes are represented in these studies, indicating a central role for these cell populations in IBD pathogenesis.
There currently exist more than 50 animal models of human IBD. While no one model perfectly phenocopies human IBD, many are useful for studying various aspects of human disease, including disease onset and progression and the wound-healing response. In the method described here, intestinal inflammation is initiated with syngeneic splenic CD4+CD45RBhigh T cell adoptive transfer into T and B cell deficient recipient mice4. The CD4+CD45RBhigh T cell population contains mainly naïve T cells primed for activation that are capable of inducing chronic small bowel and colonic inflammation. This method allows the researcher to modify key experimental variables, including both innate and adaptive immune cell populations, to answer biologically relevant questions relating to disease pathogenesis. Additionally, this method provides precise initiation of disease onset and a well-characterized experimental time course. This permits the kinetic study of clinical features of disease progression in mice. Intestinal inflammation induced by this method shares many features with human IBD, including chronic large and small bowel transmural inflammation, pathogenesis driven by cytokines such as TNF and IL-12, and systemic symptoms such as wasting5. Thus, it is an ideal model system for studying the pathogenesis of human IBD.
The method here describes in detail the protocol for inducing experimental colitis by adoptive transfer of CD4+CD45RBhigh T cells into Rag1-/- mice. We discuss key technical steps, expected results, optimization, and trouble-shooting. We address the required elements for the successful development of this murine model of intestinal inflammation for research purposes.
Protocol
Representative Results
Discussion
Aqui nós descrevemos um protocolo passo-a-passo induzindo a inflamação do cólon em camundongos por transferência adotiva de células CD4 + T + CD45RB em ratos imunodeficientes. Usamos baços C57BL / 6 doadores e RAG1 singeneico – / – ratinhos receptores, embora outras estirpes (por exemplo, BALB / c, 129S6 / SvEv, não-obesos diabéticos (NOD)) modelos e genéticos da imunodeficiência (por exemplo, SCID, RAG2 – / -) também pode ser ut…
Divulgaciones
The authors have nothing to disclose.
Acknowledgements
Este trabalho foi financiado pela Associação Americana de Gastroenterologia (AGA) Research Award Scholars e Doença de Crohn e Colite Foundation of America (CCFA) Desenvolvimento de Carreira Award (a ENS), NIH NIDDK F30 DK089692 (a ECS) e University of North Carolina Centro de Biologia Gastrointestinal e Doença Grant P30 DK34987 (Histologia Core). O Mecanismo UNC Citometria de Fluxo Core é apoiado em parte por uma NCI Centro de Suporte Grant Núcleo (P30CA016086) à Comprehensive Cancer Center UNC Lineberger. Agradecemos Luke B. Borst da North Carolina State University College de Medicina Veterinária por sua ajuda com a análise histopatológica e imuno-histoquímica.
Materials
| Name of Reagent/ Equipment | Company | Catalog Number | Comments/Description |
| 10x PBS | Gibco | 14200075 | |
| 12x75mm round-bottom tube | Falcon | 352052 | |
| 15 ml conical | Corning | 430790 | |
| 26g x 3/8 Needle | BD Biosciences | 305110 | |
| 50 ml conical | Corning | 430828 | |
| 70 um Cell Strainer | Fisherbrand | 22363548 | |
| BD IMagnet | BD Biosciences | 552311 | |
| β-mercaptoethanol | Thermo Scientific | 35602 | |
| CD4-FITC IgG2b | eBioscience | 11-0041 | |
| CD45RB-PE IgG2a | BD Pharminogen | 553101 | |
| Complete Media | RPMI-1640, 1% Pen/Strep, 10% FBS, 0.0004% β-ME | ||
| FACS tube + strainer | BD Falcon | 352235 | |
| Glass Microscope Slides | Fisherbrand | 12550A3 | |
| Heat-inactivated FBS | Gemini | 100-106 | |
| Labeling Buffer | 1x PBS, 0.5% BSA, 2 mM EDTA | ||
| Lysis Buffer | 0.08% NH4Cl, 0.1% KHCO3, 1 mM EDTA | ||
| MoFlo XDP | Beckman Coulter | ||
| Mouse CD4 T lymphocyte Enrichment Set – DM | BD Biosciences | 558131 | |
| Mouse IgG2a-PE | BD Pharminogen | 553457 | |
| Mouse IgG2b-FITC | eBioscience | 11-4732 | |
| Pasteur pipet | Fisherbrand | 13-678-20D | |
| Penicillin-Streptomycin Solution, 100X | Corning Cellgro | 30-002-CI | |
| Petri Dish | Fisherbrand | 875713 | |
| Pure Ethanol 200 Proof | Decon Labs | 2705-HC | |
| RPMI-1640 | Gibco | 11-875-093 | |
| Syringe | BD Biosciences | 309597 | |
| Trypan blue | Corning Cellgro | 25-900-CI | |
| Wash Media | RPMI-1640, 1% Pen/Strep, 0.0004% β-ME |
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