Desenvolvimento de Células-Tronco de derivados de células T regulatórias antígeno específico da Contra Auto-imunidade
Summary
We present here a method to develop functional antigen (Ag)-specific regulatory T cells (Tregs) from induced pluripotent stem cells (iPSCs) for immunotherapy of autoimmune arthritis in a murine model.
Abstract
As doenças autoimunes surgem devido à perda da auto-tolerância imunológica. As células T reguladoras (Tregs) são importantes mediadores da auto-tolerância imunológica. Tregs representam cerca de 5 – 10% da subpopulação maduro de células T CD4 + em ratinhos e humanos, com cerca de 1 – 2% dos Tregs que circulam no sangue periférico. Induzidas células estaminais pluripotentes (IPSCs) podem ser diferenciados em Tregs funcional, que tem um potencial para ser utilizados para terapias baseadas em células de doenças auto-imunes. Aqui, apresentamos um método para desenvolver antigénio (Ag) Tregs espec�icos de iPSCs (ou seja, IPSC-Tregs). O método baseia-se na incorporação do factor de transcrição Foxp3 e um receptor de células T específico de Ag-(TCR) em iPSCs e, em seguida, a diferenciação em células do estroma expressando Notch OP9 ligandos semelhante a delta (DL) e uma DL4. Seguindo diferenciação in vitro, o CPSP-Tregs expressam CD4, CD8, CD3, CD25, FoxP3, e Ag-TCR específico e são capazes de responder à estimulação Ag.Este método tem sido aplicado com sucesso para a terapia à base de células de artrite auto-imune num modelo murino. A transferência adoptiva destes específica iPSC-Ag-Tregs em artrite induzida por Ag (AIA) -bearing ratinhos tem a capacidade para reduzir a inflamação das articulações e inchaço e para prevenir a perda óssea.
Introduction
Autoimmune arthritis is a systemic disease characterized by hyperplasia of synovial tissue and progressive destruction of articular cartilage, bone, and ligaments1. The defective generation or function of Tregs in autoimmune arthritis contributes to chronic inflammation and tissue injury because Tregs play a crucial role in preventing the development of auto-reactive immune cells.
Manipulation of Tregs is an ideal strategy for the development of therapies to suppress inflammation in an Ag-dependent manner. For Treg-based immunotherapy, the specificity of the transferred Tregs is important for the treatment of ongoing autoimmunity2. To exhibit the suppressive activity, Tregs need to migrate and be retained at the afflicted region, which can be directed by the specificity of the TCR for the Ag at that location3. Although polyclonal Tregs may contain a small population containing this Ag specificity from their TCRs, the numbers of these Ag-specific Tregs are usually low. Consequently, cell-based therapies using polyclonal Tregs against autoimmune disorders require adoptive transfers of a large number of Tregs4,5. Because pluripotent stem cells (PSCs) have the ability to develop into any type of cell, Ag-specific PSC-Tregs may prove to be good candidates for Treg-based immunotherapy. Previous studies have shown the successful development of PSC-derived T cells, including Tregs6-8.
Here, we describe a protocol to develop Ag-specific iPSC-Tregs. We further describe a cell-based therapy of autoimmune arthritis in a murine model using such Tregs. This method is based upon genetically modifying murine iPSCs with Ag-specific TCRs and the transcriptional factor FoxP3. The engineered iPSCs then differentiate into Ag-specific Tregs on the OP9 stromal cells expressing Notch ligands DL1, DL4, and MHC-II (I-Ab) molecules in the presence of cytokines mFlt3L and mIL-7. These Ag-specific iPSC-Tregs can produce suppressive cytokines, such as TGF-β and IL-10, when stimulated with the Ag, and adoptive transfer of such Tregs has the ability to suppress AIA development in a murine model. The described protocol can be used to develop stem cell-derived Ag-specific Tregs for potential therapeutic interventions.
Protocol
Representative Results
Discussion
Neste protocolo, um passo crítico é a diferenciação in vitro de iPSCs transduzidas com genes / FoxP3 TCR. In vitro sinalização Notch induz o desenvolvimento para a linhagem de células T. Para diferenciar iPSCs em células CD4 + Foxp3 + Tregs, foram utilizadas as células B OP9-DL1 / DL4 / IA, que moléculas altamente expressa MHC II (IA b). A maioria dos iPSCs diferenciar-se em células T CD4 +. No entanto, após a expressão de TCR da super…
Disclosures
The authors have nothing to disclose.
Acknowledgements
Este projecto foi financiado, em parte, sob bolsas de Institutos Nacionais de Saúde (R01AI121180, R21AI109239 e K18CA151798), a American Diabetes Association (1-16-IBS-281), e do Departamento de Pensilvânia da Saúde (tabaco fundos de liquidação) para JS
Materials
| C57BL/6j mice | Jackson Laboratory | 664 | |
| B6.129S7 Rag1tm1Mom/J | Jackson Laboratory | 2216 | |
| Anti-CD3 (2C11) antibody | BD Pharmingen | 553058 | |
| Anti-CD28 (37.51) antibody | BD Pharmingen | 553295 | |
| Anti-CD4 (GK1.5) antibody | Biolegend | 100417 | |
| Anti-CD8 (53–6.7) antibody | Biolegend | 100714 | |
| Anti-CD25 (3C7) antibody | Biolegend | 101912 | |
| Anti-TCR-β (H57597) antibody | Biolegend | 109220 | |
| Anti-IL10 | Biolegend | 505010 | |
| Anti-TGFβ | Biolegend | 141402 | |
| DMEM | Invitrogen | ABCD1234 | |
| α-MEM | Invitrogen | A10490-01 | |
| FBS | Hyclone | SH3007.01 | |
| Brefeldin A | Sigma | B7651 | |
| Polybrene | Sigma | 107689 | |
| Genejammer | Integrated science | 204130 | |
| ACK Lysis buffer | Lonza | 10-548E | |
| mFlt-3L | peprotech | 250-31L | |
| mIL-7 | peprotech | 217-17 | |
| Gelatin | Sigma | G9391 | |
| Paraformaldehyde | Sigma | P6148-500G | Caution: Allergenic, Carcenogenic, Toxic |
| Permeabilization buffer | Biolegend | 421002 | |
| mBSA | Sigma | A7906 | |
| Ova albumin | Avantor | 0440-01 | |
| CFA | Difco | 2017014 | |
| Tailveiner restrainer | Braintree scientific | RTV 150-STD |
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