Abstract
Vasoactive intestinal peptide (VIP), a well-known immunoregulatory neuropeptide, affects both innate and adaptive immunity, and acts as a major anti-inflammatory factor in animal models of autoimmune diseases. VIP down-regulates the innate immune response by inhibiting the release of proinflammatory cytokines, chemokines, and nitric oxide by activated macrophages, microglia, and dendritic cells. VIP affects the adaptive immune response by reducing the costimulatory capacity of antigen-presenting cells, and by preferentially inducing Th2-type responses. This is accomplished through preferential Th2 differentiation, enhanced survival of Th2 effectors, and the induction of Th2-attracting chemokines. Recently, we discovered a novel mechanism for the immunosuppressive effect of VIP that involves the generation of antigen-specific regulatory T cells (Treg) through the induction of tolerogenic dendritic cells (tDC). In this work, we review the VIP-induced Treg generation both in vivo and in vitro, and the use of VIP-generated Treg in two models of autoimmunity, i.e., collagen-induced arthritis and experimental autoimmune encephalomyelitis, and in bone marrow transplantation as related to graft-versus-host disease and the graft-versus-leukemia response.
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Abbreviations
- APC:
-
antigen presenting cells
- BM:
-
bone marrow
- CII:
-
collagen II
- CIA:
-
collagen-induced arthritis
- CNS:
-
central nervous system
- DC:
-
dendritic cells
- DLN:
-
draining lymph nodes
- EAE:
-
experimental autoimmune encephalomyelitis
- GVHD:
-
graft-versus-host disease
- GVL:
-
graft versus leukemia
- IBD:
-
inflammatory bowel disease
- MOG:
-
myelin/oligodendrocyte glycoprotein
- MS:
-
multiple sclerosis
- Nrp-1:
-
neuropilin 1
- OVA:
-
ovalbumin
- PCCF:
-
pigeon cytochrome c fragment
- PLP:
-
proteolipid protein
- RA:
-
rheumatoid arthritis
- tDC:
-
tolerogenic dendritic cells
- TCR:
-
T cell receptor
- Treg:
-
regulatory T cells
- VIP:
-
vasoactive intestinal peptide
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Acknowledgment
This study was supported by NIH grant 2RO1 AI047325 (D.G. and M.D.), the Spanish Ministry of Health PI04/0674 (M.D.), and the Ramon Areces Foundation (M.D.).
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Ganea, D., Gonzalez-Rey, E. & Delgado, M. A Novel Mechanism for Immunosuppression: from Neuropeptides to Regulatory T Cells. Jrnl Neuroimmune Pharm 1, 400–409 (2006). https://doi.org/10.1007/s11481-006-9044-0
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DOI: https://doi.org/10.1007/s11481-006-9044-0