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      Targeting VIP and PACAP receptor signalling: new therapeutic strategies in multiple sclerosis

      review-article
      , 1
      ASN NEURO
      American Society for Neurochemistry
      autoimmunity, drug-design, experimental autoimmune encephalomyelitis (EAE), neuroprotection, PACAP, VIP, AC, adenylate cyclase, AD, Alzheimer's disease, ADNF, activity-dependent neurotrophic factor, ADNP, activity-dependent neuroprotective protein, APC, antigen-presenting cells, BM, bone marrow, Bz-Phe, benzophenone-Phe, CCR, CC chemokine receptor, , CIA, collagen-induced arthritis, CNS, central nervous system, DC, dendritic cell, DMD, disease-modifying drug, DSS, dextran sodium sulfate, EAE, experimental autoimmune encephalomyelitis, FDA, Food and Drug Administration, GPCR, G-protein-coupled receptor, IFN, interferon, IL-6, interleukin 6, JNK, c-Jun N-terminal kinase, KO, knockout, LPS, lipopolysaccharide, MAPK, mitogen-activated protein kinase, MCP-1, monocyte chemoattractant protein 1, MIP-2, macrophage inflammatory protein 2, MOG, myelin oligodendrocyte glycoprotein, MS, multiple sclerosis, MSC, mesenchymal stem cell, NAP, neutrophil-activating protein, NMDA, N-methyl-d-aspartate, PACAP, pituitary adenylate cyclase-activating peptide, PKA, protein kinase A, PKC, protein kinase C, PLC, phospholipase C, PMCAO, permanent middle cerebral artery occlusion, PPMS, primary progressive form of MS, RAMP, receptor-activity-modifying protein, RANTES, regulated upon activation, normal T-cell expressed and secreted, SAPK, stress-activated protein kinase, SCG, superior cervical ganglion, SPMS, secondary progressive form of MS, S-SCAM, synaptic scaffolding molecule, STAT, signal transducer and activator of transcription, TGFβ, transforming growth factor β, TM, transmembrane, TNFα, tumour necrosis factor α, Treg, regulatory T, VIP, vasoactive intestinal peptide, WT, wild-type

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          Abstract

          MS (multiple sclerosis) is a chronic autoimmune and neurodegenerative pathology of the CNS (central nervous system) affecting approx. 2.5 million people worldwide. Current and emerging DMDs (disease-modifying drugs) predominantly target the immune system. These therapeutic agents slow progression and reduce severity at early stages of MS, but show little activity on the neurodegenerative component of the disease. As the latter determines permanent disability, there is a critical need to pursue alternative modalities. VIP (vasoactive intestinal peptide) and PACAP (pituitary adenylate cyclase-activating peptide) have potent anti-inflammatory and neuroprotective actions, and have shown significant activity in animal inflammatory disease models including the EAE (experimental autoimmune encephalomyelitis) MS model. Thus, their receptors have become candidate targets for inflammatory diseases. Here, we will discuss the immunomodulatory and neuroprotective actions of VIP and PACAP and their signalling pathways, and then extensively review the structure–activity relationship data and biophysical interaction studies of these peptides with their cognate receptors.

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          Most cited references212

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          Immunosuppressive effect of mesenchymal stem cells favors tumor growth in allogeneic animals.

          Mesenchymal stem cells (MSCs) are largely studied for their potential clinical use. Recently, they have gained further interest after demonstration of an immunosuppressive role. In this study, we investigated whether in vivo injection of MSCs could display side effects related to systemic immunosuppression favoring tumor growth. We first showed in vitro that the murine C3H10T1/2 (C3) MSC line and primary MSCs exhibit immunosuppressive properties in mixed lymphocyte reaction. We demonstrated that this effect is mediated by soluble factors, secreted only on "activation" of MSCs in the presence of splenocytes. Moreover, the immunosuppression is mediated by CD8+ regulatory cells responsible for the inhibition of allogeneic lymphocyte proliferation. We then demonstrated that the C3 MSCs expressing the human bone morphogenetic protein 2 (hBMP-2) differentiation factor were not rejected when implanted in various allogeneic immunocompetent mice and were still able to differentiate into bone. Importantly, using a murine melanoma tumor model, we showed that the subcutaneous injection of B16 melanoma cells led to tumor growth in allogeneic recipients only when MSCs were coinjected. Although the potential side effects of immunosuppression induced by MSCs have to be considered in further clinical studies, the usefulness of MSCs for various therapeutic applications still remains of great interest.
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            Isolation of a novel 38 residue-hypothalamic polypeptide which stimulates adenylate cyclase in pituitary cells.

            A novel neuropeptide which stimulates adenylate cyclase in rat anterior pituitary cell cultures was isolated from ovine hypothalamic tissues. Its amino acid sequence was revealed as: His-Ser-Asp-Gly-Ile-Phe-Thr-Asp-Ser-Tyr-Ser-Arg-Tyr-Arg-Lys-Gln- Met-Ala- Val-Lys-Lys-Tyr-Leu-Ala-Ala-Val-Leu-Gly-Lys-Arg-Tyr-Lys-Gln-Arg-Val-Lys-Asn-Lys - NH2. The N-terminal sequence shows 68% homology with vasoactive intestinal polypeptide (VIP) but its adenylate cyclase stimulating activity was at least 1000 times greater than that of VIP. It increased release of growth hormone (GH), prolactin (PRL), corticotropin (ACTH) and luteinizing hormone (LH) from superfused rat pituitary cells at as small a dose as 10(-10)M (GH, PRL, ACTH) or 10(-9)M (LH). Whether these hypophysiotropic effects are the primary actions of the peptide or what physiological action in the pituitary is linked with the stimulation of adenylate cyclase by this peptide remains to be determined.
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              Myelin-specific regulatory T cells accumulate in the CNS but fail to control autoimmune inflammation.

              Treatment with ex vivo-generated regulatory T cells (T-reg) has been regarded as a potentially attractive therapeutic approach for autoimmune diseases. However, the dynamics and function of T-reg in autoimmunity are not well understood. Thus, we developed Foxp3gfp knock-in (Foxp3gfp.KI) mice and myelin oligodendrocyte glycoprotein (MOG)(35-55)/IA(b) (MHC class II) tetramers to track autoantigen-specific effector T cells (T-eff) and T-reg in vivo during experimental autoimmune encephalomyelitis (EAE), an animal model for multiple sclerosis. MOG tetramer-reactive, Foxp3(+) T-reg expanded in the peripheral lymphoid compartment and readily accumulated in the central nervous system (CNS), but did not prevent the onset of disease. Foxp3(+) T cells isolated from the CNS were effective in suppressing naive MOG-specific T cells, but failed to control CNS-derived encephalitogenic T-eff that secreted interleukin (IL)-6 and tumor necrosis factor (TNF). Our data suggest that in order for CD4(+)Foxp3(+) T-reg to effectively control autoimmune reactions in the target organ, it may also be necessary to control tissue inflammation.
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                Author and article information

                Journal
                ASN Neuro
                ASN
                ASN NEURO
                American Society for Neurochemistry (9037 Ron Den Lane, Windermere, FL 34786 )
                1759-0914
                7 September 2011
                6 October 2011
                2011
                : 3
                : 4
                : e00065
                Affiliations
                [1]The Semel Institute and Department of Psychiatry, the David Geffen School of Medicine, University of California, Los Angeles, CA 90095, U.S.A.
                Author notes
                1To whom correspondence should be addressed (email JWaschek@ 123456mednet.ucla.edu ).
                Article
                e00065
                10.1042/AN20110024
                3189630
                21895607
                ebb94c82-c305-491f-8606-892ef560eae7
                © 2011 The Author(s).

                This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial Licence ( http://creativecommons.org/licenses/by-nc/2.5/) which permits unrestricted non-commercial use, distribution and reproduction in any medium, provided the original work is properly cited.

                History
                : 9 August 2011
                : 7 September 2011
                Categories
                Review Article
                S6
                S7

                Neurosciences
                tgfβ, transforming growth factor β,neuroprotection,ac, adenylate cyclase,bz-phe, benzophenone-phe,mip-2, macrophage inflammatory protein 2,tm, transmembrane,ko, knockout,msc, mesenchymal stem cell,cns, central nervous system,gpcr, g-protein-coupled receptor,plc, phospholipase c,eae, experimental autoimmune encephalomyelitis,mapk, mitogen-activated protein kinase,pacap, pituitary adenylate cyclase-activating peptide,treg, regulatory t,pacap,nap, neutrophil-activating protein,nmda, n-methyl-d-aspartate,scg, superior cervical ganglion,ifn, interferon,vip, vasoactive intestinal peptide,bm, bone marrow,sapk, stress-activated protein kinase,experimental autoimmune encephalomyelitis (eae),autoimmunity,ccr, cc chemokine receptor, ,ms, multiple sclerosis,tnfα, tumour necrosis factor α,fda, food and drug administration,lps, lipopolysaccharide,wt, wild-type,stat, signal transducer and activator of transcription,il-6, interleukin 6,jnk, c-jun n-terminal kinase,dc, dendritic cell,dss, dextran sodium sulfate,mcp-1, monocyte chemoattractant protein 1,ppms, primary progressive form of ms,apc, antigen-presenting cells,spms, secondary progressive form of ms,cia, collagen-induced arthritis,pmcao, permanent middle cerebral artery occlusion,dmd, disease-modifying drug,s-scam, synaptic scaffolding molecule,rantes, regulated upon activation, normal t-cell expressed and secreted,adnf, activity-dependent neurotrophic factor,ramp, receptor-activity-modifying protein,adnp, activity-dependent neuroprotective protein,pka, protein kinase a,drug-design,ad, alzheimer's disease,mog, myelin oligodendrocyte glycoprotein,vip,pkc, protein kinase c
                Neurosciences
                tgfβ, transforming growth factor β, neuroprotection, ac, adenylate cyclase, bz-phe, benzophenone-phe, mip-2, macrophage inflammatory protein 2, tm, transmembrane, ko, knockout, msc, mesenchymal stem cell, cns, central nervous system, gpcr, g-protein-coupled receptor, plc, phospholipase c, eae, experimental autoimmune encephalomyelitis, mapk, mitogen-activated protein kinase, pacap, pituitary adenylate cyclase-activating peptide, treg, regulatory t, pacap, nap, neutrophil-activating protein, nmda, n-methyl-d-aspartate, scg, superior cervical ganglion, ifn, interferon, vip, vasoactive intestinal peptide, bm, bone marrow, sapk, stress-activated protein kinase, experimental autoimmune encephalomyelitis (eae), autoimmunity, ccr, cc chemokine receptor, , ms, multiple sclerosis, tnfα, tumour necrosis factor α, fda, food and drug administration, lps, lipopolysaccharide, wt, wild-type, stat, signal transducer and activator of transcription, il-6, interleukin 6, jnk, c-jun n-terminal kinase, dc, dendritic cell, dss, dextran sodium sulfate, mcp-1, monocyte chemoattractant protein 1, ppms, primary progressive form of ms, apc, antigen-presenting cells, spms, secondary progressive form of ms, cia, collagen-induced arthritis, pmcao, permanent middle cerebral artery occlusion, dmd, disease-modifying drug, s-scam, synaptic scaffolding molecule, rantes, regulated upon activation, normal t-cell expressed and secreted, adnf, activity-dependent neurotrophic factor, ramp, receptor-activity-modifying protein, adnp, activity-dependent neuroprotective protein, pka, protein kinase a, drug-design, ad, alzheimer's disease, mog, myelin oligodendrocyte glycoprotein, vip, pkc, protein kinase c

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