Abstract
Vasoactive intestinal peptide (VIP) is an anti-inflammatory immunomodulatory neuropeptide with therapeutic potential demonstrated for collagen-induced arthritis. The aim of this study was to characterise its potential anti-arthritic effect on human monocytes, macrophages, T cells, and rheumatoid arthritis synovial membrane cells. Monocytes, macrophages, and T cells derived from human peripheral blood were treated with VIP and compared with other cAMP-elevating drugs for a range of activating stimuli. Cytokine production was assessed for cell cultures and, in addition, the ability of VIPs to activate cAMP response element binding protein. VIP partially suppressed monocyte- and macrophage-derived tumour necrosis factor α (TNF-α) with no effect on IL-10, whereas VIP fails to regulate IL-10 and TNF-α production by T lymphocytes. No such modulation of cytokine profile was observed for rheumatoid arthritis synovial membrane cells. Elevation of intracellular cAMP, on the other hand, potently suppressed macrophage TNF-α production and modulated T-cell response by inhibiting TNF-α and IFN-γ. VIP's lack of effect on IL-10 and its slight effect on TNF-α results from cAMP being rapidly degraded as the phosphodiesterase IV inhibitor, rolipram, rescues cAMP-dependent activation of cAMP response element binding protein. Interestingly, macrophages stimulated with phorbol 12-myristate 13-acetate/ionomycin displayed an augmented IL-10 response upon addition of dibutyryl cAMP, with corresponding downregulation in TNF-α, suggesting a complex interaction between protein kinase C and protein kinase A in cytokine regulation. In conclusion, VIP may represent an efficaceous anti-arthritic treatment modulating macrophage and T-cell cytokine profiles when used alongside a phosphodiesterase inhibitor.
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Abbreviations
- APC:
-
antigen-presenting cell
- ATF-1:
-
activating transcription factor-1
- CIA:
-
collagen-induced arthritis
- CREB:
-
cAMP response element binding protein
- ELISA:
-
enzyme-linked immunosorbent assay
- FCS:
-
fetal calf serum
- IC50:
-
median inhibitory concentration
- IFN:
-
interferon
- IL:
-
interleukin
- LPS:
-
lipopolysaccharide
- M-CSF:
-
macrophage-colony stimulating factor
- NF-κB:
-
nuclear factor κB
- PBMC:
-
peripheral blood mononuclear cells
- PDE:
-
phosphodiesterase
- PKA:
-
protein kinase A
- PKC:
-
protein kinase C
- PMA:
-
phorbol 12-myristate 13-acetate
- RA:
-
rheumatoid arthritis
- RA-SMC:
-
rheumatoid arthritis synovial membrane cell
- RPMI:
-
Roswell Park Memorial Institute [medium]
- Th1/Th2:
-
T helper cell type 1/2
- TNF-α:
-
tumour necrosis factor α
- VIP:
-
vasoactive intestinal peptide.
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Acknowledgements
This work has been funded by a Wellcome Trust project grant and the Kennedy Institute of Rheumatology is supported by a core grant from the Arthritis and Rheumatism Council of Great Britain.
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Foey, A.D., Field, S., Ahmed, S. et al. Impact of VIP and cAMP on the regulation of TNF-α and IL-10 production: implications for rheumatoid arthritis. Arthritis Res Ther 5, R317 (2003). https://doi.org/10.1186/ar999
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DOI: https://doi.org/10.1186/ar999