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The Journal of Immunology, 1999, 163: 4213-4223.
Copyright © 1999 by The American Association of Immunologists

VIP and PACAP Differentially Regulate the Costimulatory Activity of Resting and Activated Macrophages Through the Modulation of B7.1 and B7.2 Expression1

Mario Delgado*,{dagger}, Wei Sun*, Javier Leceta{dagger} and Doina Ganea2,*

* Department of Biological Sciences, Rutgers University, Newark, NJ 07102; and {dagger} Departamento Biologia Celular, Universidad Complutense, Madrid, Spain

Vasoactive intestinal peptide (VIP) and pituitary adenylate cyclase activating polypeptide (PACAP), two structurally related neuropeptides produced and/or released within the lymphoid microenvironment, modulate numerous immune functions. Although primarily antiinflammatory in nature, VIP and PACAP also affect resting macrophages. In this study, we report on in vitro and in vivo dual effects of VIP/PACAP on the expression of B7.1 and B7.2 and on the costimulatory activity for T cells in unstimulated and LPS/IFN-{gamma}-activated macrophages. VIP and PACAP up-regulate B7.2, but not B7.1, expression and induce the capacity to stimulate the proliferation of naive T cells in response to soluble anti-CD3 or allogeneic stimulation. In contrast, both neuropeptides down-regulate B7.1/B7.2 expression on LPS/IFN-{gamma}-activated macrophages and inhibit the endotoxin-induced costimulatory activity for T cells. Interestingly, both the stimulatory and the inhibitory effects of VIP/PACAP are mediated through the specific receptor VPAC1 and involve the cAMP/protein kinase A transduction pathway. The dual effect on B7.1 and B7.2 expression occurs at both mRNA and protein level and correlates with the VIP/PACAP regulation of the macrophage costimulatory activity. Through their regulatory role for resting and activated macrophages, VIP and PACAP act as endogenous participants in the control of immune homeostasis. Their effects depend not only on the timing of their release, but also on the activation and differentiation state of the neighboring immune cells.




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