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Pertussis toxin alters the innate and the adaptive immune responses in a pertussis-dependent model of autoimmunity.
Journal of Neuroimmunology 2002 August
Pertussis toxin (PTX) is used to promote development of autoimmune diseases. The mechanism(s) are still incompletely understood. We dissected the innate and adaptive immune responses in a PTX-dependent model of autoimmune retinal disease, experimental autoimmune uveoretinitis (EAU), a Th1-driven disease of the neural retina elicited in F344 rats with a peptide derived from the retinal antigen interphotoreceptor retinoid binding protein (IRBP). Our results showed that optimal doses of PTX led to strongly increased innate cytokine responses, followed by enhanced adaptive Th1 immunity and disease. At supraoptimal doses of PTX, EAU was suppressed, the animals exhibited persistent lymphocytosis and had an inhibited chemotactic response to chemokines. We suggest that the suppressive effect of PTX at supraoptimal doses is due to inhibition of lymphocyte emigration from the blood into the target tissue, secondary to inhibition of Gi-protein-coupled chemokine receptor signaling, that persists into the effector phase of disease.
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