Phenotypic and functional properties of gamma delta T Cells from patients with Guillain Barre syndrome

In this study we have examined the phenotypic and functional properties of circulating gamma delta T cells in patients with Guillain Barre syndrome (G BS), in normal healthy controls, and in patients with active multiple scler osis (MS). Cells expressing the V delta 2 T cell receptor showed elevated e xpression of the C-lectin receptor NKRP1A in both GBS and MS, suggestive of an activated state. However, in patients with GBS these cells failed to re spond to pyrenil-pyrophosphate derivatives and V delta 2 + T cell clones de rived from these patients released lower levels of IFN gamma than V delta 2 + clones derived from controls and MS patients. In contrast, in patients w ith GBS the V delta 1 + subset was expanded, showed elevated expression of NKRP1A and V delta 1 + clones derived from these patients secreted high lev els of IL-4. Our findings of expanded NKRP-1A +, IL-4-producing V delta 1 T cells in the GBS patients suggests the possibility that these cells are ac tivated by the recognition of non-protein antigens in an MHC-unrestricted m anner and contribute to the humoral response to glycolipids that is a hallm ark of this disease. (C) 2000 Elsevier Science B.V. All rights reserved.