Granzyme B mediates neurotoxicity through a G-protein-coupled receptor

FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology
Tongguang WangAvindra Nath

Abstract

Neuroinflammatory diseases such as multiple sclerosis (MS) are characterized by focal regions of demyelination and axonal loss associated with infiltrating T cells. However, the role of activated T cells in causing neuronal injury remains unclear. CD4 and CD8 T cells were isolated from normal donors and polyclonally activated using plate-bound anti-CD3 and soluble anti-CD28. The conditioned T cell supernatants caused toxicity to cultured human fetal neurons, which could be blocked by immunodepleting the supernatants of granzyme B (GrB). Recombinant GrB also caused toxicity in neurons by caspase-dependent pathways but no toxicity was seen in astrocytes. The neurotoxicity was independent of perforin and could not be blocked by mannose-6-phosphate. However, GrB-induced neurotoxicity was sensitive to pertussis toxin, implicating the stimulation of Gialpha protein-coupled receptors. GrB caused a decrease in cAMP levels but only modest increases in intracellular calcium. The effect on intracellular calcium could be markedly potentiated by stromal-derived factor 1alpha. GrB-induced neurotoxicity could also be blocked by vitamin E and a neuroimmunophilin ligand. In conclusion, GrB may be an important mediator of neuronal injury in T ce...Continue Reading

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