Proteomic characterization of Jurkat T leukemic cells after dopamine stimulation: A model of circulating...

T-cells are circulating dopamine-sensitive cells and may mirror, at the peripheral level, biochemical modifications occurring in dopaminergic neurons. The human CD4+ T leukemic Jurkat cell line has been thoroughly used and characterized as a suitable cell model to investigate T-cell signaling and apoptosis. Here, we describe their characterization as a model of circulating dopamine-sensitive cells and their response to a dopamine challenge by analyzing changes in the cell proteome. Jurkat cells express both D1- and D2-like dopamine receptors and both membrane and vesicular transporters, while they lack D4 receptor and tyrosine hydroxylase expression. A saturating, non-toxic, non-oxidant 50 μM dopamine challenge induces the upregulation of an interacting chaperone network known to protect specifically dopaminergic neurons, thus validating T-cells as a biomarker discovery source in Parkinson's disease. Remodeling of the distribution pattern of β-actin and 14-3-3 isoforms is consistently observed upon dopamine treatment. As a whole, dopamine-specific alterations here observed might represent a biosensor for dopamine response at the peripheral level.