Abstract
Tourette syndrome (TS) is a neuropsychiatric disorder in which dopaminergic dysfunction and immune system abnormalities seem to coexist. Using real-time PCR, we determined mRNA expression of dopamine receptors (DRs) D1-5 in peripheral blood lymphocytes (PBLs) from 15 TS patients and 15 sex- and age-matched healthy controls (HCs). DRD5 mRNA levels in cells from TS were higher than in cells from HCs. In TS patients with obsessive–compulsive disorder, DRD5 mRNA levels in PBLs showed a highly positive correlation with the severity of compulsive symptoms. DRD5 mRNA upregulation in PBLs from TS patients may represent a peripheral marker of dopaminergic dysfunction and supports the involvement of the immune system in TS.
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