Parkinson's disease (PD) is characterised by low-level systemic inflammation, which may be at least partly due to pathophysiological activation of immunity. Here, the frequencies of different types of circulating dendritic cells (DCs) with and without a pro-inflammatory phenotype were determined in PD patients and controls. A high proportion of older people is infected with cytomegalovirus (CMV), which acts as a chronic antigenic stressor that could also contribute to increased inflammation. Following this idea, we found higher frequencies of myeloid DCs with a pro-inflammatory CD16+ILT2(high) phenotype in CMV-positive PD patients than controls, suggesting the potential involvement of CMV in exacerbating PD.
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