Abstract
Parkinson's disease (PD) is a slowly progressive neurodegenerative disorder characterized by the loss of dopaminergic neurons in the Substantia Nigra pars compacta (SNpc), striatal dopamine deficiency and appearance of Lewy bodies. Inflammatory and immune, or even autoimmune, stigmata, have been described in post-mortem brains of PD patients. Although disputed in humans, a reactive astrocytosis and a lymphocytic infiltration in the SNpc have been observed in animal models of PD, which need further examination. This review summarizes the current knowledge on brain inflammation in humans with PD, and how inflammation and/or (auto)immune reactions within the SNpc could be linked to other pathophysiological mechanisms that have been hypothesized for the etiology of PD, such as oxidative stress, exposure to neurotoxins, and post-infectious or post-traumatic injuries. In particular, we discuss how microglial cells could be activated during the course of PD, and present a new hypothesis that PD-linked protein (alpha-synuclein, in particular) aggregates could be implicated in their activation, to induce a chronic and sustained inflammation involved in the progression, at least, of the disease. The current status of anti-inflammatory ag...Continue Reading
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