Parkinson’s disease (PD) is the second most common neurodegenerative disease afflicting about 1% of people
over 65 years old and 4-5% of people over 85 years. It is proposed that a cascade of deleterious factors is set in motion
within that neuron made not of one, but rather of multiple factors such as free radicals, excitotoxicity, neuroinflammation,
and apoptosis to cite only some of the most salient. In this scenario, chronic systemic inflammation, as well as impaired
mitochondrial metabolism, have also been suspected of playing a role in the development of type-2 diabetes, and the
possibility of a shared pathophysiology of PD and type-2 diabetes has been proposed. The discussion about the
interactions between PD and type-2 diabetes mellitus began in the 1960’s and there is still controversy. Insulin and
dopamine may exert reciprocal regulation hence; hypoinsulinemia induced by streptozotocin decreased the amounts of
dopamine transporter and tyrosine hydroxylase transcripts in the substantia nigra pars compacta. Accordingly, dopamine
depletion in the striatum is able to decreases insulin signaling in basal ganglia, indicating that, perhaps, PD may be
considered as a risk factor for the development of type-2 diabetes mellitus. In this sense, it is described that peroxisome
proliferator-activated receptor-γ, ATP-sensitive K+ channels, AMP-activated protein kinase, glucagon-like peptide-1 and
dipeptidyl peptidase-4 are important therapeutic targets for PD and reinforces the association with diabetes. Therefore, the
objective of the present review is to contextualize the mutual pathophysiological interactions between PD and type-2
diabetes mellitus, as well as the potential common treatments.
Dopamine, Treatment, Peroxisome proliferator-activated receptor-γ, Type-2 diabetes mellitus, Parkinson´s disease.
Universidade Federal do Parana, Setor de Ciencias Biologicas, Departamento de Fisiologia, Av. Francisco H. dos Santos s/n, ZIP: 81.531 – 990, Caixa Postal: 19031, Curitiba, Parana, Brasil.