GLP1R and Parkinson disease: In addition to their insulinotropic actions, GLP-1 receptor agonists exhibit beneficial neuroprotective properties in both neurotoxic and synucleinopathy PD models (Harkavyi et al., 2008; Li et al., 2009; Liu et al., 2015; Chen et al., 2018; Yun et al., 2018; Zhang et al., 2019).