TNF and Parkinson disease: Two other studies investigating the neuroprotective effects of exercise in mice PD induction models collectively found in swimming [78] and endurance exercise [72] groups: (i) decreased levels of reactive oxygen species, (ii) significant reductions in α-Syn protein along with diminished pro-inflammatory cytokines (TNF-α and IL-β), and (iii) decreased activation of TLR2 and its subsequent downstream signaling cascades (MyD88, TRAF6, and TAK1) [72,78].