BDNF and Parkinson disease: Additionally, brain-derived neurotrophic factor (BDNF), an important neurological factor in organisms, has been discovered to play a vital role in the repair of neurons and nervous system after Parkinson's disease [6], and the non-coding ribonucleic acids (RNAs) micro RNA (miR)-103a and miR-30b regulate several downstream signaling pathways to have important effects on neuronal apoptosis, inflammation and cell proliferation as well.