A lncRNA survey finds increases in neuroprotective LINC-PINT in Parkinson's disease substantia nigra.

Recent reports highlight regulatory functions of long noncoding RNAs (lncRNAs) in neurodegeneration and aging, but biomedical implications remain limited. Here, we report an rRNA-depletion-based long RNA-Sequencing Resource of 65 substantia nigra, amygdala, and medial temporal gyrus samples from Parkinson's disease (PD) and matched control brains. Using a lncRNA-focused analysis approach to identify functionally important transcripts, we discovered and prioritized many lncRNAs dysregulated in PD. Those included pronounced elevation of the P53-induced noncoding transcript LINC-PINT in the substantia nigra of PD patients, as well as in additional models of oxidative stress and PD. Intriguingly, we found that LINC-PINT is a primarily neuronal transcript which showed conspicuous increases in maturing primary culture neurons. LINC-PINT also accumulated in several brain regions of Alzheimer's and Huntington's disease patients and decreased with healthy brain aging, suggesting a general role in aging and neurodegeneration for this lncRNA. RNAi-mediated depletion of LINC-PINT exacerbated the death of cultured N2A and SH-SY5Y cells exposed to oxidative stress, highlighting a previously undiscovered neuroprotective role for this tumor-inducible lncRNA in the brains of patients with neurodegenerative disorders.