Retracted Article: LncRNA MALAT1 aggravates MPP-induced neuronal injury by regulating miR-212 in SH-SY5Y cells.

Parkinson's disease (PD) is the most common neurodegenerative disease and its incidence is rising. Long noncoding RNAs (lncRNAs) have been reported to have essential roles in development of PD. LncRNA metastasis-associated lung adenocarcinoma transcript 1 (MALAT1) is dysregulated in PD, while the role of MALAT1 and its mechanism in PD remain poorly understood. In this study, SH-SY5Y cells were exposed to 1-methyl-4-phenylpyridinium (MPP) to induce a PD model . Then we explored the effect of MALAT1 on cell viability, apoptosis and inflammatory response as well as its interaction with miR-212 in MPP-treated SH-SY5Y cells. The results showed that MALAT1 was up-regulated in MPP-treated SH-SY5Y cells compared with that in the normal group. Overexpression of MALAT1 exacerbated MPP-induced neuronal injury, uncovered by inhibition of cell viability and increase of cell apoptosis as well as inflammatory cytokine expressions in SH-SY5Y cells. However, knockdown of MALAT1 exerted the opposite effect in MPP-treated SH-SY5Y cells. Moreover, MALAT1 was bound to miR-212 and negatively regulated the miR-212 level. Furthermore, addition of miR-212 ablated the regulatory effect of MALAT1 on MPP-induced neuronal injury, as indicated by restoration of cell viability and lower apoptotic rate along with inflammatory cytokine levels in SH-SY5Y cells. Therefore, we concluded that MALAT1 exacerbated MPP-induced neuronal injury through regulating cell viability, apoptosis and inflammatory cytokines by sponging miR-212, providing a novel theoretical foundation for application of MALAT1 in PD.