Long non-coding RNA MALAT1 regulates cell proliferation and apoptosis via miR-135b-5p/GPNMB axis in Parkinson's disease cell model

Backgrounds: Parkinson's disease (PD) is a common age-related neurodegenerative disorder worldwide. This research aimed to investigate the effects and mechanism underlying long non-coding RNA metastasis-associated lung adenocarcinoma transcript 1 (MALAT1) in PD.

Methods: SK-N-SH and SK-N-BE cells were treated with MPP⁺ to establish the MPP⁺-stimulated cell model of PD, and MALAT1 expression was determined. Then, the effects of MALAT1 depletion on cell proliferation and Apoptosis were determined in the MPP⁺-stimulated cell model of PD. Besides, the correlations between microRNA-135b-5p (miR-135b-5p) and MALAT1 or glycoprotein nonmetastatic melanoma protein B (GPNMB) in MPP⁺-stimulated cell model of PD were explored.

Results: MALAT1 was increasingly expressed and downregulation of MALAT1 promoted cell proliferation while inhibited Apoptosis in MPP⁺-stimulated cells. Besides, miR-135b-5p was a target of MALAT1 and directly targeted to GPNMB. Further investigation indicated that suppression of MALAT1 regulated cell proliferation and Apoptosis by miR-135b-5p/GPNMB axis.

Conclusion: Our findings reveal that MALAT1/miR-135b-5p/GPNMB axis regulated cell proliferation and Apoptosis in MPP⁺-stimulated cell model of PD, providing a potential biomarker and therapeutic target for PD.