Title:LincRNA-p21 Promotes Cellular Senescence by Down-regulating the
Wnt/β-catenin Pathway in MPP+-treated SH-SY5Y Cells
Volume: 26
Issue: 14
Author(s): Jianyu Zhu and Lingli Chen*
Affiliation:
- Department of Neurology, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou,
325000, People’s Republic of China
Keywords:
Lincrna-p21, senescence, Wnt/β catenin pathway, 1-methyl-4-phenylpyridinium, SH-SY5Y, DAT.
Abstract:
Aim and Objective: Long intergenic non-coding RNA-p21 (lincRNA-p21) plays a critical
role in various senescence-associated physiological and pathological conditions. We aimed to
explore the senescence-associated effects of lincRNA-p21 in 1-methyl-4-phenylpyridinium (MPP+)
treated neuroblastoma SH-SY5Y cell line as a therapeutic target.
Materials and Methods: The RNA expression levels of lincRNA-p21, p53, p16, and telomere
length were examined with reverse transcription-quantitative polymerase chain reaction (RTqPCR).
The Telo TAGGG™ Telomerase PCR ELISA PLUS Kit was used to determine telomerase
activity. Cellular viability was evaluated with the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium
bromide (MTT) assay and lactate dehydrogenase (LDH) assay. Western blot was performed
to analyze β-catenin protein expression. Besides, oxidative stress was evaluated by Jaggregate-
forming delocalized lipophilic cation, 5,5',6,6'-tetrachloro-1,1',3,3'-
tetraethylbenzimidazolocarbocyanine++ + iodide (JC‑1) stain, fluorescence spectrophotometry,
colorimetric assay, and malondialdehyde (MDA) formation.
Results: This research demonstrated that MPP+ caused a distinct increase in the expression of LincRNA-
p21 in SH-SY5Y cells. MPP+ induced cellular senescence with decreasing cellular proliferation
and viability, increasing expression levels of senescence-associated makers such as genes p53
and p16, accompanied by significantly decreasing telomere length and telomerase activity. At the
same time, these effects were abolished by silencing lincRNA-p21 with small interfering RNA
(siRNA). On the contrary, β-catenin silencing contributes to reversing anti-senescent effects caused
by lincRNA-p21 silencing. Moreover, modifying lincRNA-p21 exerted an anti-senescent influence
depending on decreasing oxidant stress.
Conclusion: Our study showed that in the treatment of MPP+, lincRNA-p21 might serve a role in
the SH-SY5Y cell senescence by modulating the Wnt/β-catenin pathway, as well as increasing oxidant
stress. Thus, trying to target lincRNA-p21 may have important therapeutic and practical implications
for PD.