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NCAM-140 Translocation into Lipid Rafts Mediates the Neuroprotective Effects of GDNF

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Abstract

Glial cell line-derived neurotrophic factor (GDNF) is a potent neurotrophic factor for substantia nigra dopaminergic (DA) neuronal cells. Recent studies have demonstrated that neural cell adhesion molecule functions as a signal transduction receptor for GDNF. The purpose of this study is to reveal whether neural cell adhesion molecule (NCAM) mediates the protective effects of GDNF on DA neuronal cells and further explore the mechanisms involved. We utilized SH-SY5Y cell line to establish a model of 6-hydroxydopamine (6-OHDA)-injured DA neuronal cells. Lentiviral vectors were constructed to knockdown or overexpress NCAM-140, and a density gradient centrifugation method was employed to separate membrane lipid rafts. 3-(4,5-Dimethythiazol-2-yl)-2,5-diphenyl tetrazolium bromide (MTT), flow cytometric analysis, and western blotting were used to evaluate the protective effects of GDNF. The results showed that GDNF could protect 6-OHDA-injured SH-SY5Y cells via improving cell viability and decreasing the cell death rate and cleaved caspase-3 expression. NCAM-140 knockdown decreased cell viability and increased the cell death rate and cleaved caspase-3 expression, while its overexpression had the opposite effects. Notably, the amount of NCAM-140 located in lipid rafts increased after GDNF treatment. Pretreatment with 2-bromopalmitate, a specific inhibitor of protein palmitoylation, suppressed NCAM-140 translocation to lipid rafts and reduced the NCAM-mediated protective effects of GDNF on injured DA neuronal cells. Our results suggest that GDNF have the protective effects on injured DA cells by influencing NCAM-140 translocation into lipid rafts.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (grant numbers 81401056 and 31040035) and a Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).

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Correspondence to Dianshuai Gao.

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Electronic Supplementary Material

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Supplement 1

Sequencing results of shRNA targeting NCAM. Four complementary shRNA oligonucleotides targeting the NCAM gene were designed, synthesized, and inserted into a linearized LV3 vector. The recombinant NCAM shRNA vectors were identified by DNA sequencing. The sequencing results confirmed successful shRNA sequence insertion into the vectors. (RAR 477 kb)

Supplement 2

Sequencing results of recombinant NCAM-140 vector plasmid. The NCAM gene was amplified and subcloned into an LV5 vector, and successful NCAM recombinant vector construction was confirmed by DNA sequencing. (SQD 94 kb)

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Li, L., Chen, H., Wang, M. et al. NCAM-140 Translocation into Lipid Rafts Mediates the Neuroprotective Effects of GDNF. Mol Neurobiol 54, 2739–2751 (2017). https://doi.org/10.1007/s12035-016-9749-x

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  • DOI: https://doi.org/10.1007/s12035-016-9749-x

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