title: Sirt2 suppresses glioma cell growth through targeting NF-κB-miR-21 axis.
abstract: Sirtuins are NAD(+)-dependent deacetylases that regulate numerous cellular processes including aging, DNA repair, cell cycle, metabolism, and survival under stress conditions. The roles of sirtuin family members are widely studied in carcinogenesis. However, their roles in glioma remain unclear. Here we report that Sir2 was under expressed in human glioma tissues and cell lines. We found that Sirt2 overexpression decreased cell proliferation and colony formation capacity. In addition, Sirt2 overexpression induced cellular apoptosis via up-regulating cleaved caspase 3 and Bax, and down-regulating anti-apoptotic protein Bcl-2. Sirt2 knockdown obtained opposing results. We showed that Sirt2 overexpression inhibited miR-21 expression, and Sirt2 was not sufficient to reduce cell proliferation and colony formation as well as to induce apoptosis when miR-21 was knocked down in glioma cells. Mechanically, we demonstrated that Sirt2 deacetylated p65 at K310 and blocked p65 binding to the promoter region of miR-21, thus regressing the transcription of miR-21. In summary, Sirt2 is critical in human glioma via NF-κB-miR-21 pathway and Sirt2 activator may serve as candidate drug for glioma therapy.
authors.affiliation: Department of Neurosurgery, Changhai Hospital, Second Military Medical University, Shanghai, China.
authors.forename: Ya'nan
authors.initials: Y
authors.lastname: Li
authors.forename: Dongwei
authors.initials: D
authors.lastname: Dai
authors.forename: Qiong
authors.initials: Q
authors.lastname: Lu
authors.forename: Mingyu
authors.initials: M
authors.lastname: Fei
authors.forename: Mengmeng
authors.initials: M
authors.lastname: Li
authors.forename: Xi
authors.initials: X
authors.lastname: Wu
mesh_terms: D017209:Apoptosis; D001932:Brain Neoplasms / Q000201:enzymology* / Q000235:genetics / Q000473:pathology*; D053148:Caspase 3 / Q000378:metabolism; D045744:Cell Line, Tumor; D049109:Cell Proliferation; D015536:Down-Regulation; D055785:Gene Knockdown Techniques; D005910:Glioma / Q000201:enzymology* / Q000235:genetics / Q000473:pathology*; D006801:Humans; D035683:MicroRNAs / Q000235:genetics / Q000378:metabolism*; D016328:NF-kappa B / Q000378:metabolism*; D011401:Promoter Regions, Genetic; D056565:Sirtuin 2 / Q000235:genetics / Q000378:metabolism*; D051996:Transcription Factor RelA / Q000378:metabolism; D014158:Transcription, Genetic; D051028:bcl-2-Associated X Protein / Q000378:metabolism
chemical_list: C524940:MIRN21 microRNA, human; D035683:MicroRNAs; D016328:NF-kappa B; C498143:RELA protein, human; D051996:Transcription Factor RelA; D051028:bcl-2-Associated X Protein; D053148:Caspase 3; C474199:SIRT2 protein, human; D056565:Sirtuin 2
keywords: Apoptosis; Deacetylation; Glioma; NF-κB; Sirt2; miR-21