title: Nanoformulated cell-penetrating survivin mutant and its dual actions.
abstract: In this study, we investigated the differential actions of a dominant-negative survivin mutant (SurR9-C84A) against cancerous SK-N-SH neuroblastoma cell lines and differentiated SK-N-SH neurons. In both the cases, the mutant protein displayed dual actions, where its effects were cytotoxic toward cancerous cells and proliferative toward the differentiated neurons. This can be explained by the fact that tumorous (undifferentiated SK-N-SH) cells have a high endogenous survivin pool and upon treatment with mutant SuR9-C84A causes forceful survivin expression. These events significantly lowered the microtubule dynamics and stability, eventually leading to apoptosis. In the case of differentiated SK-N-SH neurons that express negligible levels of wild-type survivin, the mutant indistinguishably behaved in a wild-type fashion. It also favored cell-cycle progression, forming the chromosome-passenger complex, and stabilized the microtubule-organizing center. Therefore, mutant SurR9-C84A represents a novel therapeutic with its dual actions (cytotoxic toward tumor cells and protective and proliferative toward neuronal cells), and hence finds potential applications against a variety of neurological disorders. In this study, we also developed a novel poly(lactic-co-glycolic acid) nanoparticulate formulation to surmount the hurdles associated with the delivery of SurR9-C84A, thus enhancing its effective therapeutic outcome.
authors.affiliation: Nanomedicine Laboratory of Immunology and Molecular Biomedical Research (NLIMBR), School of Medicine, Faculty of Health, Deakin University, Geelong, Australia.
authors.forename: Bhasker
authors.initials: B
authors.lastname: Sriramoju
authors.affiliation: Nanomedicine Laboratory of Immunology and Molecular Biomedical Research (NLIMBR), School of Medicine, Faculty of Health, Deakin University, Geelong, Australia.
authors.forename: Rupinder K
authors.initials: RK
authors.lastname: Kanwar
authors.affiliation: Nanomedicine Laboratory of Immunology and Molecular Biomedical Research (NLIMBR), School of Medicine, Faculty of Health, Deakin University, Geelong, Australia.
authors.forename: Jagat R
authors.initials: JR
authors.lastname: Kanwar
mesh_terms: D000818:Animals; D000970:Antineoplastic Agents / Q000737:chemistry* / Q000494:pharmacology / Q000633:toxicity; D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000187:drug effects; D006801:Humans; D051034:Inhibitor of Apoptosis Proteins / Q000737:chemistry* / Q000494:pharmacology / Q000633:toxicity; D051379:Mice; D009154:Mutation; D053758:Nanoparticles / Q000737:chemistry* / Q000633:toxicity; D012097:Repressor Proteins / Q000737:chemistry* / Q000494:pharmacology / Q000633:toxicity; D000077022:Survivin
chemical_list: D000970:Antineoplastic Agents; C117749:Birc5 protein, mouse; D051034:Inhibitor of Apoptosis Proteins; D012097:Repressor Proteins; D000077022:Survivin
keywords: inhibitor of apoptosis protein family; neurological disorders; poly(lactic-co-glycolic acid); protein therapeutics; survivin mutant