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Nanoformulated cell-penetrating survivin mutant and its dual actions

Authors Sriramoju B, Kanwar RK, Kanwar JR

Received 6 January 2014

Accepted for publication 15 February 2014

Published 10 July 2014 Volume 2014:9(1) Pages 3279—3298

DOI https://doi.org/10.2147/IJN.S60169

Checked for plagiarism Yes

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Bhasker Sriramoju, Rupinder K Kanwar, Jagat R Kanwar

Nanomedicine Laboratory of Immunology and Molecular Biomedical Research (NLIMBR), School of Medicine, Faculty of Health, Deakin University, Geelong, Australia

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.

Keywords: survivin mutant, neurological disorders, protein therapeutics, inhibitor of apoptosis protein family, poly(lactic-co-glycolic acid)

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