Enhancement of cisplatin sensitivity in Lewis Lung carcinoma by liposome-mediated delivery of a survivin mutant.

Abstract:

BACKGROUND:A high concentration of cisplatin (CDDP) induces apoptosis in many tumor cell lines. CDDP has been administered by infusion to avoid severe toxicity. Recently, it has been reported that changes in survivin expression or function may lead to tumor sensitization to chemical and physical agents. The aim of this study was to determine whether a dominant-negative mouse survivin mutant could enhance the anti-tumor activity of CDDP. METHODS:A plasmid encoding the phosphorylation-defective dominant-negative mouse survivin threonine 34-->alanine mutant (survivin T34A) complexed to a DOTAP-chol liposome (Lip-mS) was administered with or without CDDP in Lewis Lung Carcinoma (LLC) cells and in mice bearing LLC tumors, and the effects on apoptosis, tumor growth and angiogenesis were assessed. Data were analyzed using one-way analysis of variance(ANOVA), and a value of P < 0.05 was considered to be statistically significant. RESULTS:LLC cells treated with a combination of Lip-mS and CDDP displayed increased apoptosis compared with those treated with Lip-mS or CDDP alone. In mice bearing LLC tumors and treated with intravenous injections of Lip-mS and/or CDDP, combination treatment significantly reduced the mean tumor volume compared with either treatment alone. Moreover, the antitumor effect of Lip-mS combined with CDDP was greater than their anticipated additive effects. CONCLUSION:These data suggest that the dominant-negative survivin mutant, survivin T34A, sensitized LLC cells to chemotherapy of CDDP. The synergistic antitumor activity of the combination treatment may in part result from an increase in the apoptosis of tumor cells, inhibition of tumor angiogenesis and induction of a tumor-protective immune response.

journal_name

J Exp Clin Cancer Res

authors

Yu DD,Wang CT,Shi HS,Li ZY,Pan L,Yuan QZ,Leng F,Wen Y,Chen X,Wei YQ

doi

10.1186/1756-9966-29-46

subject

Has Abstract

pub_date

2010-05-12 00:00:00

pages

46

eissn

0392-9078

issn

1756-9966

pii

1756-9966-29-46

journal_volume

29

pub_type

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