PURPOSE: Patients with localized prostate cancer can usually achieve initial response to conventional treatment. However, most of them will inevitably progress to advanced disease stage. There is a clear need to develop innovative and effective therapeutics for prostate cancer. Mouse survivin T34A (mS-T34A) is a phosphorylation-defective Thr34 → Ala dominant negative mutant, which represents a potential promising target for cancer gene therapy. This study was designed to determine whether mS-T34A plasmid encapsuled by DOTAP-chol liposome (Lip-mS) has the anti-tumor activity against prostate cancer, if so, to further investigate the possible mechanisms. METHODS: In vitro, TRAMP-C1 cells were transfected with Lip-mS and examined for apoptosis by PI staining and flow cytometric analysis. In vivo, subcutaneous prostate cancer models were established in C57BL/6 mice, which were randomly assigned into three groups to receive i.v. administrations of Lip-mS, pVITRO2-null plasmid complexed with DOTAP-chol liposome (Lip-null) or normal saline every 2 days for eight doses. Tumor volume was measured. Tumor tissues were inspected for apoptosis by TUNEL assay. Microvessel density (MVD) was determined by CD31 immunohistochemistry. Alginate-encapsulated tumor cell test was conducted to evaluate the treatment effect on angiogenesis. RESULTS: Administration of Lip-mS resulted in significant inhibition in the growth of mouse TRAMP-C1 tumors. The anti-tumor response was associated with increased tumor cell apoptosis and decreased microvessel density. CONCLUSIONS: The present study may be of importance in the exploration of the potential application of Lip-mS in the treatment of a broad spectrum of tumors.
PURPOSE:Patients with localized prostate cancer can usually achieve initial response to conventional treatment. However, most of them will inevitably progress to advanced disease stage. There is a clear need to develop innovative and effective therapeutics for prostate cancer. MousesurvivinT34A (mS-T34A) is a phosphorylation-defective Thr34 → Ala dominant negative mutant, which represents a potential promising target for cancer gene therapy. This study was designed to determine whether mS-T34A plasmid encapsuled by DOTAP-chol liposome (Lip-mS) has the anti-tumor activity against prostate cancer, if so, to further investigate the possible mechanisms. METHODS: In vitro, TRAMP-C1 cells were transfected with Lip-mS and examined for apoptosis by PI staining and flow cytometric analysis. In vivo, subcutaneous prostate cancer models were established in C57BL/6 mice, which were randomly assigned into three groups to receive i.v. administrations of Lip-mS, pVITRO2-null plasmid complexed with DOTAP-chol liposome (Lip-null) or normal saline every 2 days for eight doses. Tumor volume was measured. Tumor tissues were inspected for apoptosis by TUNEL assay. Microvessel density (MVD) was determined by CD31 immunohistochemistry. Alginate-encapsulated tumor cell test was conducted to evaluate the treatment effect on angiogenesis. RESULTS: Administration of Lip-mS resulted in significant inhibition in the growth of mouseTRAMP-C1 tumors. The anti-tumor response was associated with increased tumor cell apoptosis and decreased microvessel density. CONCLUSIONS: The present study may be of importance in the exploration of the potential application of Lip-mS in the treatment of a broad spectrum of tumors.
Authors: J Dixelius; H Larsson; T Sasaki; K Holmqvist; L Lu; A Engström; R Timpl; M Welsh; L Claesson-Welsh Journal: Blood Date: 2000-06-01 Impact factor: 22.113
Authors: G Batist; G Ramakrishnan; C S Rao; A Chandrasekharan; J Gutheil; T Guthrie; P Shah; A Khojasteh; M K Nair; K Hoelzer; K Tkaczuk; Y C Park; L W Lee Journal: J Clin Oncol Date: 2001-03-01 Impact factor: 44.544
Authors: William K Decker; Jianxia Qiu; Farhang Farhangfar; Jenny H Hester; Dario C Altieri; Augustine Y Lin Journal: Cancer Lett Date: 2005-07-12 Impact factor: 8.679