Prostate-restricted replicative adenovirus expressing human endostatin-angiostatin fusion gene exhibiting dramatic antitumor efficacy

Xiong Li, You Hong Liu, Sang Jin Lee, Thomas Gardner, Meei Huey Jeng, Chinghai Kao

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

Purpose: Our previous studies coadministering a replication-deficient adenovirus expressing endostatin and angiostatin fusion gene (EndoAngio) and a prostate-restricted, replication-competent adenovirus (PRRA) showed dramatic antitumor efficacy. This study integrated EndoAngio with an improved PRRA vector to make a single antiangiogenic PRRA, thereby exerting a similarly dramatic antitumor effect with feasibility for future clinical trials. Experimental Design: We developed an antiangiogenic PRRA with structural improvements. The antitumor efficacy of EndoAngio-PRRA was evaluated in prostate-specific antigen/prostate-specific membrane antigen (PSA/PSMA)-positive, androgen-independent CWR22rv tumor models. The tumor vasculature and cell morphology were observed by dual-photon microscopy. The antiangiogenic effect of EndoAngio delivered by PRRA and the killing activity of EndoAngio-PRRA were evaluated in vitro. Virus-inactivated conditioned media from virus-infected PSA/PSMA-positive cells were tested for apoptosis induction in prostate cancer cells. Results: Our novel EndoAngio-PRRA is a strong antiangiogenic and antitumor agent. Nine of 10 CWR22rv tumors treated by EndoAngio-PRRA completely regressed, with 1 tumor remaining in a dormant status for 26 weeks after treatment. Dual-photon microscopy revealed that EndoAngio-PRRA not only inhibited the development of tumor vasculature but also induced apoptosis in tumor cells. Subsequent in vitro study indicated that EndoAngio-PRRA exhibited stronger tumor-specific killing activity than enhanced green fluorescent protein-PRRA, which expresses enhanced green fluorescent protein instead of EndoAngio. Virus-inactivated conditioned medium from EndoAngio-PRRA- infected PSA/PSMA-positive cells induced apoptosis in C4-2 and CWR22rv cells. Conclusions: EndoAngio-PRRA uniquely combines three distinct antitumor effects to eliminate androgen-independent prostate cancer: antiangiogenesis, viral oncolysis, and apoptosis. This novel antiangiogenic PRRA represents a powerful agent feasible for future clinical trials for prostate cancer therapy.

Original languageEnglish
Pages (from-to)291-299
Number of pages9
JournalClinical Cancer Research
Volume14
Issue number1
DOIs
StatePublished - Jan 1 2008

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Angiostatins
Endostatins
Human Adenoviruses
Gene Fusion
Adenoviridae
Prostate
Prostate-Specific Antigen
Neoplasms
Apoptosis
Prostatic Neoplasms
Conditioned Culture Medium
Viruses
Photons
Androgens
Microscopy
Clinical Trials

ASJC Scopus subject areas

  • Cancer Research
  • Oncology

Cite this

Prostate-restricted replicative adenovirus expressing human endostatin-angiostatin fusion gene exhibiting dramatic antitumor efficacy. / Li, Xiong; Liu, You Hong; Lee, Sang Jin; Gardner, Thomas; Jeng, Meei Huey; Kao, Chinghai.

In: Clinical Cancer Research, Vol. 14, No. 1, 01.01.2008, p. 291-299.

Research output: Contribution to journalArticle

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