Enhancement of adenovirus delivery after ultrasound-stimulated therapy in a cancer model.
Improving the efficiency of adenovirus (Ad) delivery to target tissues has the potential to advance the translation of cancer gene therapy. Ultrasound (US)-stimulated therapy uses microbubbles (MBs) exposed to low-intensity US energy to improve localized delivery. We hypothesize that US-stimulated gene therapy can improve Ad infection in a primary prostate tumor through enhanced tumor uptake and retention of the Ad vector. In vitro studies were performed to analyze the degree of Ad infectivity after application of US-stimulated gene therapy. A luciferase-based Ad on a ubiquitous cytomegalovirus (CMV) promoter (Ad5/3-CMV-Luc) was used in an animal model of prostate cancer (bilateral tumor growth) to evaluate Ad transduction efficiency after US-stimulated therapy. Bioluminescence imaging was employed for in vivo analysis to quantify Ad infection within the tumor. In vitro studies revealed no difference in Ad transduction between groups receiving US-stimulated therapy using high, low or sham US intensity exposures at various multiplicities of infection (MOIs) (p = 0.80). In vivo results indicated that tumors receiving US-stimulated therapy after intra-tumoral injection of Ad5/3-CMV-Luc (1 × 10(6) plaque-forming units) exhibited a 95.1% enhancement in tumor delivery compared with control tumors receiving sham US (p = 0.03). US-stimulated therapy has significant potential to immediately affect Ad-based cancer gene therapy by improving virus bioavailability in target tissues.
Department of Biomedical Engineering, University of Alabama at Birmingham, Birmingham, Alabama, USA.
Anna G
AG
Sorace
Jason M
JM
Warram
Marshall
M
Mahoney
Kurt R
KR
Zinn
Kenneth
K
Hoyt
D000256:Adenoviridae / Q000235:genetics*; D000818:Animals; D045744:Cell Line, Tumor; D018274:Electroporation / Q000379:methods*; D019220:High-Energy Shock Waves; D006801:Humans; D008297:Male; D051379:Mice; D008819:Mice, Nude; D011471:Prostatic Neoplasms / Q000235:genetics / Q000628:therapy / Q000821:virology; D013010:Sonication / Q000379:methods*; D014162:Transfection / Q000379:methods*; D016896:Treatment Outcome
Adenovirus; Cancer; Gene therapy; Microbubble contrast agent; Transduction; Ultrasound