Differential Effects of Combined Ad5- Delta 24RGD and Radiation Therapy in In vitro versus In vivo Models of Malignant Glioma -- Lamfers et al. 13 (24): 7451 -- Clinical Cancer Research
Lamfers, Branch of Neurosurgery, Erasmus University Medical Center, P.O. Box 2040, 3000 CA Rotterdam, the Netherlands. Purpose: The integrin-targeted conditionally replicating adenovirus Ad5- 24RGD has been shown to seize active oncolytic bustle in experimental tumors and is currently lifetime developed toward folio I clinical research for ovarian cancer and malignant glioma.
Previously, we reported that combination therapy of Ad5- 24RGD with irradiation led to synergistic antitumor existence in s.c. In the happening study, the underlying mechanism of agility to this synergy was studied and the stuff of combined therapy were assessed in an orthotopic glioma model. Experimental Chart and Results: Sequencing studies in U-87 monolayers showed that delivery of irradiation before Ad5- 24RGD infection led to a bigger oncolytic backwash than simultaneous delivery or infection before irradiation.
This backlash was not due to enhanced virus industry or release. Experiments using a luciferase-encoding vector revealed a baby access in transgene word in irradiated cells. In tumour spheroids, combination therapy was augmented competent than Ad5- 24RGD or irradiation alone. Staining of spheroid sections showed improved penetration of virus to the core of irradiated spheroids.
Mice bearing intracranial tumors received a combination of Ad5- 24RGD with 1 x 5 Gy complete oppose irradiation or with 2 x 6 Gy complete brain irradiation. In contrast to the in vitro news and reported results in s.c. Ad5- 24RGD.
Conclusions: Combined treatment with Ad5- 24RGD and irradiation shows enhanced antitumor being in vitro and in s.c. These differential results underscore the importance of the selected tumor example in assessing the thing of combination therapies with oncolytic adenoviruses.
