Schedule-dependence of C-CAM1 adenovirus gene therapy in a prostate cancer model
Journal
Anticancer Research
Journal Volume
19
Journal Issue
1A
Pages
337-340
Date Issued
1999
Author(s)
Abstract
Background: C-CAM1 functions as a tumor suppressor in prostate cancer. Thus C-CAM1 recombinant adenovirus therapy mat be a promising treatment for prostate cancer. Understanding the time course of C-CAM1's antitumor activity is essential for designing an optimal schedule for C-CAM1 gene therapy. Materials and methods: PC3 cells were exposed to Ad-C-CAM1 and the time course of C-CAM1 expression was monitored by flow cytometry. Tumors generated in nude mice by subcutaneous injection of PC-3 cells were used for in vivo testing of C-CAM1's antitumor activity. Intratumoral injections of viruses (either Ad-C-CAM1 of Ad-β-gal) or buffer only (control) were performed according to two different schedules. Mice in Schedule A received a single injection, while mice in Schedule B received the same total amount of viruses in 3 equal doses at 2-week intervals. Results: After single exposure to Ad-C-CAM1, PC-3 cells expressed abundant C-CAM1 protein which reached the highest level on day 3 and persisted for up to 5 days. PC-3 tumors in nude mice exhibited 2 to 3-week lag in tumor growth curves after a single Ad-C-CAM1 injection. In contrast, 14 of the 18 tumors receiving 3 fractionated Ad-C-CAM1 injections regressed completely, while the other 4 tumors shrank to significantly smaller sizes. Conclusions: Sustained expression of C-CAM1 is required for optimal tumor suppression. The schedule-dependence of C-CAM's antitumor activity should be taken into account in optimizing gene therapy in clinical settings.
Subjects
Adenovirus; Cell adhesion molecule; Gene therapy; Prostatic neoplasms; Tumor suppressor
SDGs
Other Subjects
cell adhesion molecule; animal experiment; animal model; antineoplastic activity; article; cancer model; controlled study; flow cytometry; gene therapy; male; mouse; nonhuman; nude mouse; priority journal; prostate cancer; tumor suppressor gene; tumor volume; Adenosine Triphosphatases; Adenoviridae; Animals; Antigens, CD; Carcinoembryonic Antigen; Cell Adhesion Molecules; Gene Therapy; Glycoproteins; Humans; Male; Mice; Mice, Nude; Prostatic Neoplasms; Tumor Cells, Cultured
Type
journal article