We found a match
Your institution may have rights to this item. Sign in to continue.
- Title
Photodynamic therapy of cottontail rabbit papillomavirus-induced papillomas in a severe combined immunodeficient mouse xenograft system.
- Authors
Lee, Richard G.; Vecchiotti, Mark A.; Heaphy, John; Panneerselvam, Ashok; Schluchter, Mark D.; Oleinick, Nancy L.; Lavertu, Pierre; Alagramam, Kumar N.; Arnold, James E.; Sprecher, Robert C.
- Abstract
Objectives/Hypothesis: To evaluate the efficacy of photodynamic therapy (PDT) with the phthalocyanine photosensitizer Pc 4 for treating an animal model of recurrent respiratory papillomatosis (RRP). Methods: Rabbit skin was grafted onto the dorsum of severe combined immunodeficient mice, two xenografts per animal. After the graft healed, it was inoculated with cottontail rabbit papillomavirus (CRPV). When papillomas developed, Pc 4 (0.6 or 1.0 mg/kg) was administered systemically, and 48 hours later, one papilloma of the two on each animal was exposed to 675-nm photoactivating light at either 100 or 150 J/cm2. In addition to the contralateral tumors, which received Pc 4 but no light, other controls included animals receiving light only or neither agent. Response was assessed by measuring papilloma size with a caliper. Some papillomas and residual skin were harvested for histological assessment. Results: For the lower-dose PDT regimens, papilloma growth rates were not significantly different from the controls. In contrast, 13 of 15 papillomas receiving the higher Pc 4 dose (1.0 mg/kg) and the higher light fluence (150 J/cm2) regressed completely and did not regrow within the observation period of up to 79 days. The response of these papillomas was significantly different from the controls ( P < .001). Histological analysis confirmed the absence of residual tumor following complete response and replacement with near-normal epithelium. Conclusions: Pc 4-PDT is highly effective in treating virally induced (CRPV) papillomas in a murine model of RRP, and thus warrants further study as a treatment for HPV-induced papillomas. Laryngoscope, 2010
- Subjects
PHOTODYNAMIC therapy; COTTONTAILS; PAPILLOMAVIRUS diseases; LABORATORY mice; XENOGRAFTS; PHTHALOCYANINES; DISEASE relapse; THERAPEUTICS
- Publication
Laryngoscope, 2010, Vol 120, Issue 3, p618
- ISSN
0023-852X
- Publication type
Article
- DOI
10.1002/lary.20709