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| Content Provider | Royal Society of Chemistry (RSC) |
|---|---|
| Author | Bhuvaneswari, Ramaswamy Yuen, Gan Yik Chee, Soo Khee Olivo, Malini |
| Copyright Year | 2007 |
| Abstract | Photodynamic therapy (PDT) is a therapeutic modality in which a photosensitizer is locally or systemically administered followed by light irradiation of suitable wavelength to achieve selective tissue damage. In addition, PDT is an oxygen-consuming reaction, that causes hypoxia mediated destruction of tumor vasculature that results in effective treatment. However, the hypoxic condition within tumors can cause stress-related release of angiogenic growth factors and cytokines and this inflammatory response could possibly diminish the efficacy of PDT by promoting tumor regrowth. In such circumstances, PDT effectiveness can be enhanced by combining angiogenesis inhibitors into the treatment regimen. Avastin (bevacizumab), a vascular endothelial growth factor (VEGF) specific monoclonal antibody in combination with chemotherapy is offering hope to patients with metastatic colorectal cancer. In this study we evaluated the combination of hypericin-mediated PDT and Avastin on VEGF levels as well as its effect on overall tumor response. Experiments were conducted on bladder carcinoma xenografts established subcutaneously in Balb/c nude mice. Antibody array, enzyme-linked immunosorbent assay (ELISA) and immunohistochemistry (IHC) were performed to assess VEGF concentrations in the various treatment groups. Our results demonstrated that the targeted therapy by Avastin along with PDT can improve tumor responsiveness in bladder tumor xenografts. Immunostaining showed minimal expression of VEGF in tumors treated with combination therapy of PDT and Avastin. Angiogenic proteinse.g., angiogenin, basic fibroblastgrowth factor (bFGF), epidermal growth factor (EGF) and interleukins (IL-6 and IL-8) were also found to be downregulated in groups treated with combination therapy. |
| Starting Page | 1275 |
| Ending Page | 1283 |
| Page Count | 9 |
| File Format | HTM / HTML PDF |
| ISSN | 1474905X |
| Volume Number | 6 |
| Issue Number | 12 |
| Journal | Photochemical & Photobiological Sciences |
| DOI | 10.1039/b705763f |
| Language | English |
| Publisher | Royal Society of Chemistry |
| Access Restriction | Subscribed |
| Subject Keyword | Immunohistochemistry Photodynamic therapy Carcinoma EGF Targeted therapy Colorectal cancer Tumor hypoxia Basic fibroblast growth factor Monoclonal antibody Nude mouse Angiogenin Wavelength Bevacizumab Interleukin 6 Angiogenesis Chemotherapy Photosensitizer Vascular endothelial growth factor Interleukin 8 Growth factor ELISA |
| Content Type | Text |
| Resource Type | Article |
| Subject | Physical and Theoretical Chemistry |
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