title: Dual chemotherapy and photodynamic therapy in an HT-29 human colon cancer xenograft model using SN-38-loaded chlorin-core star block copolymer micelles.
abstract: Chlorin-core star-shaped block copolymer (CSBC) may self-assemble to form micelles, which act as nanosized photosensitizing agents for photodynamic therapy (PDT) and further encapsulate hydrophobic drugs. This functionalized micellar delivery system is a potential dual carrier for the synergistic combination of photodynamic therapy and chemotherapy for the treatment of cancer. In this study, SN-38 encapsulated CSBC micelles were successfully prepared using a lyophilization-hydration method. Our results show that the prolonged plasma residence time of SN-38/CSBC micelles as compared with free CPT-11 permit increased tumor accumulation and consequently, improved antitumor activity. The combined effects of SN-38/CSBC micelles with PDT were evaluated in an HT-29 human colon cancer xenograft model. Interesting, SN-38/CSBC-mediated PDT synergistically inhibited tumor growth, resulting in up to 60% complete regression of well-established tumors after 3 treatments. These treatments also decreased the microvessel density (MVD) and cell proliferation within the subcutaneous tumors. Therefore, this SN-38/CBSC delivery system has the potential to offer dual therapies for the synergistic combination of PDT and chemotherapy for the treatment of cancer.
authors.affiliation: Institute of Biomedical Engineering, College of Medicine and College of Engineering, National Taiwan University, No. 1, Section 1, Jen-Ai Road, Taipei 100, Taiwan.
authors.forename: Cheng-Liang
authors.initials: CL
authors.lastname: Peng
authors.forename: Ping-Shan
authors.initials: PS
authors.lastname: Lai
authors.forename: Feng-Huei
authors.initials: FH
authors.lastname: Lin
authors.forename: Steven
authors.initials: S
authors.lastname: Yueh-Hsiu Wu
authors.forename: Ming-Jium
authors.initials: MJ
authors.lastname: Shieh
mesh_terms: D000818:Animals; D000972:Antineoplastic Agents, Phytogenic / Q000737:chemistry / Q000494:pharmacology* / Q000627:therapeutic use; D002166:Camptothecin / Q000031:analogs & derivatives* / Q000737:chemistry / Q000493:pharmacokinetics / Q000494:pharmacology / Q000627:therapeutic use; D045744:Cell Line, Tumor; D002470:Cell Survival / Q000187:drug effects; D003110:Colonic Neoplasms / Q000188:drug therapy; D005260:Female; D019073:HT29 Cells; D006801:Humans; D007150:Immunohistochemistry; D000077146:Irinotecan; D051379:Mice; D008807:Mice, Inbred BALB C; D008823:Micelles; D015394:Molecular Structure; D010778:Photochemotherapy / Q000379:methods*; D011108:Polymers / Q000737:chemistry*; D011166:Porphyrins / Q000737:chemistry*; D023041:Xenograft Model Antitumor Assays
chemical_list: D000972:Antineoplastic Agents, Phytogenic; D008823:Micelles; D011108:Polymers; D011166:Porphyrins; C006969:chlorin; D000077146:Irinotecan; D002166:Camptothecin