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Application of long-circulating liposomes to cancer photodynamic therapy

TitleApplication of long-circulating liposomes to cancer photodynamic therapy
Publication TypeJournal Article
Year of Publication1997
AuthorsOku, N, Saito, N, Namba, Y, Tsukada, H, Dolphin, D, Okada, S
JournalBiological & Pharmaceutical Bulletin
Volume20
Pagination670-673
Date PublishedJun
Type of ArticleArticle
ISBN Number0918-6158
KeywordsBEARING MICE, benzoporphyrin, BENZOPORPHYRIN DERIVATIVES, BPD, CELLS, DERIVATIVE, drug delivery system, EFFICACY, INVIVO, LIPOPROTEINS, liposome, MURINE TUMOR-MODEL, PHOTODYNAMIC THERAPY, PHOTOSENSITIZER, time
Abstract

Photodynamic therapy (PDT) as a cancer treatment is notable for its quite low side effects in comparison with those of chemotherapy and radiotherapy. However, the accumulation of porphyrin derivatives used in PDT into tumor tissues is rather low. Since long-circulating liposomes are known to accumulate passively into tumor tissues, we liposomalized a porphyrin derivative, benzoporphyrin derivative monoacid ring A (BPD-MA), and used these liposomes to investigate the usefulness of PDT for tumor-bearing mice. BPD-MA was liposomalized into glucuronate-modified liposomes, which are known to be long-circulating. These liposomes were injected i.v. into Balb/c mice bearing Meth A sarcoma, and tumor regression and survival time were monitored after irradiation with laser light. Tumor regression and complete curing of tumor (80% cure rate by the treatment with 6 mg/kg BPD-R?IA) were observed when long circulating liposomalized BPD-MA was injected and laser-irradiated. In contrast, only a 20% cure rate was obtained when the animals were treated with BPD-MA solution or BPD-MA entrapped in conventional liposomes. These results suggest that a long-circulating liposomal formulation of photo-sensitive agents is useful for PDT.

URL<Go to ISI>://A1997XG54700016