Newer options for treating drug-resistant (MDR+) cancer cells using photoradiation therapy.

Abstract

Emergence of drug resistance with conventional cytotoxic therapy is a major challenge towards the curability of many cancers, especially in patients undergoing autologous BMT with ex-vivo purged hematopoietic support. We have explored the potential role of photoradiation therapy in purging hematopoietic stem cells of various hematological malignancies. Benzoporphyrin derivative, monoacid ring A (BPD-MA), dihematoporphyrin ether (DHE), and MC-540 were evaluated for the "ex-vivo" purging of residual tumor cells from autologous bone marrow (BM) grafts. BPD-MA and DHE photosensitizing activity was tested against two human large cell lymphoma cell lines and colony forming-unit leukemia (CFU-L) derived from patients with acute myelogenous leukemia (AML). In mixing experiments four log elimination of tumor cell lines was observed after 1 hr of incubation with BPD-MA or DHE followed by white light exposure. By comparison, using the same concentration of BPD-MA or DHE, the mean recovery of normal BM progenitors was 4-5.2% for granulocyte-macrophage colony forming unit (CFU-GM) and 5-9.8% for burst forming unit erythroid (BFU-E). The T lymphoblastic leukemia cell line CEM and its vinblastine (VBL)-resistant subline CEM/VBL100, along with the acute promyelocyte leukemia cell line HL-60 and its vincristine (VCR)-resistant subline HL-60/VCR, were also tested. Our results demonstrated the preferential cytotoxicity of BPD-MA and DHE toward neoplastic cell lines and CFU-L from AML patients. In addition, DHE was slightly more effective in purging tumor cells expressing the p-170 glycoprotein.(ABSTRACT TRUNCATED AT 250 WORDS)

• Authors: S C Gulati, R M Lemoli, T Igarashi, J Atzpodien
• Journal: Leukemia & lymphoma (Leuk Lymphoma) Vol. 12 Issue 5-6 Pg. 427-33 (Feb 1994) ISSN: 1042-8194 [Print] United States
• PMID: 8180606 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Topics

• Bone Marrow Purging
• Bone Marrow Transplantation
• Drug Resistance
• Hematopoietic Stem Cells
• Humans
• Leukemia (therapy)
• Lymphoma (therapy)
• Phototherapy
• Tumor Cells, Cultured