title: Unfulfilled promise of endostatin in a gene therapy-xenotransplant model of human acute lymphocytic leukemia.
abstract: Retroviral transduction of hematopoietic stem cells (HSCs) offers an attractive strategy for treating malignancies that home to the marrow. This approach should therefore be of interest for evaluating the therapeutic activity of anti-angiogenic agents on hematopoietic malignancies whose growth has been associated with enhanced angiogenesis. A variety of studies have indicated endostatin to be a potent anti-angiogenic agent both in vitro and in vivo, and a human malignancy that might be sensitive to endostatin is human B-lineage acute lymphoblastic leukemia (B-ALL). The demonstrated ability of human B-ALL cells to engraft the marrow of immunodeficient mice suggested the potential of this system for testing an endostatin delivery strategy using co-transplanted non-obese diabetic-scid/scid (NOD/SCID) HSCs engineered to express endostatin. Here we show that, in spite of their mutant scid gene, NOD/SCID HSCs can be transduced with an endostatin-encoding retrovirus at efficiencies that result in a several-fold increase in endostatin serum levels in transplanted recipients. However, this did not alter the regrowth of co-transplanted human B-ALL blasts. These findings validate this gene transfer approach for investigating effects of novel therapeutics on primary human malignant cells that engraft NOD/SCID mice and question the utility of native endostatin for controlling human B-ALL in vivo.
authors.affiliation: Terry Fox Laboratory, British Columbia Cancer Agency, Vancouver, BC, V5Z 1L3, Canada.
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Eisterer
authors.forename: Xiaoyan
authors.initials: X
authors.lastname: Jiang
authors.forename: Thomas
authors.initials: T
authors.lastname: Bachelot
authors.forename: Robert
authors.initials: R
authors.lastname: Pawliuk
authors.forename: Carolina
authors.initials: C
authors.lastname: Abramovich
authors.forename: Philippe
authors.initials: P
authors.lastname: Leboulch
authors.forename: Donna
authors.initials: D
authors.lastname: Hogge
authors.forename: Connie
authors.initials: C
authors.lastname: Eaves
mesh_terms: D020533:Angiogenesis Inhibitors / Q000235:genetics / Q000627:therapeutic use; D000818:Animals; D003094:Collagen / Q000235:genetics* / Q000627:therapeutic use; D004195:Disease Models, Animal; D043169:Endostatins; D018014:Gene Transfer Techniques; D015316:Genetic Therapy; D005822:Genetic Vectors; D018380:Hematopoietic Stem Cell Transplantation; D006801:Humans; D051379:Mice; D016688:Mice, Inbred NOD; D016513:Mice, SCID; D009368:Neoplasm Transplantation; D010446:Peptide Fragments / Q000235:genetics* / Q000627:therapeutic use; D054198:Precursor Cell Lymphoblastic Leukemia-Lymphoma / Q000532:radiotherapy / Q000628:therapy*; D012190:Retroviridae / Q000235:genetics; D014183:Transplantation, Heterologous; D014407:Tumor Cells, Cultured
chemical_list: D020533:Angiogenesis Inhibitors; D043169:Endostatins; D010446:Peptide Fragments; D003094:Collagen