Leukemia regression by vascular disruption and antiangiogenic therapy. Academic Article uri icon

Overview

abstract

  • Acute myelogenous leukemias (AMLs) and endothelial cells depend on each other for survival and proliferation. Monotherapy antivascular strategies such as targeting vascular endothelial growth factor (VEGF) has limited efficacy in treating AML. Thus, in search of a multitarget antivascular treatment strategy for AML, we tested a novel vascular disrupting agent, OXi4503, alone and in combination with the anti-VEGF antibody, bevacizumab. Using xenotransplant animal models, OXi4503 treatment of human AML chloromas led to vascular disruption in leukemia cores that displayed increased leukemia cell apoptosis. However, viable rims of leukemia cells remained and were richly vascular with increased VEGF-A expression. To target this peripheral reactive angiogenesis, bevacizumab was combined with OXi4503 and abrogated viable vascular rims, thereby leading to enhanced leukemia regression. In a systemic model of primary human AML, OXi4503 regressed leukemia engraftment alone and in combination with bevacizumab. Differences in blood vessel density alone could not account for the observed regression, suggesting that OXi4503 also exhibited direct cytotoxic effects on leukemia cells. In vitro analyses confirmed this targeted effect, which was mediated by the production of reactive oxygen species and resulted in apoptosis. Together, these data show that OXi4503 alone is capable of regressing AML by a multitargeted mechanism and that the addition of bevacizumab mitigates reactive angiogenesis.

publication date

  • May 14, 2010

Research

keywords

  • Angiogenesis Inhibitors
  • Antibodies, Monoclonal
  • Diphosphates
  • Leukemia, Myeloid, Acute
  • Neovascularization, Pathologic
  • Sarcoma, Myeloid
  • Stilbenes

Identity

PubMed Central ID

  • PMC2938842

Scopus Document Identifier

  • 77956324472

Digital Object Identifier (DOI)

  • 10.1182/blood-2009-06-230474

PubMed ID

  • 20472832

Additional Document Info

volume

  • 116

issue

  • 9