Murine experimental autoimmune encephalomyelitis is diminished by treatment with the angiogenesis inhibitors B20-4.1.1 and angiostatin (K1-3)

PLoS One. 2014 Feb 26;9(2):e89770. doi: 10.1371/journal.pone.0089770. eCollection 2014.

Abstract

Angiogenesis is the formation of new blood vessels form pre-existing vasculature whose contribution to inflammatory conditions of the Central Nervous System is being studied in order to generate novel therapeutic targets. This study is the first to investigate the impact of two particular angiogenesis inhibitors on murine Experimental Autoimmune Encephalomyelitis (EAE), an inflammatory disease that mimics aspects of the human disease Multiple Sclerosis. The inhibitors were chosen to reduce angiogenesis by complimentary means. Extrinsic factors were targeted with B20-4.1.1 through its ability to bind to murine Vascular Endothelial Growth Factor (VEGF). Vascular processes connected to angiogenesis were targeted directly with K(1-3), the first three kringle domains of angiostatin. Mice treated with B20-4.1.1 and K(1-3) from onset of signs had reduced clinical scores 18-21 days after EAE induction. Both agents suppressed spinal cord angiogenesis without effect on local VEGF expression. B20-4.1.1 reduced spinal cord vascular permeability while K(1-3) had no effect. T cell infiltration into the spinal cord at day 21 was unaffected by either treatment. B20-4.1.1 reduced peripheral T cell proliferation while K(1-3) had no effect. Lymphoid cells from treated mice produced reduced levels of the T helper-17 (Th-17) cell cytokine interleukin (IL)-17 with no effect on the Th-1 cytokine interferon (IFN)-γ or Th-2 cytokine IL-4. However, when both drugs were added in vitro to naive T cells or to antigen stimulated T cells from mice with untreated EAE they had no effect on proliferation or levels of IL-17 or IFN-γ. We conclude that these angiogenesis inhibitors mitigate EAE by both suppressing spinal cord angiogenesis and reducing peripheral T cell activation.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Angiogenesis Inhibitors / pharmacology*
  • Angiogenesis Inhibitors / therapeutic use
  • Angiostatins
  • Animals
  • Capillary Permeability / drug effects
  • Encephalomyelitis, Autoimmune, Experimental / complications
  • Encephalomyelitis, Autoimmune, Experimental / drug therapy*
  • Immunohistochemistry
  • Lymphocyte Activation / drug effects
  • Mice
  • Neovascularization, Pathologic / drug therapy*
  • Neovascularization, Pathologic / etiology
  • Spinal Cord / blood supply
  • Spinal Cord / drug effects
  • T-Lymphocytes / drug effects
  • Vascular Endothelial Growth Factor A / metabolism

Substances

  • Angiogenesis Inhibitors
  • Vascular Endothelial Growth Factor A
  • Angiostatins

Grants and funding

1. Nova Scotia Health Research Foundation (Grant to AE); #MED-Project-2008-4642; http://www.nshrf.ca. 2. Capital Health Research Fund (Grant to AE): #1012329; http://www.cdha.nshealth.ca/discovery-innovation/research fund. 3. Natural Sciences and Engineering Research Council (Grant to DW); #89358; http://www.nserc-crsng.gc.ca. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.