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Galectin-3 mediates post-ischemic tissue remodeling.

Yi-Ping Yan1, Bradley T Lang, Raghu Vemuganti

  • 1Department of Neurological Surgery, University of Wisconsin-Madison, 600 Highland Ave. Madison, WI 53792, USA.

Brain Research
|July 4, 2009
PubMed
Summary
This summary is machine-generated.

Galectin-3 (Gal-3) expression increases in the ischemic brain after stroke, promoting blood vessel growth and neural progenitor proliferation. Blocking Gal-3 activity may aid in stroke recovery and tissue remodeling.

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Area of Science:

  • Neuroscience
  • Immunology
  • Cell Biology

Background:

  • Galectin-3 (Gal-3) is a protein involved in cell proliferation, angiogenesis, and differentiation.
  • Stroke leads to complex cellular responses in the brain, including inflammation and cell death.

Purpose of the Study:

  • To investigate the role of Galectin-3 (Gal-3) in the ischemic brain following middle cerebral artery occlusion.
  • To determine the cellular sources and functional impact of Gal-3 in post-stroke tissue remodeling.

Main Methods:

  • Transient middle cerebral artery occlusion (tMCAO) in rats to induce focal cerebral ischemia.
  • Immunohistochemistry and double staining to detect Gal-3 expression and co-localization with specific cell markers (OX-42, GFAP, ED1).
  • In vitro cell culture assays to assess Gal-3 effects on endothelial cells and neural progenitors.
  • In vivo blockade of Gal-3 activity using neutralizing antibodies.

Main Results:

  • Gal-3 expression was significantly upregulated in the ischemic striatum of rats, increasing from day 1 to a peak at day 7 and persisting for at least 2 months post-reperfusion.
  • Gal-3 was primarily localized in activated microglia/infiltrating macrophages (OX-42+, ED1+) and activated astrocytes (GFAP+) in the ischemic brain.
  • In vitro, Gal-3 dose-dependently stimulated endothelial cell and neural progenitor proliferation.
  • Blockade of Gal-3 activity reduced ischemia-induced angiogenesis and neural progenitor proliferation in vivo.

Conclusions:

  • Activated microglia/macrophages and astrocytes are key sources of Gal-3 in the ischemic brain following stroke.
  • Gal-3 plays a crucial role in post-ischemic tissue remodeling by promoting angiogenesis and neurogenesis.
  • Targeting Gal-3 may represent a therapeutic strategy for stroke recovery.