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Related Experiment Videos

Galectin-3 stimulates cell proliferation

H Inohara1, S Akahani, A Raz

  • 1Karmanos Cancer Institute, Wayne State University, Detroit, Michigan, 48201, USA. hide@ent.med.osaka-u.ac.jp

Experimental Cell Research
|December 16, 1998
PubMed
Summary
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Galectin-3 acts as a mitogen, stimulating fibroblast DNA synthesis and proliferation. This effect depends on its carbohydrate-binding ability and interaction with specific cell surface glycoproteins, suggesting a role in tissue remodeling.

Area of Science:

  • Biochemistry
  • Cell Biology
  • Molecular Biology

Background:

  • Galectin-3 is a beta-galactoside-binding protein implicated in various biological processes.
  • Its precise role in cell proliferation and interaction with cellular ligands requires further elucidation.

Purpose of the Study:

  • To investigate galectin-3's potential as a mitogen.
  • To identify the mechanisms and cellular targets involved in galectin-3-mediated cell growth.

Main Methods:

  • Incubation of quiescent human lung fibroblast (IMR-90) cells with recombinant galectin-3 (rGalectin-3).
  • Assays for DNA synthesis and cell proliferation.
  • Inhibition studies using lactose.
  • Chemical cross-linking and affinity purification to identify binding partners.

Related Experiment Videos

  • Pulse-chase analysis to assess secretion.

    • Main Results:

    • Recombinant galectin-3 significantly stimulated DNA synthesis and cell proliferation in IMR-90 cells in a dose-dependent manner.
    • The mitogenic activity was inhibited by lactose, confirming its dependence on galectin-3's lectin properties.
    • rGalectin-3 bound to cell surface glycoproteins distinct from LAMPs.
    • Galectin-3 was not secreted by IMR-90 cells.

    Conclusions:

    • Galectin-3 functions as a mitogen, promoting fibroblast proliferation via paracrine signaling.
    • Its interaction with specific cell surface glycoconjugates, not LAMPs, mediates this effect.
    • Galectin-3 may play a role in tissue remodeling processes.