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Related Experiment Videos

Insulin/FGF-binding ciliary membrane glycoprotein from Tetrahymena.

V Leick1, T C Bøg-Hansen, H A Juhl

  • 1Institute of Medical Biochemistry and Genetics Biochemistry Laboratory, Department B, University of Copenhagen, The Panum Institute, DK-2200 Copenhagen N, Denmark.

The Journal of Membrane Biology
|May 2, 2001
PubMed
Summary

Researchers identified a 66 kDa glycoprotein in Tetrahymena thermophila cilia that binds to insulin, fibroblast growth factor (FGF), and platelet-derived growth factor (PDGF) receptors, suggesting a role in peptide-mediated cell signaling.

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A quantitative assay for measurement of chemokinesis in Tetrahymena.

Methods in molecular biology (Clifton, N.J.)·2001

Area of Science:

  • Cell biology
  • Molecular biology
  • Biochemistry

Background:

  • Cilia are crucial for cellular functions, including motility and sensing.
  • Protozoa like Tetrahymena thermophila serve as model organisms for studying fundamental biological processes.
  • Peptide growth factors (e.g., FGF, insulin, PDGF) play vital roles in cell signaling pathways.

Purpose of the Study:

  • To identify and characterize ciliary membrane proteins in Tetrahymena thermophila involved in peptide signaling.
  • To investigate potential interactions between ciliary proteins and receptors for fibroblast growth factor (FGF), insulin, and platelet-derived growth factor (PDGF).

Main Methods:

  • Fractionation of ciliary membrane proteins using affinity chromatography with FGF, insulin, and concanavalin A (ConA).

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  • Analysis of eluted proteins by SDS-PAGE, isoelectric focusing, and Western immunoblotting.
  • Utilized antibodies against human insulin receptor beta-subunit, PDGF receptor (PDGFR), and bovine FGF receptor (FGFR).

    • Main Results:

    • A 66 kDa protein fraction was consistently eluted by FGF, insulin, and ConA affinity columns.
    • This 66 kDa fraction cross-reacted with antibodies against insulin receptor beta-subunit, PDGFR, and FGFR.
    • SDS-PAGE indicated a single component, though silver staining suggested minor variations, possibly isoforms or artifacts.

    Conclusions:

    • A 66 kDa glycoprotein in Tetrahymena cilia exhibits binding affinities for multiple peptide receptors.
    • This protein may function as a key mediator in peptide-mediated cell signaling pathways within the organism.
    • Further research is warranted to elucidate the precise function and structural characteristics of this multifunctional glycoprotein.