Detection of receptor trimers on the cell surface by flow cytometric fluorescence energy homotransfer measurements

L. Bene, J. Szöllősi, Gergely Szentesi, László Damjanovich, R. Gáspár, Thomas A. Waldmann, S. Damjanovich

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Fluorescence energy homotransfer offers a powerful tool for the investigation of the state of oligomerization of cell surface receptors on a cell-by-cell basis by measuring the polarized components of fluorescence intensity of cells labeled with fluorescently stained antibodies. Here we describe homotransfer-based methods for the flow cytometric detection and analysis of hetero- and homo-associations of cell surface receptors. Homotransfer efficiencies for two- and three-body energy transfer interactions are defined and their frequency distribution curves are computed from the fluorescence anisotropy distributions of multiple-labeled cells. The fractions of receptors involved in homo-clustering is calculated based on the dependence of the fluorescence anisotropy on the surface concentration of the fluorescently stained antibodies. A homotransfer analysis of the homo- and hetero-clustering of the MHCI and MHCII glycoproteins, the cytokine receptor IL-2Rα, transferrin receptor and the receptor-type tyrosine phosphatase CD45 on JY B and Kit-225-K6 T cells is presented. We investigated how various factors such as the type of dye, rotational mobility of the dye and dye-targeting antibody, as well as the wavelength of the exciting light affect the homotransfer. We show that the homotransfer technique combined with the high statistical resolution of flow cytometry is an effective tool for detecting different oligomeric states of receptors by using fluorophores having restricted rotational mobility on the time scale of fluorescence.

Original languageEnglish
Pages (from-to)176-198
Number of pages23
JournalBiochimica et Biophysica Acta - Molecular Cell Research
Volume1744
Issue number2
DOIs
Publication statusPublished - Jun 30 2005

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Fluorescence
Cluster Analysis
Fluorescence Polarization
Coloring Agents
Cell Surface Receptors
Antibodies
Cytokine Receptors
Transferrin Receptors
Energy Transfer
Phosphoric Monoester Hydrolases
Glycoproteins
Flow Cytometry
T-Lymphocytes
Light

Keywords

  • CD45
  • Fluorescence anisotropy
  • IL-2Rα
  • MHCI and MHCII glycoprotein
  • Receptor clustering
  • Transferrin receptor

ASJC Scopus subject areas

  • Cell Biology
  • Molecular Biology
  • Biophysics

Cite this

Detection of receptor trimers on the cell surface by flow cytometric fluorescence energy homotransfer measurements. / Bene, L.; Szöllősi, J.; Szentesi, Gergely; Damjanovich, László; Gáspár, R.; Waldmann, Thomas A.; Damjanovich, S.

In: Biochimica et Biophysica Acta - Molecular Cell Research, Vol. 1744, No. 2, 30.06.2005, p. 176-198.

Research output: Contribution to journalArticle

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