A melanophore-based screening assay for erythropoietin receptors

Michael D. Carrithers, Louis A. Marotti, Akihiko Yoshimura, Michael R. Lerner

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

A rapid, functional assay in frog melanophore cells for the erythropoietin receptor (EPOR), a member of the cytokine receptor family, is demonstrated. A chimeric receptor that comprised the extracellular portion of the murine EPOR and the transmembrane and intracellular domains of the human epidermal growth factor receptor (EGFR) was subcloned into the expression vector pJG3.6. When the full-length EGFR was expressed in melanophores, EGF but not EPO mediated pigment dispersion in a time- and dose-dependent manner with an EC50 of 12.6 ± 2.9 pM. However, when the chimeric EPOR/EGFR was expressed, EPO but not EGF stimulated pigment dispersion in a time- and dose- dependent manner with an EC50 of 380 ± 107 pM. Neither EGF nor EPO had any effect on pigment dispersion in wild-type melanophores. EGF- and EPO-mediated pigment dispersion was blocked by the bisindolylmaleimide protein kinase C inhibitor Ro 31-8220. This study extends the use of the melanophore-based bioassay to include cytokine receptors in addition to G protein- and tyrosine kinase-coupled receptors. It represents a potentially powerful method for screening of combinatorial libraries to identify novel small molecule agonists and antagonists to this clinically important class of binding sites as well as performing studies of functional ligand-receptor interactions.

Original languageEnglish
Pages (from-to)9-14
Number of pages6
JournalJournal of Biomolecular Screening
Volume4
Issue number1
DOIs
Publication statusPublished - 1999
Externally publishedYes

Fingerprint

Melanophores
Erythropoietin Receptors
Epidermal Growth Factor
Pigments
Assays
Screening
Epidermal Growth Factor Receptor
Cytokine Receptors
Dosimetry
Protein C Inhibitor
Bioassay
Receptor Protein-Tyrosine Kinases
Protein Kinase Inhibitors
GTP-Binding Proteins
Biological Assay
Anura
Protein-Tyrosine Kinases
Protein Kinase C
Binding Sites
Ligands

ASJC Scopus subject areas

  • Analytical Chemistry
  • Clinical Biochemistry
  • Biotechnology

Cite this

A melanophore-based screening assay for erythropoietin receptors. / Carrithers, Michael D.; Marotti, Louis A.; Yoshimura, Akihiko; Lerner, Michael R.

In: Journal of Biomolecular Screening, Vol. 4, No. 1, 1999, p. 9-14.

Research output: Contribution to journalArticle

Carrithers, Michael D. ; Marotti, Louis A. ; Yoshimura, Akihiko ; Lerner, Michael R. / A melanophore-based screening assay for erythropoietin receptors. In: Journal of Biomolecular Screening. 1999 ; Vol. 4, No. 1. pp. 9-14.
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