Epidermal growth factor activates extracellular signal-regulated protein kinases (ERK) in freshly isolated porcine granulosa cells

Brooks Allen Keel, John S. Davis

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

We investigated the ability of EGF to stimulate the phosphorylation (i.e. activation) of extracellular signal-regulated kinases (ERKs) in freshly isolated porcine granulosa cells (pGC) held in suspension. pGCs were isolated from the ovaries of prepubertal pigs at slaughter, and equilibrated for 24 h at 37°C in 12 x 75 mm culture tubes. The cells were then treated with 0-10 ng/ml EGF for 1-240 min. Treatments were terminated, and the total cell lysates were subjected to SDS-PAGE and Western analysis. The Westerns were blotted with anti-panERK and with anti-phosphoERK, antibodies that recognize all forms of ERKs and the phosphorylated (i.e. activated) forms of ERKs, respectively. Western blot analysis with the panERK antibody revealed a gel shift of ERKs, suggesting hyperphosphorylation after treatment with as little as 0.1 ng/ml of EGF. Phosphorylation of the ERKs was confirmed by using the phosphoERK antibody, which indicated increased phosphorylation of ERKs above control with 0.1 ng/ml EGF and maximal phosphorylation of ERK with 5-10 ng/ml EGF. Activation of ERK by EGF, as measured by both gel shift analysis and active ERK blotting, in the freshly isolated pGC was rapid, increasing above controls after 1 min of treatment, maintaining high levels through 40 min, and declining from 60 to 240 min. These data indicate that EGF stimulates active ERK in a time- and concentration-dependent manner in freshly isolated pGCs and that this experimental approach represents an effective manner with which to evaluate the role of EGF and the ERK signal transduction pathway in freshly harvested pGC. Copyright (C) 1999 Elsevier Science Inc.

Original languageEnglish (US)
Pages (from-to)654-658
Number of pages5
JournalSteroids
Volume64
Issue number9
DOIs
StatePublished - Jan 1 1999

Fingerprint

Granulosa Cells
Extracellular Signal-Regulated MAP Kinases
Epidermal Growth Factor
Protein Kinases
Swine
Phosphorylation
Mitogen-Activated Protein Kinase 7
Gels
Chemical activation
Antibodies
Signal transduction
Electrophoretic Mobility Shift Assay
Polyacrylamide Gel Electrophoresis
Anti-Idiotypic Antibodies
Ovary
Signal Transduction
Suspensions
Western Blotting

Keywords

  • ERK
  • Epidermal growth factor
  • MAP kinase
  • Signal transduction

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Endocrinology
  • Pharmacology
  • Clinical Biochemistry
  • Organic Chemistry

Cite this

Epidermal growth factor activates extracellular signal-regulated protein kinases (ERK) in freshly isolated porcine granulosa cells. / Keel, Brooks Allen; Davis, John S.

In: Steroids, Vol. 64, No. 9, 01.01.1999, p. 654-658.

Research output: Contribution to journalArticle

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