Quantitative measurement of estrogen-induced ERK 1 and 2 activation via multiple membrane-initiated signaling pathways

Nataliya N. Bulayeva, Bahiru Gametchu, Cheryl S. Watson

Research output: Contribution to journalArticle

96 Scopus citations

Abstract

Estradiol (E2) and other steroids have recently been shown to initiate various intracellular signaling cascades from the plasma membrane, including those stimulating mitogen-activated protein kinases (MAPKs), and particularly extracellular-regulated kinases (ERKs). In this study we demonstrated the ability of E2 to activate ERKs in the GH3/B6/F10 pituitary tumor cell line, originally selected for its enhanced expression of membrane estrogen receptor-α (mERα). We compared E2 to its cell-impermeable analog (E2 conjugated to peroxidase, E 2-P), and to the synthetic estrogen diethylstilbestrol (DES). Time-dependent ERK activation was quantified with a novel fixed cell-based immunoassay developed to efficiently determine activation by multiple compounds over multiple parameters. Both E2 and DES produced bimodal responses, but with distinctly different time courses of enzyme phosphorylation (activation) and inactivation; E2-P induced a monophasic ERK activation. E2 also phosphorylated ERKs in concentration-dependent manner with two concentration optima (10-14 and 10-8M). Inhibitors were employed to determine pathway (ER, EGFR, membrane organization, PI3 kinase, Src kinase, Ca2+) involvement and timing of pathway activations; all affected ERK activation as early as 3-6min, suggesting simultaneous, not sequential, activation. Therefore, E2 and other estrogenic compounds can produce rapid ERK phosphorylations via nongenomic pathways, using more than one pathway for signal generation.

Original languageEnglish (US)
Pages (from-to)181-192
Number of pages12
JournalSteroids
Volume69
Issue number3
DOIs
StatePublished - Mar 1 2004

Keywords

  • Ca
  • EGF receptor
  • Membrane estrogen receptor
  • Non-genomic
  • PI3K
  • Signaling pathway inhibitors
  • Src kinase

ASJC Scopus subject areas

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

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