The dynamic and elusive membrane estrogen receptor-α

Cheryl S. Watson, Celeste Finnerty, Bahiru Gametchu

Research output: Contribution to journalArticle

69 Citations (Scopus)

Abstract

Many studies have demonstrated the nuclear forms of steroid receptors and their activities, while fewer investigators have identified and described the membrane forms of these receptors. Our immuno-identification approaches for the qualitative and quantitative comparison of the membrane form of the estrogen receptor-α (mERα) to its nuclear counterpart now allow us to address questions about the comparative levels and regulation of these receptor forms. ERα-specific antisense oligonucleotides eliminate mERα expression, while only mildly reducing the nuclear ERα. Success of immuno-identification for the mERα is very sensitive to different fixation protocols, affecting cell permeability (and thus distinction from the intracellular form) and differential epitope preservation. All such identifications must be accompanied by proof of cell membrane integrity and focal plane assessments. The mERα expression on selected cells declines rapidly with cell passage number and cell density. Expression of mERα is enhanced by serum starvation and selection for specific phases of the cell cycle. The hinge region of the protein is sensitive to ligand-induced epitope masking and to antibody-induced changes in receptor-mediated responses. Responsive cells are often diluted within cell populations by loss of the membrane receptor form. The bimodality of the rapid estrogen action, with inhibitory doses between picomolar and nanomolar stimulatory concentrations, requires detailed dose-response curves. Finally, responsive cells can be lost from assays, as upon estrogen treatment they rapidly round up and leave the substrates to which they are attached. These regulatory phenomena demonstrate that levels of the membrane form of the estrogen receptor are very dynamic.

Original languageEnglish (US)
Pages (from-to)429-437
Number of pages9
JournalSteroids
Volume67
Issue number6
DOIs
StatePublished - 2002

Fingerprint

Estrogen Receptors
Membranes
Epitopes
Estrogens
Cell Count
Cells
Antisense Oligonucleotides
Steroid Receptors
Hinges
Cell membranes
Starvation
Permeability
Assays
Cell Cycle
Research Personnel
Cell Membrane
Ligands
Antibodies
Substrates
Serum

Keywords

  • Cancer
  • Immunocytochemistry
  • Nongenomic
  • Rapid
  • Steroid

ASJC Scopus subject areas

  • Biochemistry
  • Endocrinology
  • Molecular Biology

Cite this

The dynamic and elusive membrane estrogen receptor-α. / Watson, Cheryl S.; Finnerty, Celeste; Gametchu, Bahiru.

In: Steroids, Vol. 67, No. 6, 2002, p. 429-437.

Research output: Contribution to journalArticle

Watson, Cheryl S. ; Finnerty, Celeste ; Gametchu, Bahiru. / The dynamic and elusive membrane estrogen receptor-α. In: Steroids. 2002 ; Vol. 67, No. 6. pp. 429-437.
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