Membrane estrogen receptor-enriched GH3/B6 cells have an enhanced non-genomic response to estrogen

Todd C. Pappas, Bahiru Gametchu, Cheryl S. Watson

    Research output: Contribution to journalArticle

    35 Scopus citations


    We immunoselected GH3/B6 cells for a membrane estrogen receptor (mER) using antibodies generated against the rat intracellular ER (iER). Immunocytochemistry with anti-ER antibodies revealed bright fluorescence distributed in patches over the surface of mER-enriched cells, while cells immuno-depleted for mER showed only low-level membrane immunofluorescence. Quantitation via digital image analysis confirmed that immunoenriched populations show increases in both stained cell numbers and intensity of staining. Short-term culturing with serum reversibly decreased the intensity of immunostaining in mER-enriched cells to immuno-depleted cell levels. The mER-enriched populations initially contained ∼85% immunopositive cells in defined medium, but when cultured continuously with serum gradually decline to ∼22% immunopositive cells by 10 weeks. Cells enriched for mER showed a significant increase in rapid (after 2 or 5 min) prolactin release when treated with 17β-estradiol, while mER-depleted cells lacked this response. Immunoprecipitabie membrane proteins isolated from mER-enriched cells were 60,000, 74,000 and ∼ 200,000 MW, compared to an iER size of 67,000. Therefore, the presence and level of an mER that is antigenically related to iER is correlated with the ability of GH3/B6 cells to mediate a rapid action of estrogen.

    Original languageEnglish
    Pages (from-to)743-749
    Number of pages7
    Issue number10
    StatePublished - Oct 1995



    • estrogen receptor
    • GH/B6 cell
    • membrane
    • non-genomic
    • prolactin

    ASJC Scopus subject areas

    • Endocrinology
    • Endocrinology, Diabetes and Metabolism

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