RGD Reference Report - Expression of estrogen receptor-beta protein in rodent ovary. - Rat Genome Database

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Expression of estrogen receptor-beta protein in rodent ovary.

Authors: Fitzpatrick, SL  Funkhouser, JM  Sindoni, DM  Stevis, PE  Deecher, DC  Bapat, AR  Merchenthaler, I  Frail, DE 
Citation: Fitzpatrick SL, etal., Endocrinology. 1999 Jun;140(6):2581-91.
RGD ID: 8694156
Pubmed: PMID:10342845   (View Abstract at PubMed)
DOI: DOI:10.1210/endo.140.6.6928   (Journal Full-text)

Estrogen is an essential hormone for the LH surge and ovulation. The primary source of estrogen is from ovarian granulosa cells and in rats, estrogen, in turn, increases granulosa cell number and enhances FSH-stimulated gene expression in these cells. Thus, rat granulosa cells both respond to and synthesize estrogen. To further elucidate the mechanisms mediating the actions of estrogen in granulosa cells, we have identified and characterized the estrogen receptor-beta (ER-beta) subtype in rodent granulosa cells. ER-beta protein was localized to the nuclei of rat granulosa cells in preantral and antral follicles by immunocytochemistry, coincident with the location of ER-beta messenger RNA (mRNA). Immunoprecipitation and Western blot analysis using ER-beta specific antisera demonstrated a protein of approximately 60 kDa in granulosa cells prepared from PMSG-primed immature mice and estrogen-treated immature rats. Extracts from granulosa cells specifically bound an estrogen response element and the complex was recognized by antisera to ER-beta. A synthetic steroid estrogen radioligand, [125I]-17alpha-iodovinyl-11beta-methoxyestradiol ([125I]-VME2), bound to cytosolic granulosa cell preparations with high affinity (estimated K(D) value of 401 +/- 83 pM, and Bmax value of 102 +/- 9 fmol/mg protein). ER-beta protein levels rapidly declined following hCG treatment consistent with the reported decrease in binding activity and ER-beta mRNA levels by high levels of gonadotropins. Overall, we have demonstrated that 1) ER-beta protein is the dominant estrogen receptor subtype present in rodent granulosa cells, 2) this receptor is functional, and 3) it is regulated by ovulatory doses of gonadotropins. Thus, ER-beta is likely to be a mediator of estrogen action in rodent granulosa cells during follicular development.



Gene Ontology Annotations    Click to see Annotation Detail View

Biological Process

  
Object SymbolSpeciesTermQualifierEvidenceWithNotesSourceOriginal Reference(s)
Esr2Ratresponse to human chorionic gonadotropin  IEP  RGD 

Cellular Component

  
Object SymbolSpeciesTermQualifierEvidenceWithNotesSourceOriginal Reference(s)
Esr2Ratprotein-DNA complex  IDA  RGD 

Objects Annotated

Genes (Rattus norvegicus)
Esr2  (estrogen receptor 2)


Additional Information