title: Biological and biochemical consequences of global deletion of exon 3 from the ER alpha gene.
abstract: To address issues resulting from α estrogen receptor-knockout (αERKO) residual N-terminal truncated estrogen receptor α, and to allow tissue-selective deletion of ERα, we generated loxP-flanked exon 3 mice. Initial characterization of global sox2 cre-derived exon 3-deleted Ex3αERKO mice indicated no ERα protein in uterine tissue and recapitulation of previously described female phenotypes, confirming successful ablation of ERα. Body weights of Ex3αERKO female mice were 1.4-fold higher than wild-tupe (WT) females and comparable to WT males. Microarray indicated the Ex3αERKO uterus is free of residual estrogen responses. RT-PCR showed Nr4a1 is increased 41-fold by estrogen in WT and 7.4-fold in αERKO, and not increased in Ex3αERKO. Nr4a1, Cdkn1a, and c-fos transcripts were evaluated in WT and Ex3αERKO mice following estrogen, IGF1, or EGF injections. All 3 were increased by all treatments in WT. None were increased by estrogen in Ex3αERKO. Nr4a1 increased 24.5- and 14.7-fold, Cdkn1a increased 14.2- and 12.3-fold, and c-fos increased 20.9-fold and 16.2-fold after IGF1 and EGF treatments, respectively, in the Ex3αERKO mice, confirming that growth factor regulation is independent of ERα. Our Ex3α ERα model will be useful in studies of complete or selective ablation of ERα in target tissues.
authors.affiliation: Laboratory of Reproductive and Developmental Toxicology, National Institutes of Health, Research Triangle Park, North Carolina, USA. curtiss@niehs.nih.gov
authors.forename: Sylvia C
authors.initials: SC
authors.lastname: Hewitt
authors.forename: Grace E
authors.initials: GE
authors.lastname: Kissling
authors.forename: Karen E
authors.initials: KE
authors.lastname: Fieselman
authors.forename: Friederike L
authors.initials: FL
authors.lastname: Jayes
authors.forename: Kevin E
authors.initials: KE
authors.lastname: Gerrish
authors.forename: Kenneth S
authors.initials: KS
authors.lastname: Korach
mesh_terms: D000818:Animals; D015153:Blotting, Western; D001835:Body Weight / Q000235:genetics; D050759:Cyclin-Dependent Kinase Inhibitor p21 / Q000235:genetics; D047628:Estrogen Receptor alpha / Q000235:genetics* / Q000378:metabolism*; D004967:Estrogens / Q000494:pharmacology; D005091:Exons / Q000235:genetics*; D005260:Female; D015870:Gene Expression / Q000235:genetics; D007150:Immunohistochemistry; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D057105:Nuclear Receptor Subfamily 4, Group A, Member 1 / Q000235:genetics; D020411:Oligonucleotide Array Sequence Analysis; D016760:Proto-Oncogene Proteins c-fos / Q000235:genetics; D020133:Reverse Transcriptase Polymerase Chain Reaction; D017384:Sequence Deletion / Q000235:genetics*; D014599:Uterus / Q000378:metabolism
chemical_list: C493957:Cdkn1a protein, mouse; D050759:Cyclin-Dependent Kinase Inhibitor p21; D047628:Estrogen Receptor alpha; D004967:Estrogens; C539818:Nr4a1 protein, mouse; D057105:Nuclear Receptor Subfamily 4, Group A, Member 1; D016760:Proto-Oncogene Proteins c-fos