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Clinical Chemistry, Sahlgrenska University Hospital, Gothenburg, Sweden
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The Long Beach VA Medical Center, Long Beach, California, USA
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The importance of estrogen receptor α (ERα) for the regulation of bone mass in males is well established. ERα mediates estrogenic effects both via nuclear and membrane-initiated ERα (mERα) signaling. The role of mERα signaling for the effects of estrogen on bone in male mice is unknown. To investigate the role of mERα signaling, we have used mice (Nuclear-Only-ER; NOER) with a point mutation (C451A), which results in inhibited trafficking of ERα to the plasma membrane. Gonadal-intact male NOER mice had a significantly decreased total body areal bone mineral density (aBMD) compared to WT littermates at 3, 6 and 9 months of age as measured by dual-energy X-ray absorptiometry (DEXA). High-resolution microcomputed tomography (µCT) analysis of tibia in 3-month-old males demonstrated a decrease in cortical and trabecular thickness in NOER mice compared to WT littermates. As expected, estradiol (E2) treatment of orchidectomized (ORX) WT mice increased total body aBMD, trabecular BV/TV and cortical thickness in tibia compared to placebo treatment. E2 treatment increased these skeletal parameters also in ORX NOER mice. However, the estrogenic responses were significantly decreased in ORX NOER mice compared with ORX WT mice. In conclusion, mERα is essential for normal estrogen signaling in both trabecular and cortical bone in male mice. Increased knowledge of estrogen signaling mechanisms in the regulation of the male skeleton may aid in the development of new treatment options for male osteoporosis.
Section of Hematology and Medical Oncology, Structural and Cellular Biology, Department of Medical Genetics, Center for Nuclear Receptors and Cell Signaling, Department of Medicine, Tulane University, 1430 Tulane Avenue, SL-78, New Orleans, Louisiana 70112, USA Departments of
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Section of Hematology and Medical Oncology, Structural and Cellular Biology, Department of Medical Genetics, Center for Nuclear Receptors and Cell Signaling, Department of Medicine, Tulane University, 1430 Tulane Avenue, SL-78, New Orleans, Louisiana 70112, USA Departments of
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Introduction Various agents regulate estrogen receptor α (ERα) activity in addition to 17β-estradiol (E 2 ), including peptide growth factors (PGFs) such as epidermal growth factor (EGF) and insulin-like growth factor 1 (IGF1; Ignar-Trowbridge et
Department of Neurosurgery, Farber Institute for Neurosciences, Thomas Jefferson University, 900 Walnut Street, Suite 400, Philadelphia, Pennsylvania 19107, USA
Department of Biology, Washington and Lee University, Lexington, Virginia 24450-03, USA
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Department of Neurosurgery, Farber Institute for Neurosciences, Thomas Jefferson University, 900 Walnut Street, Suite 400, Philadelphia, Pennsylvania 19107, USA
Department of Biology, Washington and Lee University, Lexington, Virginia 24450-03, USA
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Department of Neurosurgery, Farber Institute for Neurosciences, Thomas Jefferson University, 900 Walnut Street, Suite 400, Philadelphia, Pennsylvania 19107, USA
Department of Biology, Washington and Lee University, Lexington, Virginia 24450-03, USA
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Department of Neurosurgery, Farber Institute for Neurosciences, Thomas Jefferson University, 900 Walnut Street, Suite 400, Philadelphia, Pennsylvania 19107, USA
Department of Biology, Washington and Lee University, Lexington, Virginia 24450-03, USA
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Department of Neurosurgery, Farber Institute for Neurosciences, Thomas Jefferson University, 900 Walnut Street, Suite 400, Philadelphia, Pennsylvania 19107, USA
Department of Biology, Washington and Lee University, Lexington, Virginia 24450-03, USA
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Department of Neurosurgery, Farber Institute for Neurosciences, Thomas Jefferson University, 900 Walnut Street, Suite 400, Philadelphia, Pennsylvania 19107, USA
Department of Biology, Washington and Lee University, Lexington, Virginia 24450-03, USA
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suppression of LH secretion. Table 1 Number of estrogen receptor α (ERα), dopamine-β-hydroxylase (DBH), and dual-labeled cells in the nucleus of the solitary tract of 48-h fasted and unfasted ovariectomized rats ( n =4) ER α DBH ER α+ DBH Double
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XJ Yu L Song HJ Li M Lu JM Zhao YL 2003 Up-regulation of LRP16 mRNA by 17β-estradiol through activation of estrogen receptor α (ERα), but not estrogen receptor β (ERβ), and promotes human breast cancer MCF-7 cell proliferation: a
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Medicine 13 89 – 94 . Gao H Falt S Sandelin A Gustafsson JA Dahlman-Wright K 2008 Genome-wide identification of estrogen receptor α-binding sites in mouse liver . Molecular Endocrinology 22 10 – 22 . Geisler JG Zawalich W Zawalich
Department of Biological Sciences, Lock Haven University, Lock Haven, Pennsylvania 17745, USA
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Department of Biological Sciences, Lock Haven University, Lock Haven, Pennsylvania 17745, USA
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Department of Biological Sciences, Lock Haven University, Lock Haven, Pennsylvania 17745, USA
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Department of Biological Sciences, Lock Haven University, Lock Haven, Pennsylvania 17745, USA
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distribution and quantitative analysis of estrogen receptor-α (ERα) and estrogen receptor-β (ERβ) messenger ribonucleic acid in the wild-type and ERα-knockout mouse. Endocrinology 138 4613 –4621. Couse JF , Bunch DO, Lindzey J
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-Buck V & Gannon F 1998 Differentially expressed messenger RNA isoforms of the human estrogen receptor-α gene are generated by alternative splicing and promoter usage. Molecular Endocrinology 12 1939 –1954. Friend KE
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Introduction The steroid hormone 17β-estradiol (E 2 ) regulates numerous physiological and developmental processes in target tissues by binding to its cognate receptors estrogen receptor-α (ESR1) and -β (ESR2) in the presence of numerous co
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et al . 2003 , Khalyfa et al . 2003 , Bourdeau et al . 2004 ). Estrogens modulate transcription in their target tissues through estrogen receptor α (ERα) or ERβ receptors using a number of signaling pathways. The ‘classical’ pathway involves
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blot analysis showing expression of the estrogen receptor-α (ERα), the progesterone receptor (PR), and the ERβ in cloned MCF-7 cells stably transfected with a vector producing a small interfering RNA (siRNA) to the insulin-like growth factor-I receptor