Medical College of Wisconsin
CTSICores SearchResearch InformaticsREDCap

Estradiol protects against ethanol-induced bone loss by inhibiting up-regulation of receptor activator of nuclear factor-kappaB ligand in osteoblasts. J Pharmacol Exp Ther 2006 Dec;319(3):1182-90

Date

09/15/2006

Pubmed ID

16971503

DOI

10.1124/jpet.106.109454

Scopus ID

2-s2.0-33751178411   45 Citations

Abstract

To investigate the effects of sex hormones on ethanol (EtOH)-induced bone loss, female Sprague-Dawley rats were fed control or EtOH-containing diets (12 g/kg/day) by intragastric infusion. After 3 weeks, rats receiving EtOH had significant decreases in tibial trabecular and total bone mineral density, induction of receptor activator of nuclear factor-kappaB ligand (RANKL) mRNA expression, and enhanced bone resorption, all of which were prevented by treatment with 17beta-estradiol (E(2)). The addition of progesterone did not enhance the beneficial effect of E(2) alone. Consistent with our in vivo findings, EtOH stimulated RANKL mRNA expression in cultured primary osteoblasts, and this expression was blocked by 4-methylpyrazole. Acetaldehyde also induced RANKL expression. Class 1 alcohol dehydrogenase was found to be expressed and EtOH-inducible in cultured osteoblasts, whereas CYP2E1 was undetectable. We found that EtOH induced phosphorylation of extracellular signal-regulated kinase (ERK) and signal transducers and activators of transcription 3 (STAT3). E(2) and the mitogenactivated protein kinase kinase inhibitor 2'-amino-3'-methoxyflavone (PD98059) blocked ERK and STAT3 phosphorylation and blocked RANKL induction. Moreover, E(2) completely blocked EtOH-induced osteoclastogenesis in a primary osteoblast and osteoclast precursor coculture system. The E(2) effects were estrogen receptor-mediated. Therefore, E(2) prevents EtOH-induced bone loss by opposing the induction of RANKL mRNA in osteoblasts and ethanol-induced osteoclastogenesis, through opposing effects on sustained ERK signaling.

Author List

Chen JR, Haley RL, Hidestrand M, Shankar K, Liu X, Lumpkin CK, Simpson PM, Badger TM, Ronis MJ

Authors

Mats Hidestrand PhD Adjunct Assistant Professor in the Surgery department at Medical College of Wisconsin
Pippa M. Simpson PhD Chief, Professor in the Pediatrics department at Medical College of Wisconsin




MESH terms used to index this publication - Major topics in bold

Animals
Biomarkers
Blotting, Western
Bone Marrow
Bone Resorption
Cells, Cultured
Central Nervous System Depressants
Estradiol
Ethanol
Extracellular Signal-Regulated MAP Kinases
Female
Gene Expression
Lymphocyte Activation
NF-kappa B
Osteoblasts
Osteoclasts
Pregnancy
Progesterone
RANK Ligand
Rats
Rats, Sprague-Dawley
Reverse Transcriptase Polymerase Chain Reaction
Signal Transduction
Tomography, X-Ray Computed
Up-Regulation
jenkins-FCD Prod-411 e00897e83867fcfa48419861683711f8d99adb75