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Aryl hydrocarbon receptor catabolic activity in bone metabolism is osteoclast dependent in vivo.

Abstract：

:Bone mass is regulated by various molecules including endogenous factors as well as exogenous factors, such as nutrients and pollutants. Aryl hydrocarbon receptor (AhR) is known as a dioxin receptor and is responsible for various pathological and physiological processes. However, the role of AhR in bone homeostasis remains elusive because the cell type specific direct function of AhR has never been explored in vivo. Here, we show the cell type specific function of AhR in vivo in bone homeostasis. Systemic AhR knockout (AhRKO) mice exhibit increased bone mass with decreased resorption and decreased formation. Meanwhile, osteoclast specific AhRKO (AhR(ΔOc/ΔOc)) mice have increased bone mass with reduced bone resorption, although the mice lacking AhR in osteoblasts have a normal bone phenotype. Even under pathological conditions, AhR(ΔOc/ΔOc) mice are resistant to sex hormone deficiency-induced bone loss resulting from increased bone resorption. Furthermore, 3-methylcholanthrene, an AhR agonist, induces low bone mass with increased bone resorption in control mice, but not in AhR(ΔOc/ΔOc) mice. Taken together, cell type specific in vivo evidence for AhR functions indicates that osteoclastic AhR plays a significant role in maintenance of bone homeostasis, suggesting that inhibition of AhR in osteoclasts can be beneficial in the treatment of osteoporosis.

journal_name

Biochem Biophys Res Commun

journal_title

Biochemical and biophysical research communications

authors

Yu TY,Kondo T,Matsumoto T,Fujii-Kuriyama Y,Imai Y

doi

10.1016/j.bbrc.2014.05.114

subject

Has Abstract

pub_date

2014-07-18 00:00:00

pages

416-22

issue

1

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(14)01003-1

journal_volume

450

pub_type

杂志文章

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