Inositol Polyphosphate 4-phosphatase B As a Regulator of Bone Mass in Mice and Humans

Overview

Journal Cell Metab

Publisher Cell Press

Specialties Cell Biology
Endocrinology

Date 2011 Oct 11

PMID 21982707

Citations 27

Authors

Mathieu Ferron

Maya Boudiffa

Michel Arsenault

Mohamed Rached

Monica Pata

Sylvie Giroux

Latifa Elfassihi

Marina Kisseleva

Philip W Majerus

Francois Rousseau

Jean Vacher

Affiliations

Soon will be listed here.

Abstract

Osteoporosis is a multifactorial genetic disease characterized by reduction of bone mass due to dysregulation of osteoclast differentiation or maturation. Herein, we identified a regulator of osteoclastogenesis, the murine homolog of inositol polyphosphate 4-phosphatase type IIα (Inpp4bα). Expression of Inpp4bα is detected from early osteoclast differentiation to activation stage. Targeted expression of native Inpp4bα ex vivo repressed whereas phosphatase-inactive Inpp4bα stimulated osteoclast differentiation. Inpp4bα acts on intracellular calcium level that modulates NFATc1 nuclear translocation and activation. In vivo mice deficient in Inpp4b displayed increased osteoclast differentiation rate and potential resulting in decreased bone mass and osteoporosis. Importantly, INPP4B in human was identified as a susceptibility locus for osteoporosis. This study defined Inpp4b as a major modulator of the osteoclast differentiation and as a gene linked to variability of bone mineral density in mice and humans.

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