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Updated: May 28, 2026

Identification of Inositol Phosphate or Phosphoinositide Interacting Proteins by Affinity Chromatography Coupled to Western Blot or Mass Spectrometry
08:07

Identification of Inositol Phosphate or Phosphoinositide Interacting Proteins by Affinity Chromatography Coupled to Western Blot or Mass Spectrometry

Published on: July 26, 2019

Inositol polyphosphate 4-phosphatase B as a regulator of bone mass in mice and humans

Mathieu Ferron1, Maya Boudiffa, Michel Arsenault

  • 1Institut de Recherches Cliniques de Montréal, Montréal, Québec H2W 1R7, Canada.

Cell Metabolism
|October 11, 2011
PubMed

Insights

Inositol polyphosphate 4-phosphatase type IIα (Inpp4bα) regulates osteoclast differentiation, a key process in osteoporosis. This gene influences bone mineral density in both mice and humans.

Area of Science:

  • Molecular Biology
  • Genetics
  • Bone Biology

Background:

  • Osteoporosis is a complex genetic disorder causing reduced bone mass.
  • Dysregulation of osteoclast differentiation or maturation is a primary cause of osteoporosis.

Purpose of the Study:

  • To identify and characterize novel regulators of osteoclastogenesis.
  • To investigate the role of Inpp4bα in bone metabolism and its link to osteoporosis.

Main Methods:

  • Investigated the expression of Inpp4bα during osteoclast differentiation.
  • Utilized ex vivo and in vivo models with targeted Inpp4bα expression.
  • Analyzed intracellular calcium levels and NFATc1 activation.
  • Examined bone mineral density in Inpp4b-deficient mice.

Main Results:

  • Inpp4bα expression is present throughout osteoclast differentiation.
  • Native Inpp4bα repressed, while inactive Inpp4bα stimulated, osteoclast differentiation.
  • Inpp4bα modulates intracellular calcium, affecting NFATc1 activation.
  • Inpp4b deficiency led to increased osteoclastogenesis, reduced bone mass, and osteoporosis in mice.
  • Human INPP4B was identified as a susceptibility locus for osteoporosis.

Conclusions:

  • Inpp4b is a significant regulator of osteoclast differentiation.
  • Inpp4b influences bone mineral density variability in both mice and humans.
  • Inpp4b represents a potential therapeutic target for osteoporosis.

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