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Inhibition of intravacuolar acidification by antisense RNA decreases osteoclast differentiation and bone resorption

T Laitala-Leinonen1, C Löwik, S Papapoulos

  • 1Department of Anatomy, Institute of Biomedicine, University of Turku, Finland. tilale@utu.fi.

Journal of Cell Science
|October 19, 1999
PubMed

Insights

Carbonic anhydrase II (CA II) and vacuolar H(+)-ATPase (V-ATPase) are crucial for osteoclast formation and bone resorption. Inhibiting these proteins with antisense RNA reduces osteoclast numbers and activity in vitro.

Area of Science:

  • Cell Biology
  • Biochemistry
  • Bone Biology

Background:

  • Osteoclast differentiation is essential for bone remodeling.
  • Proton transport and production are critical for osteoclast function.

Purpose of the Study:

  • To investigate the role of carbonic anhydrase II (CA II) and vacuolar H(+)-ATPase (V-ATPase) in osteoclast differentiation and bone resorption.
  • To determine if CA II and V-ATPase are involved in osteoclast formation beyond their role in resorption.

Main Methods:

  • In vitro study using antisense RNA to inhibit CA II and V-ATPase subunit expression.
  • Assessed bone resorption rate and osteoclast numbers in rat bone marrow and fetal mouse metacarpal cultures.
  • Measured intracellular acidification and hematopoietic stem cell differentiation.

Main Results:

  • Antisense treatment significantly decreased bone resorption and TRAP-positive osteoclast numbers.
  • Intravacuolar acidification was reduced, and osteoclast precursor fusion was inhibited by CA II antisense RNA.
  • V-ATPase inhibition abolished the stimulatory effects of GM-CSF, IL-3, and IL-6 on osteoclast formation.

Conclusions:

  • CA II and V-ATPase are vital for osteoclast formation, not solely for bone resorption.
  • These proteins play a significant role in the differentiation and fusion of osteoclast precursors.
  • Targeting CA II and V-ATPase may offer therapeutic strategies for bone resorption disorders.

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