A murine model of inflammatory bone disease

Area of Science:

• Genetics
• Immunology
• Skeletal Biology

Background:

• A novel recessive mutation on mouse chromosome 18 causes tail kinks and limb deformities.
• Preliminary bone examination revealed abnormalities resembling chronic recurrent multifocal osteomyelitis (CMO).

Purpose of the Study:

• To investigate the bone histology in CMO mice.
• To assess the osteoclast (OCL) formation capacity of bone marrow cells from CMO mice.
• To identify soluble factors from CMO marrow cells that influence OCL formation.

Main Methods:

• Histological analysis of bones from CMO mice.
• In vitro culture of bone marrow cells to assess osteoclastogenesis.
• Testing conditioned media from CMO marrow cells for osteoclast-inducing activity in normal murine marrow cultures.

Main Results:

• CMO mouse bone histology shows inflammatory bone disease.
• Marrow cells from CMO mice exhibit enhanced osteoclast formation capacity.
• Conditioned media from CMO marrow cells contain soluble factor(s) that promote osteoclastogenesis in normal marrow cultures.

Conclusions:

• The bone disease in CMO mice is inflammatory.
• A novel soluble factor, distinct from IL-1α, IL-6, or TNF-α, is released by CMO marrow cells.
• This factor contributes to enhanced osteoclast formation, driving the observed bone pathology.