Modulation of strain-specific differences in gene expression by cannabinoid type 2 receptor deficiency

Area of Science:

• Genetics
• Molecular Biology
• Skeletal Biology

Background:

• Cannabinoid receptor type 2 (Cnr2) plays a role in skeletal homeostasis.
• Previous research indicates strain-dependent skeletal consequences of Cnr2 deficiency in mice.

Purpose of the Study:

• To investigate the molecular mechanisms underlying strain-specific skeletal phenotypes in Cnr2-deficient mice.
• To compare global gene expression in bone from different mouse strains lacking Cnr2.

Main Methods:

• Global gene expression analysis using microarrays in wild-type and Cnr2 (-/-) CD1 and C57BL/6 mice.
• Bioinformatic analysis of gene expression data to identify differentially expressed genes and enriched gene ontology (GO) terms.

Main Results:

• Trabecular bone volume showed opposing changes in Cnr2 (-/-) CD1 (increased) versus C57BL/6 (decreased) mice.
• Microarray analysis identified 354 genes significantly affected by Cnr2 deficiency.
• Bioinformatic analysis revealed Cnr2-dependent enrichment of GO terms related to immune response, nucleotide binding, extracellular region, and cell surface interactions.

Conclusions:

• Cnr2 deficiency profoundly alters gene expression in mouse bone, affecting pathways like immune response and extracellular matrix organization.
• These gene expression changes provide a molecular basis for the observed strain-specific skeletal phenotypes in Cnr2-deficient mice.
• Understanding these genetic differences is crucial for deciphering the role of cannabinoid receptor signalling in skeletal health and disease.