Rosiglitazone induces decreases in bone mass and strength that are reminiscent of aged bone. - GreenMedInfo Summary
Rosiglitazone induces decreases in bone mass and strength that are reminiscent of aged bone.
Endocrinology. 2007 Jun;148(6):2669-80. Epub 2007 Mar 1. PMID: 17332064
Department of Geriatrics, Reynolds Institute on Aging, 629 Jack Stephens Drive, Little Rock, AR 72205, USA.
Peroxisome proliferator-activated receptor-gamma (PPARgamma) regulates both glucose metabolism and bone mass. Recent evidence suggests that the therapeutic modulation of PPARgamma activity with antidiabetic thiazolidinediones elicits unwanted effects on bone. In this study, the effects of rosiglitazone on the skeleton of growing (1 month), adult (6 month), and aged (24 month) C57BL/6 mice were determined. Aging was identified as a confounding factor for rosiglitazone-induced bone loss that correlated with the increased expression of PPARgamma in bone marrow mesenchymal stem cells. The bone of young growing mice was least affected, although a significant decrease in bone formation rate was noted. In both adult and aged animals, bone volume was significantly decreased by rosiglitazone. In adult animals, bone loss correlated with attenuated bone formation, whereas in aged animals, bone loss was associated with increased osteoclastogenesis, mediated by increased receptor activator of nuclear factor-kappaB ligand (RANKL) expression. PPARgamma activation led to changes in marrow structure and function such as a decrease in osteoblast number, an increase in marrow fat cells, an increase in osteoclast number, and a loss of the multipotential character of marrow mesenchymal stem cells. In conclusion, rosiglitazone induces changes in bone reminiscent of aged bone and appears to induce bone loss by altering the phenotype of marrow mesenchymal stem cells.