The roles of prostanoids, leukotrienes, and platelet-activating factor in bone metabolism and disease

Progress in Lipid Research
Hisako HikijiSatoshi Ishii

Abstract

The production of a variety of lipid mediators is enhanced in bone-resorptive diseases such as osteoporosis, rheumatoid arthritis, osteoarthritis, and periodontitis. Prostaglandin E(2) (PGE(2)) is one of the most notable lipid mediators of bone remodeling, and has been linked clinically to many bone-resorptive diseases. In vitro studies with bone cell cultures have demonstrated that the bone-resorptive activity of PGE(2), which is mediated by receptor activator of NF-kappaB ligand (RANKL), is key for the induction of osteoclast formation. Furthermore, interleukin (IL)-1- and IL-6-stimulated bone resorption involves PGE(2) production. In addition to its bone-resorptive effects, PGE(2) promotes bone formation in vitro by stimulating osteoblastic proliferation and differentiation. The multifaceted nature of PGE(2) makes it difficult to discern its role during bone remodeling. Leukotrienes (LTs), and particularly LTB(4), have also been implicated in bone remodeling and disease-specifically in rheumatoid arthritis. Moreover, recent studies from our laboratory have shown that platelet-activating factor (PAF) receptor-deficient mice develop only mild osteoporosis. Osteoclast survival in these mice is shortened and osteoclastic bone re...Continue Reading

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Citations

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