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Department of Obstetrics and Gynecology, Osaka University Graduate School of Medicine, Osaka 565-0871, Japan
Alendronate, a nitrogen-containing bisphosphonate, is a potent inhibitor of bone resorption used for the treatment and prevention of osteoporosis. Recent findings suggest that alendronate and other nitrogen-containing bisphosphonates inhibit the mevalonate pathway and thereby inhibit the synthesis of products derived from this metabolite. This, in turn, prevents the prenylation of a number of small GTPases, which regulate cell growth, motility, and invasion. We studied the effect of alendronate on in vitro migration of human ovarian cancer cells. Lysophosphatidic acid (LPA) induced a dose-dependent increase of migration of cancer cells by promoting Rho/Rho-associated kinase signaling. The induction of cancer cell migration by LPA was inhibited by the addition of alendronate in a dose-dependent manner. Treatment of ovarian cancer cells with alendronate resulted in inactivation of Rho, changes of cell morphology, loss of stress fiber formation, and focal adhesion assembly, and the suppression of phosphorylation of myosin light chain and tyrosine phosphorylation of focal adhesion proteins, which are essential processes for cell migration. The effects of alendronate on cancer cells were prevented by the addition of geranylgeranyol, which is the metabolic intermediate of the mevalonate pathway. These results suggest that alendronate inhibits Rho activation by preventing geranylgeranylation, which results in inhibition of LPA-induced migration of human ovarian cancer cells.
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