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• W2081429963 abstract "Most of the signaling effectors located downstream of receptor activator of NF-κB (RANK) activation are calcium-sensitive. However, the early signaling events that lead to the mobilization of intracellular calcium in human osteoclasts are still poorly understood. The Ca2+-sensitive fluorescent probe Fura2 was used to detect changes in the intracellular concentration of Ca2+ ([Ca2+]i) in a model of human osteoclasts. Stimulating these cells with receptor activator of NF-κB ligand (RANKL) induced a rapid and significant increase in [Ca2+]i. Adding extracellular Ca2+ chelators, depleting intracellular stores, and the use of a phospholipase C inhibitor all indicated that the Ca2+ was of extracellular origin, suggesting the involvement of a Ca2+ channel. We showed that none of the classical Ca2+ channels (L-, T-, or R-type) were involved in the RANKL-induced Ca2+ spike. However, the effect of high doses of Gd3+ did suggest that TRP family channels were present in human osteoclasts. The TRPV-5 channel was expressed in osteoclasts and was mainly located in the cellular area in contact with the bone surface. Furthermore, the RNA inactivation of TRPV-5 channel completely inhibited the RANKL-induced increase in [Ca2+]i, which was accompanied in the long term by marked activation of bone resorption. Overall, our results show that RANKL induced a significant increase in [Ca2+]i of extracellular origin, probably as a result of the opening of TRPV-5 calcium channels on the surface of human osteoclasts. Our findings suggest that TRPV-5 contributes to maintaining the homeostasis of the human skeleton via a negative feedback loop in RANKL-induced bone resorption. Most of the signaling effectors located downstream of receptor activator of NF-κB (RANK) activation are calcium-sensitive. However, the early signaling events that lead to the mobilization of intracellular calcium in human osteoclasts are still poorly understood. The Ca2+-sensitive fluorescent probe Fura2 was used to detect changes in the intracellular concentration of Ca2+ ([Ca2+]i) in a model of human osteoclasts. Stimulating these cells with receptor activator of NF-κB ligand (RANKL) induced a rapid and significant increase in [Ca2+]i. Adding extracellular Ca2+ chelators, depleting intracellular stores, and the use of a phospholipase C inhibitor all indicated that the Ca2+ was of extracellular origin, suggesting the involvement of a Ca2+ channel. We showed that none of the classical Ca2+ channels (L-, T-, or R-type) were involved in the RANKL-induced Ca2+ spike. However, the effect of high doses of Gd3+ did suggest that TRP family channels were present in human osteoclasts. The TRPV-5 channel was expressed in osteoclasts and was mainly located in the cellular area in contact with the bone surface. Furthermore, the RNA inactivation of TRPV-5 channel completely inhibited the RANKL-induced increase in [Ca2+]i, which was accompanied in the long term by marked activation of bone resorption. Overall, our results show that RANKL induced a significant increase in [Ca2+]i of extracellular origin, probably as a result of the opening of TRPV-5 calcium channels on the surface of human osteoclasts. Our findings suggest that TRPV-5 contributes to maintaining the homeostasis of the human skeleton via a negative feedback loop in RANKL-induced bone resorption." @default.
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• W2081429963 date "2010-08-01" @default.
• W2081429963 modified "2023-10-18" @default.
• W2081429963 title "TRPV-5 Mediates a Receptor Activator of NF-κB (RANK) Ligand-induced Increase in Cytosolic Ca2+ in Human Osteoclasts and Down-regulates Bone Resorption" @default.
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• W2081429963 doi "https://doi.org/10.1074/jbc.m109.075234" @default.
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