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Deletion of IL-17ra in osteoclast precursors increases bone mass by decreasing osteoclast precursor abundance

•Conditional deletion of IL-17ra in LysM+ osteoclast precursors increases trabecular bone mass in young, unchallenged mice.•IL-17ra deletion in pre-osteoclasts decreases osteoclast number and activity in vivo.•Conditional deletion of IL-17ra decreases the abundance of bone marrow-derived osteoclast...

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Published in:Bone (New York, N.Y.) N.Y.), 2022-04, Vol.157, p.116310-116310, Article 116310
Main Authors: Roberts, Joseph L., Mella-Velazquez, Giovanni, Dar, Hamid Y., Liu, Guanglu, Drissi, Hicham
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container_title Bone (New York, N.Y.)
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creator Roberts, Joseph L.
Mella-Velazquez, Giovanni
Dar, Hamid Y.
Liu, Guanglu
Drissi, Hicham
description •Conditional deletion of IL-17ra in LysM+ osteoclast precursors increases trabecular bone mass in young, unchallenged mice.•IL-17ra deletion in pre-osteoclasts decreases osteoclast number and activity in vivo.•Conditional deletion of IL-17ra decreases the abundance of bone marrow-derived osteoclast progenitor populations. Metabolic bone diseases, such as osteoporosis, typically reflect an increase in the number and activity of bone-resorbing osteoclasts that result in a loss of bone mass. Inflammatory mediators have been identified as drivers of both osteoclast formation and activity. The IL-17 family of inflammatory cytokines has gained attention as important contributors to both bone formation and resorption. The majority of IL-17 cytokines signal through receptor complexes containing IL-17a receptor (IL-17ra); however, the role of IL-17ra signaling in osteoclasts remains elusive. In this study, we conditionally deleted Il17ra in osteoclast precursors using LysM-Cre and evaluated the phenotypes of skeletally mature male and female conditional knockout and control mice. The conditional knockout mice displayed an increase in trabecular bone microarchitecture in both the appendicular and axial skeleton. Assessment of osteoclast formation in vitro revealed that deletion of Il17ra decreased osteoclast number, which was confirmed in vivo using histomorphometry. This phenotype was likely driven by a lower abundance of osteoclast precursors in IL-17ra conditional knockout mice. This study suggests that IL-17ra signaling in preosteoclasts can contribute to osteoclast formation and subsequent bone loss.
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Metabolic bone diseases, such as osteoporosis, typically reflect an increase in the number and activity of bone-resorbing osteoclasts that result in a loss of bone mass. Inflammatory mediators have been identified as drivers of both osteoclast formation and activity. The IL-17 family of inflammatory cytokines has gained attention as important contributors to both bone formation and resorption. The majority of IL-17 cytokines signal through receptor complexes containing IL-17a receptor (IL-17ra); however, the role of IL-17ra signaling in osteoclasts remains elusive. In this study, we conditionally deleted Il17ra in osteoclast precursors using LysM-Cre and evaluated the phenotypes of skeletally mature male and female conditional knockout and control mice. The conditional knockout mice displayed an increase in trabecular bone microarchitecture in both the appendicular and axial skeleton. Assessment of osteoclast formation in vitro revealed that deletion of Il17ra decreased osteoclast number, which was confirmed in vivo using histomorphometry. This phenotype was likely driven by a lower abundance of osteoclast precursors in IL-17ra conditional knockout mice. 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subjects Animals
Bone Density
Bone resorption
Bone Resorption - metabolism
Bone turnover
Cytokine
Cytokines - metabolism
Female
IL-17a
Inflammation
Interleukin-17 - genetics
Male
Mice
Mice, Knockout
Osteoclasts - metabolism
title Deletion of IL-17ra in osteoclast precursors increases bone mass by decreasing osteoclast precursor abundance
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