miR-433-3p suppresses bone formation and mRNAs critical for osteoblast function in mice.
CELL/TISSUE SIGNALING
GENETIC ANIMAL MODELS
GLUCOCORTICOID
MOLECULAR PATHWAYS - REMODELING
OSTEOBLAST
TOUGH DECOY
WNT/β-CATENIN/LRPS
Wnt
miR-433
miRNA
Journal
Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research
ISSN: 1523-4681
Titre abrégé: J Bone Miner Res
Pays: United States
ID NLM: 8610640
Informations de publication
Date de publication:
09 2021
09 2021
Historique:
revised:
03
05
2021
received:
06
05
2020
accepted:
10
05
2021
pubmed:
19
5
2021
medline:
27
10
2021
entrez:
18
5
2021
Statut:
ppublish
Résumé
MicroRNAs (miRNAs) are key posttranscriptional regulators of osteoblastic commitment and differentiation. miR-433-3p was previously shown to target Runt-related transcription factor 2 (Runx2) and to be repressed by bone morphogenetic protein (BMP) signaling. Here, we show that miR-433-3p is progressively decreased during osteoblastic differentiation of primary mouse bone marrow stromal cells in vitro, and we confirm its negative regulation of this process. Although repressors of osteoblastic differentiation often promote adipogenesis, inhibition of miR-433-3p did not affect adipocyte differentiation in vitro. Multiple pathways regulate osteogenesis. Using luciferase-3' untranslated region (UTR) reporter assays, five novel miR-433-3p targets involved in parathyroid hormone (PTH), mitogen-activated protein kinase (MAPK), Wnt, and glucocorticoid signaling pathways were validated. We show that Creb1 is a miR-433-3p target, and this transcription factor mediates key signaling downstream of PTH receptor activation. We also show that miR-433-3p targets hydroxysteroid 11-β dehydrogenase 1 (Hsd11b1), the enzyme that locally converts inactive glucocorticoids to their active form. miR-433-3p dampens glucocorticoid signaling, and targeting of Hsd11b1 could contribute to this phenomenon. Moreover, miR-433-3p targets R-spondin 3 (Rspo3), a leucine-rich repeat-containing G-protein coupled receptor (LGR) ligand that enhances Wnt signaling. Notably, Wnt canonical signaling is also blunted by miR-433-3p activity. In vivo, expression of a miR-433-3p inhibitor or tough decoy in the osteoblastic lineage increased trabecular bone volume. Mice expressing the miR-433-3p tough decoy displayed increased bone formation without alterations in osteoblast or osteoclast numbers or surface, indicating that miR-433-3p decreases osteoblast activity. Overall, we showed that miR-433-3p is a negative regulator of bone formation in vivo, targeting key bone-anabolic pathways including those involved in PTH signaling, Wnt, and endogenous glucocorticoids. Local delivery of miR-433-3p inhibitor could present a strategy for the management of bone loss disorders and bone defect repair. © 2021 American Society for Bone and Mineral Research (ASBMR).
Substances chimiques
MicroRNAs
0
RNA, Messenger
0
Types de publication
Journal Article
Research Support, N.I.H., Extramural
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
1808-1822Informations de copyright
© 2021 American Society for Bone and Mineral Research (ASBMR).
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