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Current Stem Cell Research & Therapy

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ISSN (Print): 1574-888X
ISSN (Online): 2212-3946

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Research Article

LCN2 Inhibits the BMP9-induced Osteogenic Differentiation through Reducing Wnt/β-catenin Signaling via Interacting with LRP6 in Mouse Embryonic Fibroblasts

Author(s): Jin-Hai Jiang, Shi-Yu Wang, Jie Zhang, Hang Liu, Kai-Xin Ke, Yue Jiang, Lu Liu, Si-Yuan Liu, Xiang Gao and Bai-Cheng He*

Volume 18, Issue 8, 2023

Published on: 10 April, 2023

Page: [1160 - 1171] Pages: 12

DOI: 10.2174/1574888X18666230320091546

open access plus

Abstract

Background: Due to its effective osteogenic ability, BMP9 is a promising candidate for bone regeneration medicine. Whereas, BMP9 can also induce adipogenesis simultaneously. LCN2 is a cytokine associated with osteogenesis and adipogenesis. Reducing the adipogenic potential may be a feasible measure to enhance the osteogenic capability of BMP9.

Objective: The objective of the study was to explore the role of LCN2 in regulating the BMP9-initialized osteogenic and adipogenic differentiation in mouse embryonic fibroblasts (MEFs), and clarify the possible underlying mechanism.

Methods: Histochemical stain, western blot, real-time PCR, laser confocal, immunoprecipitation, cranial defect repair, and fetal limb culture assays were used to evaluate the effects of LCN2 on BMP9-induced osteogenic and adipogenic differentiation, as well as Wnt/β-catenin signaling.

Results: LCN2 was down-regulated by BMP9. The BMP9-induced osteogenic markers were inhibited by LCN2 overexpression, but the adipogenic markers were increased; LCN2 knockdown exhibited opposite effects. Similar results were found in bone defect repair and fetal limb culture tests. The level of β-catenin nucleus translocation was found to be reduced by LCN2 overexpression, but increased by LCN2 knockdown. The inhibitory effect of LCN2 overexpression on the osteogenic capability of BMP9 was reversed by β-catenin overexpression; whereas, the effect of LCN2 knockdown on promoting BMP9 osteogenic potential was almost eliminated by β-catenin knockdown. LCN2 could bind with LRP6 specifically, and the inhibitory effect of LCN2 on the osteogenic potential of BMP9 could not be enhanced by LRP6 knockdown.

Conclusion: LCN2 inhibits the BMP9-induced osteogenic differentiation but promotes its adipogenic potential in MEFs, which may be partially mediated by reducing Wnt/β-catenin signaling via binding with LRP6.

Keywords: Lipocalin-2, bone morphogenetic protein 9, osteogenic differentiation, low-density lipoprotein receptor-related protein 6, Wnt/β-catenin, MSCs.

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