Chiho Kadota-Watanabe , Jinsook Suh , Zhenqing Liu , Eric Yin , Kate Lindsey , Isabelle Lao-Ngo , Byron Zhao , Jonathan H. Wu , In Won Chang , Reuben H. Kim , Ophir D. Klein , Christine Hong
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引用次数: 0
Abstract
p75NTR has emerged as a key regulator of skeletal development and bone homeostasis. To define its role, we characterized skeletal phenotypes in global and mesenchyme-specific p75NTR knockout mouse models. Global deletion of p75NTR resulted in postnatal growth retardation, decreased trabecular and cortical bone mass, and impaired growth plate architecture—hallmarks of an osteoporotic phenotype that persisted into adulthood. Conditional deletion of p75NTR in mesenchymal progenitor cells using Prx1-Cre recapitulated these skeletal deficits, confirming a cell-autonomous role in bone development. In vitro, bone marrow stromal cells (BMSCs) derived from p75NTR-deficient mouse exhibited diminished osteogenic differentiation capacity, reduced mineralization, and downregulation of key osteogenic genes. Transcriptomic profiling revealed significant suppression of the NGF-MAPK/AP-1 signaling axis in p75NTR-deficient BMSCs. Functional studies demonstrated that loss of p75NTR reduced JNK pathway activation and downstream epigenetic regulators, including Kdm4b and its target gene Dlx5. Overexpression of Kdm4b rescued mineralization defects and restored osteogenic gene expression in p75NTR-deficient BMSCs, establishing a mechanistic link between p75NTR signaling and osteoblast differentiation. These findings define the NGF–p75NTR–JNK–KDM4B–Dlx5 axis as a central regulatory pathway in postnatal bone growth and osteogenesis. Given the critical role of p75NTR in skeletal development and bone homeostasis, targeted modulation of this signaling cascade may represent a promising therapeutic approach for treating osteoporosis and other bone disorders.
Bone ReportsMedicine-Orthopedics and Sports Medicine
CiteScore
4.30
自引率
4.00%
发文量
444
审稿时长
57 days
期刊介绍:
Bone Reports is an interdisciplinary forum for the rapid publication of Original Research Articles and Case Reports across basic, translational and clinical aspects of bone and mineral metabolism. The journal publishes papers that are scientifically sound, with the peer review process focused principally on verifying sound methodologies, and correct data analysis and interpretation. We welcome studies either replicating or failing to replicate a previous study, and null findings. We fulfil a critical and current need to enhance research by publishing reproducibility studies and null findings.