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Updated: Mar 8, 2026
Skeletal Phenotype Analysis of a Conditional Stat3 Deletion Mouse Model
Published on: July 3, 2020
A Conditional Knockout Mouse Model Reveals a Critical Role of PKD1 in Osteoblast Differentiation and Bone Development
Shao Li1, Wanfu Xu1, Zhe Xing1
1Department of Cell Biology, School of Basic Medical Sciences, Southern Medical University, Guangzhou 510515, P. R. China.
Abstract:
The protein kinase D family of serine/threonine kinases, particularly PKD1, has been implicated in the regulation of a complex array of fundamental biological processes. However, its function and mechanism underlying PKD1-mediated the bone development and osteoblast differentiation are not fully understood. Here we demonstrate that loss of PKD1 function led to impaired bone development and osteoblast differentiation through STAT3 and p38 MAPK signaling using in vitro and in vivo bone-specific conditional PKD1-knockout (PKD1-KO) mice models. These mice developed markedly craniofacial dysplasia, scapula dysplasia, long bone length shortage and body weight decrease compared with wild-type littermates. Moreover, deletion of PKD1 in vivo reduced trabecular development and activity of osteoblast development, confirmed by Micro-CT and histological staining as well as expression of osteoblastic marker (OPN, Runx2 and OSX). Mechanistically, loss of PKD1 mediated the downregulation of osteoblast markers and impaired osteoblast differentiation through STAT3 and p38 MAPK signaling pathways. Taken together, these results demonstrated that PKD1 contributes to the osteoblast differentiation and bone development via elevation of osteoblast markers through activation of STAT3 and p38 MAPK signaling pathways.
Insights
Protein kinase D1 (PKD1) is crucial for bone development and osteoblast differentiation. Loss of PKD1 impairs bone formation by downregulating key osteoblast markers via STAT3 and p38 MAPK signaling pathways.
Area of Science:
- Biochemistry
- Molecular Biology
- Skeletal Biology
Background:
- Protein kinase D (PKD) family, especially PKD1, regulates vital biological processes.
- The specific role and mechanisms of PKD1 in bone development and osteoblast differentiation remain unclear.
Purpose of the Study:
- To elucidate the function and molecular mechanisms of PKD1 in regulating bone development and osteoblast differentiation.
Main Methods:
- Utilized in vitro and in vivo bone-specific conditional PKD1-knockout (PKD1-KO) mice models.
- Evaluated bone development through Micro-CT, histological staining, and assessment of osteoblastic markers (OPN, Runx2, OSX).
Main Results:
- PKD1-KO mice exhibited craniofacial and scapula dysplasia, shortened long bones, and reduced body weight.
- PKD1 deletion led to decreased trabecular bone development and osteoblast activity.
- Loss of PKD1 resulted in downregulation of osteoblast markers via STAT3 and p38 MAPK signaling.
Conclusions:
- PKD1 is essential for normal bone development and osteoblast differentiation.
- PKD1 promotes osteoblast differentiation and bone formation by activating STAT3 and p38 MAPK signaling pathways, thereby upregulating osteoblast markers.
