AccScience Publishing / IJB / Online First / DOI: 10.36922/ijb.3959
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RESEARCH ARTICLE

Osteocytic PGE2 receptors EP2/4 signaling create a physiological osteogenic microenvironment in polycaprolactone 3D modules

Jingjing Chen1 ,  Qiuling Guo1 ,  Jinling Zhang1 ,  Ying Zhang1 ,  Yangxi Liu1 ,  Pengtao Wang1 ,  Chengzhu Zhao1 ,  Linda F Bonewald2,3 * ,  Xiaolin Tu1,3 *
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1 Laboratory of Skeletal Development and Regeneration, Key Laboratory of Clinical Laboratory Diagnostics (Ministry of Education), College of Laboratory Medicine, Chongqing Medical University, Chongqing, China
2 Indiana Center for Musculoskeletal Health, Indiana University School of Medicine, Indianapolis, United States of America
3 Department of Anatomy, Cell Biology, and Physiology, School of Medicine, Indiana University, Indianapolis, United States of America
IJB, 3959 https://doi.org/10.36922/ijb.3959
Submitted: 17 June 2024 | Accepted: 6 August 2024 | Published: 8 August 2024
(This article belongs to the Special Issue Made-to-order Organ)
© 2024 by the Author(s). This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution 4.0 International License ( https://creativecommons.org/licenses/by/4.0/ )
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Abstract

3D bioprinting is a focused field in orthopedics, and its application with physiological osteogenic microenvironments (POMEs) is a prerequisite for authentic bone reconstruction. Mechanical stimulation produces prostaglandin E2 (PGE2) in mechanosensory osteocytes, but it remains unclear whether osteocytic PGE2 is a POME. PGE2 is an inducer of osteogenesis by acting on bone marrow stromal cells through its receptors EP2/EP4 to initiate osteogenic differentiation and mineralization. Unfortunately, clinical trials of PGE2 have reported side effects, including fever and drowsiness; targeting the PGE2 receptor in specific tissues can avoid these side effects. Here, we demonstrate that osteocytic cell line MLO-Y4 from murine long bones treated with EP2/EP4 agonists for 24 h enhance osteogenic differentiation and mineralization, inhibit adipogenesis of the stromal cell line ST2, and induce tubule formation and angiogenic marker expression in human umbilical vein endothelial cells (HUVECs). Mechanistically, activation of the PGE2 signaling pathway in osteocytes induces autocrine effects by upregulating the expression of EP2/EP4 receptors and COX-2 (Ptgs2), further amplifying PGE2 signaling. PGE2 produced by treated MLO-Y4 cells appears responsible for osteogenesis, alongside other unidentified factors. MLO-Y4 and ST2 cells, incorporated into POME 3D constructs, maintained over 95% viability over seven days. Treatment of osteocytes with a PGE2 receptor agonist promotes ST2 cell proliferation and enhances osteoblast marker expression and mineralization. As 3D bioprinting closely models in vivo conditions, these data suggest that osteocytic PGE2 receptor signaling is a safe and mild POME with great potential for translational applications.

 

Graphical abstract
Keywords
PGE2
Physiological osteogenic microenvironment
3D bioprinting
Osteogenic differentiation
Angiogenesis
Adipogenesis
Funding
This research was funded by the National Natural Science Foundation of China 82072450 (XL.T.), Chongqing Natural Science Foundation-Innovation and Development Joint Fund CSTB2022NSCQ-LZX0048 (XL.T.), and Young Scientists Fund of the National Natural Science Foundation of China 82202655 (C.Z.).
Conflict of interest
The authors declare that they have no competing interests.
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International Journal of Bioprinting, Electronic ISSN: 2424-8002 Print ISSN: 2424-7723, Published by AccScience Publishing
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