Impaired Bone Formation in Pdia3 Deficient Mice

Authors

Yun Wang, Georgia Institute of Technology
Alexandr Nizkorodov, Georgia Institute of Technology
Kelsie Riemenschneider, Georgia Institute of Technology
Christopher S. D. Lee, Georgia Institute of Technology
Rene Olivares-Navarrete, Virginia Commonwealth UniversityFollow
Zvi Schwartz, Virginia Commonwealth UniversityFollow
Barbara D. Boyan, Virginia Commonwealth University, Georgia Institute of TechnologyFollow

Document Type

Article

Original Publication Date

2014

Journal/Book/Conference Title

PLoS ONE

Volume

9

Issue

11

DOI of Original Publication

10.1371/journal.pone.0112708

Comments

Originally published at http://dx.doi.org/10.1371/journal.pone.0112708

Date of Submission

November 2015

Abstract

1α,25-dihydroxyvitamin D3 [1α,25(OH)2D3] is crucial for normal skeletal development and bone homeostasis. Protein disulfide isomerase family A, member 3 (PDIA3) mediates 1α,25(OH)2D3initiated-rapid membrane signaling in several cell types. To understand its role in regulating skeletal development, we generated Pdia3-deficient mice and examined the physiologic consequence of Pdia3-disruption in embryos and Pdia3+/− heterozygotes at different ages. No mice homozygous for the Pdia3-deletion were found at birth nor were there embryos after E12.5, indicating that targeted disruption of the Pdia3 gene resulted in early embryonic lethality.Pdia3-deficiency also resulted in skeletal manifestations as revealed by µCT analysis of the tibias. In comparison to wild type mice, Pdia3 heterozygous mice displayed expanded growth plates associated with decreased tether formation. Histomorphometry also showed that the hypertrophic zone in Pdia3+/− mice was more cellular than seen in wild type growth plates. Metaphyseal trabecular bone in Pdia3+/− mice exhibited an age-dependent phenotype with lower BV/TV and trabecular numbers, which was most pronounced at 15 weeks of age. Bone marrow cells from Pdia3+/− mice exhibited impaired osteoblastic differentiation, based on reduced expression of osteoblast markers and mineral deposition compared to cells from wild type animals. Collectively, our findings provide in vivo evidence that PDIA3 is essential for normal skeletal development. The fact that the Pdia3+/− heterozygous mice share a similar growth plate and bone phenotype to nVdr knockout mice, suggests that PDIA3-mediated rapid membrane signaling might be an alternative mechanism responsible for 1α,25(OH)2D3’s actions in regulating skeletal development.

Rights

Copyright: 2014 Wang et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Is Part Of

VCU Biomedical Engineering Publications