Skip to main content
Article
Bone Cell Autophagy is Regulated by Environmental Factors
Cells, Tissues, Organs
  • Adam M. Zahm, Children’s Hospital of Philadelphia
  • Jolene Bohensky, Philadelphia College of Osteopathic Medicine
  • Christopher S. Adams, Philadelphia College of Osteopathic Medicine
  • Irving M. Shapiro, Thomas Jefferson University
  • Vickram Srinivas, Thomas Jefferson University
Document Type
Article
Publication Date
5-1-2011
Abstract

The goal of this investigation was to ascertain whether bone cells undergo autophagy and to determine if this process is regulated by environmental factors. We showed that osteocytes in both murine and human cortical bone display a punctuate distribution of microtubule-associated protein light chain 3, indicative of autophagy. In addition, we noted a basal level of autophagy in preosteocyte-like murine long bone-derived osteocytic (MLO)-A5 cells. Autophagy was upregulated following nutrient deprivation and hypoxic culture, stress conditions that osteocytes encounter in vivo. Furthermore, in response to calcium stress, the transcription factor hypoxia inducible factor 1 regulated MLO-A5 autophagy. Finally, we showed that the more differentiated MLO-Y4 osteocyte-like cells exhibited a significant basal autophagic flux. Based on these findings, we suggest that raising the level of autophagic flux is a mechanism by which differentiated bone cells survive in a stressful environment.

PubMed ID
21597271
Comments

This article was published in Cells Tissues Organs, Volume 194, Issue 2-4, May 2011, pages 274–278.

The published version is available at http://dx.doi.org/10.1159/000324647.

Copyright © 2011 S. Karger AG, Basel.

Citation Information
Adam M. Zahm, Jolene Bohensky, Christopher S. Adams, Irving M. Shapiro, et al.. "Bone Cell Autophagy is Regulated by Environmental Factors" Cells, Tissues, Organs Vol. 194 Iss. 2-4 (2011) p. 274 - 278
Available at: http://works.bepress.com/christopher_adams/3/