Cited by 266Bone Metabolism and DiseasesConnexins and lens biologyBone health and osteoporosis research

Cell autonomous requirement of connexin 43 for osteocyte survival: Consequences for endocortical resorption and periosteal bone formation

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Bivi, Nicoletta, Condon, Keith W, Allen, Matthew R, Farlow, Nathan, Passeri, Giovanni, Brun, Lucas R, Rhee, Yumie, Bellido, Teresita +1 more·2012·Journal of Bone and Mineral Research

Abstract

Connexin 43 (Cx43) mediates osteocyte communication with other cells and with the extracellular milieu and regulates osteoblastic cell signaling and gene expression. We now report that mice lacking Cx43 in osteoblasts/osteocytes or only in osteocytes (Cx43ΔOt mice) exhibit increased osteocyte apoptosis, endocortical resorption, and periosteal bone formation, resulting in higher marrow cavity and total tissue areas measured at the femoral mid-diaphysis. Blockade of resorption reversed the increased marrow cavity but not total tissue area, demonstrating that endocortical resorption and periosteal apposition are independently regulated. Anatomical mapping of apoptotic osteocytes, osteocytic protein expression, and resorption and formation suggests that Cx43 controls osteoclast and osteoblast activity by regulating osteoprotegerin and sclerostin levels, respectively, in osteocytes located in specific areas of the cortex. Whereas empty lacunae and living osteocytes lacking osteoprotegerin were distributed throughout cortical bone in Cx43ΔOt mice, apoptotic osteocytes were preferentially located in areas containing osteoclasts, suggesting that osteoclast recruitment requires active signaling from dying osteocytes. Furthermore, Cx43 deletion in cultured osteocytic cells resulted in increased apoptosis and decreased osteoprotegerin expression. Thus, Cx43 is essential in a cell-autonomous fashion in vivo and in vitro for osteocyte survival and for controlling the expression of osteocytic genes that affect osteoclast and osteoblast function. © 2012 American Society for Bone and Mineral Research

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  • Disruption in cell-to-cell communication between osteocytes may induce release of local proosteoclastogenic cytokines.

    “In addition, an increase in RANKL/OPG ratio expressed by osteocytes was also observed in connexin43-deficient rats, suggesting that a disruption in cell-to-cell communication between osteocytes may induce the release of local proosteoclastogenic cytokines [33, 196, 197].”
  • In connexin43-deficient rats, osteocytes show increased RANKL/OPG ratio.

    “In addition, an increase in RANKL/OPG ratio expressed by osteocytes was also observed in connexin43-deficient rats, suggesting that a disruption in cell-to-cell communication between osteocytes may induce the release of local proosteoclastogenic cytokines [33, 196, 197].”

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  1. [40]Riffenburgh RH Statistics in Medicine 2006 Academic Press 2nd ed.

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Authors
Bivi, N., Condon, K. W., Allen, M. R., Farlow, N., Passeri, G., Brun, L. R., Rhee, Y., Bellido, T., & Plotkin, L. I.
Affiliations
  • Indiana University Indianapolis (US)
  • University of Parma (IT)
  • National University of Rosario (AR)
  • Yonsei University (KR)
Corresponding author
Plotkin, Lilian I
Venue
Journal of Bone and Mineral Research
Published
2011-10-25
Volume
27
Issue
2
Pages
374-389
ISSN
  • 0884-0431 (ISSN-L)
  • 1523-4681
OpenAlex
W2090197092
Cited by
261
References
78
Citations by year
2026: 13 · 2025: 6 · 2024: 18 · 2023: 18 · 2022: 16 · 2021: 18 · 2020: 30 · 2019: 29 · 2018: 14 · 2017: 20 · 2016: 13 · 2015: 14 · 2014: 19 · 2013: 20 · 2012: 13
FWCI
6.71
Type
journal article
Language
en
Open access
Locations
  • Journal of Bone and Mineral Research (publishedVersion)
  • PubMed (publishedVersion)
  • Conicet (publishedVersion, cc-by-nc-sa)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
  • IUScholarWorks (Indiana University) (submittedVersion)
Funders
  • U.S. Department of Veterans Affairs (IK6 BX004596)
  • Indiana Clinical and Translational Sciences Institute
  • National Institutes of Health (1s10rr023710-01, AG13918, RR025761)
  • School of Medicine, Indiana University
  • National Institute on Aging (P01AG013918)
  • Fogarty International Center (R03TW006919)
  • National Institute of Diabetes and Digestive and Kidney Diseases (R01DK076007)
  • National Institute of Arthritis and Musculoskeletal and Skin Diseases (R01AR059357, K02AR002127, R01AR053643)
  • National Center for Research Resources (S10‐RR023710, UL1RR025761, RR-025761)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Bone Metabolism and Diseases
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Connexins and lens biology
  • Health Sciences › Medicine › Orthopedics and Sports Medicine › Bone health and osteoporosis research
Keywords
connexin 43, osteocyte survival, osteocyte apoptosis, periosteal bone formation, osteoprotegerin, sclerostin, osteoclast recruitment, cortical bone, intercellular communication
MeSH terms
Animals, Bone Resorption, Cell Survival, Femur, Glycoproteins, Models, Biological, Osteoblasts, Osteocytes, Osteogenesis, Periosteum, Apoptosis, Gene Deletion, Connexin 43, Intercellular Signaling Peptides and Proteins, Adaptor Proteins, Signal Transducing, Mice, RANK Ligand, X-Ray Microtomography

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