Cited by 51Bone Metabolism and DiseasesChemokine receptors and signalingBone fractures and treatments

MCP-1 Expression Is Specifically Regulated During Activation of Skeletal Repair and Remodeling

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Wu, A. C., Morrison, N. A., Kelly, W. L., Forwood, M. R.·2013·Calcified Tissue International

Abstract

Monocyte chemotactic protein-1 (MCP-1) belongs to the CC chemokine superfamily and plays a critical role in the recruitment and activation of leukocytes during acute inflammation. We hypothesize that MCP-1 is also an important chemokine that regulates the recruitment and activation of bone cells required for skeletal repair and remodeling. We used the ulnar stress fracture (SFx) model, which allows investigation of focal remodeling with a known time course and precise anatomical location. SFx were created in the right ulna of female Wistar rats using cyclic end loading. Unloaded animals were used as a control. Rats were killed 4 h and 1, 4, 7, and 14 days after loading (n = 10/group); RNA was extracted and converted to cDNA for quantitative PCR analysis using TaqMan gene expression assays. Four hours after loading, MCP-1 gene expression was increased ~30-fold (P < 0.001), remained elevated at 24 h (~12-fold, P < 0.001), then declined by day 14. Relative to the contralateral limb, expression of the receptors CCR1 and CCR2 increased over the 14 days, being significant by 4 days for CCR1 and 14 days for CCR2 (P < 0.05). Other inflammation-related chemokines (RANTES, MIP1a) were not increased at these early time points. Using in situ hybridization and immunohistochemistry in separate animal groups (n = 5/group, control, days 1, 4, 7), MCP-1 mRNA and protein were localized in periosteal osteoblasts associated with woven bone formation at the fracture exit point but not in osteocytes adjacent to the SFx. These data support an important role for MCP-1 in the early phase of SFx repair and activated remodeling.

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  • In bones subjected to fatigue loading, viable osteocytes near apoptotic ones express high RANKL/OPG ratio and increased VEGF and CCL2, promoting increased local osteoclastogenesis.

    “For instance, in bones subjected to fatigue loading, viable osteocytes near the apoptotic ones express, besides high RANKL/OPG ratio, increased levels of vascular endothelial growth factor (VEGF) and monocyte chemoattractant protein-1 (CCL2) promoting an increase in local osteoclastogenesis [194, 195].”

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  1. Wise GE, Frazier-Bowers S, D'Souza RN (2002) Cellular, molecular, and genetic determinants of tooth eruption. Crit Rev Oral Biol Med 13 (4):323-334

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Authors
Wu, A. C., Morrison, N. A., Kelly, W. L., & Forwood, M. R.
Affiliations
Griffith University (AU)
Corresponding author
Forwood, M. R.
Venue
Calcified Tissue International
Published
2013-03-05
Volume
92
Issue
6
Pages
566-575
ISSN
  • 0171-967X (ISSN-L)
  • 1432-0827
OpenAlex
W2049290532
Cited by
51
References
31
Citations by year
2026: 2 · 2024: 3 · 2023: 3 · 2022: 3 · 2021: 6 · 2020: 6 · 2019: 4 · 2018: 1 · 2017: 5 · 2016: 4 · 2015: 4 · 2014: 8 · 2013: 2
FWCI
2.69
Type
journal article
Language
en
Open access
Locations
  • Calcified Tissue International (publishedVersion)
  • PubMed (publishedVersion)
  • Griffith Research Online (submittedVersion)
Funders
  • Griffith University
  • Medical Research Council
  • National Health and Medical Research Council (597481, 511187)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Bone Metabolism and Diseases
  • Health Sciences › Medicine › Oncology › Chemokine receptors and signaling
  • Health Sciences › Medicine › Epidemiology › Bone fractures and treatments
Keywords
MCP-1, bone remodeling, skeletal repair, CC chemokines, CCR1, CCR2, woven bone formation, fracture healing, chemokine expression, bone inflammation
MeSH terms
Animals, Disease Models, Animal, Enzyme-Linked Immunosorbent Assay, Female, Immunohistochemistry, Fractures, Stress, Bone Remodeling, Fracture Healing, Rats, Wistar, In Situ Hybridization, Chemokine CCL2, Reverse Transcriptase Polymerase Chain Reaction, Rats, Transcriptome, Real-Time Polymerase Chain Reaction

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