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Bone reports2023; 18; 101653; doi: 10.1016/j.bonr.2023.101653

Role of cartilage and bone matrix regulation in early equine osteochondrosis.

Abstract: The objective of this study is to better understand the pathogenesis of early equine osteochondrosis (OC) by identifying differences in gene and protein expression of extracellular matrix components and regulators in normal and diseased cartilage and bone, focusing on the osteochondral junction and cells surrounding the cartilage canals. We expected to find an upregulation of matrix metalloproteinases and a decrease in extracellular matrix constituent expression along the osteochondral junction and cells surrounding the cartilage canals in OC samples. Paraffin-embedded osteochondral samples (6 OC-affected, 8 normal controls) and cDNA from chondrocytes captured with laser capture microdissection from frozen sections (4 OC-affected, 5 normal controls) were used in this study. Quantitative real-time polymerase chain reaction was performed on 16 target genes. Immunohistochemistry was performed on osteochondral samples for Sox-9, lubricin, osteocalcin, and collagen type IIB. In OC-affected samples, there was significantly ( ≤ 0.05) decreased gene expression of collagen type IIB, aggrecan, and SOX-9 in chondrocytes surrounding the cartilage canals and decreased gene expression of PRG4 (Lubricin) and collagen type IIB in chondrocytes along the osteochondral junction. We found significantly lower collagen type IIB total matrix percentages in the middle and deep cartilage layers, lower lubricin total cellular percentage in the superficial layer, and higher Sox-9 total cellular percentage in bone of OC samples. No significant differences were found in matrix degradation molecules or HSCORE protein expression at any locations between normal and OC-affected samples in our study.
Publication Date: 2023-01-05 PubMed ID: 36632355PubMed Central: PMC9827356DOI: 10.1016/j.bonr.2023.101653Google Scholar: Lookup
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  • Journal Article

Summary

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This research sought to understand the progression of early equine osteochondrosis, a joint condition affecting horses, by studying genetic differences and protein expression in healthy and diseased cartilage and bone. The study expected to find increased levels of matrix metalloproteinases, enzymes instrumental in joint degradation, and reduced expression of extracellular matrix constituents in disease samples.

Research Methodology

  • The researchers utilized paraffin-embedded osteochondral samples from both horses affected by osteochondrosis and healthy horses. They also used cDNA gathered from chondrocytes (the cells that produce and maintain the cartilage matrix). These were obtained using laser capture microdissection from frozen sections.
  • 16 target genes were tested using quantitative real-time polymerase chain reaction, a lab technique used to detect, measure and compare gene expression levels.
  • Immunohistochemistry, a method used to visualize and identify the presence, abundance, and localisation of specific proteins, was performed on osteochondral samples using Sox-9 (a transcription factor, or protein that controls the rate of transcription of DNA to RNA), lubricin (a protein essential for joint lubrication), osteocalcin (a protein found in bone and dentin), and collagen type IIB (a particular type of collagen).

Key Findings

  • The study observed significant decreases in the gene expression of collagen type IIB, aggrecan (a component of cartilage), and SOX-9 in chondrocytes around the cartilage canals in samples affected by osteochondrosis.
  • Similarly, a decrease in gene expression of PRG4 (lubricin) and collagen type IIB was found in chondrocytes along the osteochondral junction. These junctions are areas of bone transition into cartilage.
  • They also observed lower collagen type IIB total matrix percentages in the middle and deep cartilage layers. Simultaneously, there was lower lubricin total cellular percentage in the superficial layer, and an increased Sox-9 total cellular percentage in bone of samples affected by osteochondrosis.
  • Conversely, the study did not find any significant differences in the presence or levels of matrix degradation molecules or HSCORE protein expression between normal and osteochondrosis-affected samples. HSCORE is a semi-quantitative method to measure protein expression.

Conclusion

  • This study highlighted a decrease in certain gene expressions and protein levels in cartilage and bone samples affected by early equine osteochondrosis. These findings indicate potential biomarkers for this disease and provide a deeper understanding of osteochondrosis’s genetic and cellular pathology in horses.

Cite This Article

APA
Grissom SK, Semevolos SA, Duesterdieck-Zellmer K. (2023). Role of cartilage and bone matrix regulation in early equine osteochondrosis. Bone Rep, 18, 101653. https://doi.org/10.1016/j.bonr.2023.101653

Publication

ISSN: 2352-1872
NlmUniqueID: 101646176
Country: United States
Language: English
Volume: 18
Pages: 101653
PII: 101653

Researcher Affiliations

Grissom, S K
  • Department of Clinical Sciences, Carlson College of Veterinary Medicine, Oregon State University, Corvallis, OR 97331, United States of America.
Semevolos, S A
  • Department of Clinical Sciences, Carlson College of Veterinary Medicine, Oregon State University, Corvallis, OR 97331, United States of America.
Duesterdieck-Zellmer, K
  • Department of Clinical Sciences, Carlson College of Veterinary Medicine, Oregon State University, Corvallis, OR 97331, United States of America.

Conflict of Interest Statement

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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Citations

This article has been cited 2 times.
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