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Updated: Oct 21, 2025
A 3D System for Culturing Human Articular Chondrocytes in Synovial Fluid
Published on: January 31, 2012
General Caspase Inhibition in Primary Chondrogenic Cultures Impacts Their Transcription Profile Including
Barbora Vesela1,2, Martina Zapletalova2, Eva Svandova1,2
1Department of Physiology, University of Veterinary Sciences, Brno, Czech Republic.
Objective:
The knowledge about functions of caspases, usually associated with cell death and inflammation, keeps expanding also regarding cartilage. Active caspases are present in the growth plate, and caspase inhibition in limb-derived chondroblasts altered the expression of osteogenesis-related genes. Caspase inhibitors were reported to reduce the severity of cartilage lesions in osteoarthritis (OA), and caspase-3 might represent a promising biomarker for OA prognosis. The objective of this investigation was to decipher the transcriptomic regulation of caspase inhibition in chondrogenic cells.
Design:
Limb-derived chondroblasts were cultured in the presence of 2 different inhibitors: Z-VAD-FMK (FMK) and Q-VD-OPH (OPH). A whole transcriptome RNA sequencing was performed as the key analysis.
Results:
The analysis revealed a statistically significant increase in the expression of 252 genes in the FMK samples and 163 genes in the OPH samples compared with controls. Conversely, there was a significant decrease in the expression of 290 genes in the FMK group and 188 in the OPH group. Among the top up- and downregulated genes (more than 10 times changed), almost half of them were associated with OA. Both inhibitors displayed the highest upregulation of the inflammatory chemokine Ccl5, the most downregulated gene was the one for mannose receptors Mrc1.
Conclusions:
The obtained datasets pointed to a significant impact of caspase inhibition on the expression of several chondro-/osteogenesis-related markers in an in vitro model of endochondral ossification. Notably, the list of these genes included some encoding for factors associated with cartilage/bone pathologies such as OA.
Insights
Caspase inhibition impacts gene expression in cartilage cells, influencing pathways relevant to osteoarthritis (OA). This study reveals how inhibiting caspases affects chondrogenesis and osteogenesis-related genes in vitro.
Area of Science:
- Biochemistry
- Molecular Biology
- Cell Biology
Background:
- Caspases, enzymes typically linked to cell death and inflammation, have expanding roles in cartilage biology.
- Active caspases are found in the growth plate, and their inhibition affects osteogenesis-related gene expression in chondroblasts.
- Caspase inhibitors show potential in reducing osteoarthritis (OA) severity, with caspase-3 as a possible OA biomarker.
Purpose of the Study:
- To investigate the transcriptomic regulation of caspase inhibition in chondrogenic cells.
- To understand the impact of caspase inhibition on gene expression related to cartilage and bone development.
- To identify specific genes and pathways affected by caspase inhibition in an in vitro model.
Main Methods:
- Primary chondroblasts derived from limbs were cultured.
- Cells were treated with two distinct caspase inhibitors: Z-VAD-FMK (FMK) and Q-VD-OPH (OPH).
- Whole transcriptome RNA sequencing was employed for comprehensive gene expression analysis.
Main Results:
- Significant alterations in gene expression were observed: FMK increased 252 genes and decreased 290; OPH increased 163 genes and decreased 188.
- Approximately half of the top upregulated and downregulated genes (over 10-fold change) were associated with osteoarthritis (OA).
- Both inhibitors markedly upregulated the inflammatory chemokine Ccl5, while Mrc1 (mannose receptor) was the most downregulated gene.
Conclusions:
- Caspase inhibition significantly impacts the expression of chondro- and osteogenesis-related markers in an in vitro model of endochondral ossification.
- The identified gene expression changes highlight the role of caspases in regulating cartilage and bone development.
- The findings suggest that targeting caspases could be a therapeutic strategy for cartilage and bone pathologies like OA.
