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Osteogenic Potential of Caspases Related to Endochondral Ossification
Eva Janečková1,2, Petra Bíliková1, Eva Matalová1,3
1Department of Physiology, University of Veterinary and Pharmaceutical Sciences, Brno, Czech Republic.
Abstract:
Caspases have functions particularly in apoptosis and inflammation. Increasing evidence indicates novel roles of these proteases in cell differentiation, including those involved in osteogenesis. This investigation provides a complex screening of osteogenic markers affected by pan caspase inhibition in micromass cultures derived from mouse forelimbs. PCR Array analysis showed significant alterations in expression of 49 osteogenic genes after 7 days of inhibition. The largest change was a decrease in CD36 expression, which was confirmed at organ level by caspase inhibition in cultured mouse ulnae followed by CD36 immunohistochemical analysis. So far, available data point to osteogenic potential of pro-apoptotic caspases. Therefore, the expression of pro-apoptotic caspases (-3, -6, -7, -8, -9) within the growth plate of mouse forelimbs at the stage where the individual zones are clearly apparent was studied. Caspase-9 was reported in the growth plate for the first time as well as caspase-6 and -7 in the resting zone, caspase-7 in the proliferation, and caspase-6 and -8 in the ossification zone. For all caspases, there was a gradient increase in activation toward the ossification zone. The distribution of staining varied significantly from that of apoptotic cells, and thus, the results further support non-apoptotic participation of caspases in osteogenesis.
Insights
Pan caspase inhibition significantly alters osteogenic gene expression, notably decreasing CD36. Pro-apoptotic caspases are present in growth plates, suggesting non-apoptotic roles in osteogenesis.
Area of Science:
- Molecular Biology
- Developmental Biology
- Cell Biology
Background:
- Caspases are key regulators of apoptosis and inflammation.
- Emerging evidence highlights their roles in cell differentiation, including osteogenesis.
Purpose of the Study:
- To investigate the impact of pan caspase inhibition on osteogenic gene expression.
- To explore the localization and activation patterns of pro-apoptotic caspases in the developing bone growth plate.
Main Methods:
- PCR Array analysis of osteogenic genes in mouse forelimb micromass cultures.
- Inhibition of caspases in cultured mouse ulnae.
- Immunohistochemical analysis of CD36 expression.
- Localization and activation assessment of caspases (-3, -6, -7, -8, -9) in mouse forelimb growth plates.
Main Results:
- Pan caspase inhibition altered the expression of 49 osteogenic genes, with CD36 showing the most significant decrease.
- Caspase-9 was newly identified in the growth plate, alongside caspase-6 and -7 in the resting zone, caspase-7 in proliferation, and caspase-6 and -8 in ossification zones.
- Caspase activation increased towards the ossification zone, with distinct staining patterns compared to apoptotic cells.
Conclusions:
- Caspase activity is crucial for regulating osteogenic gene expression, including CD36.
- Pro-apoptotic caspases are present and activated in specific zones of the growth plate.
- These findings support a non-apoptotic role for caspases in osteogenesis.
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