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Published on: September 11, 2015
Mechanisms of fluid-flow-induced matrix production in bone tissue engineering
H L Morris1, C I Reed, J W Haycock
1Department of Engineering Materials, Kroto Research Institute, University of Sheffield, Broad Lane, UK.
Fluid flow stimulates bone matrix production, with hyaluronan (HA) and CD44 mediating this process in tissue engineering. These molecules are crucial for collagen production but not short-term NF-kappaB activation.
Area of Science:
- Biomaterials Science
- Cell Biology
- Tissue Engineering
Background:
- Mechanical forces enhance matrix production in bone tissue engineering.
- Molecular mechanisms of flow-induced signaling in bone are not fully understood.
- Hyaluronan (HA) glycocalyx is a potential mediator of mechanical forces in bone.
Purpose of the Study:
- Investigate the role of HA in flow-induced collagen production and NF-kappaB activation.
- Determine the involvement of CD44 in mechanotransduction pathways.
Main Methods:
- Utilized a parallel-plate flow chamber for MLO-A5 osteoid osteocytes.
- Assessed effects of enzymatic HA removal and CD44 antibody blocking.
- Measured collagen production and NF-kappaB (p65) translocation.
Main Results:
- Short-term fluid flow increased collagen production and NF-kappaB p65 nuclear translocation.
- HA removal and CD44 blocking abolished flow-induced collagen increase.
- Neither HA nor CD44 affected short-term NF-kappaB p65 translocation.
Conclusions:
- HA and CD44 mediate flow-induced collagen production in long-term bone cultures.
- Multiple signaling events are initiated by fluid flow.
- Findings inform bioreactor design for enhanced bone tissue engineering.
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