Changes in Human Foetal Osteoblasts Exposed to the Random Positioning Machine and Bone Construct Tissue Engineering.

Area of Science:

• Biotechnology
• Cell Biology
• Space Medicine

Background:

• Human cells form 3D tissue constructs in microgravity.
• Simulated microgravity (s-µg) offers a platform to study cellular behavior.
• Osteoblast function is crucial for bone health and regeneration.

Purpose of the Study:

• Investigate s-µg effects on human fetal osteoblast (hFOB 1.19) cells.
• Engineer 3D bone constructs using simulated microgravity.
• Analyze cellular and molecular changes induced by s-µg.

Main Methods:

• hFOB 1.19 cells cultured on a Random Positioning Machine (RPM) for 7 and 14 days.
• Analysis of cytoskeleton, cell adhesion, extracellular matrix (ECM), and multicellular spheroid (MCS) formation.
• Gene expression profiling and cytokine/biomarker release assessment.

Main Results:

• RPM exposure altered cytoskeleton, cell adhesion, ECM, and induced 3D multicellular spheroid formation.
• Differential gene expression observed for key bone-related genes (e.g., TGFB1, BMP2, COL1A1).
• Altered release of bone biomarkers (SOST, OC, OPG) and cytokines (IL-1β, TNF-1α).
• Two-week RPM exposure resulted in bone-specific spheroid morphology.

Conclusions:

• Culturing cells in s-µg is a novel approach for bone tissue engineering.
• This method can elucidate mechanisms of spaceflight-induced bone loss.
• Potential applications in studying bone diseases like osteonecrosis and bone injuries.