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Bone Cells and Tissue01:30

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Bones contain a relatively small number of cells entrenched in a matrix of organic and inorganic components. Although bone cells compose only a small amount of the bone volume, they are crucial to its function. Four types of cells are found within the bone tissue— osteoblasts, osteocytes, osteogenic cells, and osteoclasts.
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The endocrine system produces and secretes hormones, which interact with the skeletal system. These hormones control bone growth, maintain bone once it is formed, and remodel it.
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Chondrocytes form a temporary cartilaginous model by dividing and secreting a thick gel-like extracellular matrix. Once the chondrocytes undergo programmed cell death, osteoblasts enter the site of the cartilaginous model. The process of replacing the temporary cartilaginous model with bone in an ordered manner is called endochondral ossification. In endochondral ossification, not all of the cartilage is replaced by bone tissue. Some cartilage that performs a protective and supportive function...
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Machines01:19

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Machines are complex structures consisting of movable, pin-connected multi-force members that work together to transmit forces. One example of a machine is the cutting plier, which is used to cut wires by applying forces to its handles. When equal and opposite forces are exerted on the handles of the cutting plier, they cause the cutting edges to come together and apply equal and opposite reaction forces on the wire, which are greater than the applied forces.
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Random or indeterminate errors originate from various uncontrollable variables, such as variations in environmental conditions, instrument imperfections, or the inherent variability of the phenomena being measured. Usually, these errors cannot be predicted, estimated, or characterized because their direction and magnitude often vary in magnitude and direction even during consecutive measurements. As a result, they are difficult to eliminate. However, the aggregate effect of these errors can be...
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Changes in Human Foetal Osteoblasts Exposed to the Random Positioning Machine and Bone Construct Tissue Engineering.

Vivek Mann1, Daniela Grimm2,3, Thomas J Corydon4,5

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Simulated microgravity using a Random Positioning Machine (RPM) promotes 3D bone construct formation from human osteoblasts. This technology aids research into spaceflight bone loss and diseases like osteonecrosis.

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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.