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Neutral Buoyancy as a Simple Approach to Simulated Microgravity
Ho Yong Kim1, Sungwook Kang2, Se Heang Oh3,4
1Department of Nanobiomedical Science, Dankook University, Cheonan, 31116, Republic of Korea.
Tissue Engineering and Regenerative Medicine
|January 13, 2026
Summary
A new neutral buoyancy system simulates microgravity for cell research. This low-cost method maintains human mesenchymal stem cell stemness and influences differentiation, offering an accessible platform for space biology studies.
Area of Science:
- Biotechnology and Biomedical Engineering
- Cell Biology and Stem Cell Research
- Space Biology and Astrobiology
Background:
- Microgravity research is crucial for understanding biological phenomena but faces limitations in cost, accessibility, and accurate simulation.
- Existing ground-based simulators often introduce artifacts like shear stress and vibration, hindering realistic microgravity replication.
- A need exists for simple, low-cost, and reproducible simulated microgravity systems.
Purpose of the Study:
- To develop a simple, low-cost, and reproducible simulated microgravity system using neutral buoyancy.
- To assess the stability of human bone marrow-derived mesenchymal stem cell (hBMSC) spheroids in the simulated environment.
- To investigate the effects of neutral buoyancy-simulated microgravity on hBMSC stemness and trilineage differentiation.
Main Methods:
- Created a neutral buoyancy medium (NBM) by mixing cell culture medium with density gradient media (Ficoll-Paque™, Percoll™, Optiprep™).
- Evaluated the buoyancy stability of hBMSC spheroids experimentally and through computational fluid dynamics (CFD).
- Compared the effects of the 3D-simulated microgravity (3D-sim-μg) on hBMSC stemness and differentiation against normal gravity controls.
Main Results:
- An Optiprep-based NBM (20/80 v/v) provided stable suspension for hBMSC spheroids for up to 14 days.
- CFD analysis confirmed near-zero static pressure, validating the microgravity-like environment.
- hBMSC spheroids in 3D-sim-μg exhibited enhanced pluripotency marker expression, suppressed osteogenic differentiation, and increased adipogenic and chondrogenic differentiation compared to normal gravity.
Conclusions:
- The neutral buoyancy-based system effectively simulates microgravity-induced cellular behaviors, including stemness maintenance and lineage-specific differentiation.
- This approach offers a simple, accessible, and reproducible platform for diverse microgravity research.
- The findings support the utility of this system for studying cellular responses in simulated space environments.
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