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Microtubule self-organisation and its gravity dependence.
James Tabony1, Nicolas Glade, Cyril Papaseit
1Commissariat à l'Energie Atomique, Département de Biologie Moléculaire et Structurale, Laboratoire de Résonance Magnétique en Biologie Métabolique, D.S.V, C.E.A. Grenoble, Grenoble, France.
Advances in Space Biology and Medicine
|September 4, 2003
Summary
Gravity influences biological systems by affecting self-organization in simple biochemical reactions. Microtubule formation demonstrates gravity
Area of Science:
- Biochemistry
- Cell Biology
- Biophysics
Background:
- Gravity's molecular effects on biological systems are largely unknown.
- Non-linear chemical reactions far-from-equilibrium can self-organize via reaction-diffusion.
- Theoretical models suggest external fields, like gravity, influence self-organization morphology.
Purpose of the Study:
- To investigate gravity's role in the in vitro self-organization of microtubules.
- To experimentally demonstrate gravity sensitivity in a simple biochemical system.
Main Methods:
- Studied in vitro microtubule formation, a cellular skeleton component.
- Utilized low gravity conditions to observe self-organization dynamics.
- Developed numerical reaction-diffusion simulations based on microtubule chemical dynamics.
Main Results:
- Microtubule self-organization morphology depends on gravity at a critical early stage.
- Gravity's presence at the bifurcation time triggers the self-organizing process.
- Microscopic analysis reveals gravity interacts with concentration/density fluctuations.
Conclusions:
- Demonstrated a simple, two-molecule biochemical system is gravity-sensitive.
- Proposed these self-organization mechanisms explain gravity's cellular-level effects.
- Suggests potential implications for microtubule organization in space-based cell cultures.