Neurobiological and neurophysiological impacts of real spaceflight and simulated microgravity on C. elegans: a comprehensive review.
Shakir MZ, Wang N, Usmani MW, Ullah I, Liu J
Space Biology
Space biology research on how gravity shapes living cells is quietly informing how scientists think about gravity-sensing in plant roots and shoots — the same gravitropism that makes your seedlings reach up and their roots push down.
Scientists reviewed a large body of research using a tiny worm to understand what happens to the nervous system during spaceflight. Without normal gravity, the worm's nerve cells grow extra, tangled branches, can't clear out cellular junk properly, and lose their ability to send the right chemical signals. The findings help explain why long space missions could harm astronaut brain health — and give scientists a simple animal model to test possible fixes.
Key Findings
Microgravity causes dendritic hyperbranching and self-avoidance defects in neurons, disrupting sensory integration and receptive field structure.
Neuronal waste clearance via exopher pathways becomes less effective under microgravity, leading to proteostatic overload and neuronal stress.
Dopamine and acetylcholine signaling are notably disrupted, with serotonergic and GABA systems also showing vulnerabilities, collectively impairing locomotion and behavioral flexibility.
chevron_right Technical Summary
Researchers reviewed how weightlessness in space disrupts the nervous system of C. elegans, a tiny roundworm used as a stand-in for studying biology. They found that microgravity warps neuron structure, overwhelms the brain's waste-disposal system, and scrambles chemical signals that control movement and behavior.
Abstract Preview
The modern phase of human exploration highlights the critical need to understand and mitigate the effects of spaceflight on the human body. Since the first lunar missions, prolonged exposure to mic...
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