Crickets in space: morphological, physiological and behavioral alterations induced by space flight and hypergravity.

Area of Science:

• Neuroscience
• Space Biology
• Developmental Biology

Background:

• Understanding how gravity affects nervous system development is crucial for space exploration.
• Crickets (Acheta domesticus) were used as a model organism due to their gravity-sensitive neuronal systems.

Purpose of the Study:

• To investigate the balance between genetic programs and gravitational environment on neuronal development.
• To assess the impact of microgravity and hypergravity on cricket behavior and neurophysiology.

Main Methods:

• Exposure of cricket eggs and larvae to microgravity and 3g hypergravity.
• Behavioral analysis, immunocytology of GABAergic motoneurons, and examination of neuromuscular junctions.
• Physiological assessment of position-sensitive interneurons (PSI).

Main Results:

• Cricket behavior showed low susceptibility to altered gravity, but PSI physiology was significantly affected.
• Thoracic motoneurons exhibited stage-dependent sensitivity in soma size under 3g, but not topographical arrangement.
• No significant modifications were observed in peptidergic neurons under microgravity.

Conclusions:

• Specific neuronal systems, like PSI, are sensitive to altered gravity during development.
• Anatomical modifications were absent, suggesting a critical time window for gravity exposure during neuronal proliferation.
• Further research is needed to understand adaptation mechanisms to altered gravitational conditions.