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Functional changes in the snail statocyst system elicited by microgravity.

Pavel M Balaban1, Aleksey Y Malyshev, Victor N Ierusalimsky

  • 1Institute of Higher Nervous Activity and Neurophysiology, Russian Academy of Sciences, Moscow, Russia.

Plos One
|April 12, 2011
PubMed
Summary
This summary is machine-generated.

Snails exposed to microgravity showed enhanced gravity responses and increased Helix pedal peptide gene expression upon return to Earth. This suggests conserved mechanisms for gravity sensing and adaptation across species.

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Area of Science:

  • Neuroscience
  • Gravitational Biology
  • Space Biology

Background:

  • Mollusk statocysts are gravity-sensing organs analogous to vertebrate systems.
  • They contain sensory hair cells and aid in compensatory reflexes.

Purpose of the Study:

  • To investigate the effects of microgravity exposure on snail behavior and statoreceptor function.
  • To analyze gene expression of Helix pedal peptide (HPep) and FMRFamide post-spaceflight.

Main Methods:

  • Terrestrial gastropod snails (Helix lucorum L. and Helix aspersa L.) were exposed to microgravity for 12-16 days.
  • Post-flight assessments included behavioral tests, isolated neural preparation analysis, and gene expression analysis (mRNA).

Main Results:

  • Post-flight snails exhibited faster re-orientation to gravity (negative gravitaxis) and enhanced sensitivity to acceleration.
  • Statoreceptor responses to tilt were direction-independent in post-flight snails, unlike controls.
  • Increased mRNA expression of the HPep gene was observed in statoreceptors of post-flight snails.

Conclusions:

  • Microgravity exposure upregulates statocyst function in snails, similar to vertebrates.
  • This highlights fundamental principles of gravisensing and adaptation to gravity changes.
  • Snails serve as a model for studying nervous system responses to altered gravity.