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NEURONAL CONTROL OF CILIARY LOCOMOTION IN A GASTROPOD VELIGER (CALLIOSTOMA)
The Biological Bulletin
|January 11, 2018
Summary
This study reveals how the marine snail Calliostoma ligatum uses electrical signals in ciliated cells to control movement. Neuronal input triggers distinct ciliary actions for locomotion and feeding behaviors.
Area of Science:
- Marine biology
- Neurobiology
- Cellular physiology
Background:
- Ciliary locomotion is crucial for marine invertebrate larvae.
- Neuronal control mechanisms for ciliary beating are not fully understood.
- Calliostoma ligatum veligers offer a model for studying ciliary control.
Purpose of the Study:
- To investigate the neuronal control of ciliary locomotion in Calliostoma ligatum veligers.
- To elucidate the electrical properties of pre-oral ciliated cells during locomotion.
- To identify the cellular mechanisms underlying different ciliary-based behaviors.
Main Methods:
- Intracellular recordings from pre-oral ciliated cells of Calliostoma ligatum veligers.
- Analysis of membrane potential oscillations and spiking activity during ciliary beating.
- Investigation of calcium-dependent action potentials and slow depolarizations.
- Assessment of electrical coupling between ciliated cells.
Main Results:
- Resting membrane potential of pre-oral ciliated cells is approximately -60 mV.
- Excitatory input from the central nervous system induces two types of locomotory behavior.
- Ciliary arrests are mediated by propagated, Ca++-dependent action potentials.
- Slowing of ciliary beating results from slow depolarization.
- Pre-oral ciliated cells exhibit electrical coupling.
Conclusions:
- Neuronal signals precisely control ciliary locomotion and feeding in Calliostoma ligatum veligers.
- Electrical properties of ciliated cells, including action potentials and slow depolarizations, dictate ciliary behavior.
- Electrical coupling ensures coordinated ciliary activity for effective locomotion and feeding.
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