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Cellular mechanism for the temperature sensitive spatial orientation in Clione
1Institute of Problems of Information Transmission, Russian Academy of Science, Moscow State University.
Neuroreport
|November 14, 1997
Summary
Warming temperatures disrupt the swimming mollusk Clione's orientation by altering signals from statocyst receptors (SRCs) to CPB3 interneurons. This neurophysiological change affects motor control, impacting the mollusk's spatial awareness.
Area of Science:
- Neuroscience
- Marine Biology
- Animal Behavior
Background:
- The marine mollusk Clione exhibits vertical orientation, which is sensitive to water temperature.
- CPB3 interneurons are crucial for spatial orientation, relaying signals from statocyst receptors (SRCs) to tail motoneurons.
Purpose of the Study:
- To investigate the neurophysiological mechanisms underlying temperature-sensitive orientation changes in Clione.
- To understand how warming affects CPB3 interneuron function and synaptic transmission from SRCs.
Main Methods:
- Electrophysiological recordings were used to study CPB3b interneurons in Clione.
- Intracellular stimulation of the rostro-dorsal SRC (DSRC) was performed at different temperatures.
- Synaptic potentials (PSPs) and membrane potential changes in CPB3b were analyzed.
Main Results:
- Warming caused strong depolarization of CPB3 interneurons.
- Excitation of CPB3b by DSRC stimulation decreased with warming, sometimes reversing to inhibition.
- The reversal potential of PSPs became closer to, or exceeded, the depolarized membrane potential at higher temperatures.
Conclusions:
- Temperature-induced depolarization of CPB3 interneurons alters synaptic integration, explaining Clione's altered orientation.
- The interplay between PSP reversal potential and membrane potential shifts provides a mechanism for thermosensation in Clione's spatial orientation.