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Calcium action potentials in retinal bipolar neurons

D Zenisek¹, G Matthews

¹Department of Neurobiology and Behavior, State University of New York, Stony Brook 11794-5230, USA.

Visual Neuroscience

|February 11, 1998

Summary

Spontaneous calcium action potentials in goldfish retinal bipolar neurons

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Area of Science:

Neuroscience
Retinal Physiology
Cellular Electrophysiology

Background:

Bipolar neurons are key retinal interneurons transmitting visual information.
Understanding their electrical properties is crucial for visual processing.
Spontaneous activity in bipolar neurons remains an area of investigation.

Purpose of the Study:

To investigate the electrical excitability of goldfish retinal bipolar neurons.
To identify the mechanisms underlying spontaneous intracellular calcium increases in these neurons.
To elucidate the role of calcium action potentials in bipolar neuron function.

Main Methods:

Patch-clamp recordings (whole-cell and perforated-patch) were employed.
Calcium-indicator measurements were utilized to monitor intracellular calcium.
Pharmacological agents and neurotransmitters (GABA, glutamate) were applied.

Main Results:

Spontaneous, large, transient increases in intracellular calcium were observed in the synaptic terminals, but not the soma, of bipolar neurons.
These calcium transients were inhibited by hyperpolarization, calcium-channel blockers, GABA, and glutamate.
Electrical recordings confirmed calcium-dependent action potentials in the synaptic terminals.
Regenerative depolarization via calcium channel opening was identified.

Conclusions:

Spontaneous calcium action potentials occur in the synaptic terminals of goldfish retinal bipolar neurons.
These calcium action potentials are responsible for spontaneous intraterminal calcium increases.
This mechanism likely serves as an amplification system in the visual ON pathway of the dark-adapted retina.

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