Induction of Long-Term Depression in Cerebellar Purkinje Neurons in a Mouse Brain Slice

0 weergaven2:24 min • July 8th, 2025

Begin with a mouse cerebellar brain slice containing parallel fibers, climbing fibers and Purkinje cells, essential for motor control.

The slice is submerged in an artificial cerebrospinal fluid, with a recording electrode attached to a Purkinje cell and stimulating electrodes near the parallel and climbing fibers.

Apply electrical stimuli to the parallel fibers, prompting the release of glutamate, an excitatory neurotransmitter near the Purkinje cell.

The neurotransmitters bind to the glutamate receptors, leading to ion influx that activates the Purkinje cells and generates an electrical signal.

Adjust the stimulus intensity for an optimum response from the Purkinje cells.

Next, deliver repetitive stimulations to the climbing and parallel fibers.

The climbing fiber stimuli activate voltage-gated calcium channels on the Purkinje cell, causing a significant calcium influx.

This triggers the internalization of glutamate receptors, reducing the cell's sensitivity to glutamate.

This induces long-term depression, characterized by a diminished response to parallel fiber stimulation.

For long term depression induction, stimulate the molecular layer with a 0.1 millisecond pulse, and apply a double pulse stimulus to identify the parallel fiber excitatory postsynaptic currents. A paired pulse facilitation and gradual increase in amplitude relative to the increase in stimulation intensity should be observed. To record the test response, apply a single 0.1 hertz pulse, and adjust the intensity of the stimulus so that the evoked amplitude is around 200 picoamps.

Stimulate the climbing fibers at the bottom of the Purkinje cell layer, and to identify the parallel fiber excitatory postsynaptic currents elicited by the climbing fiber activation, apply a double pulse stimulus. A paired pulse depression should be observed in an all or none manner, in correlation with the increase in stimulation intensity.

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Laatst bijgewerkt: 29 augustus 2026