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Updated: Oct 1, 2026

Assessment of Long-term Depression Induction in Adult Cerebellar Slices
Published on: October 16, 2019
A new form of cerebellar long-term potentiation is postsynaptic and depends on nitric oxide but not cAMP
Varda Lev-Ram1, Scott T Wong, Daniel R Storm
1Department of Pharmacology, The Howard Hughes Medical Institute, University of California at San Diego, La Jolla, CA 92093-0647, USA.
Abstract:
Long-term depression (LTD) at cerebellar parallel fiber (PF)-Purkinje cell synapses must be balanced by long-term potentiation (LTP) to prevent saturation and allow reversal of motor learning. The only previously analyzed form of cerebellar LTP is induced by 4-8 Hz PF stimulation and requires cAMP but not nitric oxide. It is a poor candidate to reverse LTD because it is presynaptically expressed whereas LTD is postsynaptic. We now characterize a new form of LTP induced by 1 Hz PF stimulation for at least 300 s. This LTP is postsynaptically expressed, enhanced by chelating postsynaptic Ca(2+), and depends on nitric oxide but not cAMP or cGMP, making it a plausible anti-Hebbian counterpart to Hebbian LTD.
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