Post-tetanic potentiation

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Post-tetanic potentiation (PTP) is a form of synaptic plasticity which is short-lived and results in increased frequency of miniature excitatory postsynaptic potentials (mEPSPs) or currents (EPSCs) with no effect on amplitude in the spontaneous postsynaptic potential.[1] It usually lasts in the range of several minutes (shorter potentiations are usually referred to as 'augmentations'). PTPs are observed when synapses are stimulated with repetitive (tetanic) pulses, by means of prolonged trains of stimuli applied at high frequencies (10 Hz to 200 Hz stimuli applied for .2 seconds to 5 seconds).[2]

PTPs are thought to result primarily from the buildup of calcium concentration in the axon terminal of the presynaptic neuron during the stimulus train.[2] However, this is a topic under debate[3] as changes that last this long outlive the rate at which calcium is transported out of the presynaptic neuron.

In some cases, depression can be observed instead of potentiation following the tetanic stimulus.[2]

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  1. ^ Bao, Jian-Xin; Kandel, Eric R.; Hawkins, Robert D. (1997). "Involvement of Pre- and Postsynaptic Mechanisms in Posttetanic Potentiation at Aplysia Synapses ". Science Online. 275 (5302): 969–973. doi:10.1126/science.275.5302.969. PMID 9020078. S2CID 29442343.
  2. ^ a b c Malenka, Robert C. Neuropsychopharmacology: The Fifth Generation of Progress. pp. 147–154.
  3. ^ Mahapatra, Satyajit; Lou, Xuelin (May 2016). "Dynamin-1deletion enhances post-tetanic potentiation and quantal size after tetanic stimulation at the calyx of held". The Journal of Physiology. 595 (1): 193–206. doi:10.1113/JP271937. PMC 5199734. PMID 27229184.