Tissue plasminogen activator contributes to the late phase of LTP and to synaptic growth in the hippocampal mossy fiber pathway

Danny Baranes, Doron Lederfein, Van You Huang, Mary Chen, Craig H. Bailey, Eric R. Kandel

Research output: Contribution to journalArticlepeer-review

348 Scopus citations

Abstract

The expression of tissue plasminogen activator (tPA) is increased during activity-dependent forms of synaptic plasticity. We have found that inhibitors of tPA inhibit the late phase of long-term potentiation (L-LTP) induced by either forskolin or tetanic stimulation in the hippocampal mossy fiber and Schaffer collateral pathways. Moreover, application of tPA enhances L-LTP induced by a single tetanus. Exposure of granule cells in culture to forskolin results in secretion of tPA, elongation of mossy fiber axons, and formation of new, active presynaptic varicosities contiguous to dendritic clusters of the glutamate receptor R1. These structural changes are blocked by tPA inhibitors and induced by application of tPA. Thus, tPA may be critically involved in the production of L-LTP and specifically in synaptic growth.

Original languageEnglish
Pages (from-to)813-825
Number of pages13
JournalNeuron
Volume21
Issue number4
DOIs
StatePublished - 1 Jan 1998
Externally publishedYes

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