TY - JOUR
T1 - Tissue plasminogen activator is required for corticostriatal long-term potentiation
AU - Centonze, Diego
AU - Napolitano, Maddalena
AU - Saulle, Emilia
AU - Gubellini, Paolo
AU - Picconi, Barbara
AU - Martorana, Alessandro
AU - Pisani, Antonio
AU - Gulino, Alberto
AU - Bernardi, Giorgio
AU - Calabresi, Paolo
PY - 2002
Y1 - 2002
N2 - Several experimental data indicate that tissue plasminogen activator (tPA) is involved in memory formation and synaptic plasticity in different brain areas. In the attempt to highlight the role of this serine protease in striatal neuron activity, mice lacking tPA have been used for electrophysiological, immunohistochemical and Western blot experiments. Disruption of tPA gene prevented corticostriatal long-term potentiation, an NMDA-dependent form of synaptic plasticity requiring the stimulation of both dopamine and acetylcholine receptors. Spontaneous and evoked glutamatergic transmission was intact in the striatum of tPA-deficient mice, as was the nigrostriatal dopamine innervation and the expression of dopamine D1 receptors. Conversely, the sensitivity of striatal cholinergic interneurons to dopamine D1 receptor stimulation was lost in these mutants, suggesting that tPA facilitates long-term potentiation (LTP) induction in the striatum by favouring the D1 receptor-mediated excitation of acetylcholine-producing interneurons. The demonstration that tPA ablation interferes with the induction of corticostriatal LTP and with the dopamine receptor-mediated control of cholinergic interneurons might help to explain the altered striatum-dependent learning deficits observed in tPA-deficient mice and provides new insights into the molecular mechanisms underlying synaptic plasticity in the striatum.
AB - Several experimental data indicate that tissue plasminogen activator (tPA) is involved in memory formation and synaptic plasticity in different brain areas. In the attempt to highlight the role of this serine protease in striatal neuron activity, mice lacking tPA have been used for electrophysiological, immunohistochemical and Western blot experiments. Disruption of tPA gene prevented corticostriatal long-term potentiation, an NMDA-dependent form of synaptic plasticity requiring the stimulation of both dopamine and acetylcholine receptors. Spontaneous and evoked glutamatergic transmission was intact in the striatum of tPA-deficient mice, as was the nigrostriatal dopamine innervation and the expression of dopamine D1 receptors. Conversely, the sensitivity of striatal cholinergic interneurons to dopamine D1 receptor stimulation was lost in these mutants, suggesting that tPA facilitates long-term potentiation (LTP) induction in the striatum by favouring the D1 receptor-mediated excitation of acetylcholine-producing interneurons. The demonstration that tPA ablation interferes with the induction of corticostriatal LTP and with the dopamine receptor-mediated control of cholinergic interneurons might help to explain the altered striatum-dependent learning deficits observed in tPA-deficient mice and provides new insights into the molecular mechanisms underlying synaptic plasticity in the striatum.
KW - Dopamine receptors
KW - Motor learning
KW - Tyrosine hydroxylase
KW - Western blot
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U2 - 10.1046/j.1460-9568.2002.02106.x
DO - 10.1046/j.1460-9568.2002.02106.x
M3 - Article
C2 - 12270047
AN - SCOPUS:18744404484
VL - 16
SP - 713
EP - 721
JO - European Journal of Neuroscience
JF - European Journal of Neuroscience
SN - 0953-816X
IS - 4
ER -