No study has yet investigated whether cortical plasticity in primary motor area (M1) is abnormal in patients with progressive supranuclear palsy (PSP). We studied M1 plasticity in 15 PSP patients and 15 age-matched healthy subjects. We used intermittent theta-burst stimulation (iTBS) to investigate long-term potentiation (LTP) and continuous TBS (cTBS) to investigate long-term depression (LTD)-like cortical plasticity in M1. Ten patients underwent iTBS again 1 year later. We also investigated short-interval intracortical inhibition (SICI) and intracortical facilitation (ICF) in M1 with paired-pulse transcranial magnetic stimulation, tested H reflex from upper limb flexor muscles before and after iTBS, and measured motor evoked potential (MEP) input-output (I/O) curves before and after iTBS. iTBS elicited a significantly larger MEP facilitation after iTBS in patients than in healthy subjects. Whereas in healthy subjects, cTBS inhibited MEP, in patients it significantly facilitated MEPs. In patients, SICI was reduced, whereas ICF was normal. H reflex size remained unchanged after iTBS. Patients had steeper MEP I/O slopes than healthy subjects at baseline and became even more steeper after iTBS only in patients. The iTBS-induced abnormal MEP facilitation in PSP persisted at 1-year follow-up. In conclusion, patients with PSP have abnormal M1 LTP/LTD-like plasticity. The enhanced LTP-like cortical synaptic plasticity parallels disease progression.

Abnormal Cortical Synaptic Plasticity in Primary Motor Area in Progressive Supranuclear Palsy / Conte, Antonella; Belvisi, D.; Bologna, Matteo; Ottaviani, D.; Fabbrini, Giovanni; Colosimo, Carlo; Williams, D. r.; Berardelli, Alfredo. - In: CEREBRAL CORTEX. - ISSN 1047-3211. - 22:3(2012), pp. 693-700. [10.1093/cercor/bhr149]

Abnormal Cortical Synaptic Plasticity in Primary Motor Area in Progressive Supranuclear Palsy

CONTE, ANTONELLA;D. Belvisi;BOLOGNA, Matteo;FABBRINI, Giovanni;COLOSIMO, Carlo;BERARDELLI, Alfredo
2012

Abstract

No study has yet investigated whether cortical plasticity in primary motor area (M1) is abnormal in patients with progressive supranuclear palsy (PSP). We studied M1 plasticity in 15 PSP patients and 15 age-matched healthy subjects. We used intermittent theta-burst stimulation (iTBS) to investigate long-term potentiation (LTP) and continuous TBS (cTBS) to investigate long-term depression (LTD)-like cortical plasticity in M1. Ten patients underwent iTBS again 1 year later. We also investigated short-interval intracortical inhibition (SICI) and intracortical facilitation (ICF) in M1 with paired-pulse transcranial magnetic stimulation, tested H reflex from upper limb flexor muscles before and after iTBS, and measured motor evoked potential (MEP) input-output (I/O) curves before and after iTBS. iTBS elicited a significantly larger MEP facilitation after iTBS in patients than in healthy subjects. Whereas in healthy subjects, cTBS inhibited MEP, in patients it significantly facilitated MEPs. In patients, SICI was reduced, whereas ICF was normal. H reflex size remained unchanged after iTBS. Patients had steeper MEP I/O slopes than healthy subjects at baseline and became even more steeper after iTBS only in patients. The iTBS-induced abnormal MEP facilitation in PSP persisted at 1-year follow-up. In conclusion, patients with PSP have abnormal M1 LTP/LTD-like plasticity. The enhanced LTP-like cortical synaptic plasticity parallels disease progression.
2012
cortical plasticity; motor cortex excitability; progressive supranuclear palsy; theta-burst stimulation
01 Pubblicazione su rivista::01a Articolo in rivista
Abnormal Cortical Synaptic Plasticity in Primary Motor Area in Progressive Supranuclear Palsy / Conte, Antonella; Belvisi, D.; Bologna, Matteo; Ottaviani, D.; Fabbrini, Giovanni; Colosimo, Carlo; Williams, D. r.; Berardelli, Alfredo. - In: CEREBRAL CORTEX. - ISSN 1047-3211. - 22:3(2012), pp. 693-700. [10.1093/cercor/bhr149]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/398830
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