Dopamine-dependent changes of cortical excitability induced by transcranial static magnetic field stimulation in Parkinson's disease.

Autor:	Dileone M; CINAC, Hospital Universitario HM Puerta del Sur, Universidad CEU San Pablo, Móstoles, Madrid, Spain.; Hospital Nacional de Parapléjicos, SESCAM, Toledo, Spain., Carrasco-López MC; Hospital Nacional de Parapléjicos, SESCAM, Toledo, Spain., Segundo-Rodriguez JC; Servicio de Neurología, Hospital Virgen de la Salud, SESCAM, Toledo, Spain., Mordillo-Mateos L; Hospital Nacional de Parapléjicos, SESCAM, Toledo, Spain., López-Ariztegui N; Servicio de Neurología, Hospital Virgen de la Salud, SESCAM, Toledo, Spain., Alonso-Frech F; CINAC, Hospital Universitario HM Puerta del Sur, Universidad CEU San Pablo, Móstoles, Madrid, Spain.; Hospital Clínico San Carlos, Madrid, Spain., Catalan-Alonso MJ; Hospital Clínico San Carlos, Madrid, Spain., Obeso JA; CINAC, Hospital Universitario HM Puerta del Sur, Universidad CEU San Pablo, Móstoles, Madrid, Spain., Oliviero A; Hospital Nacional de Parapléjicos, SESCAM, Toledo, Spain. antonio.oliviero@hotmail.com., Foffani G; CINAC, Hospital Universitario HM Puerta del Sur, Universidad CEU San Pablo, Móstoles, Madrid, Spain. gfoffani.hmcinac@hmhospitales.com.; Hospital Nacional de Parapléjicos, SESCAM, Toledo, Spain. gfoffani.hmcinac@hmhospitales.com.
Jazyk:	angličtina
Zdroj:	Scientific reports [Sci Rep] 2017 Jun 28; Vol. 7 (1), pp. 4329. Date of Electronic Publication: 2017 Jun 28.
DOI:	10.1038/s41598-017-04254-y
Abstrakt:	Transcranial static magnetic field stimulation (tSMS) is a recent low-cost non-invasive brain stimulation technique that decreases cortical excitability in healthy subjects. The objective of the present study was to test the ability of tSMS to modulate cortical excitability in patients with Parkinson's disease. We performed a randomized double-blind sham-controlled cross-over study to assess cortical excitability before and immediately after tSMS (or sham) applied for 10 min to the more affected motor cortex of patients with Parkinson's disease. Cortical excitability was quantified by the amplitude of motor evoked potentials (MEPs) elicited by single-pulse transcranial magnetic stimulation (TMS). tSMS significantly decreased MEP amplitudes in patients OFF medication (after overnight withdrawal of dopaminergic drugs), but not ON medication (after an acute dose of levodopa). The between-patients variability of tSMS-induced changes was significantly greater ON medication. The variability ON medication could be partly explained by disease progression, i.e. the more advanced the patient, the more likely it was to observe a switch from inhibitory tSMS plasticity OFF medication to paradoxical facilitatory plasticity ON medication. These results suggest that tSMS induces dopamine-dependent changes of cortical excitability in patients with Parkinson's disease.
Databáze:	MEDLINE
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