Abstract:
BACKGROUND:Transcranial magnetic stimulation (TMS) is a noninvasive procedure that may be used to study individual differences in motor cortex excitability. Such differences are assumed to reflect serotonergic and other inputs to the motor cortex. METHODS:Here we investigate the impact of a functional polymorphism in the promoter region of the 5-hydroxytryptamine transporter gene (5-HTTLPR) on measures of motor cortex excitability. RESULTS:Sixty healthy subjects carrying one or two copies of the short 5-HTTLPR allele (s/s and s/l) showed a significant reduction in short intracortical inhibition (SICI, p = .012) and an increased cortical silent period (p = .042) compared with 60 age- and sex-matched individuals homozygous for the long allele (l/l). In contrast, motor threshold and intracortical facilitation did not differ significantly between groups. CONCLUSIONS:These results provide further evidence of a role for serotonergic transmission in the modulation of cortical excitability. Differential effects on the measures under study suggest a pattern of prioritization in bioamine regulation of cortical inhibition.
journal_name
Biol Psychiatryjournal_title
Biological psychiatryauthors
Langguth B,Sand P,Marek R,Landgrebe M,Frank E,Hajak G,Eichhammer Pdoi
10.1016/j.biopsych.2009.02.005subject
Has Abstractpub_date
2009-08-01 00:00:00pages
283-6issue
3eissn
0006-3223issn
1873-2402pii
S0006-3223(09)00189-9journal_volume
66pub_type
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