Abstract
Rational
Activation of nicotinic acetylcholine receptors has a major neuromodulatory impact on central nervous system function. Beyond acute activation, chronic nicotine intake has long-lasting effects on cortical excitability in animal experiments, caused by receptor up- or down-regulation. Knowledge about the impact of nicotine on cortical excitability in humans, however, is limited.
Objectives
We therefore aimed to explore the effect of nicotine intake on cortical excitability in healthy human smokers and non-smokers.
Methods
The primary motor cortex served as model, and cortical excitability was monitored via transcranial magnetic stimulation (TMS). Corticospinal excitability and intracortical excitability were recorded before and after application of nicotine patch in both groups. Corticospinal excitability was explored by motor threshold and input/output curve (I/O curve), and intracortical excitability was explored by means of paired-pulse TMS techniques (intracortical facilitation (ICF), short-latency intracortical inhibition (SICI), I-wave facilitation and short-latency afferent inhibition (SAI)).
Results
The results show that smokers during nicotine withdrawal display increased corticospinal excitability with regard to the I/O curve (TMS intensity 150 % of resting motor threshold) compared to non-smokers and furthermore enhanced SAI and diminished ICF at the intracortical circuit level. After administration of nicotine, intracortical facilitation in smokers increased, while in non-smokers, inhibition (SICI, SAI) was enhanced.
Conclusion
Our results show that chronic nicotine consumption in smokers alters cortical excitability independent from acute nicotine consumption and that acute nicotine has different effects on motor cortical excitability in both groups.
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Abbreviations
- ADM:
-
Abductor digiti minimi muscle
- AMT:
-
Active motor threshold
- ICF:
-
Intracortical facilitation
- I/O curves:
-
Input/output curves
- ISI:
-
Interstimulus interval
- MEP:
-
Motor evoked potential
- nAChR:
-
Nicotinic acetylcholine receptors
- RMT:
-
Resting motor threshold
- S1mV:
-
TMS intensity needed to elicit an MEP of 1 mV
- SAI:
-
Short-interval afferent inhibition
- SICI:
-
Short-latency intracortical inhibition
- TMS:
-
Transcranial magnetic stimulation
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Acknowledgments
This study was supported by the Deutsche Forschungsgemeinschaft (DFG grant NI683/4-1 ‘Towards risk prediction of nicotine dependency by exploring individual limits of cortical neuroplasticity in humans’ and ‘Impact of the nicotinergic alpha7 receptor on cortical plasticity in smokers and non-smokers’) within the DFG priority program ‘Nicotine: Molecular and Physiological Effects in Central Nervous System’.
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Table S 1
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Figure Online Resource 2
Displays the I/O curve for 10 healthy non-smoking subjects at baseline, 2 hours after administration of 20 mg domperidone and again 4 hours after administration of a second dosage domperidone (6 hours post, relating to baseline). Shown are the graphs with the standardized MEP-amplitudes (y-axis) plotted against the respective stimulation intensity (x-axis). Hereby RMT signifies resting motor threshhold. There is no significant difference between the MEP-amplitudes at baseline and the MEP-amplitudes 2 and 6 hours after baseline measurements and domperidone ingestion (Students t-test, paired, two-tailed, p < 0.05). Error bars indicate standard error of mean. (PPT 137 kb)
Figure Online Resource 3
Displays MEP-amplitudes at different timepoints. TMS intensity was determined to elicit an MEP of about 1 mV at baseline and kept constant throughout the experiment. Shown are the graphs with motor-evoked potential (MEP) on the y-axis at different timepoints after administration of domperidone (x-axis). There is no significant difference between the MEP-amplitude before and after administration of domperidone (2 hours and 6 hours) (Students t-test, paired, two-tailed, p < 0.05). Error bars indicate standard error of mean. (PPT 108 kb)
Figure Online Resource 4
Displays short latency afferent inhibition (SAI) at an interstimulus interval of 20 ms for 6 healthy non-smokers at baseline, 2 hours after administration of 20 mg domperidone and again 4 hours after administration of a second dosage domperidone (6 hours post, relating to baseline). Shown are the graphs with the standardized MEP-amplitude (y-axis) plotted against the timepoints (x-axis; baseline, 2 hours post, 6 hours post). There is no significant difference between the MEP-amplitude at baseline and the MEP-amplitude 2 and 6 hours after baseline measurements and domperidone ingestion (Students t-test, paired, two-tailed, p < 0.05). Error bars indicate standard error of mean. (PPT 114 kb)
Figure Online Resource 5
Displays short interval intracortical inhibition (SICI) and intracortical facilitation (ICF) of 10 healthy non-smoking subjects at baseline, 2 hours after administration of 20 mg domperidone and again 4 hours after administration of a second dosage domperidone (6 hours post, relating to baseline). Shown are the graphs with the standardized MEP-amplitudes (y-axis) plotted against the respective interstimulus intervals ( x-axis; 2 ms, 3 ms, 7 ms, 10 ms, 15 ms). There is no significant difference between the MEP-amplitudes at baseline and the MEP-amplitudes 2 and 6 hours after baseline measurements and domperidone ingestion (Students t-test, paired, two-tailed, p < 0.05). Error bars indicate standard error of mean. (PPT 137 kb)
Figure Online Resource 6
Displays the i-wave facilitation of 6 healthy non-smoking subjects at different interstimulus intervals (ISIs) at baseline, 2 hours after administration of 20 mg domperidone and again 4 hours after administration of a second dosage domperidone (6 hours post, relating to baseline). Shown are the graphs with the standardized MEP-amplitudes (y-axis) plotted against the respective interstimulus intervals (x-axis). There is no significant difference between the MEP-amplitudes at baseline and the MEP-amplitudes 2 and 6 hours after baseline measurements and domperidone ingestion (Students t-test, paired, two-tailed, p < 0.05). Error bars indicate standard error of mean. (PPT 150 kb)
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Grundey, J., Freznosa, S., Klinker, F. et al. Cortical excitability in smoking and not smoking individuals with and without nicotine. Psychopharmacology 229, 653–664 (2013). https://doi.org/10.1007/s00213-013-3125-6
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DOI: https://doi.org/10.1007/s00213-013-3125-6