Chronic repetitive transcranial magnetic stimulation induces subsensitivity of presynaptic serotonergic autoreceptor activity in rat brain
by
Gur E, Lerer B, Dremencov E, Newman ME.
Biological Psychiatry Laboratory,
Hadassah University Hospital,
Jerusalem, Israel.
Neuroreport 2000 Sep 11;11(13):2925-9

ABSTRACT

Repetitive transcranial magnetic stimulation (rTMS) is a novel procedure which has proven effective in the treatment of major depression. We administered rTMS chronically to rats in order to determine whether this procedure affected serotonergic neurotransmission in the prefrontal cortex. Basal 5-HT levels, and the effects of challenges with the 5-HT1A receptor agonist 8-OH-DPAT and the 5-HT1B antagonist GR 127935 on 5-HT levels were determined using in vivo microdialysis. Rats which had undergone chronic rTMS showed reduced responses to both challenges, indicating subsensitivity of both the presynaptic 5-HT1A autoreceptors situated somatodendritically in the raphe nuclei and the 5-HT1B autoreceptors situated on nerve terminals. Since such subsensitivity has been demonstrated after other antidepressant treatments, our results indicate that these treatments and rTMS may have a common mechanism of action.

ECT
rTMS
Frequency
rTMS and rats
Antidepressant
ECT versus rTMS
rTMS for depression
rTMS, 5-HT2 and beta-receptors
The Transcranial Magnetic Stimulator
rTMS and brain derived neurotrophic factor
rTMS for unipolar depression and bipolar disorder

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