title: Acute L-5-hydroxytryptophan administration inhibits carbon dioxide-induced panic in panic disorder patients.
abstract: Previous research showed that lowering the availability of serotonin to the brain by tryptophan depletion increases the vulnerability of panic disorder patients for an experimental 35% CO(2) panic challenge. The results also suggested that increased availability of serotonin inhibits the response to such a challenge. In the present study, this latter possibility is examined. The reaction of 24 panic disorder patients and 24 healthy volunteers to a 35% CO(2) panic challenge was assessed following administration of 200-mg L-5-hydroxytryptophan (the immediate precursor of serotonin) or placebo. L-5-Hydroxytryptophan significantly reduced the reaction to the panic challenge in panic disorder patients, regarding subjective anxiety, panic symptom score and number of panic attacks, as opposed to placebo. No such effect was observed in the healthy volunteers. L-5-Hydroxytryptophan acts to inhibit panic, which supports a modulatory role of serotonin in panic disorder.
authors.affiliation: Department of Psychiatry and Neuropsychology, Institute of Brain and Behaviour, Maastricht University, P.O. Box 88, The Netherlands. koen.schruers@pn.unimaas.nl
authors.forename: Koen
authors.initials: K
authors.lastname: Schruers
authors.forename: Rob
authors.initials: R
authors.lastname: van Diest
authors.forename: Thea
authors.initials: T
authors.lastname: Overbeek
authors.forename: Eric
authors.initials: E
authors.lastname: Griez
mesh_terms: D006916:5-Hydroxytryptophan / Q000008:administration & dosage* / Q000494:pharmacology*; D000293:Adolescent; D000328:Adult; D000368:Aged; D001921:Brain / Q000187:drug effects*; D002245:Carbon Dioxide / Q000009:adverse effects* / Q000378:metabolism*; D004311:Double-Blind Method; D004334:Drug Administration Schedule; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D016584:Panic Disorder / Q000139:chemically induced* / Q000517:prevention & control*
chemical_list: D002245:Carbon Dioxide; D006916:5-Hydroxytryptophan