ADORA2A Gene variation, caffeine, and emotional processing: a multi-level interaction on startle reflex.
There is converging evidence for genetic, biochemical, and neuropsychological factors to increase the risk for anxiety and anxiety disorders. The pathogenesis of anxiety disorders is assumed to be influenced by a complex interaction of these individual risk factors on several levels, affecting intermediate phenotypes of anxiety such as the startle reflex. Thus, in the present double-blind, placebo-controlled study we attempted to paradigmatically investigate a multi-level pathogenetic model of anxiety by testing the effect of 300 mg caffeine citrate as an antagonist at the adenosine A2A receptor vs placebo on the emotion-potentiated (unpleasant, neutral, and pleasant International Affective Picture System pictures) startle reflex in 110 healthy individuals (male=56, female=54) stratified for the adenosine A2A receptor (ADORA2A) 1976T>C polymorphism (rs5751876). In addition to the expected main effect of picture category (highest startle amplitude for unpleasant, lowest for pleasant pictures) groups across all ADORA2A 1976T>C genotype and intervention (caffeine vs placebo) groups, an interaction effect of genotype, intervention, and picture category was discerned: In ADORA2A 1976TT risk genotype carriers, highest startle magnitudes were observed after caffeine administration in response to unpleasant pictures, with this effect arising particularly from the female subgroup. Our data point to a complex, multi-level, and potentially gender-specific pathogenetic model of anxiety, with genetic and biochemical factors interactively increasing the risk of maladaptive emotional processing and thereby possibly also anxiety disorders. The present findings may eventually aid in improving primary and secondary prevention by sharpening the risk profiles of anxiety-prone individuals.
Department of Psychiatry, University of Muenster, Muenster, Germany. katharina.domschke@ukmuenster.de
Katharina
K
Domschke
Agnieszka
A
Gajewska
Bernward
B
Winter
Martin J
MJ
Herrmann
Bodo
B
Warrings
Andreas
A
Mühlberger
Katherina
K
Wosnitza
Evelyn
E
Glotzbach
Annette
A
Conzelmann
Andrea
A
Dlugos
Manfred
M
Fobker
Christian
C
Jacob
Volker
V
Arolt
Andreas
A
Reif
Paul
P
Pauli
Peter
P
Zwanzger
Jürgen
J
Deckert
D000328:Adult; D001007:Anxiety / Q000235:genetics*; D002110:Caffeine / Q000494:pharmacology*; D004311:Double-Blind Method; D004644:Emotions / Q000187:drug effects / Q000502:physiology*; D005260:Female; D020022:Genetic Predisposition to Disease; D005838:Genotype; D006801:Humans; D008297:Male; D020641:Polymorphism, Single Nucleotide; D043705:Receptor, Adenosine A2A / Q000235:genetics* / Q000378:metabolism; D013216:Reflex, Startle / Q000187:drug effects / Q000235:genetics*; D012737:Sex Factors
D043705:Receptor, Adenosine A2A; D002110:Caffeine