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MAOA and mechanisms of panic disorder revisited: from bench to molecular psychotherapy

Abstract

Panic disorder with agoraphobia (PD/AG) is a prevalent mental disorder featuring a substantial complex genetic component. At present, only a few established risk genes exist. Among these, the gene encoding monoamine oxidase A (MAOA) is noteworthy given that genetic variation has been demonstrated to influence gene expression and monoamine levels. Long alleles of the MAOA-uVNTR promoter polymorphism are associated with PD/AG and correspond with increased enzyme activity. Here, we have thus investigated the impact of MAOA-uVNTR on therapy response, behavioral avoidance and brain activity in fear conditioning in a large controlled and randomized multicenter study on cognitive behavioral therapy (CBT) in PD/AG. The study consisted of 369 PD/AG patients, and genetic information was available for 283 patients. Carriers of the risk allele had significantly worse outcome as measured by the Hamilton Anxiety scale (46% responders vs 67%, P=0.017). This was accompanied by elevated heart rate and increased fear during an anxiety-provoking situation, that is, the behavioral avoidance task. All but one panic attack that happened during this task occurred in risk allele carriers and, furthermore, risk allele carriers did not habituate to the situation during repetitive exposure. Finally, functional neuroimaging during a classical fear conditioning paradigm evidenced that the protective allele is associated with increased activation of the anterior cingulate cortex upon presentation of the CS+ during acquisition of fear. Further differentiation between high- and low-risk subjects after treatment was observed in the inferior parietal lobes, suggesting differential brain activation patterns upon CBT. Taken together, we established that a genetic risk factor for PD/AG is associated with worse response to CBT and identify potential underlying neural mechanisms. These findings might govern how psychotherapy can include genetic information to tailor individualized treatment approaches.

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Acknowledgements

We are grateful to all individuals who participated in this study. This work is part of the German multicenter trial ‘Mechanisms of Action in CBT (MAC)’. The MAC study is funded by the German Federal Ministry of Education and Research (BMBF; project no. 01GV0615) as part of the BMBF Psychotherapy Research Funding Initiative. The principal investigators (PIs) of the centers with respective areas of responsibility in the MAC study are: V Arolt (Münster: Overall MAC Program Coordination), HU Wittchen (Dresden: PI for the Randomized Clinical Trial and Manual Development), A Hamm (Greifswald: PI for Psychophysiology), AL Gerlach (Münster: PI for Psychophysiology and Panic subtypes), A Ströhle (Berlin: PI for Experimental Pharmacology), T Kircher (Marburg: PI for functional neuroimaging) and J Deckert (Würzburg: PI for Genetics). Additional site directors in the RTC component of the program are GW Alpers (Würzburg), T Fydrich and L Fehm (Berlin-Adlershof) and T Lang (Bremen). For staff members by site, see Supplementary Material. The study was further supported by the DFG (Grant RE1632/5-1 and KFO 125 to AR; SFB TRR 58 Z02 to JD, PP and AR; C02 to JD and KD; DE357/4-1 to JD, AR, JR and AH; RTG 1256 to AR, JD and PP). T Töpner, N Steigerwald, C Gagel and J Auer are credited for excellent technical assistance.

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Correspondence to A Reif.

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V Arolt is a member of the advisory boards and/or gave presentations for the following companies: Astra-Zeneca, Janssen-Organon, Lilly, Lundbeck, Servier, Pfizer and Wyeth. He also received research grants from Astra-Zeneca, Lundbeck and Servier. He chaired the committee for the ‘Wyeth Research Award Depression and Anxiety’. J Deckert received in the past 3 years honoraria by Janssen, Bristol Myers-Squibb, Wyeth, Lundbeck, Astra-Zeneca and Pfizer and Grant Support by Medice, Lundbeck and AstraZeneca. T Kircher received fees for educational programs from Janssen-Cilag, Eli Lilly, Servier, Lundbeck, Bristol Myers Squibb, Pfizer and Astra-Zeneca; travel support/sponsorship for congresses from Servier; speaker’s honoraria from Janssen-Cilag; and research grants from Pfizer and Lundbeck. C Konrad received fees for educational programs from Esparma GmbH/Aristo Pharma GmbH, Lilly Deutschland GmbH, Servier Deutschland GmbH and MagVenture GmbH. A Reif has received research support from PsyNova, and A Reif and K Domschke have received research grants from Astra Zeneca. K Domschke has received honoraria for scientific talks from Pfizer, Lilly and Bristol-Myers Squibb and has been a consultant for Johnson&Johnson. A Ströhle received research funding from Lundbeck, and speaker honoraria from AstraZeneca, Boehringer Ingelheim, Eli Lilly & Co, Lundbeck, Pfizer, Wyeth and UCB. Educational grants were given by the Stifterverband für die Deutsche Wissenschaft, the Berlin Brandenburgische Akademie der Wissenschaften, the Boehringer Ingelheim Fonds and the Eli Lilly International Foundation. H-U Wittchen has served as a general consultant (non-product related) for Pfizer, Organon, Servier and EssexPharma and has received grant funding for his institution from Sanofi Aventis, Pfizer, Lundbeck, Novartis, Essex Pharma, Servier and Wyeth. The other authors declare no conflict of interest.

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Reif, A., Richter, J., Straube, B. et al. MAOA and mechanisms of panic disorder revisited: from bench to molecular psychotherapy. Mol Psychiatry 19, 122–128 (2014). https://doi.org/10.1038/mp.2012.172

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