Unaltered Brain GABA Concentrations and Resting fMRI Activity in Functional Dyspepsia With and Without Comorbid Depression
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AbstractBackground: GABA-deficit characterizes depression (MDD), which is highly comorbid with Functional Dyspepsia (FD). We examined brain GABA concentrations and resting activities in post-prandial distress subtype FD (FD-PDS) patients with and without MDD.

Methods: 24 female age/education-matched FD-PDS with comorbid MDD (FD-PDS-MDD), non-depressed FD-PDS, and healthy controls each were compared on GABA concentrations, resting fMRI (fALFF) in bilateral pregenual anterior cingulate (pgACC), left dorsolateral prefrontal cortex (DLPFC), insula, and somatosensory cortex (SSC).

Results: FD-PDS-MDD patients had mild though elevated depressive symptoms. FD-PDS patients had generally mild dyspeptic symptoms. No significant between-group differences in GABA or fALFF were found. No significant correlations were found between GABA and depressive/dyspeptic symptoms after Bonferroni correction. In patients, GABA correlated positively with left insula fALFF (r = 0.38, Bonferroni-corrected p = .03).

Conclusion: We did not find altered GABA concentrations or brain resting activity in FD-PDS or its MDD comorbidity. The neurochemical link between MDD and FD remains elusive.
Acceptance Date24/08/2020
All Author(s) ListMak ADP, Ho YM, Leung ONW, Chou IWY, Lui R, Wong S, Yeung DKW, Chu WCW, Edden R, Chan S, Lam L, Wu J
Journal nameFrontiers in Psychiatry
Volume Number11
PublisherFrontiers Media
Article number549749
LanguagesEnglish-United States
Keywordsmajor depressive disorder, functional dyspepsia, GABA, magnetic resonance spectroscopy,
resting fMRI

Last updated on 2021-25-02 at 23:49