Abstract
The amygdala-medial prefrontal cortex (mPFC) circuit plays a key role in social behavior. The amygdala and mPFC are bidirectionally connected, functionally and anatomically, via the uncinate fasciculus. Recent evidence suggests that GABA-ergic neurotransmission within the mPFC could be central to the regulation of amygdala activity related to emotions and anxiety processing. However, the functional and neurochemical interactions within amygdala-mPFC circuits are unclear. In the current study, multimodal magnetic resonance imaging techniques were combined to investigate effective connectivity within the amygdala-mPFC network and its relationship with mPFC neurotransmission in 22 healthy subjects aged between 41 and 88 years. Effective connectivity in the amygdala-mPFC circuit was assessed on resting-state functional magnetic resonance imaging data using spectral dynamic causal modelling. State and trait anxiety were also assessed. The mPFC was shown to be the target of incoming outputs from the amygdalae and the source of exciting inputs to the limbic system. The amygdalae were reciprocally connected by excitatory projections. About half of the variance relating to the strength of top–down endogenous connection between right amygdala and mPFC was explained by mPFC GABA levels. State anxiety was correlated with the strength of the endogenous connections between right amygdala and mPFC. We suggest that mPFC GABA content predicts variability in the effective connectivity within the mPFC-amygdala circuit, providing new insights on emotional physiology and the underlying functional and neurochemical interactions.
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Change history
08 June 2017
An erratum to this article has been published.
Abbreviations
- GABA:
-
γ-Aminobutyric acid
- GM:
-
Grey matter
- STAI:
-
State-Trait Anxiety Inventory scale (Y1 = subscale-1, Y2 = subscale-2).
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Acknowledgements
The work has been supported by the Italian Ministry of Health (Grant No. GR-2010-2313418) and the Wellcome Trust (Grant No. 101253/A/13/Z). This study applies tools developed under NIH R01 EB016089 and P41 EB015909; RAEE also receives salary support from these grants.
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In the original publication of this article, the family name co-author has been published incorrectly; this error has now been corrected.
An erratum to this article is available at https://doi.org/10.1007/s00429-017-1446-7.
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429_2017_1399_MOESM1_ESM.tiff
Supplementary figure 1. Representative GANNET-edited MR spectra showing the GABA peak (in red). Abbreviations: GABA=γ-Aminobutyric acid (3.02 ppm); mPFC=medial prefrontal cortex (TIFF 12 KB)
429_2017_1399_MOESM2_ESM.tiff
Supplementary figure 2. Scatterplots displaying the relationship a GABA+/tCr content and effective connectivity. The strength of the effective connectivity is reported in Hz. FDR p values are reported for each correlation. Abbreviations: The wordings “mPFC-mPFC” and “AMG-AMG” refer to the intrinsic connectivity within mPFC and amygdala, respectively. RAMG=right amygdala; LAMG=left amygdala; mPFC=medial prefrontal cortex (TIFF 185 KB)
429_2017_1399_MOESM3_ESM.tiff
Supplementary figure 3. Scatterplots displaying the relationship among effective connectivity and STAI-Y1. The strength of the effective connectivity is reported in Hz. FDR p values are reported for each correlation. Abbreviations: The wordings “mPFC-mPFC” and “AMG-AMG” refer to the intrinsic connectivity within mPFC and amygdala, respectively. RAMG=right amygdala; LAMG=left amygdala; mPFC=medial prefrontal cortex (TIFF 61 KB)
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Delli Pizzi, S., Chiacchiaretta, P., Mantini, D. et al. GABA content within medial prefrontal cortex predicts the variability of fronto-limbic effective connectivity. Brain Struct Funct 222, 3217–3229 (2017). https://doi.org/10.1007/s00429-017-1399-x
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DOI: https://doi.org/10.1007/s00429-017-1399-x