Abstract
Electroconvulsive therapy (ECT) has been repeatedly linked to hippocampal plasticity. However, it remains unclear what role hippocampal plasticity plays in the antidepressant response to ECT. This magnetic resonance imaging (MRI) study tracks changes in separate hippocampal subregions and hippocampal networks in patients with depression (nā=ā44, 23 female) to determine their relationship, if any, with improvement after ECT. Voxelwise analyses were restricted to the hippocampus, amygdala, and parahippocampal cortex, and applied separately for responders and nonresponders to ECT. In analyses of arterial spin-labeled (ASL) MRI, nonresponders exhibited increased cerebral blood flow (CBF) in bilateral anterior hippocampus, while responders showed CBF increases in right middle and left posterior hippocampus. In analyses of gray matter volume (GMV) using T1-weighted MRI, GMV increased throughout bilateral hippocampus and surrounding tissue in nonresponders, while responders showed increased GMV in right anterior hippocampus only. Using CBF loci as seed regions, BOLD-fMRI data from healthy controls (nā=ā36, 19 female) identified spatially separable neurofunctional networks comprised of different brain regions. In graph theory analyses of these networks, functional connectivity within a hippocampus-thalamus-striatum network decreased only in responders after two treatments and after index. In sum, our results suggest that the location of ECT-related plasticity within the hippocampus may differ according to antidepressant outcome, and that larger amounts of hippocampal plasticity may not be conducive to positive antidepressant response. More focused targeting of hippocampal subregions and/or circuits may be a way to improve ECT outcome.
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Acknowledgements
This work was supported by the NIH, including R01 MH092301 and U01 MH110008 to KLN and RE and K24 MH102743 to KLN, the Muriel Harris Chair in Geriatric Psychiatry to RE, as well as the Brian and Behavior Research Foundation, a NARSAD Young Investigator award to AML.
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Leaver, A.M., Vasavada, M., Kubicki, A. et al. Hippocampal subregions and networks linked with antidepressant response to electroconvulsive therapy. Mol Psychiatry 26, 4288ā4299 (2021). https://doi.org/10.1038/s41380-020-0666-z
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DOI: https://doi.org/10.1038/s41380-020-0666-z
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