Primary functional brain connections associated with melancholic major depressive disorder and modulation by antidepressants

Naho Ichikawa, Giuseppe Lisi, Noriaki Yahata, Go Okada, Masahiro Takamura, Ryu ichiro Hashimoto, Takashi Yamada, Makiko Yamada, Tetsuya Suhara, Sho Moriguchi, Masaru Mimura, Yujiro Yoshihara, Hidehiko Takahashi, Kiyoto Kasai, Nobumasa Kato, Shigeto Yamawaki, Ben Seymour, Mitsuo Kawato, Jun Morimoto, Yasumasa Okamoto

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Abstract

The limited efficacy of available antidepressant therapies may be due to how they affect the underlying brain network. The purpose of this study was to develop a melancholic MDD biomarker to identify critically important functional connections (FCs), and explore their association to treatments. Resting state fMRI data of 130 individuals (65 melancholic major depressive disorder (MDD) patients, 65 healthy controls) were included to build a melancholic MDD classifier, and 10 FCs were selected by our sparse machine learning algorithm. This biomarker generalized to a drug-free independent cohort of melancholic MDD, and did not generalize to other MDD subtypes or other psychiatric disorders. Moreover, we found that antidepressants had a heterogeneous effect on the identified FCs of 25 melancholic MDDs. In particular, it did impact the FC between left dorsolateral prefrontal cortex (DLPFC)/inferior frontal gyrus (IFG) and posterior cingulate cortex (PCC)/precuneus, ranked as the second ‘most important’ FC based on the biomarker weights, whilst other eight FCs were normalized. Given that left DLPFC has been proposed as an explicit target of depression treatments, this suggest that the limited efficacy of antidepressants might be compensated by combining therapies with targeted treatment as an optimized approach in the future.

Original languageEnglish
Article number3542
JournalScientific reports
Volume10
Issue number1
DOIs
Publication statusPublished - 2020 Dec 1

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Cite this

Ichikawa, N., Lisi, G., Yahata, N., Okada, G., Takamura, M., Hashimoto, R. I., Yamada, T., Yamada, M., Suhara, T., Moriguchi, S., Mimura, M., Yoshihara, Y., Takahashi, H., Kasai, K., Kato, N., Yamawaki, S., Seymour, B., Kawato, M., Morimoto, J., & Okamoto, Y. (2020). Primary functional brain connections associated with melancholic major depressive disorder and modulation by antidepressants. Scientific reports, 10(1), [3542]. https://doi.org/10.1038/s41598-020-60527-z