PMID- 37991535 OWN - NLM STAT- Publisher LR - 20231122 IS - 1433-8491 (Electronic) IS - 0940-1334 (Linking) DP - 2023 Nov 22 TI - Effect modification of tumor necrosis factor-alpha on the kynurenine and serotonin pathways in major depressive disorder on type 2 diabetes mellitus. LID - 10.1007/s00406-023-01713-8 [doi] AB - Major depressive disorder (MDD) is strongly associated with type 2 diabetes mellitus (T2DM). The kynurenine and serotonin pathways, as well as chronic low-grade inflammation, are being considered potential links between them. MDD associated with T2DM is less responsive to treatment than that without T2DM; however, the underlying mechanism remains unknown. We aimed to investigate the effects of inflammatory cytokines on the kynurenine and serotonin pathways in patients with comorbid MDD and T2DM and those with only MDD. We recruited 13 patients with comorbid MDD and T2DM and 27 patients with only MDD. We measured interleukin-6 and tumor necrosis factor-alpha (TNF-alpha) levels as inflammatory cytokines and metabolites of the kynurenine pathway and examined the relationship between the two. TNF-alpha levels were significantly higher in patients with comorbid MDD and T2DM than in those with only MDD in univariate (p = 0.044) and multivariate (adjusted p = 0.036) analyses. TNF-alpha showed a statistically significant effect modification (interaction) with quinolinic acid/tryptophan and serotonin in patients from both groups (beta = 1.029, adjusted p < 0.001; beta = - 1.444, adjusted p = 0.047, respectively). Limitations attributed to the study design and number of samples may be present. All patients were Japanese with mild to moderate MDD; therefore, the generalizability of our findings may be limited. MDD with T2DM has more inflammatory depression components and activations of the kynurenine pathway by inflammatory cytokines than MDD without T2DM. Hence, administering antidepressants and anti-inflammatory drugs in combination may be more effective in patients with comorbid MDD and T2DM. CI - (c) 2023. The Author(s). FAU - Okamoto, Naomichi AU - Okamoto N AUID- ORCID: 0000-0003-2791-8113 AD - Department of Psychiatry, University of Occupational and Environmental Health, 807-8555, Kitakyushu, Fukuoka, 8078555, Japan. nokamoto@med.uoeh-u.ac.jp. FAU - Hoshikawa, Takashi AU - Hoshikawa T AD - Department of Psychiatry, University of Occupational and Environmental Health, 807-8555, Kitakyushu, Fukuoka, 8078555, Japan. FAU - Honma, Yuichi AU - Honma Y AD - Third Department of Internal Medicine, University of Occupational and Environmental Health, Fukuoka, Japan. FAU - Chibaatar, Enkhmurun AU - Chibaatar E AD - Department of Psychiatry, University of Occupational and Environmental Health, 807-8555, Kitakyushu, Fukuoka, 8078555, Japan. FAU - Ikenouchi, Atsuko AU - Ikenouchi A AD - Department of Psychiatry, University of Occupational and Environmental Health, 807-8555, Kitakyushu, Fukuoka, 8078555, Japan. AD - Medical Center for Dementia, University Hospital, University of Occupational and Environmental Health, Fukuoka, Japan. FAU - Harada, Masaru AU - Harada M AD - Third Department of Internal Medicine, University of Occupational and Environmental Health, Fukuoka, Japan. FAU - Yoshimura, Reiji AU - Yoshimura R AD - Department of Psychiatry, University of Occupational and Environmental Health, 807-8555, Kitakyushu, Fukuoka, 8078555, Japan. LA - eng GR - 18K07576/Ministry of Health, Labour and Welfare/ PT - Journal Article DEP - 20231122 PL - Germany TA - Eur Arch Psychiatry Clin Neurosci JT - European archives of psychiatry and clinical neuroscience JID - 9103030 SB - IM OTO - NOTNLM OT - Inflammatory cytokine OT - Kynurenine pathway OT - Major depressive disorder OT - Tryptophan metabolism OT - Tumor necrosis factor-alpha OT - Type 2 diabetes mellitus EDAT- 2023/11/22 12:43 MHDA- 2023/11/22 12:43 CRDT- 2023/11/22 11:05 PHST- 2023/08/17 00:00 [received] PHST- 2023/10/29 00:00 [accepted] PHST- 2023/11/22 12:43 [medline] PHST- 2023/11/22 12:43 [pubmed] PHST- 2023/11/22 11:05 [entrez] AID - 10.1007/s00406-023-01713-8 [pii] AID - 10.1007/s00406-023-01713-8 [doi] PST - aheadofprint SO - Eur Arch Psychiatry Clin Neurosci. 2023 Nov 22. doi: 10.1007/s00406-023-01713-8.