Wong ML, Dong C, Maestre-Mesa J, Licinio J. Polymorphisms in inflammation-related genes are associated with susceptibility to major depression and antidepressant response. Mol Psychiatry 13: 800-812

Department of Psychiatry and Behavioral Sciences, Center on Pharmacogenomics, University of Miami Miller School of Medicine, Miami, FL 33136, USA.
Molecular Psychiatry (Impact Factor: 14.5). 09/2008; 13(8):800-12. DOI: 10.1038/mp.2008.59
Source: PubMed


There are clinical parallels between the nature and course of depressive symptoms in major depressive disorder (MDD) and those of inflammatory disorders. However, the characterization of a possible immune system dysregulation in MDD has been challenging. Emerging data support the role of T-cell dysfunction. Here we report the association of MDD and antidepressant response to genes important in the modulation of the hypothalamic-pituitary-adrenal axis and immune functions in Mexican Americans with major depression. Specifically, single nucleotide polymorphisms (SNPs) in two genes critical for T-cell function are associated with susceptibility to MDD: PSMB4 (proteasome beta4 subunit), important for antigen processing, and TBX21 (T bet), critical for differentiation. Our analyses revealed a significant combined allele dose-effect: individuals who had one, two and three risk alleles were 2.3, 3.2 and 9.8 times more likely to have the diagnosis of MDD, respectively. We found associations of several SNPs and antidepressant response; those genes support the role of T cell (CD3E, PRKCH, PSMD9 and STAT3) and hypothalamic-pituitary-adrenal axis (UCN3) functions in treatment response. We also describe in MDD increased levels of CXCL10/IP-10, which decreased in response to antidepressants. This further suggests predominance of type 1 T-cell activity in MDD. T-cell function variations that we describe here may account for 47.8% of the attributable risk in Mexican Americans with moderate MDD. Immune function genes are highly variable; therefore, different genes might be implicated in distinct population groups.

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Available from: Chuanhui Dong, Jun 29, 2014
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    • "Finally, ethnicity may influence replication rates. Here, we studied individuals of Western European ancestry, whereas some of the candidate genes were firstly investigated in other populations such as Mexican-Americans or Asians [e.g., Wong et al., 2008; Dong et al., 2009; Kishi et al., 2009b]. Some of these genetic effects may not be consistent across different populations and this may have added to the non-replication rate in our sample. "

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    • "r suggested to induce GR resistance and trigger the inflammatory cascade ( Miller et al . , 2002 ; Raison et al . , 2006 ; Cohen et al . , 2012 ) . From the genetic perspective , polymorphisms in the genes PSMB4 ( proteasome β4 subunit ) and TBX21 ( T bet ) that result in T - cell dysfunction , were reported to contribute to the pathology of MDD ( Wong et al . , 2008 ; Berk et al . , 2013 ) . A recent meta - analysis of 28 studies identified significant associations between depression and infections in Borna disease virus ( BDV ) , herpes simplex virus - 1 , varicella zoster virus , Epstein - Bar virus ( EBV ) , and Chlamydophila trachomatis . Results indicated that patients with depression are 3 . 2"
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