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Interleukin 17 selectively predicts better outcomes with bupropion-SSRI combination: Novel T cell biomarker for antidepressant medication selection.
Brain, Behavior, and Immunity 2017 November
BACKGROUND: Interleukin 17 (IL-17) is produced by highly inflammatory Th17 cells and has been implicated in pathophysiology of depression. IL-17 putatively disrupts the blood brain barrier and affects dopamine synthesis whereas dopamine has been shown to decrease Th17 cell-mediated immune response. Nevertheless, whether IL-17 can predict differential treatment outcome with antidepressants modulating dopaminergic transmission is unknown.
METHODS: IL-17 and other T cell and non-T cell markers (Th1, Th2 and non-T cell markers) were measured with the Bioplex Pro™ human cytokine 27-plex kit in the Combining Medications to Enhance Depression Outcomes (CO-MED) trial participants who provided baseline plasma and were treated with either bupropion plus escitalopram (bupropion-SSRI), escitalopram plus placebo (SSRI monotherapy), or venlafaxine plus mirtazapine (n=166). Differential changes in symptom severity and side-effects based on levels of IL-17 and other T and non-T cell markers were tested using a treatment-arm-by-biomarker interaction in separate repeated measures mixed model analyses. Subsequent analyses stratified by treatment arm were conducted for those markers with a significant interaction.
RESULTS: There was a significant treatment-arm-by-IL-17 interaction for depression severity (p=0.037) but not for side-effects (p=0.28). Higher baseline IL-17 level was associated with greater reduction in depression severity (effect size=0.78, p=0.008) in the bupropion-SSRI but not the other two treatment arms. Other T and non-T cell markers were not associated with differential treatment outcomes.
CONCLUSION: Higher baseline levels of IL-17 are selectively associated with greater symptomatic reduction in depressed patients treated with bupropion-SSRI combination.
METHODS: IL-17 and other T cell and non-T cell markers (Th1, Th2 and non-T cell markers) were measured with the Bioplex Pro™ human cytokine 27-plex kit in the Combining Medications to Enhance Depression Outcomes (CO-MED) trial participants who provided baseline plasma and were treated with either bupropion plus escitalopram (bupropion-SSRI), escitalopram plus placebo (SSRI monotherapy), or venlafaxine plus mirtazapine (n=166). Differential changes in symptom severity and side-effects based on levels of IL-17 and other T and non-T cell markers were tested using a treatment-arm-by-biomarker interaction in separate repeated measures mixed model analyses. Subsequent analyses stratified by treatment arm were conducted for those markers with a significant interaction.
RESULTS: There was a significant treatment-arm-by-IL-17 interaction for depression severity (p=0.037) but not for side-effects (p=0.28). Higher baseline IL-17 level was associated with greater reduction in depression severity (effect size=0.78, p=0.008) in the bupropion-SSRI but not the other two treatment arms. Other T and non-T cell markers were not associated with differential treatment outcomes.
CONCLUSION: Higher baseline levels of IL-17 are selectively associated with greater symptomatic reduction in depressed patients treated with bupropion-SSRI combination.
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