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Prog Neuropsychopharmacol Biol Psychiatry. 2018 Jan 3;80(Pt C):227-233. doi: 10.1016/j.pnpbp.2017.06.020. Epub 2017 Jun 23.

Eicosapentaenoic and docosahexaenoic acids have different effects on peripheral phospholipase A2 gene expressions in acute depressed patients.

Author information

1
Mind-Body Interface Laboratory (MBI-Lab) & Department of Psychiatry, China Medical University Hospital, Taichung, Taiwan; Institute of Psychiatry, King's College London, UK; College of Medicine & Brain Disease Research Center (BDRC), China Medical University Hospital, Taichung, Taiwan. Electronic address: cobolsu@gmail.com.
2
College of Biopharmaceutical and Food Sciences, China Medical University, Taichung, Taiwan.
3
Mind-Body Interface Laboratory (MBI-Lab) & Department of Psychiatry, China Medical University Hospital, Taichung, Taiwan; Institute of Psychiatry, King's College London, UK; College of Medicine & Brain Disease Research Center (BDRC), China Medical University Hospital, Taichung, Taiwan.
4
Mind-Body Interface Laboratory (MBI-Lab) & Department of Psychiatry, China Medical University Hospital, Taichung, Taiwan; College of Medicine & Brain Disease Research Center (BDRC), China Medical University Hospital, Taichung, Taiwan.
5
Mind-Body Interface Laboratory (MBI-Lab) & Department of Psychiatry, China Medical University Hospital, Taichung, Taiwan.
6
Medical University of Łódź, Łódź, Poland.
7
Institute of Psychiatry, King's College London, UK.

Abstract

INTRODUCTION:

Omega-3 polyunsaturated fatty acids (PUFAs) have been proven critical in the development and management of major depressive disorder (MDD) by a number of epidemiological, clinical and preclinical studies, but the molecular mechanisms underlying this therapeutic action are yet to be understood. Although eicosapentaenoic acid (EPA) seems to be the active component of omega-3 PUFAs' antidepressant effects, the biological research about the difference of specific genetic regulations between EPA and docosahexaenoic acid (DHA), the two main components of omega-3 PUFAs, is still lacking in human subjects.

METHODS:

We conducted a 12-week randomized-controlled trial comparing the effects of EPA and DHA on gene expressions of phospholipase A2 (cPLA2) and cyclooxygenase-2 (COX2), serotonin transporter (5HTT), and Tryptophan hydroxylase 2 (TPH-2) in 27 MDD patients. In addition, the erythrocyte PUFA compositions and the candidate gene expressions were also compared between these 27 MDD patients and 22 healthy controls.

RESULTS:

EPA was associated with a significant decrease in HAM-D scores (CI: -13 to -21, p<0.001) and significant increases in erythrocyte levels of EPA (CI: +1.0% to +2.9%, p=0.001) and DHA (CI: +2.9% to +5.6%, p=0.007). DHA treatment was associated with a significant decrease in HAM-D scores (CI: -6 to -14, p<0.001) and a significant increase in DHA levels (CI: +0.2% to +2.3%, p=0.047), but not of EPA levels. The cPLA2 gene expression levels were significantly increased in patients received EPA (1.9 folds, p=0.038), but not DHA (1.08 folds, p=0.92). There was a tendency for both EPA and DHA groups to decrease COX-2 gene expressions. The gene expressions of COX-2, cPLA2, TPH-2 and 5-HTT did not differ between MDD cases and healthy controls.

CONCLUSIONS:

EPA differentiates from DHA in clinical antidepressant efficacy and in upregulating cPLA2 gene regulations, which supports the clinical observation showing the superiority of EPA's antidepressant effects.

TRIAL REGISTRATION:

ClinicalTrials.gov identifier: NCT02615405.

KEYWORDS:

Docosahexaenoic acid (DHA); Eicosapentaenoic acid (EPA); Gene expressions; Major depressive disorder (MDD); Omega-3 polyunsaturated fatty acids (n-3 PUFAs); Phospholipase A2 (PLA2)

PMID:
28648567
DOI:
10.1016/j.pnpbp.2017.06.020
[Indexed for MEDLINE]

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