Docosahexaenoic acid enhances M2 macrophage polarization via the p38 signaling pathway and autophagy
Kawano A, Ariyoshi W, Yoshioka Y, Hikiji H, Nishihara T, Okinaga T
Journal of cellular biochemistry · 76 citations
Review labels
Neutral facts our review recorded about how this study was done. They describe method, never whether we like the result.
How it was studied
- Design
- In vitro/mechanistic study (classified by our AI screen)
- Studied in
- Cells or lab samples
- Main outcome
- Mechanisms only
Who paid for it
- Funding
- Independent funding
- Government
- Japan Society for the Promotion of Science
- Government
- Scientific Research from the Japan Society for the Promotion of Science
- Grants
- Japan Society for the Promotion of Science (18K09556); Japan Society for the Promotion of Science (19K10340)
Based on 2 listed funder(s).
Publication
- Published
- 2019-03-01 · J Cell Biochem · vol. 120 · issue 8 · pp. 12604–12617
- Publisher
- Wiley
- Cited
- 92 citations · more than 94% of similar papers · 3.6× the field average
- Impact
- Top 10% most cited in its field
- References
- 44 works
- Access
- Paywalled
- Research areas
- Immune cells in cancer · IL-33, ST2, and ILC Pathways · Inflammasome and immune disorders
- Keywords
- Cell biology, Proinflammatory cytokine, Macrophage polarization, p38 mitogen-activated protein kinases, Docosahexaenoic acid, Signal transduction, Autophagy, U937 cell, MAPK/ERK pathway, M2 Macrophage, Biology, CD14, Inflammation, Chemistry, Macrophage, Biochemistry, Immune system, Immunology, Polyunsaturated fatty acid, Fatty acid
- MeSH
- u937 cells, macrophages, humans, inflammation, docosahexaenoic acids, anti-inflammatory agents, interleukin-4, map kinase signaling system, autophagy, thp-1 cells, kruppel-like factor 4
6 authors
From JP
- Aki KawanoKyushu Dental University
- Wataru AriyoshiKyushu Dental University
- Yoshie YoshiokaKyushu Dental University
- Hisako HikijiKyushu Dental University
- Tatsuji NishiharaKyushu Dental University
- Toshinori Okinaga · correspondingOsaka Dental University
Abstract
Macrophages, critical modulators of the immune response, polarize into various phenotypes, including M1 and M2. M1 macrophages are typically activated by lipopolysaccharide and produce proinflammatory cytokines. Conversely, M2 macrophages are activated by stimulation with interleukin 4 (IL)-4 and promote tissue remodeling and anti-inflammatory reactions. Recently, polyunsaturated fatty acids (PUFAs) have been shown to play important roles in the regulation of inflammation. Docosahexaenoic acid (DHA), a PUFA, has anti-inflammatory effects on chronic inflammatory disease, but its role in macrophage polarization remains unclear. In this study, we clarified the effects of DHA on macrophage polarization using U937 cells. Treatment with DHA resulted in upregulation of M2 macrophage markers and increased secretion of anti-inflammatory cytokines by U937 cells. IL-4, but not DHA, triggered phosphorylation of signal transducer and activator of transcription 6 (STAT6). DHA enhanced the expression of krüppel-like factor-4 (KLF4), a transcription factor involved in the regulation of macrophage polarization and increased the phosphorylation of p38 mitogen-activated protein kinase (MAPK). A selective inhibitor of p38 MAPK downregulated the expression of CD206 in DHA-treated U937 cells. Moreover, inhibitors of autophagy suppressed the phosphorylation of p38 MAPK and the expression of CD206 in DHA-treated U937 cells. Expression of microtubule-associated protein light chain 3-II, which is involved in autophagosome formation, was enhanced in DHA-treated U937 cells. Taken together, these results indicated that DHA enhanced the expression of M2 macrophage markers through the p38 MAPK signaling pathway and autophagy, suggesting that DHA regulates M2 macrophage polarization and plays an important role in innate immunity.
Abstract via Europe PMC. Copyright remains with the authors or publisher.
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