Cited by 73Fatty Acid Research and HealthTryptophan and brain disordersNeuroinflammation and Neurodegeneration Mechanisms

Endogenous Omega (n)-3 Fatty Acids in Fat-1 Mice Attenuated Depression-Like Behavior, Imbalance between Microglial M1 and M2 Phenotypes, and Dysfunction of Neurotrophins Induced by Lipopolysaccharide Administration

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Gu, Minqing, Li, Yuyu, Tang, Haiting, Zhang, Cai, Li, Wende, Zhang, Yongping, Li, Yajuan, Zhao, Yuntao +1 more·2018·Nutrients

Abstract

n-3 polyunsaturated fatty acids (PUFAs) have been reported to improve depression. However, PUFA purities, caloric content, and ratios in different diets may affect the results. By using Fat-1 mice which convert n-6 to n-3 PUFAs in the brain, this study further evaluated anti-depressant mechanisms of n-3 PUFAs in a lipopolysaccharide (LPS)-induced model. Adult male Fat-1 and wild-type (WT) mice were fed soybean oil diet for 8 weeks. Depression-like behaviors were measured 24 h after saline or LPS central administration. In WT littermates, LPS reduced sucrose intake, but increased immobility in forced-swimming and tail suspension tests. Microglial M1 phenotype CD11b expression and concentrations of interleukin (IL)-1β, tumor necrosis factor (TNF)-α, and IL-17 were elevated, while M2 phenotype-related IL-4, IL-10, and transforming growth factor (TGF)-β1 were decreased. LPS also reduced the expression of brain-derived neurotrophic factor (BDNF) and tyrosine receptor kinase B (Trk B), while increasing glial fibrillary acidic protein expression and pro-BDNF, p75, NO, and iNOS levels. In Fat-1 mice, LPS-induced behavioral changes were attenuated, which were associated with decreased pro-inflammatory cytokines and reversed changes in p75, NO, iNOS, and BDNF. Gas chromatography assay confirmed increased n-3 PUFA levels and n-3/n-6 ratios in the brains of Fat-1 mice. In conclusion, endogenous n-3 PUFAs may improve LPS-induced depression-like behavior through balancing M1 and M2-phenotypes and normalizing BDNF function.

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  • Preclinical studies in rodents show that IL-17A administration induces depressive-like behaviors and stress exposure elevates IL-17A levels.

    “Preclinical studies in rodents corroborate these findings, showing that IL-17A administration induces depressive-like behaviors [48] and stress exposure elevates IL-17A levels [66,67,68,69].”

    From Comparative Analysis of HPA-Axis Dysregulation and Dynamic Molecular Mechanisms in Acute Versus Chronic Social Defeat Stress (2025) · cites this paper as [67]

    Results §3.3 reports elevated hippocampal IL-17 in mice after LPS injection, alongside the depression-like behaviors described in the Discussion. It does not show that stress exposure elevates IL-17A: the Discussion’s example of a stress-related cytokine increase concerns IL-13 after acute foot shock. The paper also does not report administering IL-17A to induce depressive-like behavior. (LLM, conf=0.78)

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Authors
Gu, M., Li, Y., Tang, H., Zhang, C., Li, W., Zhang, Y., Li, Y., Zhao, Y., & Song, C.
Affiliations
  • Guangdong Ocean University (CN)
  • Guangdong Medical College (CN)
  • Research Institute for Marine Drug and Nutrition, College of Food Science and Technology, Guangdong Ocean University, Zhanjiang 524088, China
  • Dalhousie University (CA)
Corresponding author
Song, Cai
Venue
Nutrients
Publisher
MDPI AG
Published
2018-09-21
Volume
10
Issue
10
Pages
1351
ISSN
2072-6643 (ISSN-L)
OpenAlex
W2890491720
Cited by
73
References
59
Citations by year
2026: 6 · 2025: 8 · 2024: 5 · 2023: 16 · 2022: 12 · 2021: 9 · 2020: 12 · 2019: 4
FWCI
5.17
Type
journal article
Language
en
Open access
Locations
  • Nutrients (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, other-oa)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
Funders
  • National Natural Science Foundation of China (81471223)
  • Guangdong Science and Technology Department (2016B020235001 and 2016A020215153)
  • Shenzhen Dapeng District industrial development special funds for science and technology support project (KY20170210)
Topics
  • Health Sciences › Nursing › Nutrition and Dietetics › Fatty Acid Research and Health
  • Life Sciences › Neuroscience › Biological Psychiatry › Tryptophan and brain disorders
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
Keywords
omega-3 fatty acids, fat-1 mice, depression-like behavior, lipopolysaccharide, neuroinflammation, brain-derived neurotrophic factor, proBDNF, p75 neurotrophin receptor, nitric oxide, inducible nitric oxide synthase, n-6/n-3 ratio, anti-inflammatory cytokines, neuroprotection
MeSH terms
Animals, Behavior, Animal, Brain, Depression, Depressive Disorder, Diet, Glial Fibrillary Acidic Protein, Inflammation, Lipopolysaccharides, Membrane Glycoproteins, Mice, Inbred C57BL, Mice, Transgenic, Nerve Growth Factors, Phenotype, Protein-Tyrosine Kinases, Swimming, Fatty Acids, Omega-3, Cytokines, Microglia, Brain-Derived Neurotrophic Factor, Hindlimb Suspension, Receptor, trkB, Caenorhabditis elegans Proteins, CD11b Antigen, Fatty Acids, Omega-6, Fatty Acid Desaturases

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