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Dietary n-3-Polyunsaturated Fatty Acid Deprivation and Cytokine Signaling Pathways in the Brain

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Abstract

The innate immune system of the brain is principally composed of microglial cells and astrocytes, which, once activated, protect neurons against insults (infectious agents, lesions, etc.). Activated glial cells produce inflammatory cytokines that act specifically through receptors expressed by the brain, leading to the development of behavioral disorders including depressive behavior and cognitive alterations. These behavioral alterations cease along with the synthesis of brain cytokines. When the level of expression of these cytokines remains high, they become toxic to neurons and can lead to their death, as in the case of neurodegenerative disorders like Alzheimer’s disease. Omega3 (ω3) type polyunsaturated fatty acids (PUFAs) are essential nutrients and essential components of neuronal and glial cell membranes. Additionally, they have powerful immunomodulatory properties and regulate the cytokines and their signaling pathways. They accumulate in the brain during the perinatal period in a dietary supply-dependant fashion. Their brain levels diminish with age, but can be corrected by a diet enriched in ω3 PUFAs. The increasing exposure of the population to “fast-food” type diets, extremely unbalanced in ω3 PUFAs, could contribute to the fragilization of the brain with respect to cytokines.

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Abbreviations

15d-PGJ2:

15-deoxy-delta 12,14-prostaglandin J2

AA:

Arachidonic acid

ALA:

Alpha linolenic acid

BBB:

Blood brain barrier

CNS:

Central nervous system

COX:

Cyclooxygenase

cPLA2:

Calcium-dependent phospholipase A2

DHA:

Docosahexaenoic acid

DPA:

Docosapentaenoic acid

EPA:

Eicosapentaenoic acid

ERK:

Extracellular signal-regulated protein kinase

GFAP:

Glial fibrillary acidic protein

HEPE:

Hydroxyeicosapentaenoic acid

IKK:

IκB kinase

IL-1:

Interleukin 1

IL-10:

Interleukin 10

IL-1R:

Interleukin 1 receptor

IL-1ra:

Interleukin 1 receptor antagonist

IL-1RAcP:

Interleukin 1 receptor accessory protein

IL-6:

Interleukin 6

IL-6R:

Interleukin 6 receptor

iPLA2:

Calcium-independent phospholipase A2

IRAK:

Interleukin-1 receptor associated kinase

IκB:

Inhibitor of κB

JAK:

Janus kinase

JNK:

c-Jun N-terminal kinase

LA:

Linoleic acid

LOX:

Lipoxygenase

LPS:

Lipopolysaccharide

LT:

Leukotriene

LTP:

Long-term potentiation

LXA4:

Lipoxin A4

LXR:

Liver X receptor

MAPK:

Mitogen associated protein (MAP) kinase

MHCII:

Class II major histocompatibility complex

MK:

MAPK-activated protein kinase

MyD88:

Myeloid differentiation primary response gene (88)

NEMO:

NFκB essential modulator

NFκB:

Nuclear factor kappa B

NIK:

NFκB inducing kinase

PAMP:

Pathogen-associated molecular patterns

PC:

Phosphatidylcholine

PE:

Phosphatidylethanolamine

PG:

Prostaglandin

PGE2:

Prostaglandin E2

PGI:

Prostacyclin

PPAR:

Peroxisome proliferator-activated receptor

PUFA:

Polyunsaturated fatty acid

RXR:

Retinoid X receptor

SAMP8:

Senescence-accelerated prone mouse

STAT:

Signal transducers and activators of transcription

TACE:

TNFα cleavage enzyme

TLR4:

Toll-like receptor 4

TNFR:

Tumor necrosis factor receptor

TNFα:

Tumor necrosis factor alpha

TRADD:

TNFR1-associated via death domain

TRAF-6:

TNF receptor associated factor 6

TX:

Thromboxane

Tyk:

Tyrosine kinase 2

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Acknowledgment

Supported by INRA, CNRS, University of Bordeaux 2, the region Aquitaine and ANR grant ALIA.

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Correspondence to Sophie Laye .

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© 2011 Springer Science+Business Media, LLC

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Laye, S., Labrousse, V.F., De Smedt-Peyrusse, V. (2011). Dietary n-3-Polyunsaturated Fatty Acid Deprivation and Cytokine Signaling Pathways in the Brain. In: Preedy, V., Watson, R., Martin, C. (eds) Handbook of Behavior, Food and Nutrition. Springer, New York, NY. https://doi.org/10.1007/978-0-387-92271-3_115

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  • DOI: https://doi.org/10.1007/978-0-387-92271-3_115

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  • Publisher Name: Springer, New York, NY

  • Print ISBN: 978-0-387-92270-6

  • Online ISBN: 978-0-387-92271-3

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