Quantitative relationships between dietary linoleate and prostaglandin (eicosanoid) biosynthesis

Area of Science:

• Biochemistry
• Nutrition Science

Background:

• Essential fatty acids are crucial for various physiological processes.
• Eicosanoids are potent signaling molecules derived from fatty acids.
• Dietary fatty acid composition significantly influences eicosanoid production.

Purpose of the Study:

• To investigate the impact of essential fatty acid deficiency on eicosanoid biosynthesis.
• To review the effects of dietary linoleate supplementation on eicosanoid production.
• To explore the mechanisms underlying alterations in eicosanoid synthesis.

Main Methods:

• Analysis of tissue fatty acid composition.
• Measurement of eicosanoid biosynthesis (prostaglandins, thromboxane) in whole blood, lung, liver, and heart.
• Feeding diets with varying concentrations of linoleate (0-27% energy).

Main Results:

• Essential fatty acid deficiency consistently decreased eicosanoid biosynthesis.
• Tissue fatty acid analysis showed decreased arachidonate and increased eicosatrienoate (n-9) in deficient states.
• Dietary linoleate supplementation yielded variable results, with documented increases, decreases, or no change in eicosanoid production.
• Evidence linking precursor fatty acid changes to eicosanoid alterations was inconsistent.

Conclusions:

• Essential fatty acid deficiency profoundly impacts eicosanoid biosynthesis.
• The effects of linoleate supplementation on eicosanoid production are complex and not fully understood.
• Appropriate sampling techniques for eicosanoid studies are likely species, gender, and tissue-specific and require further establishment.