Acute changes in dietary omega-3 fatty acid intake lowers soluble interleukin-6 receptor in healthy adult normal weight and overweight males.
OBJECTIVE
To determine the effect of a short-term isocaloric exchange of alpha-linolenic acid (ALA, 18:3n3) for linoleic acid (LA, 18:2n6) on fasting levels of soluble interleukin-6 receptor (sIL6R), and soluble tumor necrosis factor-alpha receptors 1 and 2 (sTNFR1 and sTNFR2) in healthy normal weight and overweight/obese adult males.


METHODS
Four-day clinical intervention study with 0.5% or 5% of total energy from ALA. Fasting (10 h) blood samples were obtained on the morning of day 5 in both diet treatments to measure sTNFR1, sTNFR2, and sIL6R.


METHODS
Nine normal weight (BMI < 25 kg/m2) and seven overweight (BMI > or = 25 kg/m2) healthy males.


RESULTS
Fasting sIL6R decreased significantly from the control (C) diet following four days on the high ALA isocaloric (ISO) diet in normal weight and overweight/obese subjects (normal weight: C = 34.89 +/- 3.17 ng/ml, ISO = 30.91 +/- 2.24 ng/ml, p < 0.05; overweight/obese: C = 38.19 +/- 3.92 ng/ml, ISO = 33.57 +/- 2.47 ng/ml, p , 0.05). The dietary intervention did not have a significant effect on fasting sTNFR1 or sTNFR2.


CONCLUSIONS
The results suggest that an isocaloric exchange of ALA for LA can reduce fasting sIL6R concentration by approximately 11% after a four-day dietary intervention in both overweight/obese and normal weight subjects. The data also suggest that longer exposure to a similar diet may have the potential to reduce inflammatory burden and thus lower the risk of both cardiovascular disease as well as diabetes.
Nelson
Tracy L
TL
Human Performance Clinical/Research Laboratory, Department of Health and Exercise Science, Colorado State University, 220 Moby, Fort Collins, CO 80523, USA. tnelson@cahs.colostate.edu
Hickey
Matthew S
MS
D000328:Adult; D015992:Body Mass Index; D001835:Body Weight / Q000502:physiology*; D006801:Humans; D015850:Interleukin-6 / Q000378:metabolism; D019787:Linoleic Acid / Q000378:metabolism*; D008297:Male; D008875:Middle Aged; D019947:Receptors, Interleukin-6 / Q000378:metabolism*; D047888:Receptors, Tumor Necrosis Factor, Type I / Q000378:metabolism; D047889:Receptors, Tumor Necrosis Factor, Type II / Q000378:metabolism; D017962:alpha-Linolenic Acid / Q000378:metabolism*
D015850:Interleukin-6; D019947:Receptors, Interleukin-6; D047888:Receptors, Tumor Necrosis Factor, Type I; D047889:Receptors, Tumor Necrosis Factor, Type II; D017962:alpha-Linolenic Acid; D019787:Linoleic Acid