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Omega Fatty Acid Balance Can Alter Immunity And Gene Expression

Date:
June 2, 2009
Source:
American Society for Biochemistry and Molecular Biology
Summary:
Using a controlled diet study with human volunteers, researchers may have teased out a biological basis for the increased inflammation observed due to humans' shift in their consumption of omega fatty acids.

For the past century, changes in the Western diet have altered the consumption of omega-6 fatty acids (w6, found in meat and vegetable oils) compared with omega-3 fatty acids (w3, found in flax and fish oil). Many studies seem to indicate this shift has brought about an increased risk of inflammation (associated with autoimmunity and allergy), and now using a controlled diet study with human volunteers, researchers may have teased out a biological basis for these reported changes.

Anthropological evidence suggests that human ancestors maintained a 2:1 w6/w3 ratio for much of history, but in Western countries today the ratio has spiked to as high as 10:1. Since these omega fatty acids can be converted into inflammatory molecules, this dietary change is believed to also disrupt the proper balance of pro- and anti- inflammatory agents, resulting in increased systemic inflammation and a higher incidence of problems including asthma, allergies, diabetes, and arthritis.

Floyd Chilton and colleagues wanted to examine whether theses fatty acids might have other effects, and developed a dietary intervention strategy in which 27 healthy humans were fed a controlled diet mimicking the w6/w3 ratios of early humans over 5 weeks. They then looked at the gene levels of immune signals and cytokines (protein immune messengers), that impact autoimmunity and allergy in blood cells and found that many key signaling genes that promote inflammation were markedly reduced compared to a normal diet, including a signaling gene for a protein called PI3K, a critical early step in autoimmune and allergic inflammation responses.

This study demonstrates, for the first time in humans, that large changes in gene expression are likely an important mechanism by which these omega fatty acids exert their potent clinical effects.


Story Source:

The above story is based on materials provided by American Society for Biochemistry and Molecular Biology. Note: Materials may be edited for content and length.


Journal Reference:

  1. Weaver et al. Effect of dietary fatty acids on inflammatory gene expression in healthy humans. Journal of Biological Chemistry, 2009; DOI: 10.1074/jbc.M109.004861

Cite This Page:

American Society for Biochemistry and Molecular Biology. "Omega Fatty Acid Balance Can Alter Immunity And Gene Expression." ScienceDaily. ScienceDaily, 2 June 2009. <www.sciencedaily.com/releases/2009/05/090529183250.htm>.
American Society for Biochemistry and Molecular Biology. (2009, June 2). Omega Fatty Acid Balance Can Alter Immunity And Gene Expression. ScienceDaily. Retrieved September 19, 2014 from www.sciencedaily.com/releases/2009/05/090529183250.htm
American Society for Biochemistry and Molecular Biology. "Omega Fatty Acid Balance Can Alter Immunity And Gene Expression." ScienceDaily. www.sciencedaily.com/releases/2009/05/090529183250.htm (accessed September 19, 2014).

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