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Omega3 polyunsaturated fatty acids and maize flour diets.

I Fernandez¹, A N Pallaro, N H Slobodianik

¹Laboratory of Experimental Nutrition, Department of Nutrition, School of Pharmacy and Biochemistry, University of Buenos Aires, Buenos Aires, Argentina. ferni@ffyb.uba.ar

Nutrition (Burbank, Los Angeles County, Calif.)

|December 18, 2001

Summary

Supplementing a maize protein diet with omega-3 fatty acids (24 mg/d) restored thymus cell proliferation and T-cell numbers in rats. This dietary adjustment did not negatively impact lipid profiles or liver oxidative stress.

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Area of Science:

Nutrition Science
Immunology
Biochemistry

Background:

Maize protein diets, unbalanced in essential amino acids, can impair thymus function and cellular development in growing rats.
This nutritional deficiency leads to arrested thymus cell proliferation and maturation, impacting the immune system.
Omega-3 polyunsaturated fatty acids are known for their anti-inflammatory and immunomodulatory properties.

Purpose of the Study:

To investigate the effects of supplementing a 6.5% maize protein diet with varying amounts of omega-3 polyunsaturated fatty acids on thymus cellularity, plasma lipids, and hepatic tissue.
To determine the optimal dosage of omega-3 fatty acids required to counteract the negative effects of the maize protein diet.
To assess the impact of omega-3 supplementation on immune cell populations and metabolic parameters.

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Main Methods:

Growing rats were fed a 6.5% maize protein diet with or without omega-3 polyunsaturated fatty acid supplementation (0, 12, or 24 mg/d) for 9 days.
A control group received a standard stock diet.
Thymus cell number, T-cell counts (W3/13 antibody), plasma lipid profiles (total cholesterol, triacylglycerols, HDL, LDL), and hepatic oxidative stress markers were analyzed.

Main Results:

Diet supplementation with 24 mg/d of omega-3 fatty acids (M2 group) restored thymus cell number and absolute T-cell counts to levels comparable to the control group.
No significant differences were observed in plasma high-density lipoprotein (HDL) and low-density lipoprotein (LDL) cholesterol levels among any of the dietary groups.
Hepatic lipid peroxidation, an indicator of oxidative stress, showed no statistical differences across the maize protein diet groups and the control group.

Conclusions:

Supplementation of a 6.5% maize protein diet with 24 mg/d of omega-3 polyunsaturated fatty acids effectively restores thymus cell proliferation and T-cell numbers.
This level of omega-3 supplementation does not adversely affect plasma lipid profiles or induce hepatic lipid peroxidation.
Omega-3 fatty acids show potential in mitigating the adverse effects of imbalanced protein diets on thymus immune cell development.