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Tetracosahexaenoic acid (THA; 24:6n-3) is a natural, n-3 highly unsaturated fatty acid (n-3HUFA) that exists in fish, including Baltic herring (Clupea harengus) and the flathead flounder (Hippoglossoides dubius). In this study, natural n-3HUFAs, i.d. eicosapentaenoic acid (EPA, 20:5n-3), docosahexaenoic acid (DHA, 22:6n-3), and THA were administrated to C57BL/KsJ-db/db mice for 4 weeks and the liver and serum lipid profiles, hepatic enzyme activity, expression of mRNA related to lipid metabolism, and adiponectin serum levels were then analyzed. The results showed that THA had the highest activity in suppressing hepatic triglyceride (TG) accumulation and increase in liver weight among the test groups. Furthermore, THA increased adiponectin levels in serum. These results indicate that THA is an excellent natural n-3HUFA that can suppress the development of metabolic syndromes and circulatory system diseases. The order of the n-3HUFA activity was THA &gt; DHA &gt; EPA in almost all the factors examined here. In a previous study of ours, the order was DHA &gt; DPA &gt; EPA, so the final order was summarized as THA &gt; DHA &gt; DPA &gt; EPA. This order clearly translates to the rule that "the number of double bonds and carbon atoms in the n-3HUFA structure relates to their clinical functions".

Metabolism of Natural Highly Unsaturated Fatty Acid, Tetracosahexaenoic Acid (24:6n-3), in C57BL/KsJ-<i>db</i>/<i>db</i> Mice