When hens are given omega-3 supplements, the total omega-3 fatty acids in their eggs increase, but the amount of DHA in the chick's heart tissue does not rise, showing that DHA is not incorporated...
Mechanism
Synthesis from 1 study
The chick's heart takes in omega-3 fats from its mother's diet, but it only uses one type, EPA, to build its cell membranes. It leaves out another type, DHA, even when there's plenty available. Other parts of the body, like the brain, use DHA, but the heart does not.
Most probable mechanism
When a mother consumes more omega-3 fats, her eggs contain more of these fats, and the chick's body absorbs them into its tissues. But in the heart, the tissue takes in more of one type of omega-3 called EPA and leaves out another called DHA, even though both are present. This happens because the heart's cells have a preference for using EPA to build their membranes and may not have the tools to bring in or keep DHA. Other organs like the brain and liver do take in DHA, but the heart does not.
Maternal dietary omega-3 fatty acids are incorporated into egg yolk lipids, increasing total long-chain omega-3 content in the egg
Chick cardiac tissue absorbs total omega-3 fatty acids from the yolk and incorporates them into phospholipid membranes
Eicosanoid precursor fatty acids in cardiac tissue show increased levels of EPA but unchanged levels of DHA despite higher total omega-3 intake
Cardiac phospholipid synthesis enzymes or transporters preferentially utilize EPA over DHA for membrane integration
DHA is either not transported into cardiac cells, is rapidly metabolized, or is excluded from phospholipid remodeling pathways in cardiac tissue
Evidence from Studies
Supporting (1)
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