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United States Department of Agriculture

Agricultural Research Service

Related Topics

Research Project: Metabolism and Health Effects of Phospholipid and Triglyceride Forms of Omega-3 Polyunsaturated Fatty Acids

Location: Immunity and Disease Prevention Research

Project Number: 2032-51530-024-00-D
Project Type: In-House Appropriated

Start Date: Apr 13, 2015
End Date: Apr 12, 2020

Objective:
Objective 1: Determine the differential metabolism and uptake of n-3 fatty acids from dietary phospholipid and triglyceride forms in different tissues. -Sub-objective 1A: Determine the differential uptake and accretion of PL and TG forms of DHA in different mouse tissues. - Sub-objective 1B: Compare the metabolism of PL and TG forms of DHA in different mouse tissues. - Sub-objective 1C: Determine whether the differential accretion of DHA in brain from the PL and TG forms will result in differences in mouse behavior. Objective 2: Compare the anti-inflammatory and immune-modulating ability of n-3 fatty acids from dietary phospholipid and triglyceride forms in different tissues. -Sub-objective 2A: Compare the anti-inflammatory and immune-modulating ability of PL and TG forms of DHA by using experimental allergic encephalopathy (EAE)as a mouse model of brain inflammation. - Sub-objective 2B: Compare the anti-inflammatory and immune-modulating ability of PL and TG forms of DHA in the prevention of diet-induced NAFLD in mice.

Approach:
Proposed experiments will compare accretion, metabolism and health effects n-3 fatty acids from the phospholipid (PL) and the triglyceride (TG) forms in different mouse tissues. For objective 1, we will determine the dose dependent accretion and metabolism of the PL-DHA and TG-DHA in the mouse tissues and their effects on the behavioral responses. We hypothesize that tissue accretion of DHA will increase with its increased intake, and at a given dose it will be greater in the PL group than in the TG group for tissues which express mfsd2a transporter (brain and liver) and will be similar in tissues (heart, muscle, and adipose tissue) that do not express this transporter. We also hypothesize that concentration of DHA in different lipid classes and PL subclasses, and that of DHA metabolites will be a function of tissue DHA concentration, and that DHA will improve learning and memory, and decrease fear and anxiety induced stress; effects of PL-DHA will be greater than that of TG-DHA on the behavioral responses tested. For objective 2, we will compare anti-inflammatory and immune-modulating effects of single equivalent dose (based on the results of objective 1) of the PL- and TG-DHA on brain and liver. For studies with brain we will use the mouse model of experimental allergic encephalomyelitis (EAE), and for liver we will use the high fat and high sucrose diets fed mouse model of nonalcoholic fatty liver disease (NAFLD). We hypothesize that both forms of DHA will delay the onset and severity of EAE and NAFLD when compared with the control groups, and PL-DHA will be more effective than TG-DHA. We anticipate our results will support the proposed hypotheses, however, if DHA does not have any effect on the response variables tested, we may repeat some experiments by increasing the duration of feeding. Whether or not the two forms of DHA differ in their effects on the responses tested will be equally useful information. A variety of behavioral, biochemical, molecular, immunohistochemistry, flowcytometery, and other analytical methods will be used. The mouse models and the methods proposed here have been previously used in our or our collaborator’s laboratories.

Last Modified: 09/20/2017
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