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Tomato therapy: Engineered veggies target intestinal lipids, improve cholesterol
Date:11/13/2013

UCLA researchers report that tiny amounts of a specific type of lipid in the small intestine may play a greater role than previously thought in generating the high cholesterol levels and inflammation that lead to clogged arteries.

The team also found they could reduce the negative effects of these lipids in mice by feeding the animals a new genetically engineered tomato being developed at UCLA that is designed to mimic HDL ("good") cholesterol.

The study, in the December issue of the Journal of Lipid Research with an accompanying editorial, focused on a group of lipids found in the small intestine called unsaturated lysophosphatidic acids (LPAs).

"These lipids may be a new culprit that we can target in the small intestine in fighting atherosclerosis," said senior author Dr. Alan Fogelman, executive chair of the department of medicine and director of the atherosclerosis research unit at the David Geffen School of Medicine at UCLA.

Big effect of small amount of LPA

Previously, it was thought that the role of the small intestine in response to a high-fat, high-cholesterol diet was simply to package the fat and cholesterol for transport to the liver. Once delivered to the liver, the large load of fat was thought to cause increased blood levels of LDL ("bad") cholesterol, decreased levels of "good" cholesterol and the rise of systemic inflammation.

But that may not be the complete story. The UCLA researchers revealed that LPAs, previously considered very minor because they are found in far smaller amounts in the small intestine than other lipids, like cholesterol, may play a more direct role in contributing to the factors that cause atherosclerosis.

Scientists found that mice fed a high-fat, high-cholesterol diet (21 percent fat) showed a two-fold increase in the amount of LPAs in the small intestine over mice fed normal low-fat mouse chow (4 percent fat).

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Contact: Rachel Champeau
rchampeau@mednet.ucla.edu
310-794-2270
University of California - Los Angeles Health Sciences
Source:Eurekalert

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