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Worcester Polytechnic Institute Receives NIH Grant to Study Components of a Potentially Potent and Cost-Effective Malaria Treatment
Date:7/15/2014

pal therapeutic compound in the plant, is extracted, purified, and combined with other drugs to make ACT. Weathers’s team takes a different approach, using dried whole leaves from Artemisia annua as a medication.

In previous work Weathers and her colleagues have shown that mice fed powered dried leaves had 40 times more artemisinin in their blood stream than mice fed pure artemisinin. Furthermore, the whole-plant therapy was five times more effective in clearing the disease-causing parasite from the mice. In addition to delivering more artemisinin to the bloodstream, the effectiveness of the whole plant treatment may be due to the presence of other potentially therapeutic compounds in the leaves.

In the new study, Weathers will use a laboratory model of the human digestive system to discover which compounds in the leaves move through the intestinal wall. She will focus on several compounds, including flavonoids and terpenes, which have exhibited antimalarial effects of their own and which may also help artemisinin move through the intestinal wall and into the bloodstream where it can attack the malaria parasite.

Flavonoids are widely distributed in plants and have various functions, including giving blossoms color. They are also believed to work synergistically with artemisinin to kill the malaria parasite. Terpenes are among the essential oils that play a role in the plant’s defense system. Secreted terpenes have anti-microbial properties and deter some leaf-eating predators.

In a series of experiments over the next three years, the Weathers lab will use a cell culture model to study how the flavonoids and terpenes move through a layer of cultured human intestinal wall cells. They will also test the flavonoids and terpenes in combination with artemisinin to see how they affect the movement of artemisinin across the cell layer.

“Because these other compounds in the plant have some therapeutic activity, using the whole plant be
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