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Research advances therapy to protect against dengue virus
Date:4/8/2013

CAMBRIDGE, MA -- Nearly half of the world's population is at risk of infection by the dengue virus, yet there is no specific treatment for the disease. Now a therapy to protect people from the virus could finally be a step closer, thanks to a team at MIT.

In a paper published today in the Proceedings of the National Academy of Sciences, the researchers, from MIT's Koch Institute of Integrative Cancer Research, present a novel approach to developing a dengue therapy using mutated antibodies.

According to a study by the International Research Consortium on Dengue Risk Assessment, Management and Surveillance, up to 390 million people are infected with the dengue virus each year. For most people the mosquito-borne virus causes flulike symptoms, including fever, headache and joint pain. But for some, particularly children, the virus can develop into the far more serious dengue hemorrhagic fever, causing severe blood loss and even death.

Despite the threat posed by the disease, developing a vaccine against dengue has so far proved challenging, according to Ram Sasisekharan, the Alfred H. Caspary Professor of Biological Engineering at MIT. That's because dengue is not one virus but four different viruses, or serotypes, each of which must be neutralized by the vaccine.

Protecting people from only one or some of the four viruses could cause them to develop the more severe form of dengue if they later become infected with one of the other serotypes, in a process known as antibody-dependent enhancement, Sasisekharan says. "That was the motivation for carrying out our study, to generate a fully neutralizing antibody that works for all four serotypes."

Pushing the envelope

Efforts to develop a therapeutic antibody for dengue are focused on a part of the virus called the envelope protein. "This is a very critical protein that allows the virus to latch on to the appropriate receptor within the host, to infect
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Contact: Sarah McDonnell
s_mcd@mit.edu
617-253-8923
Massachusetts Institute of Technology
Source:Eurekalert

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