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Quest for edible malarial vaccine leads to other potential medical uses for algae
Date:4/19/2013

fessor of biology at UC San Diego who headed the study. "So what this study shows is that you can get a really good immune response from a recombinant protein in algae that you feed to a mammal. In this case, it happens to be a mouse, but presumably it would also work in a human. That's really encouraging for the potential for algae-based vaccines in the future."

The scientists say bacterial infections caused by Salmonella, E. coli and other food and water-borne pathogens could be prevented in the future with inexpensive vaccines developed from algae that could be eaten rather than injected. "It might even be used to protect against cholera itself," said James Gregory, a postdoctoral researcher in Mayfield's lab and the first author of the paper. In his experiments with mice, he said, Immunoglobulin G (IgG) antibodieswhich are found in blood and tissueswere produced against the cholera toxin, "but not the malaria antigen and we don't quite understand why."

Part of the difficulty in creating a vaccine against malaria is that it requires a system that can produce structurally complex proteins that resemble those made by the parasite, thus eliciting antibodies that disrupt malaria transmission. Most vaccines created by engineered bacteria are relatively simple proteins that stimulate the body's immune system to produce antibodies against bacterial invaders.

Three years ago, a UC San Diego team of biologists headed by Mayfield, who is also the director of the San Diego Center for Algae Biotechnology, a research consortium seeking to develop transportation fuels from algae, published a landmark study demonstrating that many complex human therapeutic proteins, such as monoclonal antibodies and growth hormones, could be produced by the common algae Chlamydomonas. That got Gregory wondering if complex malarial transmission blocking vaccine candidates could also be produced by Chlamydomonas. Two billion people live in malaria endemic
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Contact: Kim McDonald
kmcdonald@ucsd.edu
858-534-7572
University of California - San Diego
Source:Eurekalert

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