First human antibodies to fight all Ebola viruses found


First human antibodies to fight all Ebola viruses found
  1. First human antibodies to fight all Ebola viruses found
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    There are no vaccines or treatments approved for treating these viruses. The post First human antibodies to fight all Ebola viruses found appeared first on The Financial …
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The first natural human antibodies that can neutralise and protect animals against all three major disease-causing Ebola viruses have been discovered by scientists, including one of Indian origin.(Reuters)

The first natural human antibodies that can neutralise and protect animals against all three major disease-causing Ebola viruses have been discovered by scientists, including one of Indian origin. The findings, published in the journal Cell, could lead to the first broadly effective Ebola virus therapies and vaccines. Ebola infections are usually severe, and often fatal. There are no vaccines or treatments approved for treating these viruses. Monoclonal antibodies, which bind to and neutralise specific pathogens and toxins, have emerged as one of the most promising treatments for Ebola patients.

A critical problem, however, is that most antibody therapies target just one specific Ebola virus. “It would be ideal to develop a single therapy that could treat or prevent infection caused by any known Ebola virus,” said study co-leader Zachary A Bornholdt, director of antibody discovery at Mapp Biopharmaceutical company in the US. “Our discovery and characterisation of broadly neutralising human antibodies is an important step towards that goal,” said study co-leader, Kartik Chandran, professor at Albert Einstein College of Medicine. In earlier research, the team isolated 349 distinct monoclonal antibodies from a survivor of the 2013-16 Western African Ebola epidemic.

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In the current study, the researchers found that two of those 349 antibodies, known as ADI-15878 and ADI-15742, potently neutralised infection by all five known Ebola viruses in tissue culture. Both antibodies were able to protect animals (mice and ferrets) that had been exposed to a lethal dose of the three major agents: Ebola virus, Bundibugyo virus and Sudan virus. Follow-up studies showed that the two antibodies isolated from the Ebola patient work by interfering with a critical step in the process by which ebolaviruses infect cells and then multiply inside them. The two antibodies encounter the virus while it is still in the bloodstream, and bind to glycoproteins (proteins to which carbohydrate chains are attached) that project from its surface.

The virus, with its hitchhiking antibodies still bound to it, then attaches to a cell and enters the lysosome – a membrane-bound structure within the cell that is filled with enzymes for digesting foreign and cellular components. The virus must then fuse with the lysosome membrane to escape into the host cell’s…

human antibodies, neutralise, protect animals, disease-causing viruses, Ebola, scientists
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