The Wellcome Trust Sanger Institute at Hinxton has played a major role in discovering new vaccines against malaria.
Previously untested antigens found in a large-scale study of infected children in Kenya could save hundreds of thousands of lives a year.
Researchers have been able to measure which proteins the children’s immune systems responded to, revealing antigens that had not previously been identified as possible vaccine targets and new insights into the ways antigens could be used in combination to increase protection.
“Resistance to malaria drugs is an increasing problem so vaccines are desperately needed to battle the Plasmodium falciparum parasite before it has a chance to make people sick,” says Dr Faith Osier, first author from the Kenya Medical Research Institute. “This study presents us with a large number of new vaccine candidates that offer real hope for the future.”
A group of children infected with malaria were followed over a six-month period by scientists a the Kenya Institute. While some patients became sick, others were protected by naturally occurring antibodies that stopped the malaria parasite from penetrating their red blood cells during the blood stage of the disease, which produces severe symptoms such as fever and anaemia.
Researchers used samples taken from these children to identify combinations of antibodies that provided up to 100 per cent protection against malaria.
The study used a library of parasite proteins that was generated using an approach developed at the Wellcome Trust Sanger Institute by Dr Gavin Wright and Dr Julian Rayner. In this study, Sanger Institute scientists collaborated with colleagues in Kenya to see which of them the children’s immune systems had developed antibodies against.
“The use of these proteins by the Sanger Institute’s Malaria Programme is helping to zero in on and exploit the weakest point in the malaria parasite’s life cycle,” says Dr Julian Rayner, an author from the Sanger Institute. “Trials for vaccines in the past have focused on one target at a time and have had limited success; with this approach, we can systematically test larger numbers of targets and identify targets that might work in combination.”
“Each year, hundreds of thousands of people die from malaria; but hundreds of millions are infected, many of whom are protected from severe symptoms by their immune response,” says Dr Kevin Marsh, director of the KEMRI Wellcome Trust Research Programme at the Kenya Institute. “Collaborating with our colleagues at the Sanger Institute helps to bring the latest technological advances to the field, which in this case has highlighted combinations of naturally occurring antibodies that could contribute to the design of new vaccines.”