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Nigeria: Chemical Substance Blocks Mosquitoes' Ability to 'Smell' Humans
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Vanguard (Lagos)
25 March 2008
Posted to the web 25 March 2008
Lagos
DEET, a substance widely used in mosquito repellants, blocks the ability of mosquitoes and other insects to smell humans - a finding that could help curb the spread of malaria by contributing to the development of more effective repellants - according to a study published in the journal Science.
DEET has been used in mosquito repellants for more than 50 years, but until recently, it has been unclear why it prevents mosquitoes from biting humans, according to Business Day. In addition, DEET is not safe for infants and young children - one of the populations most vulnerable to malaria. A molecular neurobiologist from Rockefeller University, and colleagues found that DEET blocks insects' smell mechanism by hindering key odor receptors that rely on a protein called OR83b. By hindering mosquitoes' smell mechanism, DEET masks odors that ordinarily alert mosquitoes to a human presence. The only way we can improve on existing technology is to understand how it works. Everyone knows DEET is useful, but until now, there has never been a satisfactory explanation of how it works.
Insect repellants are an important part of malaria control efforts but that new products are needed. The telephone and television have evolved since the 1950s, but insecticides haven't. The finding could lead to the development of improved mosquito repellants.
Now similar tricks can be applied in the pharmaceutical industry uses to screen millions and millions of molecules to find ones that block OR83b better than DEET.
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