July 22, 2013 11:04:59 am
Australian researchers have said that a new drug that stops the malaria parasite from using vitamin B1 to multiply is now plausible.
Pharmacologist Kevin Saliba of Australian National University along with his team have reported their findings in recent issue of Nature Communications,the Australian Broadcasting Corporation reported.
Just like humans,malaria parasites need vitamins to grow and multiply. Thiamine (vitamin B1) is converted in cells to a cofactor,which then binds a number of enzymes involved in energy production.
Saliba and colleagues worked on if it might be possible to inhibit this thiamine metabolism pathway.
“We can target the pathways by which the parasite takes up the vitamin and metabolises it. These pathways can serve as drug targets,” Saliba said.
As a ‘probe drug’,they used an analogue of thiamine,which looks similar to the vitamin but cannot actually be used in energy production.
To provide proof of principle they looked at what happens to the pathway involving two enzymes oxoglutarate dehydrogenase and pyruvate dehydrogenase.
In an invitro experiment,the researchers found that the parasite metabolised the analogue into a cofactor which binds to the enzymes,but they found evidence that the analogue was inhibiting one of the enzymes.
Saliba and the team also gave the thiamine analogue to mice infected with malaria and found they lost weight.
“That’s consistent with the drug having some toxicity,” said Saliba.
The thiamine analogue used here would interfere with energy metabolism in humans so any anti-malarial drug based on these findings would have to be designed very carefully,he added.
“The idea is that you come up with a drug that would selectively target the parasite pathway. We would have to rely on slight differences between the human and parasite thiamine metabolism pathways,” said Saliba.
There are currently anti-malarial drugs that target folate metabolism,which means there is a precedent for having a drug that targets a metabolic pathway in a pathogen that also exists in humans.
A major problem with anti-malarials is the development of resistance.
“The malaria parasite has become resistant to just about all the drugs we’ve used against it,” Saliba said.
He said it is exciting to have one drug that is metabolised in the parasite that targets multiple enzymes in energy metabolism.
“It will be more difficult for the parasites to become resistant to a drug that’s binding to several enzymes,” said Saliba.
According to the World Health Organisation,about 3.3 billion people – almost half of the world’s population are at risk of malaria.
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