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New discovery could dramatically reduce leishmaniasis treatment doses and side effects
Date:11/5/2013

The Amphotericin B (AmB) is the main active ingredient in the most effective drug used to treat leishmaniasis, a disease which in the Western world mainly affects dogs, but in developing countries affects over 12 million people, with more than 70,000 deaths per year. The cost of treating humans with AmB surpasses $5,000 per patient, the treatment is extensive (2-hour sessions every day during 21 days), and the side effects are frequent and many times patients must be hospitalised.

Researchers from the University of Miami, Florida and the Universitat Autnoma de Barcelona have developed a method which allows to drastically reduce the drug dose, since it improves its efficacy 83%, multiplies by 10 the capacity of the drug to attack cell infected by the parasite which provokes the disease, and significantly reduces the toxicity of the parasite. The method has been successfully tested on mice models of leishmaniasis.

The complex compound acts through the action of the PDD nanoparticle, a substance measuring some 10 nanometres in diameter which is fit into the active principle, Amphotericin B, and guides it selectively to the cells harbouring the parasite. Scientists observed how, while the usual complete dose of the drug requires over 12 days to reduce the skin lesions caused by the disease, one dose of the complex compound with only 17% of the complete dose of the drug improves skin lesions in two or three days. Moreover, the complex compound acts as a therapeutic vaccine which activates the immune system against the reservoir cells hosting the parasite.

The PDD substance has been used in previous trials with people with the aim of improving the response of their immune system to other diseases. Now there is a need for clinical trials with humans in order to verify its safety as an adjuvant in the treatment of leishmaniasis. If its safety in humans is confirmed, it will also reduce the cost of the treatment drastically, and this is a k
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Contact: Jordi Alberola
jordi.alberola@uab.cat
34-935-811-532
Universitat Autonoma de Barcelona
Source:Eurekalert

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