a small molecule inhibitor of signal peptide peptidase inhibits plasmodium development in the liver and decreases malaria severity信号肽肽酶的小分子抑制剂抑制疟原虫发展在肝脏,减少疟疾严重程度.pdfVIP
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a small molecule inhibitor of signal peptide peptidase inhibits plasmodium development in the liver and decreases malaria severity信号肽肽酶的小分子抑制剂抑制疟原虫发展在肝脏,减少疟疾严重程度
A Small Molecule Inhibitor of Signal Peptide Peptidase
Inhibits Plasmodium Development in the Liver and
Decreases Malaria Severity
1¤ 1 2 2 ˆ 1,3
Iana Parvanova , Sabrina Epiphanio , Abdul Fauq , Todd E. Golde , Miguel Prudencio , Maria M.
Mota1,3*
´
1 Unidade de Malaria, Instituto de Medicina Molecular, Faculdade de Medicina da Universidade de Lisboa, Lisboa, Portugal, 2 Department of Neuroscience, Mayo Clinic,
ˆ
College of Medicine, Jacksonville, Florida, United States of America, 3 Instituto Gulbenkian de Ciencia, Oeiras, Portugal
Abstract
The liver stage of Plasmodium’s life cycle is the first, obligatory step in malaria infection. Decreasing the hepatic burden of
Plasmodium infection decreases the severity of disease and constitutes a promising strategy for malaria prophylaxis. The
efficacy of the gamma-secretase and signal peptide peptidase inhibitor LY411,575 in targeting Plasmodium liver stages was
evaluated both in human hepatoma cell lines and in mouse primary hepatocytes. LY411,575 was found to prevent
Plasmodium’s normal development in the liver, with an IC50 of approximately 80 nM, without affecting hepatocyte invasion
by the parasite. In vivo results with a rodent model of malaria showed that LY411,575 decreases the parasite load in the liver
and increases by 55% the resistance of mice to cerebral malaria, one of the most severe malaria-associated syndromes. Our
data show that LY411,575 does not exert its effect via the Notch signaling pathway suggesting that it may interfere with
Plasmodium development throu
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