Abstract:
BACKGROUND:Schistosomiasis--infection with helminth parasites in the genus Schistosoma, including S. mansoni--is a widespread, devastating tropical disease affecting more than 200 million people. No vaccine is available, and praziquantel, the only drug extensively utilized, is currently administered more than 100 million people yearly. Because praziquantel resistance may develop it is essential to identify novel drug targets. Our goal was to investigate the potential of a unique, selenium-containing parasite enzyme thioredoxin glutathione reductase (TGR) as a drug target. METHODS AND FINDINGS:Using RNA interference we found that TGR is essential for parasite survival; after silencing of TGR expression, in vitro parasites died within 4 d. We also found that auranofin is an efficient inhibitor of pure TGR (Ki = 10 nM), able to kill parasites rapidly in culture at physiological concentrations (5 microM), and able to partially cure infected mice (worm burden reductions of ~60%). Furthermore, two previously used antischistosomal compounds inhibited TGR activity, suggesting that TGR is a key target during therapy with those compounds. CONCLUSIONS:Collectively, our results indicate that parasite TGR meets all the major criteria to be a key target for antischistosomal chemotherapy. To our knowledge this is the first validation of a Schistosoma drug target using a convergence of both genetic and biochemical approaches.
journal_name
PLoS Medjournal_title
PLoS medicineauthors
Kuntz AN,Davioud-Charvet E,Sayed AA,Califf LL,Dessolin J,Arnér ES,Williams DLdoi
10.1371/journal.pmed.0040206subject
Has Abstractpub_date
2007-06-01 00:00:00pages
e206issue
6eissn
1549-1277issn
1549-1676pii
06-PLME-RA-0587journal_volume
4pub_type
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