Schistosoma mansoni P-glycoprotein levels increase in response to praziquantel exposure and correlate with reduced praziquantel susceptibility

Shanta M. Messerli, Ravi S. Kasinathan, William Morgan, Stefani Spranger, Robert M. Greenberg

Research output: Contribution to journalArticle

56 Scopus citations

Abstract

One potential physiological target for new antischistosomals is the parasite's system for excretion of wastes and xenobiotics. P-glycoprotein (Pgp), a member of the ATP-binding-cassette superfamily of proteins, is an ATP-dependent efflux pump involved in transport of toxins and xenobiotics from cells. In vertebrates, increased expression of Pgp is associated with multidrug resistance in tumor cells. Pgp may also play a role in drug resistance in helminths. In this report, we examine the relationship between praziquantel (PZQ), the current drug of choice against schistosomiasis, and Pgp expression in Schistosoma mansoni. We show that levels of RNA for SMDR2, a Pgp homolog from S. mansoni, increase transiently in adult male worms following exposure to sub-lethal concentrations (100-500 nM) of PZQ. A corresponding, though delayed, increase in anti-Pgp immunoreactive protein expression occurs in adult males following exposure to PZQ. The level of anti-Pgp immunoreactivity in particular regions of adult worms also increases in response to PZQ. Adult worms from an Egyptian S. mansoni isolate with reduced sensitivity to PZQ express increased levels of SMDR2 RNA and anti-Pgp-immunoreactive protein, perhaps indicating a role for multidrug resistance proteins in development or maintenance of PZQ resistance.

Original languageEnglish (US)
Pages (from-to)54-59
Number of pages6
JournalMolecular and Biochemical Parasitology
Volume167
Issue number1
DOIs
StatePublished - Sep 2009

Keywords

  • ABC transporter
  • Multidrug resistance
  • P-glycoprotein
  • Praziquantel
  • Schistosoma mansoni

ASJC Scopus subject areas

  • Parasitology
  • Molecular Biology

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