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Ifosfamide metabolites CAA, 4-OH-Ifo and Ifo-mustard reduce apical phosphate transport by changing NaPi-IIa in OK

L Patzer1, N Hernando, U Ziegler

  • 1Department of Pediatrics, Friedrich-Schiller-University, Jena, Germany. l.patzer@krankenhaus-halle-saale.de

Kidney International
|September 28, 2006
PubMed

Insights

Ifosfamide metabolites like chloroacetaldehyde and Ifosfamide-mustard impair kidney phosphate transport by affecting the NaPi-IIa transporter. These findings shed light on Ifosfamide-induced nephropathy mechanisms.

Area of Science:

  • Nephrology
  • Toxicology
  • Molecular Biology

Background:

  • Ifosfamide (Ifo) chemotherapy can cause Fanconi syndrome and renal phosphate reabsorption impairment in children.
  • The exact mechanisms behind Ifo-induced nephropathy are not fully understood.

Purpose of the Study:

  • To investigate the impact of Ifosfamide metabolites on the type IIa sodium-dependent phosphate transporter (NaPi-IIa).
  • To explore the role of Ifosfamide-mustard in the pathogenesis of Ifo-induced nephropathy.

Main Methods:

  • Using viable opossum kidney cells to assess NaPi-IIa-mediated phosphate transport.
  • Evaluating the effects of Ifosfamide, chloroacetaldehyde (CAA), 4-hydroperoxyIfosfamide (4-OH-Ifo), Ifosfamide-mustard, and Cyclophosphamide-mustard on cell viability, phosphate transport, and NaPi-IIa expression.
  • Investigating the protective role of sodium-2-mercaptoethanesulfonate (MESNA).

Main Results:

  • CAA, 4-OH-Ifo, Ifosfamide-mustard, and Cyclophosphamide-mustard significantly reduced phosphate transport and NaPi-IIa expression in kidney cells.
  • Ifosfamide-mustard induced NaPi-IIa internalization and reduced its de novo synthesis.
  • MESNA partially protected against CAA but not 4-OH-Ifo or Ifosfamide-mustard effects.

Conclusions:

  • Ifosfamide metabolites, particularly Ifosfamide-mustard, play a significant role in Ifosfamide-induced nephropathy by inhibiting phosphate transport.
  • The mechanism involves direct effects on the NaPi-IIa transporter, including internalization and reduced synthesis.

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