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Cryptosporidium parvum: identification and characterization of an acid phosphatase

María Magdalena Aguirre-García1, Pablo C Okhuysen

  • 1Department of Experimental Medicine, School of Medicine, UNAM, Dr. Balmis 148, Colonia Doctores, Mexico City, DF 06726, México. maguirre@servidor.unam.mx

Parasitology Research
|January 26, 2007
PubMed

Insights

This study demonstrates acid phosphatase activity in Cryptosporidium parvum oocysts, identifying it as a potential virulence factor. This enzyme

Area of Science:

  • Biochemistry
  • Parasitology
  • Enzymology

Background:

  • Acid phosphatases are recognized virulence factors in pathogens.
  • These enzymes can suppress the human neutrophil respiratory burst.
  • Enzyme studies in Cryptosporidium parvum remain limited.

Purpose of the Study:

  • To investigate the presence and characteristics of acid phosphatase activity in Cryptosporidium parvum oocysts.
  • To determine the enzymatic nature of the identified acid phosphatase.
  • To explore its potential role as a virulence factor.

Main Methods:

  • Characterization of enzymatic activity in C. parvum oocyst membrane fractions.
  • Testing the effects of specific protein tyrosine and serine/threonine phosphatase inhibitors.
  • Immunological cross-reactivity using antibodies against human placental PTPase 1B.

Main Results:

  • A membrane-bound acid phosphatase activity was detected in C. parvum oocysts.
  • The activity was inhibited by protein tyrosine phosphatase inhibitors (sodium orthovanadate, ammonium molybdate, sodium tungstate).
  • No inhibition was observed with protein serine/threonine phosphatase inhibitors (okadaic acid, calyculin).
  • Antibodies cross-reacted with 30 and 31 kDa molecules in the oocyst membrane.

Conclusions:

  • This is the first report of acid phosphatase activity in Cryptosporidium.
  • The enzyme exhibits characteristics of a protein tyrosine phosphatase.
  • The findings suggest a potential role for this enzyme in C. parvum pathogenesis.

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