Volume 80, Issue 6
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645


Neurocysticercosis, an endemic parasitic disease in most developing countries, is caused by and compromises the human central nervous system. Cathepsin L-like proteases are secreted by several parasites including and constitute important antigens for immunodiagnostics. A protein fraction with cathepsin L-like activity was purified from the cysticercus fluid by size exclusion and ion exchange chromatography. Cathepsin L-like activity was measured fluorometrically by detecting the hydrolysis of the fluorogenic substrate Z-Phe-Arg-AMC. The purified protein fraction included antigens of 53 and 25 kD that were tested in a Western immunoblot and in an enzyme-linked immunosorbent assay (ELISA) for detection of human cysticercosis. The sensitivity of the Western immunoblot was 96% for patients infected with multiple cysts and 78% for patients with a single cyst. Specificity was 98%. The sensitivity of the ELISA was 98% in patients with multiple cysts and 84% in patients with a single cyst. Specificity was 92.7%.


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  • Received : 02 Oct 2008
  • Accepted : 06 Mar 2009

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