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Journal of Clinical Microbiology, June 2003, p. 2577-2586, Vol. 41, No. 6
0095-1137/03/$08.00+0     DOI: 10.1128/JCM.41.6.2577-2586.2003

Characterization of the 8-Kilodalton Antigens of Taenia solium Metacestodes and Evaluation of Their Use in an Enzyme-Linked Immunosorbent Assay for Serodiagnosis

Kathy Hancock,* Azra Khan, Fatima B. Williams, Melinda L. Yushak, Sowmya Pattabhi, John Noh, and Victor C. W. Tsang

Division of Parasitic Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia 30341

Received 11 December 2002/ Returned for modification 23 January 2003/ Accepted 3 February 2003

The Western blot for cysticercosis, which uses lentil lectin purified glycoprotein (LLGP) antigens extracted from the metacestode of Taenia solium, has been the "gold standard" serodiagnostic assay since it was first described in 1989. We report that the diagnostic antigens at 14, 18, and 21 kDa, as well as some larger disulfide-bonded antigens, are actually all members of a very closely related family of proteins, the 8-kDa antigens. The genes for 18 unique, mature proteins have been identified. Nine of these were chemically synthesized and tested in an enzyme-linked immunosorbent assay with a battery of defined serum samples, including 32 cysticercosis-positive serum samples reactive with the 8-kDa antigens of LLGP on Western blotting, 34 serum samples from patients with other parasitic infections, and 15 normal human serum samples. One of the 8-kDa antigens, TsRS1, is 100% sensitive and 100% specific. TsRS1 will be one component of a cocktail of three to four synthetic or recombinant antigens, based on the diagnostic bands of the Western blot, which will be used for the serodiagnosis of cysticercosis.

* Corresponding author. Mailing address: Division of Parasitic Diseases, Centers for Disease Control and Prevention, Bldg. 23, Room 1001, Mail Stop F-13, 4770 Buford Highway, Atlanta, GA 30341. Phone: (770) 488-4533. Fax: (770) 488-4109. E-mail: khancock{at}cdc.gov.

Journal of Clinical Microbiology, June 2003, p. 2577-2586, Vol. 41, No. 6
0095-1137/03/$08.00+0     DOI: 10.1128/JCM.41.6.2577-2586.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



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