Alveolar echinococcosis: characterization of diagnostic antigen Em18 and serological evaluation of recombinant Em18.

Sako, Yasuhito; Nakao, Minoru; Nakaya, Kazuhiro; Yamasaki, Hiroshi; Gottstein, Bruno; Lightowers, Marshall W; Schantz, Peter M; Ito, Akira (2002). Alveolar echinococcosis: characterization of diagnostic antigen Em18 and serological evaluation of recombinant Em18. Journal of clinical microbiology, 40(8), pp. 2760-2765. American Society for Microbiology

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The Echinococcus multilocularis protein Em18 is one of the most promising antigens for use in serodiagnosis of alveolar echinococcosis in human patients. Here we identify an antigenic relationship between Em18 and a 65-kDa immunodominant E. multilocularis surface protein previously identified as either EM10 or EmII/3. The NH(2)-terminal sequence of native Em18 was determined, revealing it to be a fragment of EM10. Experiments were undertaken to investigate the effect of proteinase inhibitors on the degradation of EM10 in crude extracts of E. multilocularis protoscoleces. Em18 was found to be the product of degradation of EM10 by cysteine proteinase. A recombinant Em18 (RecEm18, derived from (349)K to (508)K of EM10) was successfully expressed by using Escherichia coli expression system and then evaluated for use in serodiagnosis of alveolar echinococcosis. RecEm18 was recognized by 27 (87.1%) and 28 (90.3%) of 31 serum samples from clinically and/or pathologically confirmed alveolar echinococcosis patients by enzyme-linked immunosorbent assay and immunoblotting, respectively. Of 33 serum samples from cystic echinococcosis patients, 1 was recorded as having a weak positive reaction to RecEm18; however, none of the serum samples which were tested from neurocysticercosis patients (n = 10) or healthy people (n = 15) showed positive reactions. RecEm18 has the potential for use in the differential serodiagnosis of alveolar echinococcosis.

Item Type:	Journal Article (Original Article)
Division/Institute:	05 Veterinary Medicine > Department of Infectious Diseases and Pathobiology (DIP) > Institute of Parasitology
UniBE Contributor:	Gottstein, Bruno
Subjects:	600 Technology > 610 Medicine & health 600 Technology > 630 Agriculture
ISSN:	0095-1137
Publisher:	American Society for Microbiology
Language:	English
Submitter:	Bruno Gottstein
Date Deposited:	23 Jul 2018 09:28
Last Modified:	05 Dec 2022 15:16
PubMed ID:	12149326
URI:	https://boris.unibe.ch/id/eprint/118823