Journal
BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS
Volume 363, Issue 4, Pages 915-920Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.bbrc.2007.09.023
Keywords
echinococcus multilocularis; alveolar echinococcosis; EMY162; vaccine; EM95; host protective antigen
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Alveolar echinococcosis is caused by infection with the larval stage of Echinococcus multilocularis. We recently identified a cDNA clone, designated as emy162, that encodes a putative secreted protein. EMY162 shares structural features with the EM95 antigen, which is a host-protective antigen. The amino acid sequence of EMY 162 shows 31.4% identity to EM95 whereas these antigens are distinguishable with respect to their predicted secondary structure and antigenicity on Western blot analysis. RT-PCR analysis revealed that the gene expression of emy162 was significantly higher than that of em95 at each life-cycle stage. Recombinant EMY162 antigen induced a significant level of host-protection (74.3%) in experimental infection with E. multilocularis eggs in mice. Notably, recombinant EMY162 antigen showed significant reactivity to the sera from alveolar echinococcosis patients. These results may help in the development of a practical vaccine to reduce the level of alveolar echinococcosis in humans. (C) 2007 Elsevier Inc. All rights reserved.
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