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Development of monoclonal antibody-based galactomannoprotein antigen-capture ELISAs to detect Aspergillus fumigatus infection in the invasive aspergillosis rabbit models

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Abstract

Aspergillus fumigatus is one of the most prominent opportunistic fungal pathogens in immunocompromised hosts. Early recognition of this infection along with prompt antifungal therapy may increase the survival rate. We expressed two potential bio-markers of A. fumigatus infection—galactomannoprotein Afmp1p and Afmp4p in Pichia pastoris. We generated 33 monoclonal antibodies (MAbs), 20 against recombinant Afmp1p (rAfmp1p) and the other 13 against recombinant Afmp4p (rAfmp4p). Subsequently, we developed two antigen-capture enzyme-linked immunosorbent assays (ELISAs) which employed MAbs as both the capture and the detection antibodies for rAfmp1p and rAfmp4p. The two antigen-capture ELISAs specifically detected Afmp1p/Afmp4p in cultures of A. fumigatus and had no cross-reaction with other tested pathogenic fungi, including Penicillium marneffei and other pathogenic Aspergillus species. The Afmp1p-captured ELISA would be positive even when the culture supernatant of A. fumigatus had been diluted to 128-fold of its original concentration. The two antigen ELISAs could capture circulating or excreted antigens during the acute phase of invasive aspergillosis (IA) in the animal model, and had no cross-reactivity to other Aspergillus-challenged animal models. We developed two antigen-capture ELISAs for the laboratory diagnosis of A. fumigatus infection. These two antigen-capture ELISAs may be useful in the clinical diagnosis of aspergillosis.

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Acknowledgments

This work was supported by the Research and Development Project of Guangdong Province (no. 2010B090400498).

Conflict of interest

The authors declare that they have no conflict of interest.

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Authors and Affiliations

  1. Center for Clinical Laboratory, Zhujiang Hospital, Southern Medical University, Guangzhou, 510282, People’s Republic of China

    Z.-Y. Wang, J.-P. Cai, L.-W. Qiu, W. Hao, Y.-X. Pan & X.-Y. Che

  2. Department of Microbiology, The University of Hong Kong, Hong Kong Special Administrative Region, People’s Republic of China

    E. T. K. Tung, C. C. Y. Lau, P. C. Y. Woo, S. K. P. Lau & K.-Y. Yuen

Authors
  1. Z.-Y. Wang
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  2. J.-P. Cai
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  3. L.-W. Qiu
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  4. W. Hao
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  5. Y.-X. Pan
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  6. E. T. K. Tung
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  7. C. C. Y. Lau
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  8. P. C. Y. Woo
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  9. S. K. P. Lau
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  10. K.-Y. Yuen
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  11. X.-Y. Che
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Corresponding authors

Correspondence to K.-Y. Yuen or X.-Y. Che.

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Wang, ZY., Cai, JP., Qiu, LW. et al. Development of monoclonal antibody-based galactomannoprotein antigen-capture ELISAs to detect Aspergillus fumigatus infection in the invasive aspergillosis rabbit models. Eur J Clin Microbiol Infect Dis 31, 2943–2950 (2012). https://doi.org/10.1007/s10096-012-1645-3

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  • DOI: https://doi.org/10.1007/s10096-012-1645-3

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