Biomedical Science Letters (대한의생명과학회지)

The Korean Society for Biomedical Laboratory Sciences (대한의생명과학회)
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Protective Effects of a Monoclonal Antibody to a Mannose-Binding Protein of Acanthamoeba culbertsoni

  • Park, A-Young (Department of Biomedical Laboratory Science, Molecular Diagnosis Research Institute, Namseoul University) ;
  • Kang, A-Young (Department of Biomedical Laboratory Science, Molecular Diagnosis Research Institute, Namseoul University) ;
  • Jung, Suk-Yul (Department of Biomedical Laboratory Science, Molecular Diagnosis Research Institute, Namseoul University)
  • Received : 2018.11.01
  • Accepted : 2018.12.06
  • Published : 2018.12.31
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Abstract

Acanthamoeba culbertsoni is the causative agent of granulomatous amoebic encephalitis (GAE), a condition that predominantly occurs in immunocompromised individuals and which is typically fatal. A mannose-binding protein (MBP) among lectins was shown to have strong A. castellanii pathogenic potential when correlated with major virulence proteins. In this study, protective effects were analyzed using the monoclonal antibody to A. culbertsoni MBP by quantification and were also compared with other free-living amoebae. For the amoebial cytotoxicity to the target cell, amoeba trophozoites were incubated with Chinese hamster ovary (CHO) cells. For the protective effects of antibodies, amoebae were pre-incubated with them for 4 h and then added to the target cells. After 24 h, the supernatants were collected and examined for host cell cytotoxicity by measuring lactate dehydrogenase (LDH) release. The cytotoxicity of A. culbertsoni to the CHO cells showed about 87.4%. When the monoclonal antibody was pre-incubated with A. culbertsoni, the amoebial cytotoxicity was remarkably decreased as shown at LDH release (1.858 absorbance), which was represented with about 49.9%. Taken together, it suggested that the monoclonal antibody against MBP be important to inhibit the cytotoxicity of A. culbertsoni trophozoites to the target cell. The antibody will be applied into an in vivo functional analysis, which would help to develop therapeutics.

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References

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