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Role of mannan-binding protein, MBP, in innate immunity

Tomoaki Nakagawa1, Bruce Yong Ma, Kazuhide Uemura

  • 1Department of Biological Chemistry, Graduate School of Pharmaceutical Sciences, Kyoto University, Kyoto 606-8501, Japan.

Anticancer Research
|December 12, 2003
PubMed

Insights

Mannan-binding protein (MBP) exhibits anti-tumor effects through a novel mechanism called mannan-binding protein-dependent cell-mediated cytotoxicity (MDCC). This process involves immune cells and does not require complement activation, suggesting a new therapeutic avenue.

Area of Science:

  • Immunology
  • Molecular Biology
  • Cancer Research

Background:

  • Mannan-binding protein (MBP) is a C-type lectin involved in innate immunity by activating the complement system.
  • MBP binds to carbohydrate structures on microorganisms, facilitating their clearance.
  • MBP also interacts with mammalian cells expressing specific ligands.

Purpose of the Study:

  • To investigate the potential anti-tumor activity of MBP.
  • To characterize the mechanism of MBP-mediated tumor cell killing.
  • To explore the role of MBP in host defense within the small intestine.

Main Methods:

  • In vivo studies using tumor cells transplanted into nude mice.
  • Observation and characterization of MBP's effect on tumor growth.
  • Analysis of the mechanism, distinguishing it from complement-dependent pathways.

Main Results:

  • MBP demonstrated significant anti-tumor activity in vivo.
  • A novel cytotoxic mechanism, termed mannan-binding protein-dependent cell-mediated cytotoxicity (MDCC), was identified.
  • MDCC does not rely on complement activation and involves immune cells.
  • MBP is selectively expressed in small intestine epithelial cells, suggesting a role in host defense.

Conclusions:

  • MBP possesses inherent anti-tumor properties mediated by a novel cytotoxic pathway (MDCC).
  • MDCC represents a complement-independent mechanism involving immune cells, offering potential for cancer therapy.
  • The selective expression of MBP in the small intestine highlights its importance as a host defense factor in this organ.

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