Immune Netw.  2018 Feb;18(1):e11. 10.4110/in.2018.18.e11.

Beyond the Role of CD55 as a Complement Component

Affiliations
  • 1Radioisotope Research Division, Department of Research Reactor Utilization, Korea Atomic Energy Research Institute, Daejeon 34057, Korea.
  • 2Severance Biomedical Science Institute and BK21 PLUS Project to Medical Sciences, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul 06230, Korea. lkkim@yuhs.ac

Abstract

The complement is a part of the immune system that plays several roles in removing pathogens. Despite the importance of the complement system, the exact role of each component has been overlooked because the complement system was thought to be a nonspecific humoral immune mechanism that worked against pathogens. Decay-accelerating factor (DAF or CD55) is a known inhibitor of the complement system and has recently attracted substantial attention due to its role in various diseases, such as cancer, protein-losing enteropathy, and malaria. Some protein-losing enteropathy cases are caused by CD55 deficiency, which leads to complement hyperactivation, malabsorption, and angiopathic thrombosis. In addition, CD55 has been reported to be an essential host receptor for infection by the malaria parasite. Moreover, CD55 is a ligand of the seven-span transmembrane receptor CD97. Since CD55 is present in various cells, the functional role of CD55 has been expanded by showing that CD55 is associated with a variety of diseases, including cancer, malaria, protein-losing enteropathy, paroxysmal nocturnal hemoglobinuria, and autoimmune diseases. This review summarizes the current understanding of CD55 and the role of CD55 in these diseases. It also provides insight into the development of novel drugs for the diagnosis and treatment of diseases associated with CD55.

Keyword

CD55; Complement; Cancer; Malaria; Immunotherapy

MeSH Terms

Antigens, CD55
Autoimmune Diseases
Complement System Proteins*
Diagnosis
Hemoglobinuria, Paroxysmal
Immune System
Immunotherapy
Malaria
Parasites
Protein-Losing Enteropathies
Thrombosis
Antigens, CD55
Complement System Proteins

Figure

  • Figure 1. Simplified complement system.

  • Figure 2. The role of CD55 in various diseases. CD55 acts as a positive (blue arrows) or negative (purple lines) regulator in disease.


Reference

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