The IgG specific endoglycosidase EndoS inhibits both cellular and complement mediated autoimmune hemolysis.
Author
Summary, in English
EndoS from Streptococcus pyogenes is an immunomodulating enzyme that specifically hydrolyzes glycans from human IgG and thereby affects antibody effector functions. Autoimmune hemolytic anemia is caused by antibody mediated red blood cell (RBC) destruction and often resists treatment with corticosteroids that also cause frequent adverse effects. We show here that anti-RhD (anti-D) and rabbit anti-human-RBC antibodies (anti-RBC) mediated destruction of RBC, i.e. phagocytosis, complement activation and hemolysis in vitro and in vivo was inhibited by EndoS. Phagocytosis by monocytes in vitro was inhibited by pre-treatment of anti-D with EndoS before sensitization of RBC, and abrogated by direct addition of EndoS to blood containing sensitized RBC. The toxic effects of monocytes stimulated with anti-D-sensitized RBC, as measured by interleukin-8 secretion and oxygen metabolite production, was restrained by EndoS. Agglutination of RBC and complement mediated hemolysis in vitro in whole human blood caused by rabbit anti-RBC was inhibited by EndoS. Development of anemia in mice caused by a murine anti-RBC IgG2a monoclonal autoantibody, and complement activation and erythrophagocytosis by Kupffer cells in the liver, were reduced by EndoS. Our data indicate that EndoS is a potential therapeutic agent that might be evaluated as an alternative to current treatment regimens against antibody mediated destruction of RBC.
Department/s
Publishing year
2010
Language
English
Pages
5080-5088
Publication/Series
Blood
Volume
115
Issue
24
Links
Document type
Journal article
Publisher
American Society of Hematology
Topic
- Hematology
Status
Published
Research group
- Infection and immunomodulation
- Transfusion Medicine
ISBN/ISSN/Other
- ISSN: 1528-0020