Identification of the haemoglobin scavenger receptor

Mette Kristiansen, Jonas Heilskov Graversen, Christian Jacobsen, Ole Sonne, Hans-Jürgen Hoffman, S K Alex Law, Søren K Moestrup

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Intravascular haemolysis is a physiological phenomenon as well as a severe pathological complication when accelerated in various autoimmune, infectious (such as malaria) and inherited (such as sickle cell disease) disorders. Haemoglobin released into plasma is captured by the acute phase protein haptoglobin, which is depleted from plasma during elevated haemolysis. Here we report the identification of the acute phase-regulated and signal-inducing macrophage protein, CD163, as a receptor that scavenges haemoglobin by mediating endocytosis of haptoglobin-haemoglobin complexes. CD163 binds only haptoglobin and haemoglobin in complex, which indicates the exposure of a receptor-binding neoepitope. The receptor-ligand interaction is Ca2+-dependent and of high affinity. Complexes of haemoglobin and multimeric haptoglobin (the 2-2 phenotype) exhibit higher functional affinity for CD 163 than do complexes of haemoglobin and dimeric haptoglobin (the 1-1 phenotype). Specific CD163-mediated endocytosis of haptoglobin-haemoglobin complexes is measurable in cells transfected with CD163 complementary DNA and in CD163-expressing myelo-monocytic lymphoma cells.

Original languageEnglish
JournalNature
Volume409
Pages (from-to)198-201
ISSN0028-0836
DOIs
Publication statusPublished - 11. Jan 2001
Externally publishedYes

Keywords

  • Animals
  • Antigens, CD
  • Antigens, Differentiation, Myelomonocytic
  • CHO Cells
  • Cricetinae
  • Endocytosis
  • Erythrocytes
  • Haptoglobins
  • Heme Oxygenase (Decyclizing)
  • Hemoglobins
  • Humans
  • Macrophages
  • Molecular Sequence Data
  • Receptors, Cell Surface
  • Transfection

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