Cited by 267Heme Oxygenase-1 and Carbon MonoxideHemoglobin structure and functionPhagocytosis and Immune Regulation

Constitutive Endocytosis of CD163 Mediates Hemoglobin-Heme Uptake and Determines the Noninflammatory and Protective Transcriptional Response of Macrophages to Hemoglobin

Schaer, Christian A., Schoedon, Gabriele, Imhof, Alexander, Kurrer, Michael O., Schaer, Dominik J.·2006·Circulation Research

Abstract

Heme toxicity contributes to the pathogenesis of chronic inflammatory diseases, atherosclerosis, and hemolysis associated vasculopathy. Macrophage clearance of cell free hemoglobin (Hb) is thus an essential homeostatic function of these cells. We examined the transcriptional response of human PBMC derived macrophages to Hb by gene array analysis. The observed noninflammatory macrophage response was characterized by induction of an antioxidative and antiinflammatory gene expression pattern with most prominent induction of the inducible heme oxygenase (HO-1). The metabolically active Hb-CD163-HO-1 pathway resulted in synthesis of ferritin—1 of the antioxidative and antiinflammatory end products linked to heme breakdown by HO-1. This response was mediated by the Hb scavenger receptor CD163 and heme and was not related to Hb mediated depletion of reduced glutathione. In contrast to other cellular responses induced by CD163, there was no role of protein phosphorylation dependent CD163 signaling in the protective macrophage response to Hb. Instead, CD163 acted as an Hb transporter, which undergoes constitutive and ligand independent internalization and recycling between the cell surface and early endosomes. The expression of CD163 and HO-1 in macrophages of neovascularized atherosclerotic lesions suggests that the pathway described herein is active in vivo. Noninflammatory Hb clearance and intimately linked HO-1 expression may provide the long sought-after explanation for the antiinflammatory activity associated with CD163-positive macrophages.

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Crossref · 10.1161/01.res.0000247067.34173.1b

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Authors
Schaer, C. A., Schoedon, G., Imhof, A., Kurrer, M. O., & Schaer, D. J.
Affiliations
University Hospital Zurich (CH)
Venue
Circulation Research
Published
2006-10-27
Volume
99
Issue
9
Pages
943-950
ISSN
  • 0009-7330 (ISSN-L)
  • 1524-4571
OpenAlex
W2114374333
Cited by
267
References
36
Citations by year
2026: 7 · 2025: 6 · 2024: 12 · 2023: 10 · 2022: 11 · 2021: 12 · 2020: 11 · 2019: 11 · 2018: 13 · 2017: 19 · 2016: 19 · 2015: 19 · 2014: 19 · 2013: 16 · 2012: 16
FWCI
5.16
Type
journal article
Language
en
Open access
closed
Locations
  • Circulation Research (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Heme Oxygenase-1 and Carbon Monoxide
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Hemoglobin structure and function
  • Life Sciences › Immunology and Microbiology › Immunology › Phagocytosis and Immune Regulation
Keywords
CD163, free hemoglobin, heme toxicity, heme oxygenase-1, endocytosis, atherosclerosis, neovascularization, oxidative stress, endosomal recycling
MeSH terms
CD163 Antigen, Cells, Cultured, Endocytosis, Glutathione, Heme, Hemoglobins, Humans, Inflammation, Macrophages, Neovascularization, Pathologic, Receptors, Cell Surface, Endosomes, RNA, Messenger, Transcription, Genetic, Antigens, Differentiation, Myelomonocytic, Antigens, CD, Gene Expression Regulation, Enzymologic, Cytoprotection, Gene Expression Profiling, Atherosclerosis, Receptors, Scavenger, Heme Oxygenase-1

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