Cross-linking of FcgammaR triggers shedding of the hemoglobin-haptoglobin scavenger receptor CD163.

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Citation

Sulahian TH, Pioli PA, Wardwell K, Guyre PM

Cross-linking of FcgammaR triggers shedding of the hemoglobin-haptoglobin scavenger receptor CD163.

J Leukoc Biol. 2004 Jul;76(1):271-7. Epub 2004 Apr 9.

PubMed ID
15075364 [ View in PubMed
]
Abstract

CD163, the hemoglobin (Hb)-haptoglobin scavenger receptor, is a monocyte/macrophage-restricted member of the scavenger receptor, cysteine-rich family of proteins. In addition to being expressed on the cell surface, a soluble form of CD163 has also been reported. Like tumor necrosis factor alpha (TNF-alpha), surface CD163 is proteolytically cleaved from the plasma membrane in response to lipopolysaccharide (LPS) stimulation. As cross-linking of the Fcgamma receptor (FcgammaR) is similarly known to induce TNF-alpha shedding, the effect of FcgammaR stimulation on CD163 shedding was investigated. We found that FcgammaR stimulation resulted in a rapid release of surface CD163 into the supernatant that was blocked by inhibitors of protein kinase C and tyrosine kinases. Although LPS and FcgammaR stimulation in short-term cultures suppressed CD163 mRNA expression, long-term cultures of monocytes treated with LPS-but not with a FcgammaR cross-linking reagent-resulted in an interleukin-10-dependent recovery of surface CD163 expression. These studies suggest that the presence of immune complexes in infection or autoimmunity may radically alter the nature of CD163-dependent monocyte/macrophage processes. This may be particularly important in disease states in which immune complexes and high levels of free Hb are present, such as in autoimmune hemolytic anemia, transfusion reactions, or infections by hemolytic bacteria.

DrugBank Data that Cites this Article

Polypeptides
NameUniProt ID
Scavenger receptor cysteine-rich type 1 protein M130Q86VB7Details