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Haptoglobin genotype modulates the balance of Th1/Th2 cytokines produced by macrophages exposed to free hemoglobin.

Abstract：

:The haptoglobin genotype has been demonstrated to be an independent risk factor for CVD in multiple epidemiological studies. The primary function of haptoglobin is to mitigate the deleterious effects of extracorpuscular hemoglobin. We sought to determine if the protein products of the two haptoglobin alleles differed in their ability to modulate the cytokine profile produced by macrophages in response to hemoglobin. Peripheral blood mononuclear cells were isolated from normal human volunteers and cultured in the presence of complexes formed by the protein products of the two different haptoglobin alleles with hemoglobin. The release of specific cytokines in the conditioned media of these cells was assessed by ELISA. We found that the haptoglobin 1 allele protein product-hemoglobin complex stimulated the secretion of significantly more Il-6 and Il-10 than the haptoglobin 2 allele protein product-hemoglobin complex. We demonstrate that the release of these cytokines is dependent on the liganding of the haptoglobin-hemoglobin complex to the CD163 receptor and the activity of casein kinase II. Haptoglobin genotype modulates the balance of inflammatory (Th1) and anti-inflammatory (Th2) cytokines produced by macrophages exposed to free hemoglobin. This may have implications in understanding inter-individual differences in the inflammatory response to hemorrhage.

journal_name

Atherosclerosis

journal_title

Atherosclerosis

authors

Guetta J,Strauss M,Levy NS,Fahoum L,Levy AP

doi

10.1016/j.atherosclerosis.2006.04.032

subject

Has Abstract

pub_date

2007-03-01 00:00:00

pages

48-53

issue

1

eissn

0021-9150

issn

1879-1484

pii

S0021-9150(06)00245-0

journal_volume

191

pub_type

杂志文章

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