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• W2103769076 abstract "Defective complement regulation results in hemolytic uremic syndrome (HUS), a disease that is characterized by microangiopathy, thrombocytopenia, and acute renal failure and that causes endothelial cell damage. For characterization of how defective complement regulation relates to the pathophysiology, the role of the complement regulator factor H and also of a mutant factor H protein was studied on the surface of human umbilical vein endothelial cells. The mutant 145-kD factor H protein was purified to homogeneity, from plasma of a patient with HUS, who is heterozygous for a <i>factor H</i> gene mutation G3587T, which introduces a stop codon at position 1172. Functional analyses show that the lack of the most C-terminal domain short consensus repeats 20 severely affected recognition functions (<i>i.e.</i>, binding to heparin, C3b, C3d, and the surface of endothelial cells). Wild-type factor H as well as the mutant protein formed dimers in solution as shown by cross-linking studies and mass spectroscopy. When assayed in fluid phase, the complement regulatory activity of the mutant protein was normal and comparable to wild-type factor H. However, on the surface of endothelial cells, the mutant factor H protein showed severely reduced regulatory activities and lacked protective functions. Similarly, with the use of sheep erythrocytes, the mutant protein lacked the protective activity and caused increased hemolysis when it was added to factor H–depleted plasma. This study shows how a mutation that affects the C-terminal region of the factor H protein leads to defective complement control on cell surfaces and damage to endothelial cells in patients with HUS. These effects explain how mutant factor H causes defective complement control and in HUS—particularly under condition of inflammation and complement activation—causes endothelial cell damage." @default.
• W2103769076 created "2016-06-24" @default.
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• W2103769076 date "2007-02-01" @default.
• W2103769076 modified "2023-09-30" @default.
• W2103769076 title "Hemolytic Uremic Syndrome" @default.
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• W2103769076 doi "https://doi.org/10.1681/asn.2006091069" @default.
• W2103769076 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/17229916" @default.
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