ABSTRACT
The human plasma protein factor H, which is a multifunctional, multidomain protein,
acts as a central regulator of the complement system. In addition to its complement
regulatory activities, factor H has multiple physiological activities and 1) acts
as an extracellular matrix component, 2) binds to cellular receptors of the integrin
type, and 3) interacts with a wide selection of ligands, such as the C-reactive protein,
thrombospondin, bone sialoprotein, osteopontin, and heparin. Recent genetic reports,
which show involvement of factor H in the human disease hemolytic-uremic syndrome
(HUS), have attracted the attention of both clinicians and basic complement researchers
to the role of factor H in the pathophysiology of HUS.
KEYWORD
Hemolytic-uremic syndrome - HUS - complement system - complement factor H - physiological
functions of factor H