Hemoglobin and heme scavenging

The Haptoglobin-CD163-Heme Oxygenase-1 Pathway for Hemoglobin Scavenging

The haptoglobin- (Hp-) CD163-heme oxygenase-1 (HO-1) pathway is an efficient captor-receptor-enzyme system to circumvent the hemoglobin (Hb)/heme-induced toxicity during physiological and pathological hemolyses. In this pathway, Hb tightly binds to Hp leading to CD163-mediated uptake of the complex in macrophages followed by lysosomal Hp-Hb breakdown and HO-1-catalyzed conversion of heme into t...

Receptor targeting of hemoglobin mediated by the haptoglobins: roles beyond heme scavenging.

Haptoglobin, the haptoglobin-hemoglobin receptor CD163, and the heme oxygenase-1 are proteins with a well-established function in the clearance and metabolism of "free" hemoglobin released during intravascular hemolysis. This scavenging system counteracts the potentially harmful oxidative and NO-scavenging effects associated with "free" hemoglobin, and, furthermore, elicits an anti-inflammatory...

Heme, Myoglobin, Hemoglobin

Red cells, hemoglobin, heme, iron, and atherogenesis.

OBJECTIVE We investigated whether red cell infiltration of atheromatous lesions promotes the later stages of atherosclerosis. METHODS AND RESULTS We find that oxidation of ferro (FeII) hemoglobin in ruptured advanced lesions occurs generating ferri (FeIII) hemoglobin and via more extensive oxidation ferrylhemoglobin (FeIII/FeIV=O). The protein oxidation marker dityrosine accumulates in compli...

The Heme-globin Linkage of Hemoglobin

It was recently reported that CO hemoglobin is relatively more resistant than oxyhemoglobin to digestion by the pancreatic enzymes (l), and that a heme-protein fragment can be precipitated either from the digest solution or from the dialyzed digest by acidification with acetic acid (2). The composition of this CO product has now been investigated. Iron Content-The value of the iron to nitrogen ...