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Hemosiderinuria (syn. haemosiderinuria) is the presence of hemosiderin in urine. [1] It is often the result of chronic intravascular hemolysis, in which hemoglobin is released from red blood cells into the bloodstream in excess of the binding capacity of haptoglobin. The function of haptoglobin is to bind to circulating hemoglobin, thereby ...
Hemoglobinuria is a condition in which the oxygen transport protein hemoglobin is found in abnormally high concentrations in the urine. [1] The condition is caused by excessive intravascular hemolysis , in which large numbers of red blood cells (RBCs) are destroyed, thereby releasing free hemoglobin into the plasma . [ 2 ]
Hemosiderin or haemosiderin is an iron-storage complex that is composed of partially digested ferritin and lysosomes. The breakdown of heme gives rise to biliverdin and iron. [1] [2] The body then traps the released iron and stores it as hemosiderin in tissues. [3] Hemosiderin is also generated from the abnormal metabolic pathway of ferritin. [3]
Hemosiderin collects in the skin and is slowly removed after bruising; hemosiderin may remain in some conditions such as stasis dermatitis. Hemosiderin in the kidneys has been associated with marked hemolysis and a rare blood disorder called paroxysmal nocturnal hemoglobinuria. Hemosiderin may deposit in diseases associated with iron overload.
Iron is also stored as a pigment called hemosiderin, which is an ill-defined deposit of protein and iron, created by macrophages where excess iron is present, either locally or systemically, e.g., among people with iron overload due to frequent blood cell destruction and the necessary transfusions their condition calls for. If systemic iron ...
Long-term hemoglobinuria is associated with substantial deposition of hemosiderin in proximal tubule (excessive accumulation of hemosiderin in proximal tubule), Fanconi syndrome (damaged renal re-absorption capability of small molecules which give rises to hyper-aminoaciduria, glycosuria, hyperphosphaturia, and bicarbonate and dehydration), and ...
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