Why does billirubin increase in intravascular haemolysis?

[sameeralord]

Hello everyone,

Ok so red blood cells break and release haemoglobin. Now I checked a book and it all it showed is that this haemoglobin binds to haptoglobin and goes to liver. Now billirubin is made by reticulocytes in spleen using haem. So does liver break this haemoglobin haptoglobin complex, and release haem into the circulation, so reticulocytes in spleen can act on it or does this haemoglobin travel to spleen? Thanks

 

[thorium1010]

Hello everyone,

Ok so red blood cells break and release haemoglobin. Now I checked a book and it all it showed is that this haemoglobin binds to haptoglobin and goes to liver. Now billirubin is made by reticulocytes in spleen using haem. So does liver break this haemoglobin haptoglobin complex, and release haem into the circulation, so reticulocytes in spleen can act on it or does this haemoglobin travel to spleen? Thanks

Hb is broken down to haem and globin which is converted to biliverdin and then to bilirubin.

Bilirubin is transported to the liver where it is conjugated.

In hemolysis , the production of bilirubin outstrips its conjugation and removal through excretion. Hence the hyberbilirubinemia.