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Pyruvate kinase deficiency
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Pyruvate kinase deficiency is the glycolytic enzyme defect that most often ends up breaking red blood cells apart. Glycolysis is the pathway that pulls energy out of glucose, and red blood cell metabolism depends on it.
Pyruvate kinase carries out one specific step of that pathway: it converts phosphoenolpyruvate to pyruvate. That step alone supplies half of the red blood cell's ATP, and ATP is the cell's energy currency.
As that energy falls, the red blood cell loses deformability, the ability to bend and stretch to get through tight spots. And that is where the problem comes in, because the capillaries of the spleen and the liver are exactly those tight spots: they trap the defective red blood cells. A stiff red blood cell cannot pass through the narrow filter and gets stuck in it.
In brief
Pyruvate kinase deficiency is the glycolytic enzyme defect that most often causes red blood cell hemolysis.
Red blood cell metabolism depends on glycolysis, and this enzyme converts phosphoenolpyruvate to pyruvate, a step that supplies half of the cell's ATP.
As that ATP falls, the red blood cell loses deformability, and capillaries in the spleen and liver trap the defective cells.
A stiff red blood cell cannot pass through the narrow filter and gets stuck in it.
Sources (1)
- National Center for Biotechnology Information, StatPearls PublishingPyruvate Kinase Deficiency, StatPearlsPublished
This page explains the topic in general terms; it does not tell anyone what treatment to follow.
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