31/03/2026
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Erythropoietin (EPO) is a glycoprotein hormone that is primarily produced by the kidneys, playing a vital role in the regulation of red blood cell production, also known as erythropoiesis.
Red blood cells are responsible for transporting oxygen from the lungs to body tissues to aid in proper biological function. EPO release is triggered by specialized cells in the kidneys that detect low blood oxygen level by relaying information to the bones to make more red blood cells. Similarly, when these specialized cells detect enough oxygen in the blood, it tells the kidneys to make less EPO. Healthcare providers measure EPO levels with a blood test to figure out what factors affect how the body releases EPO. Inappropriately high levels of EPO causes high levels of red blood cells (polycythemia) causing the blood to thicken, it may result from anemia, tumors, or possible long-exposure to low blood oxygen levels. On the other hand, low levels of EPO may be due to damaged kidneys or also known as Chronic Kidney Disease (CKD), or from existing anemic disorders.
Erythropoietin binds to specific EPO-receptors on the surface of erythroid progenitor cells in the bone marrow, triggering intracellular signaling pathways. This binding activates the JAK2/STAT5 pathways, which promotes gene expression involved in the production of red blood cells, cell growth, and survival. It also prevents programmed cell death or apoptosis by activating the apoptosis inhibitor Bcl-x 3, allowing immature red blood cells to mature properly. Additionally, EPO activates other signaling pathways that further support the proliferation and differentiation of red blood cells.
References:
Erythropoietin. (2026). Cleveland Clinic. https://my.clevelandclinic.org/health/articles/14573-erythropoietin
Erythropoietin: Uses, Interactions, Mechanism of Action. (n.d.). DrugBank. https://go.drugbank.com/drugs/DB00016
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