Knowra Erythropoiesis Erythropoiesis Erythropoiesis is the production of red blood cells from hematopoietic stem and progenitor cells. It proceeds through recognizable precursor stages before mature cells enter the circulation.
Hematopoietic stem cell : A self-renewing bone-marrow cell that can produce all blood-cell lineages. Erythroid cells ultimately descend from this multipotent starting population.
Erythropoietin : A hormone, produced mainly by the kidneys in adults, that promotes survival and maturation of erythroid progenitors. Low oxygen availability raises erythropoietin, increasing support for red-cell production.
Anemia : A condition in which blood has reduced oxygen-carrying capacity, commonly due to low hemoglobin or too few red cells. Impaired or inadequate erythropoiesis is a major cause of anemia.
Granulopoiesis : The production of granulocytes, including neutrophils, eosinophils, and basophils, from hematopoietic progenitors. It is another marrow lineage, but produces immune cells rather than oxygen-carrying cells.
BFU-E : An early erythroid progenitor that forms large, multi-cluster colonies in culture. It marks an early committed stage before erythroid colonies become smaller and more defined.
Hypoxia-inducible factor : A family of transcription factors that regulate cellular responses to low oxygen. It links tissue oxygen shortage to increased erythropoietin gene expression.
Polycythemia vera : A chronic myeloproliferative neoplasm characterized by excessive production of red blood cells, usually associated with JAK2 mutations. It illustrates red-cell overproduction driven by a clonal marrow disorder rather than normal oxygen feedback.
Thrombopoiesis : The production of platelets from megakaryocytes in the bone marrow. It offers a parallel blood-cell production pathway with distinct precursor stages and regulatory signals.
CFU-E : A late erythroid progenitor that responds strongly to erythropoietin and produces erythroblasts. This progenitor is a key point at which erythropoietin supports erythroid survival and expansion.
Iron metabolism : The processes that absorb, transport, store, and recycle iron in the body. Developing red cells require iron to build heme and hemoglobin.
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