Bloody Minded Episode 77 - The Factory Must Grow | Myelopoiesis
Feb 10, 2026
A nerdy tour through how the body's myeloid factory makes red cells, platelets and a flood of white cells. They map stem cell branching and the key progenitors that set cell fates. Growth factors like EPO, TPO and GCSF get spotlighted, including clinical uses and side effects. The crew also explain emergency myelopoiesis and how marrow reprioritizes during stress.
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Myeloid Compartment Is Vast And Inclusive
- Myeloid cells include everything on a full blood count except lymphocytes, covering red cells, platelets, and granulocytes.
- The body produces hundreds of billions of myeloid cells daily to replace normal loss and consumption.
Stem Cells Are Rare; Progenitors Do The Heavy Lifting
- Hematopoietic stem cells divide rarely and create multipotent progenitors that do daily work of making blood.
- Progenitors progressively restrict fate, sometimes committing early and sometimes late on the path to specific lineages.
Hematopoiesis Is Plastic Not Strictly Linear
- Hematopoiesis isn't strictly linear; some precursors are pre-committed while others remain flexible and can change with context.
- Single-cell data suggest overlap and plasticity rather than a simple one-way flow chart.