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Study Reveals PF4's Role in Aging Immune Function

10/17/2025

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Summary

Story summary

Researchers at the University of Illinois Chicago (UIC) report that platelet factor 4 (PF4) declines with age and influences aging of blood and immune cells.
PF4 regulates hematopoietic stem cells that produce myeloid and lymphoid cells essential for immune function.
As people age, hematopoietic stem cells produce more myeloid cells and weaken immune function.
In older mice and in human stem cells, supplying PF4 rejuvenates blood and immune cell function.
PF4 cannot reverse aging by itself.

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Story summary

Researchers at the University of Illinois Chicago (UIC) report that platelet factor 4 (PF4) declines with age and influences aging of blood and immune cells.
PF4 regulates hematopoietic stem cells that produce myeloid and lymphoid cells essential for immune function.
As people age, hematopoietic stem cells produce more myeloid cells and weaken immune function.
In older mice and in human stem cells, supplying PF4 rejuvenates blood and immune cell function.
PF4 cannot reverse aging by itself.