Adult hematopoietic stem cells activate a normally fetal-restricted program to functionally expand ex vivo.
Adult hematopoietic stem cells activate a fetal-restricted gene, Lin28b, to achieve functional ex vivo expansion, with overexpression improving aged HSC reconstitution by 2-3 times.
- Why it matters: Expanding transplantable hematopoietic stem cells (HSCs) ex vivo is crucial for advancing therapies and research, but the molecular mechanisms behind successful expansion remain unclear, especially for aged cells.
- What they did: The study analyzed HSCs from fetal liver, young, and aged mouse bone marrow, focusing on Lin28b expression and its role in ex vivo expansion and reconstitution potential, using gene expression profiling and functional assays.
- The result: Lin28b was identified as a key regulator, with higher expression correlating with better reconstitution; overexpressing Lin28b enhanced aged HSC function, opening new avenues for HSC rejuvenation and clinical use.