Self-renewal (process of stem cell self-renewal)

Self-renewal is the defining characteristic by which stem cells maintain their population over time through division while preserving their undifferentiated state. This capability ensures tissue homeostasis and repair throughout life. The process requires tight regulation involving intrinsic factors such as key transcription factors (Oct4, Sox2, Nanog), epigenetic modifications (DNA methylation/histone changes), and extrinsic cues from the microenvironment known as the niche. Multiple conserved signaling pathways govern this balance between maintaining “stemness” versus differentiation including Wnt/β-catenin, Notch, TGF-beta/Smad family members, JAK/STAT3 among others. These networks integrate signals controlling gene expression programs essential for sustaining multipotent/pluripotent states. Disruption in these regulatory mechanisms can lead either to loss-of-function causing degenerative diseases due to insufficient tissue regeneration or gain-of-function mutations resulting in cancers driven by aberrant activation of selfrenewing programs.

Other names

Stem cell self-renewalStem cell renewal

Drugs affecting this process typically act by modulating key signaling pathways or transcription factors that govern the balance between stem cell maintenance and differentiation. Examples include: - Inhibition or activation of JAK/STAT3 pathway influencing gene expression related to pluripotency and proliferation - Modulation of Wnt/β-catenin pathway stabilizing β-catenin for transcription factor activation supporting pluripotency genes like Oct4 and Nanog - Targeting TGF-beta/Smad signaling which regulates differentiation versus proliferation balance in hematopoietic stem cells