Human acute myeloid leukemia stem cells: evolution of concept

Area of Science:

• Hematology
• Cancer Biology
• Stem Cell Research

Background:

• The concept of leukemic stem cells (LSCs) revolutionized acute myeloid leukemia (AML) treatment strategies.
• Understanding AML pathogenesis has evolved from a single LSC model to a serial developmental model involving pre-LSCs and LSCs.

Purpose of the Study:

• To review the historical development and current understanding of acute myeloid leukemia stem cells (AMLSCs).
• To discuss the challenges posed by AMLSC heterogeneity and explore potential therapeutic targets.

Main Methods:

• Review of seminal studies and advancements in next-generation sequencing.
• Analysis of genetic mutations, immunophenotypic heterogeneity, and gene signatures in AMLSCs.
• Investigation into the bone marrow LSC niche.

Main Results:

• AMLSCs are characterized by specific markers (CD34+CD38-) and a serial developmental model.
• Significant genomic and immunophenotypic heterogeneity exists among AMLSCs, complicating biomarker discovery.
• Common gene signatures (e.g., 17-gene LSC score) and epigenetic factors (e.g., HOXA clusters) show promise as therapeutic targets.

Conclusions:

• Effective AMLSC-targeted therapies are currently lacking.
• Despite challenges, common molecular signatures and niche interactions offer potential avenues for developing novel AML treatments.
• Continued research into AMLSC biology and the bone marrow microenvironment is crucial for therapeutic advancements.