[Bone Marrow Osteoblasts Promotes the Proliferation Leukemia Stem Cell by Up-regulating Interleukin-1]

Area of Science:

• Hematology
• Oncology
• Cell Biology

Background:

• The bone marrow microenvironment plays a crucial role in regulating leukemia cell behavior.
• Osteoblasts, a key component of the bone marrow niche, may influence leukemia stem cell survival and proliferation.

Purpose of the Study:

• To investigate the role of the osteoblast niche in regulating leukemia cell proliferation and self-renewal.
• To explore the mechanism by which osteoblasts upregulate interleukin-1 (IL-1) expression in leukemia cells.

Main Methods:

• RNA sequencing and gene set enrichment analysis (GSEA) of leukemia cells from AE9a mouse models.
• Quantitative real-time PCR (qRT-PCR) to measure IL-1 expression in co-cultured leukemia cells and osteoblasts.
• Colony formation assays to assess leukemia cell proliferation and self-renewal.
• Analysis of IL-1 expression in bone marrow mononuclear cells (BMMNC) from acute myeloid leukemia (AML) patients.

Main Results:

• Leukemia cells in the osteoblast niche showed significantly higher expression of IL-1α and IL-1β.
• Co-culturing leukemia cells with osteoblasts in vitro increased IL-1α and IL-1β expression.
• Osteoblast co-culture and IL-1β treatment significantly enhanced leukemia cell colony formation.
• In AML patients, higher IL-1 expression in BMMNC correlated with a higher percentage of CD34 positive cells.

Conclusions:

• The osteoblast niche promotes leukemia cell proliferation and self-renewal by upregulating IL-1 expression.
• IL-1 is a key mediator in the interaction between osteoblasts and leukemia cells.
• IL-1 expression levels in AML patients may serve as a potential biomarker.