Bone marrow microenvironment

The bone marrow microenvironment consists of a dynamic and spatially organized network of hematopoietic and non-hematopoietic (stromal) cells, extracellular matrix proteins, blood vessels, and nerve fibers within the bone marrow cavity. This niche regulates the maintenance, proliferation, differentiation, and trafficking of hematopoietic stem and progenitor cells by providing both structural support and biochemical cues, such as cytokines and growth factors. Alterations in the bone marrow microenvironment, including those driven by malignant infiltration or infection, can profoundly influence disease pathogenesis, therapeutic resistance, and patient outcomes. Because it mediates cell survival, proliferation, and immune responses, it is increasingly recognized as both a regulator in health/disease and a source of novel therapeutic targets—particularly in acute myeloid leukemia and multiple myeloma. However, as it is a context and not a molecule, all therapeutic interventions act through modulation of cell-cell and cell-matrix interactions or local signaling pathways within the bone marrow. Key caveat: The bone marrow microenvironment is not a molecule, protein, or classical drug target (such as a receptor or enzyme), but rather a composite environment that serves as a therapeutic context for intervention through drugs that modulate cell-extracellular matrix interactions, cellular signaling, or niche function.

Other names

bone marrow nicheBM microenvironmenthematopoietic microenvironment

Disruption of cell adhesion between malignant cells and stromal microenvironment; Inhibition of cytokine or chemokine signaling (e.g., antagonists of CXCL12/CXCR4 axis); Modulation of immune cell activation within the microenvironment; Inhibition of angiogenesis; Modulation of stromal cell function