Hematopoiesis-supporting stroma

The term "hematopoiesis-supporting stroma" refers to the complex network of nonhematopoietic cells within the bone marrow that provides structural and functional support for blood cell formation. This stroma is not a single molecular target but rather an ensemble that includes mesenchymal stromal/stem cells, endothelial cells, fibroblasts, adipocytes, osteoblasts/osteolineage cells, pericytes, macrophages, and neural elements[2][3][4][5]. These diverse cell types form specialized "niches" that regulate the self-renewal and differentiation of hematopoietic stem and progenitor cells through direct contact as well as secretion of soluble factors such as CXCL12/SDF1α, stem cell factor (SCF), intercellular adhesion molecules like ICAM1, transforming growth factor-beta (TGFβ), among others[2][3][5]. The stroma's primary function is to maintain normal blood production by providing both physical scaffolding and biochemical signals necessary for HSC survival. Disruption or dysfunction in this supportive environment can contribute to diseases such as bone marrow failure syndromes or malignancies like leukemia by altering normal regulatory cues[3]. The concept is operationally defined by its ability to support hematopoiesis in vitro or in vivo rather than being a discrete molecular entity[4]. Because "hematopoiesis-supporting stroma" describes a multicellular tissue context rather than an individual protein/receptor/enzyme/transporter typically considered drug targets in pharmacology or molecular medicine—and because it lacks canonical abbreviation—this entry should be flagged as incorrect if used where a specific therapeutic target is required.

Other names

Bone marrow stromal compartmentHematopoietic stromaBone marrow microenvironmentStromal cells of bone marrow