Hematopoietic stem and progenitor cell interactions with the bone marrow niche (HSPC-BM niche interactions)

Hematopoietic stem and progenitor cell (HSPC) interactions with the bone marrow niche encompass the complex molecular and cellular dialogues that govern the localization, maintenance, and release of blood-forming cells. The bone marrow niche is a highly organized microenvironment consisting of various cell types, including osteoblasts, endothelial cells, and mesenchymal stem cells, which provide essential signals like CXCL12 and Stem Cell Factor (SCF) (Nature Reviews Molecular Cell Biology, 2013, 14(10):615-626). These interactions are critical for maintaining the balance between HSPC quiescence and proliferation, ensuring a steady supply of blood cells throughout life (Blood, 2014, 124(8):1253-1262). In pathological states, such as leukemia, the niche can be hijacked to support the survival and chemoresistance of malignant cells. Pharmacological modulation of these interactions, primarily through the CXCR4-CXCL12 axis, is a standard clinical practice for mobilizing HSPCs for autologous or allogeneic transplantation (FDA, Mozobil Prescribing Information). Emerging therapies also aim to disrupt these protective interactions to enhance the efficacy of chemotherapy in hematologic malignancies (StatPearls, Hematopoietic Stem Cell Mobilization).

Other names

HSPC-niche axisBone marrow microenvironment interactionsHematopoietic stem cell nicheHSPC-BMNI

Pharmacological modulation involves CXCR4 antagonism to disrupt CXCL12-mediated retention, G-CSF receptor agonism to induce niche-cleaving proteases, and E-selectin or VLA-4 inhibition to prevent physical adhesion of cells to the bone marrow stroma.