Bone marrow niche adhesion and homing receptors

Bone marrow niche adhesion and homing receptors are a collective group of cell surface proteins that govern the migration, anchoring, and retention of hematopoietic stem cells (HSCs) and immune cells within the bone marrow microenvironment. Key components of this system include the chemokine receptor CXCR4, integrins such as Very Late Antigen-4 (VLA-4), and selectins like E-selectin, which interact with ligands such as CXCL12 (SDF-1) and VCAM-1. These receptors are essential for "homing," the process by which cells find their way from the blood to the marrow, and for maintaining the "niche" that protects cells from external stressors. In hematologic malignancies, such as acute myeloid leukemia and multiple myeloma, cancer cells exploit these receptors to remain in protective marrow environments, leading to environment-mediated drug resistance (EM-DR). Therapeutic targeting of these receptors aims to mobilize both healthy stem cells for transplantation and malignant cells into the peripheral circulation to enhance their sensitivity to chemotherapy. Consequently, these receptors are pivotal in both regenerative medicine and oncology for disrupting the protective interactions between cells and the bone marrow stroma.

Other names

Bone marrow homing receptorsHematopoietic stem cell niche receptorsBone marrow adhesion moleculesHSC niche receptorsMarrow trafficking receptors

Antagonism of CXCR4 to disrupt the SDF-1/CXCR4 axis for hematopoietic stem cell mobilization; inhibition of integrin-mediated adhesion (e.g., VLA-4) to prevent cell anchoring; blockade of E-selectin to interfere with leukemic cell sequestration and chemoresistance.