Hematopoietic stem cell niche (HSC niche) (HSC niche)

The hematopoietic stem cell (HSC) niche, or host hematopoietic microenvironment, is a specialized anatomical location within the bone marrow that regulates the maintenance, self-renewal, and differentiation of hematopoietic stem cells (Schofield, R. 1978. Blood Cells). It is a complex system comprising various cell types, including osteoblasts, endothelial cells, and mesenchymal stromal cells, which provide essential physical and chemical cues through the secretion of factors like CXCL12 and Stem Cell Factor (SCF) (Morrison, S. J., & Scadden, D. T. 2014. Nature). This environment plays a critical role in protecting HSCs from exhaustion and is often subverted in hematologic malignancies to support the survival and chemoresistance of cancer cells (Crane, G. M., et al. 2017. Nature Reviews Cancer). Therapeutic strategies targeting the niche often focus on disrupting the interactions between HSCs and their environment, such as using the CXCR4 antagonist plerixafor to mobilize stem cells into the peripheral blood for transplantation (Lévesque, J. P., et al. 2010. Current Opinion in Hematology). Additionally, drugs like G-CSF (filgrastim) act on the niche to stimulate the production and release of neutrophils and stem cells by inducing the release of proteases that cleave anchoring molecules (Petit, I., et al. 2002. Nature Immunology). Understanding the niche's architecture and signaling is vital for developing treatments for leukemia, bone marrow failure, and immune-related disorders.

Other names

Bone marrow microenvironmentBone marrow nicheHematopoietic microenvironmentHematopoietic stem cell niche

CXCR4 antagonism; G-CSF receptor agonism; Immunomodulation; Proteasome inhibition