Purpose of Review: Blood cell production is maintained by hematopoietic stem cells (HSCs) that reside in specialized niches within bone marrow. Treatment with granulocyte-colony stimulating factor (G-CSF) causes HSC egress from bone marrow niches and trafficking to the peripheral blood, a process termed 'mobilization'. Although the mobilization phenomenon has been known for some time and is utilized clinically to acquire HSC for transplant, the mechanisms mediating HSC release are not completely understood. We discuss recent advances and controversies in defining the mechanisms responsible for G-CSF-induced mobilization. Recent Findings: New reports define a role for resident monocytes/macrophages in maintaining niche cells, which is diminished after G-CSF treatment, suggesting a new mechanism for mobilization. Although osteoblasts have been reported to be a primary component of the HSC niche, new results suggest a unique niche composed of innervated mesenchymal stem cells. Modulating bioactive lipid signaling also facilitates mobilization, and may define a future therapeutic strategy. Summary: Hematopoietic mobilization by G-CSF is primarily mediated by alterations to the bone marrow niche by both direct and indirect mechanisms, rather than directly altering HSC function. Further understanding of the processes mediating mobilization will advance our understanding on the cellular and molecular components of the HSC niche.
- granulocyte-colony stimulating factor
- hematopoietic stem cell
ASJC Scopus subject areas
Many mechanisms mediating mobilization : An alliterative review. / Hoggatt, Jonathan; Pelus, Louis.In: Current Opinion in Hematology, Vol. 18, No. 4, 07.2011, p. 231-238.
Research output: Contribution to journal › Article
TY - JOUR
T1 - Many mechanisms mediating mobilization
T2 - An alliterative review
AU - Hoggatt, Jonathan
AU - Pelus, Louis
PY - 2011/7
Y1 - 2011/7
N2 - Lippincott Williams & Wilkins.
AB - Lippincott Williams & Wilkins.
KW - granulocyte-colony stimulating factor
KW - hematopoietic stem cell
KW - microenvironment
KW - mobilization
KW - niche
UR - http://www.scopus.com/inward/record.url?scp=79958815896&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=79958815896&partnerID=8YFLogxK
U2 - 10.1097/MOH.0b013e3283477962
DO - 10.1097/MOH.0b013e3283477962
M3 - Article
VL - 18
SP - 231
EP - 238
JO - Current Opinion in Hematology
JF - Current Opinion in Hematology
SN - 1065-6251
IS - 4