Bone marrow microenvironment controls the“fate”of hematopoietic stem cells / 中国组织工程研究

ABSTRACT

BACKGROUND:Hematopoietic microenvironment regulates hematopoietic stem cel s mainly through the cel-cel , cel-soluble regulator and cel-extracel uar matrix modes. OBJECTIVE:To review the molecular mechanism underlying regulation of hematopoietic stem cel s under the cel-cel , cel-soluble factors and cel-extracel ular matrix modes. METHODS:A computer-based online search of PubMed database was performed to search related articles with the key words of“Niche, HSC, VCAM-1, VLA-4, TPO, MPL, ECM, Integrin, N-cadherin, ANG-1, Tie2, VLA-5, Jagged-1, Notch, CXCL12, CXCR4, SCF, Kit, BMPs/TGF-β, TGF-βR, IFNα, IFNαR”in English. Irrelevant or repetitive studies as wel as old literature were excluded, and final y 80 articles were included in result analysis. RESULTS AND CONCLUSION:Cel s on the endosteal surface, vascular endothelial cel s, perivascular cel s, and some unknown or certain cel s or smal molecules in the bone marrow cavity constitute the specialized microenvironment for hematopoietic stem cel s. Hematopoietic stem cel s in the hematopoietic microenvironment remain a relatively steady state, which is the result of mutual contact of hematopoietic stem cel s and hematopoietic microenvironment under the regulation of some important molecules, such as Pten and osteopontin, via the pathway between cel-intercel ular adhesions, intercel ular soluble factors, and cel s and extracel ular matrix.