Characterization of natural suppressor cells in human bone marrow

Stem Cells
K SugiuraS Ikehara


Natural suppressor (NS) cells, which exert nonspecific suppressive activity in an unprimed manner, have been found in mouse, rabbit and monkey bone marrow (BM). In the present study, we characterize NS cells in human BM. NS activity was found in a fraction of low density (1.055-1.065 g/ml) BM cells that had been depleted of T cells, B cells, and monocytes. The NS activity was significantly decreased by the depletion of CD34+ or CD33+ cells but not CD56+ cells. The NS activity was indeed detected in isolated CD34+ cells and further enriched in CD34+CD33+ cells. Hematopoietic progenitor cells committed to the myeloid lineage were also enriched in the CD34+CD33+ cells, which significantly correlated to the NS activity. From these findings, it is strongly suggested that NS activity in human BM is exerted by the myeloid hematopoietic progenitors. Since cell-to-cell contact was not necessary for the action, NS cells seemed to secrete soluble mediator(s). Transforming growth factor-beta 1 and leukemia inhibitory factor were, however, not the candidates, based on experiments using neutralizing antibodies.


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Oct 7, 2000·Bulletin of Experimental Biology and Medicine·V V SenyukovV A Kozlov
Apr 17, 2008·International Journal of Cancer. Journal International Du Cancer·Rachid MarhabaMargot Zöller
Dec 13, 2006·Veterinary Immunology and Immunopathology·Viskam WijewardanaToshio Inaba
Sep 19, 2006·Biomedicine & Pharmacotherapy = Biomédecine & Pharmacothérapie·J A CampilloJ L Subiza

Related Concepts

CD33 protein, human
Cd33 protein, mouse
Bone Marrow Cells
Cell Separation
Hematopoiesis, Medullary
Antigens, Differentiation, Myelomonocytic
Leukocyte Differentiation Antigens, Human
Transforming Growth Factor beta
CD34 Antigens

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