The Journal of Immunology, Vol 151, Issue 1 29-37, Copyright © 1993 by American Association of Immunologists

ARTICLES

A novel population of natural killer progenitor cells isolated from human umbilical cord blood

FM Cicuttini, M Martin, HT Petrie and AW Boyd
Lions Clinical Cancer Research Laboratory, Walter and Eliza Hall Institute of Medical Research, PO Royal Melbourne Hospital, Australia.

In this report, we describe the isolation of a unique subpopulation of CD7+ cells from human fetal blood. Umbilical cord blood was first immuno-rosette-depleted using T cell, B cell, granulocyte, and macrophage markers to isolate a Lin- population. The Lin- cells were further characterized by cell sorting. As expected, the CD34+Lin- population (30%) was homogeneous and highly enriched for hemopoietic progenitors. Somewhat surprisingly, the CD34-Lin- population was also shown to be relatively homogeneous, with over 95% of cells expressing CD7. This CD34-Lin-CD7+ population was shown to be negative for all other T cell markers tested (i.e., CD7+1-2-3-4-8-). However, approximately 30% of these cells were positive for the NK cell surface markers CD16 and CD56 (CD7+NK+). Both CD7+NK+ and CD7+NK- populations proliferated in response to stimulation in vitro with IL-2/PHA/PHA- conditioned medium. After such treatment, approximately 40% of the CD7+NK- acquired CD56 and 20% CD16, whereas about 20% of the CD7+NK+ population became CD2+. The significance of the 60% of CD7+NK- cells that did not acquire other markers remains to be determined. In addition, although neither population was cytotoxic when first isolated, both populations acquired the ability to lyse the NK target cell line K562 while cultured under these conditions. These data suggest that these two populations may represent a developmental sequence among NK cell precursors in human umbilical cord blood. Additional analysis of such precursors may be useful in understanding the ontogeny of NK cells in vivo.

This article has been cited by other articles:

				E. Bremer, B. t. Cate, D. F. Samplonius, L. F. M. H. de Leij, and W. Helfrich CD7-restricted activation of Fas-mediated apoptosis: a novel therapeutic approach for acute T-cell leukemia Blood, April 1, 2006; 107(7): 2863 - 2870. [Abstract] [Full Text] [PDF]

				E. Bremer, D. F. Samplonius, M. Peipp, L. van Genne, B.-J. Kroesen, G. H. Fey, M. Gramatzki, L. F.M.H. de Leij, and W. Helfrich Target Cell-Restricted Apoptosis Induction of Acute Leukemic T Cells by a Recombinant Tumor Necrosis Factor-Related Apoptosis-Inducing Ligand Fusion Protein with Specificity for Human CD7 Cancer Res., April 15, 2005; 65(8): 3380 - 3388. [Abstract] [Full Text] [PDF]

				M. Peipp, H. Kupers, D. Saul, B. Schlierf, J. Greil, S. J. Zunino, M. Gramatzki, and G. H. Fey A Recombinant CD7-specific Single-Chain Immunotoxin Is a Potent Inducer of Apoptosis in Acute Leukemic T Cells Cancer Res., May 1, 2002; 62(10): 2848 - 2855. [Abstract] [Full Text] [PDF]

				C. S. Heinly, G. D. Sempowski, D. M. Lee, D. D. Patel, P. M. McDermott, R. M. Scearce, C. B. Thompson, and B. F. Haynes Comparison of thymocyte development and cytokine production in CD7-deficient, CD28-deficient and CD7/CD28 double-deficient mice Int. Immunol., February 1, 2001; 13(2): 157 - 166. [Abstract] [Full Text] [PDF]

				S. S. Joshi, S. R. Tarantolo, C. A. Kuszynski, and A. Kessinger Antitumor Therapeutic Potential of Activated Human Umbilical Cord Blood Cells against Leukemia and Breast Cancer Clin. Cancer Res., November 1, 2000; 6(11): 4351 - 4358. [Abstract] [Full Text] [PDF]

				D. M. Lee, H. F. Staats, J. S. Sundy, D. D. Patel, G. D. Sempowski, R. M. Scearce, D. M. Jones, and B. F. Haynes Immunologic Characterization of CD7-Deficient Mice J. Immunol., June 15, 1998; 160(12): 5749 - 5756. [Abstract] [Full Text] [PDF]