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Blood, 1 March 2005, Vol. 105, No. 5, pp. 2189-2197. Prepublished online as a Blood First Edition Paper on November 2, 2004; DOI 10.1182/blood-2004-07-2757.
Submitted July 20, 2004
Institute for Cellular Therapeutics, University of Louisville, Louisville, KY, USA * Corresponding author; email: suzanne.ildstad{at}louisvile.edu.
Type 1 diabetes is a systemic autoimmune disease that can be cured by transplantation of HSC from disease-resistant donors. NOD mice have a number of features that distinguish them as BMT recipients that must be understood prior to the clinical application of chimerism to induce tolerance. In the present studies, we characterized NOD HSC, comparing their engraftment characteristics to HSC from disease-resistant strains. Strikingly, NOD HSC are significantly enhanced in engraftment-potential compared to HSC from disease-resistant donors. Unlike HSC from disease-resistant strains, they do not require graft facilitating cells to engraft in allogeneic recipients. Additionally, they exhibit a competitive advantage when co-administered with increasing numbers of syngeneic HSC, produce significantly more CFU-S in vivo in allogeneic recipients, and more CFU-GM in vitro compared to HSC from disease-resistant controls. NOD HSC also exhibit significantly enhanced chemotaxis to an SDF-1 gradient and adhere significantly better on primary stroma. This enhanced engraftment-potential maps to the Idd9 locus, and as such the TNF receptor family as well as ski/sno genes may be involved in the mechanism underlying the autonomy of NOD HSC. These findings may have important implications to understand the evolution of autoimmune disease and impact upon potential strategies for cure.
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