Abstract:
BACKGROUND:Recent data show the efficacy of embryonic stem cells (ESC) to engraft in allogeneic recipients without host pretreatment. This property is due to their low expression of major histocompatibility complex (MHC) class I antigens and lack of MHC class II expression. Here, we tested the hypothesis that the constitutive FasL expression by ESC is a requirement for their stable engraftment in allogeneic recipients. METHODS:MRL and MRL-lpr/lpr mice (H-2k) were infused allogeneic 129SvJ RW-4 (H-2b) ESC without host preconditioning. The development of mixed chimerism was monitored over 100 days by flow cytometry. RESULTS:Mixed chimerism was detectable by day 7. The amount of donor cells detected varied between 3-5.5% and were lymphoid, but nonmyeloid. Only 50% of lpr/lpr mice engrafted and lost donor cells by day 28 post-ESC infusion. In contrast, >80% wild type mice engrafted and maintained mixed chimerism up to day 100. CONCLUSIONS:These data suggest a critical role for Fas-FasL engagement in ESC engraftment. We conclude that ESC may induce clonal deletion of alloreactive T cells by Fas-induced apoptosis in recipient T cells, protecting them from rejection. The data provide a rationale for improved protocols for the achievement of robust ESC-induced mixed chimerism.
journal_name
Transplantationjournal_title
Transplantationauthors
Fabricius D,Bonde S,Zavazava Ndoi
10.1097/01.tp.0000159142.62535.37subject
Has Abstractpub_date
2005-05-15 00:00:00pages
1040-4issue
9eissn
0041-1337issn
1534-6080pii
00007890-200505150-00016journal_volume
79pub_type
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