Abstract :
[en] In the context of allogeneic bone marrow transplantation, an accurate estimate of the risk of developing graft-versus-host
disease GVHD. is of major interest. The pre-transplant frequency of donor’s helper T-lymphocyte precursors HTLp.
directed against host’s antigens may be helpful in predicting this risk. This technique relies on an indirect measurement of
interleukin-2 IL-2. secreted by the HTLp, as assessed by the proliferation of an IL-2 dependent cell line. Many authors use
the murine CTLL-2 cell line in this assay, but these cells do not respond to the presence of minute amounts of IL-2 in the
culture medium, and thus do not discriminate between the absence or the presence of very low levels of IL-2. We therefore
decided to compare CTLL-2 with another IL-2 dependent cell line, the murine A9.12 cell line. A comparison was made
using serial dilutions of recombinant human IL-2, limiting dilutions of baby hamster kidney BHK. cells transfected with
human IL-2 gene and in the context of clinical tests performed for the detection of pre-transplant HTLp. Both the sensitivity
and reliability of the tests were better using A9.12. We conclude that the A9.12 cell line might be a more suitable tool for
pre-transplant HTLp determinations before allogeneic bone marrow transplantation or whenever low IL-2 levels are to be
measured.
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