The adherent layer that forms in human bone marrow suspension cultures contains fibroblast colonies which arise from colony-forming cells (CFU-F). We have demonstrated that recombinant interleukin-2 (r-IL2) inhibits growth of CFU-F by preventing their entry into S phase. This inhibition is not mediated by gamma-interferon, nor by T lymphocytes, and can be abrogated by anti-IL2 receptor antibody. r-IL2 may influence haematopoiesis by its effect on bone marrow CFU-F.
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MacDonald et al. (2009) studied this question.