Abstract

Interleukin-3 (multi-CSF) is a multilineage haematopoietic growth regulator that initiates the proliferation and differentiation of multipotential stem cells1â5. Complementary DNA clones encoding interleukin-3 (IL-3) have recently been isolated6,7 and the structure of the IL-3 gene determined8,9. IL-3 is produced by T lymphocytes or T lymphomas only after stimulation with antigens, mitogens or chemical activators such as phorbol esters. The myelomonocytic leukaemia line WEHI-3B10,11 also produces IL-3 but its production is constitutive12â14 and the WEHI-3B cells do not appear to produce significant levels of any of the other lymphokines normally secreted by T lymphocytes after stimulation. It has been proposed that the genetic change leading to the constitutive expression of IL-3 may have been a key event in the development of this leukaemia2,3,15,16. We report here that the constitutive synthesis of IL-3 by the WEHI-3B cell line is due to the insertion of an endogenous retrovirus-like element close to the 5â² end of the gene. The insertion, an intracisternal A particle (IAP) genome, is positioned with its 5â² long terminal repeat (LTR) close to the promoter region of the IL-3 gene, resulting in constitutive synthesis of IL-3.
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Ymer, S., Tucker, W., Sanderson, C. et al. Constitutive synthesis of interleukin-3 by leukaemia cell line WEHI-3B is due to retroviral insertion near the gene. Nature 317, 255â258 (1985). https://doi.org/10.1038/317255a0
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DOI: https://doi.org/10.1038/317255a0