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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Infection with human T-lymphotropic viruses leads to constitutive expression of leukemia inhibitory factor and interleukin-6.

Leukemia inhibitory factor (LIF), similar to interleukin-6 (IL-6), is a glycoprotein growth factor and differentiation regulator that has pleiotropic activity in several cellular systems. Recent reports of constitutive IL-6 production from spontaneously proliferating cells from human T-cell leukemia virus (HTLV)-infected individuals led us to examine the expression of IL-6 and LIF during HTLV infection. In vitro infection of peripheral blood lymphocytes with HTLV-I was associated with production of both soluble LIF and IL-6 in conjunction with the increasing HTLV antigen concentration. Northern blot analysis of T-cell lines generated from individuals infected with HTLV-I (MT-2, HuT-102, FS, EG, SP) and HTLV-II (Mo-T, H2A, H2E) demonstrated a marked increase in constitutive expression of LIF and IL-6 transcripts, as compared with uninfected cell lines (HuT-78, Jurkat). The constitutive expression of LIF and IL-6 was independent of presence of IL-2 in the culture medium, as both IL-2-independent (MT-2, HuT-102, SP, Mo-T) and IL-2-dependent (FS, EG, H2A, H2E) cell lines expressed LIF and IL-6 transcripts. Furthermore, LIF and IL-6 RNA expression in an HTLV-I-infected cell line (MT-2) was enhanced by phorbol ester stimulation via mechanisms that appear to be dependent on the posttranscriptional regulatory controls. These results show that both LIF and IL-6 are produced by HTLV-I- and HTLV-II-infected cells, which could potentially alter the transcriptional regulation of HTLV gene expression by inducing certain early response genes.[1]


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