Hallberg B, Schmidt J, Luz A, Pedersen F S, Grundström T
Department of Applied Cell and Molecular Biology, University of Umeå, Sweden.
J Virol. 1991 Aug;65(8):4177-81. doi: 10.1128/JVI.65.8.4177-4181.1991.
The transcriptional enhancers of retroviruses that lack an oncogene are important determinants of their oncogenicity. However, no specific cellular transcriptional activator has yet been found to determine the oncogenicity for any of these viruses. The SL3-3 enhancer factor 1 (SEF1) cellular transcriptional activators are expressed preferentially in T lymphocytes. In the SL3-3 murine leukemia virus enhancer, two different sequences can bind SEF1 activators. We show that mutation of the SEF1 binding sites disrupts the disease potential of SL3-3 murine leukemia virus, implying that SEF1 transcriptional activators are required for tumor induction by SL3-3. The SEF1 site mutations did not appear to affect the pathogenicity of SL3-3 by impairment of virus multiplication, but rather by a specific defect in the ability of neoplastic transformation.
缺乏癌基因的逆转录病毒的转录增强子是其致癌性的重要决定因素。然而,尚未发现任何特定的细胞转录激活因子能决定这些病毒中任何一种的致癌性。SL3-3增强子因子1(SEF1)细胞转录激活因子在T淋巴细胞中优先表达。在SL3-3鼠白血病病毒增强子中,两个不同的序列可结合SEF1激活因子。我们发现,SEF1结合位点的突变会破坏SL3-3鼠白血病病毒的致病潜力,这意味着SEF1转录激活因子是SL3-3诱导肿瘤所必需的。SEF1位点突变似乎不是通过损害病毒增殖来影响SL3-3的致病性,而是通过肿瘤转化能力的特定缺陷来影响。