Baldassarre G, Fedele M, Battista S, Vecchione A, Klein-Szanto A J, Santoro M, Waldmann T A, Azimi N, Croce C M, Fusco A
Kimmel Cancer Center, Jefferson Medical College, Philadelphia, PA 19107, USA.
Proc Natl Acad Sci U S A. 2001 Jul 3;98(14):7970-5. doi: 10.1073/pnas.141224998. Epub 2001 Jun 26.
Rearrangements of the high mobility group protein I-C (HMGI-C) gene, consisting in the loss of the carboxyl-terminal tail, have been frequently detected in benign human tumors of mesenchymal origin. We have previously demonstrated that transgenic (TG) mice carrying a truncated HMGI-C construct (HMGI-C/T) exhibit a giant phenotype together with a predominantly abdominal/pelvic lipomatosis. Here, we report that HMGI-C/T TG mice develop natural killer (NK)-T/NK cell lymphomas starting from 12 months of age. We found an increased expression of IL-2 and IL-15 proteins and their receptors in these lymphomas, and we demonstrate that HMGI-C/T protein positively regulates their expression in vitro. Therefore, the HMGI-C/T-mediated chronic stimulation of the IL-2/IL-15 pathway could be responsible for the onset of NK-T/NK cell lymphomas in HMGI-C/T TG mice.
高迁移率族蛋白I-C(HMGI-C)基因重排,表现为羧基末端尾巴缺失,在人类间充质来源的良性肿瘤中经常被检测到。我们之前已经证明,携带截短型HMGI-C构建体(HMGI-C/T)的转基因(TG)小鼠表现出巨大体型以及主要为腹部/盆腔脂肪瘤病。在此,我们报告HMGI-C/T TG小鼠从12月龄开始发生自然杀伤(NK)-T/NK细胞淋巴瘤。我们发现这些淋巴瘤中白细胞介素-2(IL-2)和白细胞介素-15(IL-15)蛋白及其受体的表达增加,并且我们证明HMGI-C/T蛋白在体外正向调节它们的表达。因此,HMGI-C/T介导的IL-2/IL-15通路的慢性刺激可能是HMGI-C/T TG小鼠中NK-T/NK细胞淋巴瘤发病的原因。