TGF-β 和 RAS 共同揭示启动子增强子以驱动转移。
TGF-β and RAS jointly unmask primed enhancers to drive metastasis.
机构信息
Cancer Biology and Genetics Program, Sloan Kettering Institute, Memorial Sloan Kettering Cancer Center, New York, NY 10065, USA.
Cancer Biology and Genetics Program, Sloan Kettering Institute, Memorial Sloan Kettering Cancer Center, New York, NY 10065, USA; Department of Biology, Massachusetts Institute of Technology, Cambridge, MA 02142, USA.
出版信息
Cell. 2024 Oct 31;187(22):6182-6199.e29. doi: 10.1016/j.cell.2024.08.014. Epub 2024 Sep 6.
Epithelial-to-mesenchymal transitions (EMTs) and extracellular matrix (ECM) remodeling are distinct yet important processes during carcinoma invasion and metastasis. Transforming growth factor β (TGF-β) and RAS, signaling through SMAD and RAS-responsive element-binding protein 1 (RREB1), jointly trigger expression of EMT and fibrogenic factors as two discrete arms of a common transcriptional response in carcinoma cells. Here, we demonstrate that both arms come together to form a program for lung adenocarcinoma metastasis and identify chromatin determinants tying the expression of the constituent genes to TGF-β and RAS inputs. RREB1 localizes to H4K16acK20ac marks in histone H2A.Z-loaded nucleosomes at enhancers in the fibrogenic genes interleukin-11 (IL11), platelet-derived growth factor-B (PDGFB), and hyaluronan synthase 2 (HAS2), as well as the EMT transcription factor SNAI1, priming these enhancers for activation by a SMAD4-INO80 nucleosome remodeling complex in response to TGF-β. These regulatory properties segregate the fibrogenic EMT program from RAS-independent TGF-β gene responses and illuminate the operation and vulnerabilities of a bifunctional program that promotes metastatic outgrowth.
上皮-间充质转化 (EMT) 和细胞外基质 (ECM) 重塑是癌侵袭和转移过程中两个截然不同但又很重要的过程。转化生长因子 β (TGF-β) 和 RAS 通过 SMAD 和 RAS 反应元件结合蛋白 1 (RREB1) 信号转导,共同触发 EMT 和纤维生成因子的表达,这是癌细胞中共同转录反应的两个离散分支。在这里,我们证明这两个分支共同形成了肺腺癌转移的程序,并确定了染色质决定因素,将组成基因的表达与 TGF-β 和 RAS 输入联系起来。RREB1 定位于富含组蛋白 H2A.Z 的核小体上的 H4K16acK20ac 标记,位于纤维生成基因白细胞介素 11 (IL11)、血小板衍生生长因子-B (PDGFB) 和透明质酸合酶 2 (HAS2) 以及 EMT 转录因子 SNAI1 的增强子中,为 TGF-β 响应 SMAD4-INO80 核小体重塑复合物的激活做好准备。这些调节特性将纤维生成性 EMT 程序与 RAS 独立的 TGF-β 基因反应区分开来,并阐明了促进转移生长的双功能程序的运作和脆弱性。