LEFTY1是一種SMAD雙重抑制因子
作者:
小柯機器人發布時間:2020/7/22 23:00:42
美國史丹福大學Michael F. Clarke小組的一項最新工作發現,LEFTY1是SMAD雙重抑制因子,可促進乳祖細胞生長和腫瘤發生。相關論文於2020年7月20日在線發表在《細胞—幹細胞》雜誌上。
研究人員證明LEFTY1是NODAL/SMAD2信號的分泌抑制因子。BMP7是一種具有環境相關功能的NODAL拮抗劑,由基底細胞產生並抑制祖細胞增殖,它可以抑制SMAD2和SMAD5信號傳導從而促進正常和惡性乳腺上皮細胞的長期增殖。
在正常小鼠的上皮中,LEFTY1在腔細胞和稀有基底細胞中與BMP7對立表達,從而促進導管分支;LEFTY1與BMPR2結合,來抑制BMP7誘導的SMAD5激活,而這種LEFTY1-BMPR2相互作用在三陰性乳腺癌異種移植物中對腫瘤起始細胞是特異的,因為其依賴於LEFTY1來生長。這些結果表明,LEFTY1是內源性SMAD雙重抑制因子,而抑制其功能可能是乳腺癌治療的靶點。
據介紹,SMAD途徑控制上皮細胞的增殖,而通過SMAD成員傳遞TGF-β和BMP信號對乳腺發育和體內穩態具有明顯的影響。
附:英文原文
Title: LEFTY1 Is a Dual-SMAD Inhibitor that Promotes Mammary Progenitor Growth and Tumorigenesis
Author: Maider Zabala, Neethan A. Lobo, Jane Antony, Luuk S. Heitink, Gunsagar S. Gulati, Jessica Lam, Natesh Parashurama, Kassandra Sanchez, Maddalena Adorno, Shaheen S. Sikandar, Angera H. Kuo, Dalong Qian, Tomer Kalisky, Sopheak Sim, Linus Li, Frederick M. Dirbas, George Somlo, Aaron Newman, Stephen R. Quake, Michael F. Clarke
Issue&Volume: 2020-07-20
Abstract: SMAD pathways govern epithelial proliferation, and transforming growth factor β (TGF-βand BMP signaling through SMAD members has distinct effects on mammary developmentand homeostasis. Here, we show that LEFTY1, a secreted inhibitor of NODAL/SMAD2 signaling,is produced by mammary progenitor cells and, concomitantly, suppresses SMAD2 and SMAD5signaling to promote long-term proliferation of normal and malignant mammary epithelialcells. In contrast, BMP7, a NODAL antagonist with context-dependent functions, isproduced by basal cells and restrains progenitor cell proliferation. In normal mouseepithelium, LEFTY1 expression in a subset of luminal cells and rare basal cells opposesBMP7 to promote ductal branching. LEFTY1 binds BMPR2 to suppress BMP7-induced activationof SMAD5, and this LEFTY1-BMPR2 interaction is specific to tumor-initiating cellsin triple-negative breast cancer xenografts that rely on LEFTY1 for growth. Theseresults suggest that LEFTY1 is an endogenous dual-SMAD inhibitor and that suppressingits function may represent a therapeutic vulnerability in breast cancer.
DOI: 10.1016/j.stem.2020.06.017
Source: https://www.cell.com/cell-stem-cell/fulltext/S1934-5909(20)30284-8