研究揭示脂肪酸氧化對肥胖相關乳腺癌的影響
作者:
小柯機器人發布時間:2019/11/22 20:42:43
美國希望之城綜合癌症中心Hua Yu、Saul Priceman、Chunyan Zhang等研究人員合作發現,STAT3激活誘導的CD8陽性T效應細胞脂肪酸氧化對肥胖促進的乳腺癌生長至關重要。 2019年11月21日,國際知名學術期刊《細胞—代謝》在線發表了這一成果
研究人員發現,由CD8陽性T效應細胞中激活的STAT3驅動的脂肪酸氧化(FAO)增加對於肥胖相關的乳腺癌進展至關重要。自發性乳腺癌的肥胖小鼠中的T細胞Stat敲除或用FAO抑制劑治療會降低FAO,增加糖酵解和CD8陽性T效應細胞功能,從而抑制乳腺癌的發展。
此外,CD8陽性T細胞中的PD-1結合可激活STAT3以增加FAO,從而抑制CD8陽性T效應細胞的糖酵解和功能。
最後,富含乳腺脂肪細胞和脂肪組織的瘦素通過激活STAT3-FAO和抑制糖酵解,下調CD8陽性T細胞效應子的功能。研究人員發現,由瘦素和PD-1通過STAT3驅動的脂肪酸氧化增加在抑制CD8陽性T效應細胞糖酵解和促進肥胖相關的乳腺癌發生中起關鍵作用。
據了解,儘管已知肥胖對於癌症的發展至關重要,但是肥胖如何負面影響抗腫瘤免疫反應仍然未知。
附:英文原文
Title: STAT3 Activation-Induced Fatty Acid Oxidation in CD8+ T Effector Cells Is Critical for Obesity-Promoted Breast Tumor Growth
Author: Chunyan Zhang, Chanyu Yue, Andreas Herrmann, Jieun Song, Colt Egelston, Tianyi Wang, Zhifang Zhang, Wenzhao Li, Heehyoung Lee, Maryam Aftabizadeh, Yi Jia Li, Peter P. Lee, Stephen Forman, George Somlo, Peiguo Chu, Laura Kruper, Joanne Mortimer, Dave S.B. Hoon, Wendong Huang, Saul Priceman, Hua Yu
Issue&Volume: November 21, 2019
Abstract: Although obesity is known to be critical for cancer development, how obesity negativelyimpacts antitumor immune responses remains largely unknown. Here, we show that increasedfatty acid oxidation (FAO) driven by activated STAT3 in CD8+ T effector cells is critical for obesity-associated breast tumor progression. AblatingT cell Stat3 or treatment with an FAO inhibitor in obese mice spontaneously developing breasttumor reduces FAO, increases glycolysis and CD8+ T effector cell functions, leading to inhibition of breast tumor development. Moreover,PD-1 ligation in CD8+ T cells activates STAT3 to increase FAO, inhibiting CD8+ T effector cell glycolysis and functions. Finally, leptin enriched in mammary adipocytesand fat tissues downregulates CD8+ T cell effector functions through activating STAT3-FAO and inhibiting glycolysis.We identify a critical role of increased oxidation of fatty acids driven by leptinand PD-1 through STAT3 in inhibiting CD8+ T effector cell glycolysis and in promoting obesity-associated breast tumorigenesis.
DOI: 10.1016/j.cmet.2019.10.013
Source: https://www.cell.com/cell-metabolism/fulltext/S1550-4131(19)30604-7