血清澱粉樣蛋白A作為可溶性模式識別受體誘導2型免疫
作者:
小柯機器人發布時間:2020/6/23 15:01:26
血清澱粉樣蛋白A是可誘導2型免疫的可溶性模式識別受體,這一成果由美國約翰霍普金斯大學Marsha Wills-Karp和Ursula Smole研究團隊經過不懈努力而取得。 該研究於2020年6月22號發表於《自然-免疫學》雜誌。
研究人員發現脂肪酸結合蛋白(FABP)家族的蟎蟲第13組過敏原是由在進化保守的急性期蛋白-血清澱粉樣蛋白A1(SAA1)識別的,該蛋白可促進2型肺免疫。從機理上講,SAA1與過敏性蟎蟲FABP直接相互作用(Der p 13和Blo t 13)。蟎蟲FABPs與SAA1之間的相互作用激活了SAA1結合受體-甲醯基肽受體2(FPR2),從而以SAA1依賴性的方式加速促2型細胞因子白介素(IL)-33從上皮釋放。
重要的是,在慢性鼻-鼻竇炎患者的鼻上皮細胞中,SAA1-FPR2-IL-33通路上調。這些發現揭示了在常見蟎蟲過敏原中,SAA1作為已知保守FABP可溶性模式識別受體的不可識別作用,這些抗原在黏膜表面引發2型免疫。
據悉,很大程度上,部分環境蛋白引起過敏反應的分子基礎是未知的。
附:英文原文
Title: Serum amyloid A is a soluble pattern recognition receptor that drives type 2 immunity
Author: Ursula Smole, Naina Gour, Jordan Phelan, Gerhard Hofer, Cordula Khler, Bernhard Kratzer, Peter A. Tauber, Xiao Xiao, Nu Yao, Jan Dvorak, Luis Caraballo, Leonardo Puerta, Sandra Rosskopf, Jamila Chakir, Ernst Malle, Andrew P. Lane, Winfried F. Pickl, Stephane Lajoie, Marsha Wills-Karp
Issue&Volume: 2020-06-22
Abstract: The molecular basis for the propensity of a small number of environmental proteins to provoke allergic responses is largely unknown. Herein, we report that mite group 13 allergens of the fatty acid-binding protein (FABP) family are sensed by an evolutionarily conserved acute-phase protein, serum amyloid A1 (SAA1), that promotes pulmonary type 2 immunity. Mechanistically, SAA1 interacted directly with allergenic mite FABPs (Der p 13 and Blo t 13). The interaction between mite FABPs and SAA1 activated the SAA1-binding receptor, formyl peptide receptor 2 (FPR2), which drove the epithelial release of the type-2-promoting cytokine interleukin (IL)-33 in a SAA1-dependent manner. Importantly, the SAA1–FPR2–IL-33 axis was upregulated in nasal epithelial cells from patients with chronic rhinosinusitis. These findings identify an unrecognized role for SAA1 as a soluble pattern recognition receptor for conserved FABPs found in common mite allergens that initiate type 2 immunity at mucosal surfaces.
DOI: 10.1038/s41590-020-0698-1
Source: https://www.nature.com/articles/s41590-020-0698-1