Sakaguchi Masakiyo, Kinoshita Rie, Putranto Endy Widya, Ruma I Made Winarsa, Sumardika I Wayan, Youyi Chen, Tomonobu Naoko, Yamamoto Ken-Ichi, Murata Hitoshi
Department of Cell Biology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama 700-8558,
Acta Med Okayama. 2017 Dec;71(6):459-465. doi: 10.18926/AMO/55582.
The receptor for advanced glycation end products (RAGE) is involved in inflammatory pathogenesis. It functions as a receptor to multiple ligands such as AGEs, HMGB1 and S100 proteins, activating multiple intracellular signaling pathways with each ligand binding. The molecular events by which ligand-activated RAGE controls diverse signaling are not well understood, but some progress was made recently. Accumulating evidence revealed that RAGE has multiple binding partners within the cytoplasm and on the plasma membrane. It was first pointed out in 2008 that RAGE's cytoplasmic tail is able to recruit Diaphanous-1 (Dia-1), resulting in the acquisition of increased cellular motility through Rac1/Cdc42 activation. We also observed that within the cytosol, RAGE's cytoplasmic tail behaves similarly to a Toll-like receptor (TLR4)-TIR domain, interacting with TIRAP and MyD88 adaptor molecules that in turn activate multiple downstream signals. Subsequent studies demonstrated the presence of an alternative adaptor molecule, DAP10, on the plasma membrane. The coupling of RAGE with DAP10 is critical for enhancing the RAGE-mediated survival signal. Interestingly, RAGE interaction on the membrane was not restricted to DAP10 alone. The chemotactic G-protein-coupled receptors (GPCRs) formyl peptide receptors1 and 2 (FPR1 and FPR2) also interacted with RAGE on the plasma membrane. Binding interaction between leukotriene B4 receptor 1 (BLT1) and RAGE was also demonstrated. All of the interactions affected the RAGE signal polarity. These findings indicate that functional interactions between RAGE and various molecules within the cytoplasmic area or on the membrane area coordinately regulate multiple ligand-mediated RAGE responses, leading to typical cellular phenotypes in several pathological settings. Here we review RAGE's signaling diversity, to contribute to the understanding of the elaborate functions of RAGE in physiological and pathological contexts.
晚期糖基化终末产物受体(RAGE)参与炎症发病机制。它作为多种配体的受体,如晚期糖基化终末产物(AGEs)、高迁移率族蛋白B1(HMGB1)和S100蛋白,每种配体结合后都会激活多个细胞内信号通路。配体激活的RAGE控制多种信号传导的分子事件尚未完全清楚,但最近取得了一些进展。越来越多的证据表明,RAGE在细胞质和质膜内有多个结合伙伴。2008年首次指出,RAGE的细胞质尾巴能够募集透明质酸酶-1(Dia-1),通过激活Rac1/Cdc42导致细胞运动性增加。我们还观察到,在细胞质中,RAGE的细胞质尾巴的行为类似于Toll样受体(TLR4)-TIR结构域,与TIRAP和MyD88衔接分子相互作用,进而激活多个下游信号。随后的研究表明,质膜上存在另一种衔接分子DAP10。RAGE与DAP10的偶联对于增强RAGE介导的生存信号至关重要。有趣的是,RAGE在膜上的相互作用并不局限于单独的DAP10。趋化性G蛋白偶联受体(GPCRs)甲酰肽受体1和2(FPR1和FPR2)也在质膜上与RAGE相互作用。白三烯B4受体1(BLT1)与RAGE之间的结合相互作用也得到了证实。所有这些相互作用都影响了RAGE信号的极性。这些发现表明,RAGE与细胞质区域或膜区域内的各种分子之间的功能相互作用协调调节多种配体介导的RAGE反应,在几种病理情况下导致典型的细胞表型。在此,我们综述RAGE的信号多样性,以有助于理解RAGE在生理和病理背景下的精细功能。