Kon Shigeyuki, Nakayama Yosuke, Matsumoto Naoki, Ito Koyu, Kanayama Masashi, Kimura Chiemi, Kouro Hitomi, Ashitomi Dai, Matsuda Tadashi, Uede Toshimitsu
Division of Molecular Immunology, Institute for Genetic Medicine, Hokkaido University, Sapporo, Hokkaido, Japan; Department of Immunology, Faculty of Pharmaceutical Sciences, Hokkaido University, Sapporo, Hokkaido, Japan.
Division of Molecular Immunology, Institute for Genetic Medicine, Hokkaido University, Sapporo, Hokkaido, Japan.
PLoS One. 2014 Dec 29;9(12):e116210. doi: 10.1371/journal.pone.0116210. eCollection 2014.
Osteopontin (OPN) is a multifunctional protein that has been linked to various intractable inflammatory diseases. One way by which OPN induces inflammation is the production of various functional fragments by enzyme cleavage. It has been well appreciated that OPN is cleaved by thrombin, and/or matrix metalloproteinase-3 and -7 (MMP-3/7). Although the function of thrombin-cleaved OPN is well characterized, little is known about the function of MMP-3/7-cleaved OPN. In this study, we found a novel motif, LRSKSRSFQVSDEQY, in the C-terminal fragment of MMP-3/7-cleaved mouse OPN binds to α9β1 integrin. Importantly, this novel motif is involved in the development of anti-type II collagen antibody-induced arthritis (CAIA). This study provides the first in vitro and in vivo evidence that OPN cleavage by MMP-3/7 is an important regulatory mechanism for CAIA.
骨桥蛋白(OPN)是一种多功能蛋白质,与多种难治性炎症性疾病有关。OPN诱导炎症的一种方式是通过酶切产生各种功能片段。人们已经充分认识到,OPN可被凝血酶和/或基质金属蛋白酶-3和-7(MMP-3/7)切割。虽然凝血酶切割的OPN的功能已得到充分表征,但关于MMP-3/7切割的OPN的功能却知之甚少。在本研究中,我们在MMP-3/7切割的小鼠OPN的C末端片段中发现了一个新的基序LRSKSRSFQVSDEQY,它与α9β1整合素结合。重要的是,这个新基序参与了抗II型胶原抗体诱导的关节炎(CAIA)的发展。本研究提供了首个体外和体内证据,表明MMP-3/7切割OPN是CAIA的重要调节机制。