Loss of Fgfr1 in chondrocytes inhibits osteoarthritis by promoting autophagic activity in temporomandibular joint

Loss of Fgfr1 in chondrocytes inhibits osteoarthritis by promoting autophagic activity in temporomandibular joint
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软骨细胞中 Fgfr1 的缺失通过促进颞下颌关节的自噬活性来抑制骨关节炎

DOI:
10.1074/jbc.ra118.002293
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发表时间:
2018-04
影响因子:
4.8
通讯作者:
Chen Lin
Chen Lin
中科院分区:
生物学2区
文献类型:
--
作者:
Wang Zuqiang;Huang Junlan;Zhou Siru;Luo Fengtao;Tan Qiaoyan;Sun Xi;ing;Ni Zhenhong;Chen Hangang;Du Xiaolan;Xie Yangli;Chen Lin

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颞下颌关节骨关节炎(TMJ OA)是一种常见的退行性疾病,临床上缺乏有效的疾病缓解治疗方法。成纤维细胞生长因子 (FGF) 信号传导与关节软骨稳态有关,但 FGFR1 在 TMJ OA 中的功能作用仍然很大程度上未知。在这项研究中,我们报道了在年龄相关的自发性 OA 模型和异常牙咬合 OA 模型中,TMJ 软骨细胞中 Fgfr1 的缺失延迟了 TMJ OA 的进展。免疫组织化学染色显示,在两种 TMJ OA 模型中,Fgfr1 缺陷会降低 MMP13(基质金属蛋白酶-13)、ADAMTS5(一种具有血小板反应蛋白基序 5 的解整合素和金属蛋白酶)和 COL10A1 的表达,但会增加聚集蛋白聚糖的表达水平。此外,我们的数据表明 FGFR1 信号传导失活可能会促进 TMJ 中的自噬活性。 FGFR1 抑制剂降低了 IL-1β 刺激的髁突软骨细胞中 Mmp13、Adamts5 和 Runx2 的表达,而自噬抑制剂消除了 FGFR1 抑制剂的保护作用。因此,我们的研究表明失活的 FGFR1 信号传导可部分通过促进自噬活性来改善 TMJ OA 进展。操纵这种信号传导可能是改变 TMJ OA 的潜在治疗方法。
Temporomandibular joint osteoarthritis (TMJ OA) is a common degenerative disease with few effective disease-modifying treatments in the clinic. Fibroblast growth factor (FGF) signaling is implicated in articular cartilage homeostasis, but the functional roles of FGFR1 in TMJ OA remain largely unknown. In this study, we report that deletion of Fgfr1 in TMJ chondrocytes delayed TMJ OA progression in the age-associated spontaneous OA model and the abnormal dental occlusion OA model. Immunohistochemical staining revealed that Fgfr1 deficiency decreased the expressions of MMP13 (matrix metalloproteinase-13), ADAMTS5 (a disintegrin and metalloproteinase with thrombospondin motifs 5), and COL10A1 but increased aggrecan expression level in two TMJ OA models. Furthermore, our data show that inactivation of FGFR1 signaling may promote autophagic activity in TMJ. FGFR1 inhibitor decreased the expressions of Mmp13, Adamts5, and Runx2 in IL-1β–stimulated condylar chondrocytes, whereas autophagy inhibitors abrogated the protective effects of the FGFR1 inhibitor. Thus, our study indicates inactivated FGFR1 signaling ameliorates TMJ OA progression partially by promoting autophagic activity. Manipulation of this signaling may be a potential therapeutic approach to modify TMJ OA.
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