Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan.
Int J Mol Sci. 2020 Sep 11;21(18):6659. doi: 10.3390/ijms21186659.
Inflammatory disorders are associated with bone destruction; that is, deterioration in bone cell activities are under the control of the innate immune system. Macrophages play a central role in innate immunity by switching their polarized phenotype. A disturbed immune system causes aberrance in the ordered bone matrix microarrangement, which is a dominant determinant of bone tissue functionalization. However, the precise relationship between the immune system and bone tissue organization is unknown. In this study, the controlled co-culture assay results showed that M1-polarized macrophages disrupted the osteoblast alignment, which directly modulate the oriented bone matrix organization, by secreting pro-inflammatory cytokines. Notably, interleukin-6 was found to be a key regulator of unidirectional osteoblast alignment. Our results demonstrated that inflammatory diseases triggered bone dysfunction by regulating the molecular interaction between the immune system and bone tissue organization. These findings may contribute to the development of therapeutic targets for inflammatory disorders, including rheumatoid arthritis.
炎症性疾病与骨破坏有关;也就是说,骨细胞活动的恶化受固有免疫系统的控制。巨噬细胞通过改变其极化表型在固有免疫中发挥核心作用。免疫系统紊乱会导致有序的骨基质微阵列排列失常,这是骨组织功能化的主要决定因素。然而,免疫系统和骨组织之间的确切关系尚不清楚。在这项研究中,受控共培养分析结果表明,M1 极化的巨噬细胞通过分泌促炎细胞因子破坏成骨细胞的排列,从而直接调节定向骨基质组织。值得注意的是,白细胞介素-6 被发现是成骨细胞定向排列的关键调节因子。我们的研究结果表明,炎症性疾病通过调节免疫系统和骨组织之间的分子相互作用来引发骨功能障碍。这些发现可能有助于为包括类风湿性关节炎在内的炎症性疾病开发治疗靶点。