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在实验性牙周炎中,趋化因子 CCL3、CCL4 和 CCL5 及其受体 CCR1+和 CCR5+在 RANKL+细胞迁移中的协同作用的证据。

Evidences of the cooperative role of the chemokines CCL3, CCL4 and CCL5 and its receptors CCR1+ and CCR5+ in RANKL+ cell migration throughout experimental periodontitis in mice.

机构信息

Department of Biological Sciences, School of Dentistry of Bauru, São Paulo University, FOB/USP, Al. Octávio Pinheiro Brisola, 9-75-CEP 17012-901, Bauru, SP, Brazil.

出版信息

Bone. 2010 Apr;46(4):1122-30. doi: 10.1016/j.bone.2009.12.030. Epub 2010 Jan 4.

Abstract

Periodontal disease (PD) is characterized by the inflammatory bone resorption in response to the bacterial challenge, in a host response that involves a series of chemokines supposed to control cell influx into periodontal tissues and determine disease outcome. In this study, we investigated the role of chemokines and its receptors in the immunoregulation of experimental PD in mice. Aggregatibacter actinomycetemcomitans-infected C57Bl/6 (WT) mice developed an intense inflammatory reaction and severe alveolar bone resorption, associated with a high expression of CCL3 and the migration of CCR5+, CCR1+ and RANKL+ cells to periodontal tissues. However, CCL3KO-infected mice developed a similar disease phenotype than WT strain, characterized by the similar expression of cytokines (TNF-alpha, IFN-gamma and IL-10), osteoclastogenic factors (RANKL and OPG) and MMPs (MMP-1, MMP-2, MMP-3, TIMP-1 and TIMP-3), and similar patterns of CCR1+, CCR5+ and RANKL+ cell migration. The apparent lack of function for CCL3 is possible due the relative redundancy of chemokine system, since chemokines such as CCL4 and CCL5, which share the receptors CCR1 and CCR5 with CCL3, present a similar kinetics of expression than CCL3. Accordingly, CCL4 and CCL5 kinetics of expression after experimental periodontal infection remain unaltered regardless the presence/absence of CCL3. Conversely, the individual absence of CCR1 and CCR5 resulted in a decrease of leukocyte infiltration and alveolar bone loss. When CCR1 and CCR5 were simultaneously inhibited by met-RANTES treatment a significantly more effective attenuation of periodontitis progression was verified, associated with lower values of bone loss and decreased counts of leukocytes in periodontal tissues. Our results suggest that the absence of CCL3 does not affect the development of experimental PD in mice, probably due to the presence of homologous chemokines CCL4 and CCL5 that overcome the absence of this chemokine. In addition, our data demonstrate that the absence of chemokine receptors CCR1+ and CCR5+ attenuate of inflammatory bone resorption. Finally, our data shows data the simultaneous blockade of CCR1 and CCR5 with MetRANTEs presents a more pronounced effect in the arrest of disease progression, demonstrating the cooperative role of such receptors in the inflammatory bone resorption process throughout experimental PD.

摘要

牙周病(PD)的特征是在宿主反应中,由于细菌的刺激而发生炎症性骨吸收,该宿主反应涉及一系列趋化因子,这些趋化因子应该控制细胞向牙周组织的流入,并决定疾病的结局。在这项研究中,我们研究了趋化因子及其受体在实验性 PD 中的免疫调节作用。牙龈卟啉单胞菌感染 C57Bl/6(WT)小鼠会发生强烈的炎症反应和严重的牙槽骨吸收,与 CCL3 的高表达以及 CCR5+、CCR1+和 RANKL+细胞向牙周组织的迁移有关。然而,CCL3KO 感染的小鼠表现出与 WT 菌株相似的疾病表型,其特征是细胞因子(TNF-α、IFN-γ和 IL-10)、破骨细胞生成因子(RANKL 和 OPG)和 MMPs(MMP-1、MMP-2、MMP-3、TIMP-1 和 TIMP-3)的表达相似,以及 CCR1+、CCR5+和 RANKL+细胞迁移的模式相似。CCL3 可能由于趋化因子系统的相对冗余而缺乏功能,因为趋化因子(如 CCL4 和 CCL5)与 CCL3 共享受体 CCR1 和 CCR5,其表达动力学与 CCL3 相似。因此,实验性牙周感染后 CCL4 和 CCL5 的表达动力学保持不变,无论是否存在 CCL3。相反,CCR1 和 CCR5 的单独缺失会导致白细胞浸润和牙槽骨丢失减少。当 CCR1 和 CCR5 同时被 met-RANTES 抑制时,牙周炎进展的抑制作用明显增强,与骨丢失值降低和牙周组织中白细胞计数减少有关。我们的结果表明,CCL3 的缺失不会影响实验性 PD 在小鼠中的发展,这可能是由于同源趋化因子 CCL4 和 CCL5 的存在,它们克服了这种趋化因子的缺失。此外,我们的数据表明,趋化因子受体 CCR1+和 CCR5+的缺失可减轻炎症性骨吸收。最后,我们的数据表明,同时用 MetRANTEs 阻断 CCR1 和 CCR5 在疾病进展的阻滞中具有更显著的作用,表明这些受体在整个实验性 PD 中的炎症性骨吸收过程中具有协同作用。

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