当前位置:首页>南京>IF:4.8 智能生信赋能多组学!南京大学团队揭秘肠道菌群介导类风湿关节炎的牙周损伤机制

IF:4.8 智能生信赋能多组学!南京大学团队揭秘肠道菌群介导类风湿关节炎的牙周损伤机制

  • 2026-06-24 10:20:48
IF:4.8 智能生信赋能多组学!南京大学团队揭秘肠道菌群介导类风湿关节炎的牙周损伤机制

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类风湿关节炎(RA)是全球高发的慢性自身免疫病,80% 发病于 35-50 岁,女性患病率为男性 4 倍。以侵蚀性多关节炎为核心表现,可致关节畸形与功能丧失,还累及心、肺等脏器。抗 CCP 抗体等为关键诊断指标,但发病机制尚未完全明确。现有治疗可缓解症状,但存在疗效局限、部分患者应答不佳等问题,仍需优化精准治疗方案。

该研究发表于《RMD Open》。研究构建胶原诱导性关节炎、牙周骨缺损大鼠模型,结合 16S 测序、非靶向代谢组学、粪便菌群移植及体外细胞实验开展分析。结果证实,类风湿关节炎会造成肠道菌群失调与代谢紊乱,富集促炎菌群、扰动花生四烯酸等通路,通过激活炎症、抑制成骨,显著阻碍牙周骨修复,明确了菌群 - 免疫 - 代谢轴的关键作用。

文献分享   

中文标题:类风湿关节炎中的肠道菌群失调与代谢改变:牙周修复的障碍

发表RMD Open

发表时间:2026年5月

影响因子:4.8

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专业生信分析

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研究背景   

类风湿关节炎(RA)与牙周炎密切相关,既往研究多聚焦牙周炎对 RA 的影响,但 RA 如何作用于牙周组织修复尚不明确。肠道菌群参与全身免疫调控,且 RA 常伴随肠道菌群失调。本研究构建大鼠模型,结合多组学技术与粪便菌群移植(FMT),探究 RA 引发的肠道菌群、代谢紊乱对牙周骨修复的阻碍作用,解析背后分子机制。

研究方法   

1.动物模型构建:采用 6 周龄雄性 SD 大鼠,分为空白组(CON)、胶原诱导性关节炎组(CIA)、牙周骨缺损组(PBD)、联合模型组(CIA+PBD),分别干预 1、3、6 周;另构建伪无菌大鼠模型,开展健康 / RA 大鼠粪便菌群移植(FMT)实验。

2.组织学与影像学检测:利用 Micro-CT 分析骨微结构,结合 H&E、Masson、TRAP 染色、免疫组化,评估骨修复、破骨细胞、成骨标志物(Runx2、ALP)及炎症指标。

3.多组学分析:通过 16S rRNA 高通量测序解析肠道菌群多样性与物种组成;采用非靶向 LC-MS 代谢组学,结合 KEGG 等数据库分析差异代谢物及通路。

4.体外实验:提取肠道菌群上清液刺激巨噬细胞,检测促炎因子 TNF-α、IL-1β 表达,验证菌群的免疫调控作用。

5.统计学分析:使用 GraphPad Prism、R 语言等完成组间差异、相关性分析。

    研究结果   

    1

    类风湿关节炎显著抑制牙周骨缺损修复,加剧局部炎症与骨吸收

    Micro-CT 结果(图 1)显示,与单纯牙周骨缺损(PBD)组相比,CIA+PBD 组大鼠牙周骨密度、骨体积分数、骨小梁厚度显著降低,骨小梁间隙增大,各时间点骨修复能力均明显变差。组织染色(图 2)证实,CIA+PBD 组新生骨小梁面积大幅减少,TRAP 染色可见破骨细胞数量显著增多,骨吸收活性亢进。免疫组化(图 3)检测成骨相关指标发现,CIA+PBD 组 HIF-1α、Runx2、ALP 等成骨标志物表达水平持续偏低,成骨分化与骨基质合成受到抑制。以上结果说明,RA 营造的全身炎症环境会同时抑制成骨、激活破骨,从结构和分子层面双重阻碍牙周骨组织的修复再生。

        2

        RA 引发肠道菌群失调与代谢紊乱,关键通路发生显著改变

        RA 患者滑液可提升 FLSs 活性、迁移与侵袭能力,而 DFO 清除铁后该促癌样表型被逆转。体外亚铁离子刺激不诱导 FLSs 死亡,反而提升细胞活力、促进细胞周期进展,同时上调基质蛋白酶、趋化因子与炎症因子表达。人源化滑膜炎小鼠模型显示,铁处理后的 RA-FLSs 对软骨的侵袭、破坏能力大幅增强,不仅直接接触的软骨受损,远端软骨也出现明显破坏。该结果明确铁过载是激活 FLSs 增殖、侵袭能力的重要诱因,FLSs 是铁介导 RA 骨损伤的核心效应细胞。

          3

          移植 RA 大鼠肠道菌群可直接阻碍牙周修复,激活炎症反应

          伪无菌大鼠 FMT 模型验证(图 6)显示,受体大鼠肠道菌群特征与供体高度一致,模型构建成功。Micro-CT 与组织学检测(图 7)发现,移植 RA 菌群的 FCIA 组牙周骨修复远差于移植健康菌群的 FCON 组,骨微结构参数恶化,新生骨组织减少。TRAP、NF-κB、HK2 染色(图 8)结果显示,FCIA 组破骨细胞数量激增,NF-κB 介导的炎症通路、糖酵解通路被显著激活。体外细胞实验进一步证明,RA 大鼠肠道菌群上清液可诱导巨噬细胞高表达 TNF-α、IL-1β 等促炎因子。该结果直接证实,RA 相关肠道菌群是抑制牙周修复的核心因素,可通过激活全身及局部炎症发挥作用。

            文章小结   

            该研究借助大鼠模型、FMT 及多组学技术证实,类风湿关节炎会诱发肠道菌群失调与代谢紊乱,改变菌群结构、扰动花生四烯酸等代谢通路。紊乱的肠道菌群进一步激活炎症反应、抑制成骨、增强骨吸收,最终阻碍牙周骨组织修复。研究阐明了菌群 - 免疫 - 代谢轴在 RA 与牙周损伤中的作用,为合并牙周疾病的 RA 患者提供了全新干预思路。

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            1. CONNECT:[ UseTime:0.000993s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
            2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001428s ]
            3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.013268s ]
            4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.008492s ]
            5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001577s ]
            6. SELECT * FROM `set` [ RunTime:0.000625s ]
            7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001460s ]
            8. SELECT * FROM `article` WHERE `id` = 588211 LIMIT 1 [ RunTime:0.039555s ]
            9. UPDATE `article` SET `lasttime` = 1782459358 WHERE `id` = 588211 [ RunTime:0.007253s ]
            10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.003067s ]
            11. SELECT * FROM `article` WHERE `id` < 588211 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.016268s ]
            12. SELECT * FROM `article` WHERE `id` > 588211 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002841s ]
            13. SELECT * FROM `article` WHERE `id` < 588211 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002366s ]
            14. SELECT * FROM `article` WHERE `id` < 588211 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.031176s ]
            15. SELECT * FROM `article` WHERE `id` < 588211 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001926s ]
            0.323172s