目的研究柯伊利素对痛风性关节炎小鼠的治疗作用及其免疫机制。方法18只C57BL/6小鼠随机分为假手术(sham)组、模型(model)组及柯伊利素治疗组,每组6只,采用微晶尿酸钠(MSU)注射小鼠后肢踝关节造模成痛风性关节炎小鼠模型;每日给予柯伊利...目的研究柯伊利素对痛风性关节炎小鼠的治疗作用及其免疫机制。方法18只C57BL/6小鼠随机分为假手术(sham)组、模型(model)组及柯伊利素治疗组,每组6只,采用微晶尿酸钠(MSU)注射小鼠后肢踝关节造模成痛风性关节炎小鼠模型;每日给予柯伊利素200 mg/kg注射治疗7 d。观察关节肿胀程度,记录后肢功能障碍指数;HE染色观察关节滑膜组织病理变化;ELISA检测血清中尿素(uric acid,UA)含量及关节组织液中IL-1β、IL-6、IL-10、IL-18和TNF-α等炎症因子的水平;qRTPCR和Western blotting分别检测NF-κB、NLR家族热蛋白结构域包含蛋白3(NLR family pyrin domain containing 3,NLPR3)、凋亡相关斑点样蛋白(apoptosis-associated speck-like protein containing a CARD,ASC)和Caspase-1的mRNA和蛋白水平;流式细胞术检测组织液中Th17和Treg细胞数量。结果与模型组相比,柯伊利素有效降低了小鼠关节肿胀程度和后肢关节障碍指数,改善了关节滑膜液组织病理恶化;血清中UA含量下降,关节液中的炎症因子如IL-1β、IL-6、IL-18和TNF-α等含量明显减少,IL-10含量增加;另外,qRT-PCR结果显示,NF-κB、NLPR3、ASC和Caspase-1的mRNA表达水平下降,且NLPR3、ASC和Caspase-1的蛋白表达趋势与mRNA表达趋势一致;流式细胞术检测发现,Th17细胞频率和Th17/Treg与模型组比较均下降,而Treg细胞频率升高。结论柯伊利素能有效缓解小鼠痛风性关节炎的症状,可能是通过影响NF-κB-NLRP3信号通路,调控炎性相关细胞子的表达,并通过改善Th17/Treg平衡减轻组织局部的炎症。展开更多
The aim of this study is to explore potential pathogenicity of Mycoplasma penetrans, and to investigate whether M. penetrans lipid-associated membrane proteins （LAMPs） could induce human monocytic cell line （THP- 1...The aim of this study is to explore potential pathogenicity of Mycoplasma penetrans, and to investigate whether M. penetrans lipid-associated membrane proteins （LAMPs） could induce human monocytic cell line （THP- 1 ） to produce some proinflammatory cytokines in vitro, including interleukin- 1β （ IL- 1β）, tumor necrosis factor alpha （TNF-α）, and IL-8. THP-1 was stimulated with different concentrations of M.penetrans LAMPs and at different time to analyze the production of human IL-1β, TNF-α and IL-8. The protein levels of human IL-1β, TNF-α and IL-8 were measured by enzyme-linked immunoadsorbent assay （ELISA） and the mRNA levels of these proinflammatory cytokines were detected by reverse transcriptase-PCR （RT-PCR）. It was demonstrated in the present study that the production of IL-1β, TNF-α and IL-8 increased in dose- and time-dependent manner after stimulation with M. penetrans LAMPs in THP-1 cells. M. penetrans LAMPs also induced the expression of IL-1β, TNF-α and IL-8 mRNA. The production of IL-1β, TNF-α and IL-8 and the expression of mRNA were down-regulated by pyrrolidine dithiocarbamate （PDTC）. This study demonstrated that M. penetrans LAMPs can induce the production of proinflammatory cytokines in human monocytic cells in vitro, thus suggesting that it may be an important etiological factor.展开更多
The gut microbiota plays a key role in obesity and related metabolic disorders, and multiple factors including diet, host genotype, and age regulate it. Many studies have examined the contribution of extrinsic factors...The gut microbiota plays a key role in obesity and related metabolic disorders, and multiple factors including diet, host genotype, and age regulate it. Many studies have examined the contribution of extrinsic factors to the regulation of the gut microbiota, but the importance of the host genetic constitution cannot be ignored, lnterleukin 17A （lL-17A）, a pro-inflammatory cytokine, is important in the defense against infection and diseases. Here, we investigated the association among IL-17, a high-fat diet （HFD）, and the gut microbiota. Mice deficient in 1L-17A were resistant to diet-induced obesity and related diseases. Compared with the I1-17a^-/1 mice, wild-type （WT） mice challenged with HFD showed obvious weight fluctuations, such as those seen in type 2 diabetes, and hematological changes similar to those associated with metabolic syndrome. However, housing WT mice and Il-17a^-/- mice together signifi- cantly alleviated these symptoms in the WT mice. A metagenomic analysis of the mouse feces indicated that the microbial community compositions of these two groups differed before HFD feeding. The HFD mediated shifts in the gut microbial compositions, which were associated with the mouse phenotypes. We also identified potentially beneficial and harmful species present during this period, and drew net- works of the most abundant species. A functional analysis indicated pathway changes in the WT and I1-17a^- /- mice when fed the HFD. Collectively, these data underscore the importance of the host factor IL-17A in shaping and regulating the gut microbiota, which conversely, influences the host health.展开更多
文摘目的研究柯伊利素对痛风性关节炎小鼠的治疗作用及其免疫机制。方法18只C57BL/6小鼠随机分为假手术(sham)组、模型(model)组及柯伊利素治疗组,每组6只,采用微晶尿酸钠(MSU)注射小鼠后肢踝关节造模成痛风性关节炎小鼠模型;每日给予柯伊利素200 mg/kg注射治疗7 d。观察关节肿胀程度,记录后肢功能障碍指数;HE染色观察关节滑膜组织病理变化;ELISA检测血清中尿素(uric acid,UA)含量及关节组织液中IL-1β、IL-6、IL-10、IL-18和TNF-α等炎症因子的水平;qRTPCR和Western blotting分别检测NF-κB、NLR家族热蛋白结构域包含蛋白3(NLR family pyrin domain containing 3,NLPR3)、凋亡相关斑点样蛋白(apoptosis-associated speck-like protein containing a CARD,ASC)和Caspase-1的mRNA和蛋白水平;流式细胞术检测组织液中Th17和Treg细胞数量。结果与模型组相比,柯伊利素有效降低了小鼠关节肿胀程度和后肢关节障碍指数,改善了关节滑膜液组织病理恶化;血清中UA含量下降,关节液中的炎症因子如IL-1β、IL-6、IL-18和TNF-α等含量明显减少,IL-10含量增加;另外,qRT-PCR结果显示,NF-κB、NLPR3、ASC和Caspase-1的mRNA表达水平下降,且NLPR3、ASC和Caspase-1的蛋白表达趋势与mRNA表达趋势一致;流式细胞术检测发现,Th17细胞频率和Th17/Treg与模型组比较均下降,而Treg细胞频率升高。结论柯伊利素能有效缓解小鼠痛风性关节炎的症状,可能是通过影响NF-κB-NLRP3信号通路,调控炎性相关细胞子的表达,并通过改善Th17/Treg平衡减轻组织局部的炎症。
基金This study is supported by Natural Science Foundation of Hunan Province （No. 06JJ5044） a Grant from Hunan Province Department of Health （No. B2005-089）.
文摘The aim of this study is to explore potential pathogenicity of Mycoplasma penetrans, and to investigate whether M. penetrans lipid-associated membrane proteins （LAMPs） could induce human monocytic cell line （THP- 1 ） to produce some proinflammatory cytokines in vitro, including interleukin- 1β （ IL- 1β）, tumor necrosis factor alpha （TNF-α）, and IL-8. THP-1 was stimulated with different concentrations of M.penetrans LAMPs and at different time to analyze the production of human IL-1β, TNF-α and IL-8. The protein levels of human IL-1β, TNF-α and IL-8 were measured by enzyme-linked immunoadsorbent assay （ELISA） and the mRNA levels of these proinflammatory cytokines were detected by reverse transcriptase-PCR （RT-PCR）. It was demonstrated in the present study that the production of IL-1β, TNF-α and IL-8 increased in dose- and time-dependent manner after stimulation with M. penetrans LAMPs in THP-1 cells. M. penetrans LAMPs also induced the expression of IL-1β, TNF-α and IL-8 mRNA. The production of IL-1β, TNF-α and IL-8 and the expression of mRNA were down-regulated by pyrrolidine dithiocarbamate （PDTC）. This study demonstrated that M. penetrans LAMPs can induce the production of proinflammatory cytokines in human monocytic cells in vitro, thus suggesting that it may be an important etiological factor.
基金supported by the National High Technology Research and Development Program (2015AA020702)
文摘The gut microbiota plays a key role in obesity and related metabolic disorders, and multiple factors including diet, host genotype, and age regulate it. Many studies have examined the contribution of extrinsic factors to the regulation of the gut microbiota, but the importance of the host genetic constitution cannot be ignored, lnterleukin 17A （lL-17A）, a pro-inflammatory cytokine, is important in the defense against infection and diseases. Here, we investigated the association among IL-17, a high-fat diet （HFD）, and the gut microbiota. Mice deficient in 1L-17A were resistant to diet-induced obesity and related diseases. Compared with the I1-17a^-/1 mice, wild-type （WT） mice challenged with HFD showed obvious weight fluctuations, such as those seen in type 2 diabetes, and hematological changes similar to those associated with metabolic syndrome. However, housing WT mice and Il-17a^-/- mice together signifi- cantly alleviated these symptoms in the WT mice. A metagenomic analysis of the mouse feces indicated that the microbial community compositions of these two groups differed before HFD feeding. The HFD mediated shifts in the gut microbial compositions, which were associated with the mouse phenotypes. We also identified potentially beneficial and harmful species present during this period, and drew net- works of the most abundant species. A functional analysis indicated pathway changes in the WT and I1-17a^- /- mice when fed the HFD. Collectively, these data underscore the importance of the host factor IL-17A in shaping and regulating the gut microbiota, which conversely, influences the host health.
