Acute pancreatitis is an inflammation of the pancreas that may lead to systemic inflammatory response syndrome and death due to multiple organ failure. Acinar cells, together with leukocytes, trigger the inflammatory ...Acute pancreatitis is an inflammation of the pancreas that may lead to systemic inflammatory response syndrome and death due to multiple organ failure. Acinar cells, together with leukocytes, trigger the inflammatory cascade in response to local damage of the pancreas. Amplification of the inflammatory cascade requires up-regulation of proinflammatory cytokines and this process is mediated not only by nuclear factor κB but also by chromatinmodifying complexes and chromatin remodeling. Among the different families of histone acetyltransferases, the p300/CBP family seems to be particularly associated with the inflammatory process. cAMP activates gene expression via the cAMP-responsive element (CRE) and the transcription factor CRE-binding protein (CREB). CREB can be phosphorylated and activated by different kinases, such as protein kinase A and MAPK, and then it recruits the histone acetyltransferase co-activator CREB-binding protein (CBP) and its homologue p300. The recruitment of CBP/p300 and changes in the level of histone acetylation are required for transcription activation. Transcriptional repression is also a dynamic and essential mechanism of down-regulation of genes for resolution of inflammation, which seems to be mediated mainly by protein phosphatases (PP1, PP2A and MKP1) and histone deacetylases(HDACs) .Class HDACs are key transcriptional regulators whose activities are controlled via phosphorylationdependent nucleo/cytoplasmic shuttling. PP2A is responsible for dephosphorylation of class HDACs, triggeringnuclear localization and repression of target genes, whereas phosphorylation triggers cytoplasmic localization leading to activation of target genes. The potential benefit from treatment with phosphodiesterase inhibitors and histone deacetylase inhibitors is discussed.展开更多
目的:探究双特异性磷酸酶6(Dusp6)对间歇性缺氧(IH)诱导的肺动脉高压(PAH)的影响及其机制。方法:利用基因表达数据库以及体内模型分析Dusp6的差异表达。随后将15只雄性SD大鼠随机分为正常组(Normal组)、慢性间歇缺氧组(CIH组,120 s循环,...目的:探究双特异性磷酸酶6(Dusp6)对间歇性缺氧(IH)诱导的肺动脉高压(PAH)的影响及其机制。方法:利用基因表达数据库以及体内模型分析Dusp6的差异表达。随后将15只雄性SD大鼠随机分为正常组(Normal组)、慢性间歇缺氧组(CIH组,120 s循环,60 s 6%O_(2),60 s 21%O_(2),8 h/d,持续6周)、CIH+Dusp6抑制组(CIH+AAV1. Dusp6组),CIH处理6周后观察各组大鼠右心收缩压以及肺外周小动脉重塑程度。同时,将大鼠肺动脉平滑肌细胞(RPASMCs)分为正常组、间歇缺氧组(IH组,1 h循环,30 min 1%O_(2),30 min 21%O_(2),持续24 h)、间歇缺氧+Dusp6抑制组(IH+Si-Dusp6组),观察各组RPASMCs增殖、线粒体膜电位和线粒体分裂情况。结果:基因表达数据库以及体内模型显示,与正常组相比,IH组Dusp6表达升高。与正常组相比,CIH组大鼠右心收缩压升高,肺外周小动脉明显重塑;而与CIH组相比,CIH+AAV1. Dusp6组大鼠右心收缩压有所下降,肺外周小动脉重塑程度明显减轻。同时,IH能够诱导RPASMCs的增殖、线粒体膜电位降低和线粒体分裂,而抑制Dusp6能够明显减轻IH诱导的RPASMCs增殖、线粒体膜电位的降低和线粒体分裂。另外,Dusp6能够通过调节Drp1/ERK1/2通路而发挥作用。结论:抑制Dusp6表达可能通过Drp1/ERK1/2通路调节线粒体分裂从而抑制CIH诱导的大鼠肺动脉高压。展开更多
Background： Previously, we reported that dual-specificity adenocarcinoma （EEA）. However, the role of DUSP1 medroxyprogesterone （MPA） are still unclear. phosphatase I （DUSPI） was differentially expressed in endo...Background： Previously, we reported that dual-specificity adenocarcinoma （EEA）. However, the role of DUSP1 medroxyprogesterone （MPA） are still unclear. phosphatase I （DUSPI） was differentially expressed in endometrioid in EEA progression and the relationship between DUSPI and Methods： The expression of DUSPI in EEA specimens was detected by immunohistochemical analysis. The effect of DUSPI on cell proliferation was analyzed by Cell Counting Kit 8 and colony formation assay, and cell migration was analyzed by transwell assay. MPA-induced DUSPI expression in EEA cells was measured by Western blot. Results： DUSPI expression was deficient in advanced International Federation of Gynecology and Obstetrics stage, high-grade and myometrial invasive EEA. In EEA cell lines （HeclA, Hecl B, RL952, and Ishikawa）, the DUSP1 expression was substantially higher in lshikawa cells than in other cell lines （P 〈 0.05）. Knockdown ofDUSP I promoted lshikawa cells proliferation, migration, and activation of mitogen-activated protein kinases/extracellular signal-regulated kinase （MAPK/Erk） pathway. MPA-induced DUSP1 expression and inhibited MAPK/Erk pathway in Ishikawa cells. Conclusions： Our data suggest that DUSP1 deficiency promotes EEA progression via MAPK/Erk pathway, which may be reversed by MPA, suggesting that DUSP I may serve as a potential therapeutic target for the treatment of EEA.展开更多
Objective To investigate the effect of fermented barley extracts with Lactobacillus plantarum dy-1（LFBE） for modulating glucose consumption in HepG2 cells via miR-212 regulation. Methods Hepatocellular carcinoma（He...Objective To investigate the effect of fermented barley extracts with Lactobacillus plantarum dy-1（LFBE） for modulating glucose consumption in HepG2 cells via miR-212 regulation. Methods Hepatocellular carcinoma（HepG2） cells were treated with palmitate. After 12 h, palmitate-induced HepG2 cells were treated with LFBE and its main components. Changes in glucose consumption, proinflammatory cytokine secretion, and miRNA-212 expression in HepG2 cells was observed. Results Treatment with LFBE rich in vanillic acid（VA） increased glucose consumption and reduced proinflammatory cytokine secretion in HepG2 cells. LFBE and VA normalized the upregulation of miR-212, which led to the upregulation of dual-specificity phosphatase-9（DUSP9）, a direct target of miR-212, at both protein and mR NA levels. Downregulation of miR-212 markedly increased glucose consumption and reduced proinflammatory cytokine secretion by enhancing DUSP9 expression. Conclusion The results showed the benefit of LFBE and miR-212 downregulation in modulating glucose consumption and reducing proinflammatory cytokine secretion by targeting DUSP9. VA in LFBE was a strong regulator of palmitate-induced abnormal glucose consumption in HepG2 cells and can be a primary mediator.展开更多
基金Supported by Grants SAF2006-06963, SAF2009-09500 and Consolider CSD-2007-00020 to Sastre J BFU2007-63120 and CSD2006-49 to López-Rodas G
文摘Acute pancreatitis is an inflammation of the pancreas that may lead to systemic inflammatory response syndrome and death due to multiple organ failure. Acinar cells, together with leukocytes, trigger the inflammatory cascade in response to local damage of the pancreas. Amplification of the inflammatory cascade requires up-regulation of proinflammatory cytokines and this process is mediated not only by nuclear factor κB but also by chromatinmodifying complexes and chromatin remodeling. Among the different families of histone acetyltransferases, the p300/CBP family seems to be particularly associated with the inflammatory process. cAMP activates gene expression via the cAMP-responsive element (CRE) and the transcription factor CRE-binding protein (CREB). CREB can be phosphorylated and activated by different kinases, such as protein kinase A and MAPK, and then it recruits the histone acetyltransferase co-activator CREB-binding protein (CBP) and its homologue p300. The recruitment of CBP/p300 and changes in the level of histone acetylation are required for transcription activation. Transcriptional repression is also a dynamic and essential mechanism of down-regulation of genes for resolution of inflammation, which seems to be mediated mainly by protein phosphatases (PP1, PP2A and MKP1) and histone deacetylases(HDACs) .Class HDACs are key transcriptional regulators whose activities are controlled via phosphorylationdependent nucleo/cytoplasmic shuttling. PP2A is responsible for dephosphorylation of class HDACs, triggeringnuclear localization and repression of target genes, whereas phosphorylation triggers cytoplasmic localization leading to activation of target genes. The potential benefit from treatment with phosphodiesterase inhibitors and histone deacetylase inhibitors is discussed.
文摘目的:探究双特异性磷酸酶6(Dusp6)对间歇性缺氧(IH)诱导的肺动脉高压(PAH)的影响及其机制。方法:利用基因表达数据库以及体内模型分析Dusp6的差异表达。随后将15只雄性SD大鼠随机分为正常组(Normal组)、慢性间歇缺氧组(CIH组,120 s循环,60 s 6%O_(2),60 s 21%O_(2),8 h/d,持续6周)、CIH+Dusp6抑制组(CIH+AAV1. Dusp6组),CIH处理6周后观察各组大鼠右心收缩压以及肺外周小动脉重塑程度。同时,将大鼠肺动脉平滑肌细胞(RPASMCs)分为正常组、间歇缺氧组(IH组,1 h循环,30 min 1%O_(2),30 min 21%O_(2),持续24 h)、间歇缺氧+Dusp6抑制组(IH+Si-Dusp6组),观察各组RPASMCs增殖、线粒体膜电位和线粒体分裂情况。结果:基因表达数据库以及体内模型显示,与正常组相比,IH组Dusp6表达升高。与正常组相比,CIH组大鼠右心收缩压升高,肺外周小动脉明显重塑;而与CIH组相比,CIH+AAV1. Dusp6组大鼠右心收缩压有所下降,肺外周小动脉重塑程度明显减轻。同时,IH能够诱导RPASMCs的增殖、线粒体膜电位降低和线粒体分裂,而抑制Dusp6能够明显减轻IH诱导的RPASMCs增殖、线粒体膜电位的降低和线粒体分裂。另外,Dusp6能够通过调节Drp1/ERK1/2通路而发挥作用。结论:抑制Dusp6表达可能通过Drp1/ERK1/2通路调节线粒体分裂从而抑制CIH诱导的大鼠肺动脉高压。
文摘Background： Previously, we reported that dual-specificity adenocarcinoma （EEA）. However, the role of DUSP1 medroxyprogesterone （MPA） are still unclear. phosphatase I （DUSPI） was differentially expressed in endometrioid in EEA progression and the relationship between DUSPI and Methods： The expression of DUSPI in EEA specimens was detected by immunohistochemical analysis. The effect of DUSPI on cell proliferation was analyzed by Cell Counting Kit 8 and colony formation assay, and cell migration was analyzed by transwell assay. MPA-induced DUSPI expression in EEA cells was measured by Western blot. Results： DUSPI expression was deficient in advanced International Federation of Gynecology and Obstetrics stage, high-grade and myometrial invasive EEA. In EEA cell lines （HeclA, Hecl B, RL952, and Ishikawa）, the DUSP1 expression was substantially higher in lshikawa cells than in other cell lines （P 〈 0.05）. Knockdown ofDUSP I promoted lshikawa cells proliferation, migration, and activation of mitogen-activated protein kinases/extracellular signal-regulated kinase （MAPK/Erk） pathway. MPA-induced DUSP1 expression and inhibited MAPK/Erk pathway in Ishikawa cells. Conclusions： Our data suggest that DUSP1 deficiency promotes EEA progression via MAPK/Erk pathway, which may be reversed by MPA, suggesting that DUSP I may serve as a potential therapeutic target for the treatment of EEA.
基金supported by the priority academic program development of Jiangsu Higher education institutions and the National Natural Science Foundation of China [3150156931371760]
文摘Objective To investigate the effect of fermented barley extracts with Lactobacillus plantarum dy-1（LFBE） for modulating glucose consumption in HepG2 cells via miR-212 regulation. Methods Hepatocellular carcinoma（HepG2） cells were treated with palmitate. After 12 h, palmitate-induced HepG2 cells were treated with LFBE and its main components. Changes in glucose consumption, proinflammatory cytokine secretion, and miRNA-212 expression in HepG2 cells was observed. Results Treatment with LFBE rich in vanillic acid（VA） increased glucose consumption and reduced proinflammatory cytokine secretion in HepG2 cells. LFBE and VA normalized the upregulation of miR-212, which led to the upregulation of dual-specificity phosphatase-9（DUSP9）, a direct target of miR-212, at both protein and mR NA levels. Downregulation of miR-212 markedly increased glucose consumption and reduced proinflammatory cytokine secretion by enhancing DUSP9 expression. Conclusion The results showed the benefit of LFBE and miR-212 downregulation in modulating glucose consumption and reducing proinflammatory cytokine secretion by targeting DUSP9. VA in LFBE was a strong regulator of palmitate-induced abnormal glucose consumption in HepG2 cells and can be a primary mediator.
