目的探讨25-OH维生素D(25-OH vitamin D,25-OH-VD)对新生儿感染性肺炎(neonatal infectious pneumonia,NIP)的抗炎作用及其作用机制。方法选取2022年1月~2023年1月成都市妇女儿童中心医院收治的65例NIP患儿,根据病情严重程度,分为轻症组...目的探讨25-OH维生素D(25-OH vitamin D,25-OH-VD)对新生儿感染性肺炎(neonatal infectious pneumonia,NIP)的抗炎作用及其作用机制。方法选取2022年1月~2023年1月成都市妇女儿童中心医院收治的65例NIP患儿,根据病情严重程度,分为轻症组(n=34)和重症组(n=31),另选取同期60例健康新生儿为对照组。通过酶联免疫吸附试验(ELISA)检测血清25-OH-VD,白细胞介素-2(inteleukin-2,IL-2)、γ干扰素(interferon-γ,IFN-γ)、肿瘤坏死因子α(tumor necrosis factor-α,TNF-α)和IL-1β水平;蛋白免疫印迹法检测外周血单个核细胞中维生素D受体(vitamin D receptor,VDR)、细胞核转化生长因子β(transforming growth factorβ,TGF-β)/Yes相关蛋白(nucleus-Yes-associated protein,n-YAP)和细胞核转录共激活因子PDZ结合基序(nucleus-transcriptional coactivator with PDZ-binding motif,n-TAZ)通路相关蛋白表达。脂多糖(lipopolysaccharide,LPS)刺激人肺上皮细胞构建NIP体外模型,分为Control组、LPS组和LPS+VD组;CCK-8检测细胞活力;qRT-PCR检测各组细胞中细胞色素P450家族成员28B1(recombinant cytochrome P45027B1,CYP27B1)和VDR的mRNA表达;免疫细胞化学法检测各组细胞YAP阳性细胞核数;免疫荧光检测各组细胞YAP/TAZ复合物核转位;蛋白免疫印迹法检测各组细胞炎性因子相关蛋白表达。结果与对照组相比,轻症组和重症组患儿血清中IL-2(1.91±0.18μg/L,2.63±0.27μg/L vs 1.05±0.12μg/L),IFN-γ(1.73±0.13μg/L,2.18±0.19μg/L vs 1.03±0.07μg/L),TNF-α(1.79±0.08μg/L,2.38±0.13μg/L vs 0.97±0.04μg/L)和IL-1β(2.18±0.07μg/L,2.59±0.11μg/L vs 0.96±0.02μg/L)含量以及TGF-β(1.67±0.21,2.43±0.42 vs 1.02±0.04),n-YAP(2.08±0.11,4.23±0.37 vs 0.99±0.02)和n-TAZ(2.47±0.42,4.21±0.58 vs 1.03±0.05)蛋白表达逐渐升高,25-OH-VD(12.57±2.21μg/L,7.85±2.03μg/L vs 16.76±1.02μg/L)含量和VDR(0.73±0.09,0.51±0.06 vs 1.03±0.08)蛋白表达逐渐降低,差异具有统计学意义(F=18.983~56.782,均P<0.001)。细胞实验结果显示,与Control组相比,LPS组细胞存活率在12h(76.23%±0.73%vs 116.72%±2.14%),24 h(57.23%±0.94%vs 125.76%±1.67%)和48 h(41.23%±0.56%vs 138.56%±1.35%)时显著降低(t=10.342,26.562,37.821);YAP阳性细胞数(47.35±3.47个vs 12.46±1.34个)和YAP/TAZ复合物核转位率(2.56%±0.32%vs 1.01%±0.06%)升高(t=46.362,26.921);IL-2(2.03±0.09 vs 1.03±0.08),IFN-γ(2.07±0.21 vs 1.02±0.04),TNF-α(2.18±0.11 vs 0.99±0.02)和IL-1β(3.17±0.42 vs 1.03±0.05)的蛋白表达水平升高(t=28.341,26.713,31.235,47.823),差异具有统计学意义(均P<0.001),而两组间CYP27B1和VDR mRNA表达差异无统计学意义(t=0.872,0.786,均P>0.05)。与LPS组比较,LPS+VD组在12 h(85.23%±0.36%),24 h(79.82%±0.63%),48 h(76.28%±0.72%)的细胞存活率和CYP27B1(4.42±0.14),VDR mRNA(5.13±0.56)表达升高,YAP阳性细胞核数(24.41±3.23个)和YAP/TAZ复合物核转位率(1.47%±0.26%)降低,IL-2(1.21±0.06),IFN-γ(1.13±0.42),TNF-α(1.03±0.37)和IL-1β(1.61±0.58)蛋白表达降低,差异具有统计学意义(t=7.263,19.892,23.145,27.872,26.982,14.762,13.623,18.273,25.314,27.873,22.134,均P<0.01)。结论血清25-OH-VD水平与NIP严重程度相关,外源性给予VD补充可通过调控TGF-β介导的YAP/TAZ核转位机制发挥抗炎作用,减轻NIP损伤。展开更多
AIM:To investigate the role of nuclear factor of activated T cell 2(NFAT2),the major NFAT protein in peripheral T cells,in sustained T cell activation and intractable inflammation in human ulcerative colitis(UC). METH...AIM:To investigate the role of nuclear factor of activated T cell 2(NFAT2),the major NFAT protein in peripheral T cells,in sustained T cell activation and intractable inflammation in human ulcerative colitis(UC). METHODS:We used two-dimensional gel-electrophoresis, immunohistochemistry,double immunohistochemical staining,and confocal microscopy to inspect the expression of NFAT2 in 107,15,48 and 5 cases of UC, Crohn's disease(CD),non-specific colitis,and 5 healthy individuals,respectively. RESULTS:Up-regulation with profound nucleo- translocation/activation of NFAT2 of lamina propria mononuclear cells(LPMC)of colonic mucosa was found specifically in the affected colonic mucosa from patients with UC,as compared to CD or NC(P<0.001,Kruskal- Wallis test).Nucleo-translocation/activation of NFAT2 primarily occurred in CD8+T,but was less prominent in CD4+T cells or CD20+B cells.It was strongly associated with the disease activity,including endoscopic stage (τ=0.2145,P=0.0281)and histologic grade(τ=0.4167, P<0.001). CONCLUSION:We disclose for the first time the nucleo-translocation/activatin of NFAT2 in lamina propria mononuclear cells in ulcerative colitis.Activation of NFAT2 was specific for ulcerative colitis and highly associated with disease activity.Since activation of NFAT2is implicated in an auto-regulatory positive feedback loop of sustained T-cell activation and NFAT proteins play key roles in the calcium/calcineurin signaling pathways,our results not only provide new insights into the mechanism for sustained intractable inflammation,but also suggest the calcium-calcineurin/NFAT pathway as a new therapeutic target for ulcerative colitis.展开更多
The nuclear factor-kappa B （NF-κB） transcription factor plays a critical role in diverse cellular processes associated with proliferation, cell death, development, as well as innate and adaptive immune responses. ...The nuclear factor-kappa B （NF-κB） transcription factor plays a critical role in diverse cellular processes associated with proliferation, cell death, development, as well as innate and adaptive immune responses. NF-κB is normally sequestered in the cytoplasm by a family of inhibitory proteins known as inhibitors of NF-κB （IκBs）. The signal pathways leading to the liberation and nuclear accumulation of NF-κB, which can be activated by a wide variety of stimuli, have been extensively studied in the past two decades. After gaining access to the nucleus, NF-κB must be actively regulated to execute its fundamental function as a transcription factor. Recent studies have highlighted the importance of nuclear signaling in the regulation of NF-κB transcriptional activity. A non-Rel subunit of NF-κB, ribosomal protein S3 （RPS3）, and numerous other nuclear regulators of NF-κB, including Akirin, Nurrl, SIRT6, and others, have recently been identified, unveiling novel and exciting layers of regulatory specificity for NF-κB in the nucleus. Further insights into the nuclear events that govern NF-κB function will deepen our understanding of the elegant control of its transcriptional activity and better inform the potential rational design of therapeutics for NF-κB-associated diseases.展开更多
Objective To construct adeno-associated virus (AAV) expression system for transforming growth factor β3 (TGFβ3) and detect its biological effect on proteoglycan synthesis of the earlier and later dedifferentiated ra...Objective To construct adeno-associated virus (AAV) expression system for transforming growth factor β3 (TGFβ3) and detect its biological effect on proteoglycan synthesis of the earlier and later dedifferentiated rabbit lumbar disc nucleus pulpous (NP) cells, which was compared with that of adenovirus (AV) expression system for TGFβ1. Methods TGFβ3 gene was obtained using PCR. Its upstream contained restriction enzyme site Kpn Ⅰ, and its downstream contained restriction enzyme site SalⅠ. Using the restriction enzyme sites of PCR product of TGFβ3 and the corresponding multiple cloning site (MCS) in plasmid AAV, TGFβ3 was subcloned into AAV. The recombinant plasmid AAV-TGFβ3 was transfected into H293 cells with LipofectamineTM 2000, and the expression of TGFβ3 gene was detected using immunofluorescent analysis. After AAV-TGFβ3 virus particle with infectious activity was packaged, TGFβ3 expression in NP cells was detected by immunoblotting, and its biological effect on proteoglycan synthesis was detected by antonopulos method and compared with that of AV-TGFβ1 in the earlier and later dedifferentiated NP cells. Results For the earlier dedifferentiated NP cells, AAV-TGFβ3 slowly and stably enhanced proteoglycan synthesis, but AV-TGFβ1 rapidly and transiently enhanced its synthesis. For the later dedifferentiated NP cells, AAV-TGFβ3 stably enhanced proteoglycan synthesis, but AV-TGFβ1 inhibited its synthesis. Conclusion AAV expression system can mediate TGFβ3 gene to be expressed stably, and AAV-TGFβ3 can enhance proteoglycan synthesis of the earlier and later dedifferentiated NP cells.展开更多
OBJECTIVE: To investigate whether the decrease in expression of interleukin-2 (IL-2) after trauma is associated with changes in DNA binding activity of nuclear factor of activated T cells (NFAT) and activator protein-...OBJECTIVE: To investigate whether the decrease in expression of interleukin-2 (IL-2) after trauma is associated with changes in DNA binding activity of nuclear factor of activated T cells (NFAT) and activator protein-1 (AP-1). METHODS: Mice with closed impact injury with fracture in both hind limbs were adopted as the trauma model. Spleen lymphocytes were isolated from traumatized mice and stimulated with Con-A. Culture supernatants were assayed for IL-2 activity, and total RNA was extracted from spleen lymphocytes and assayed for IL-2 mRNA. DNA binding activity of NFAT and AP-1 were measured by electrophoretic mobility shift assay (EMSA). The expression of c-Fos, c-Jun and JunB proteins was determined by the Western blot analysis. RESULTS: DNA binding activity of NFAT and AP-1 gradually decreased to a minimum of 41% and 49%, respectively, of the control on the 4th day after injury, which was closely followed by the decline in IL-2 activity and IL-2 mRNA. A decrease in the expression of c-Fos on the 1st and 4th day after trauma had no significant effect on c-Jun expression; the increase in expression of JunB was only on the 1st day after injury. CONCLUSION: Decreased IL-2 expression is, at least in part, due to a decline in the activation of NFAT and AP-1 in traumatized mice. The decline in DNA binding activity of NFAT and AP-1 is partly due to a trauma-induced block in the expression of c-Fos.展开更多
文摘目的探讨25-OH维生素D(25-OH vitamin D,25-OH-VD)对新生儿感染性肺炎(neonatal infectious pneumonia,NIP)的抗炎作用及其作用机制。方法选取2022年1月~2023年1月成都市妇女儿童中心医院收治的65例NIP患儿,根据病情严重程度,分为轻症组(n=34)和重症组(n=31),另选取同期60例健康新生儿为对照组。通过酶联免疫吸附试验(ELISA)检测血清25-OH-VD,白细胞介素-2(inteleukin-2,IL-2)、γ干扰素(interferon-γ,IFN-γ)、肿瘤坏死因子α(tumor necrosis factor-α,TNF-α)和IL-1β水平;蛋白免疫印迹法检测外周血单个核细胞中维生素D受体(vitamin D receptor,VDR)、细胞核转化生长因子β(transforming growth factorβ,TGF-β)/Yes相关蛋白(nucleus-Yes-associated protein,n-YAP)和细胞核转录共激活因子PDZ结合基序(nucleus-transcriptional coactivator with PDZ-binding motif,n-TAZ)通路相关蛋白表达。脂多糖(lipopolysaccharide,LPS)刺激人肺上皮细胞构建NIP体外模型,分为Control组、LPS组和LPS+VD组;CCK-8检测细胞活力;qRT-PCR检测各组细胞中细胞色素P450家族成员28B1(recombinant cytochrome P45027B1,CYP27B1)和VDR的mRNA表达;免疫细胞化学法检测各组细胞YAP阳性细胞核数;免疫荧光检测各组细胞YAP/TAZ复合物核转位;蛋白免疫印迹法检测各组细胞炎性因子相关蛋白表达。结果与对照组相比,轻症组和重症组患儿血清中IL-2(1.91±0.18μg/L,2.63±0.27μg/L vs 1.05±0.12μg/L),IFN-γ(1.73±0.13μg/L,2.18±0.19μg/L vs 1.03±0.07μg/L),TNF-α(1.79±0.08μg/L,2.38±0.13μg/L vs 0.97±0.04μg/L)和IL-1β(2.18±0.07μg/L,2.59±0.11μg/L vs 0.96±0.02μg/L)含量以及TGF-β(1.67±0.21,2.43±0.42 vs 1.02±0.04),n-YAP(2.08±0.11,4.23±0.37 vs 0.99±0.02)和n-TAZ(2.47±0.42,4.21±0.58 vs 1.03±0.05)蛋白表达逐渐升高,25-OH-VD(12.57±2.21μg/L,7.85±2.03μg/L vs 16.76±1.02μg/L)含量和VDR(0.73±0.09,0.51±0.06 vs 1.03±0.08)蛋白表达逐渐降低,差异具有统计学意义(F=18.983~56.782,均P<0.001)。细胞实验结果显示,与Control组相比,LPS组细胞存活率在12h(76.23%±0.73%vs 116.72%±2.14%),24 h(57.23%±0.94%vs 125.76%±1.67%)和48 h(41.23%±0.56%vs 138.56%±1.35%)时显著降低(t=10.342,26.562,37.821);YAP阳性细胞数(47.35±3.47个vs 12.46±1.34个)和YAP/TAZ复合物核转位率(2.56%±0.32%vs 1.01%±0.06%)升高(t=46.362,26.921);IL-2(2.03±0.09 vs 1.03±0.08),IFN-γ(2.07±0.21 vs 1.02±0.04),TNF-α(2.18±0.11 vs 0.99±0.02)和IL-1β(3.17±0.42 vs 1.03±0.05)的蛋白表达水平升高(t=28.341,26.713,31.235,47.823),差异具有统计学意义(均P<0.001),而两组间CYP27B1和VDR mRNA表达差异无统计学意义(t=0.872,0.786,均P>0.05)。与LPS组比较,LPS+VD组在12 h(85.23%±0.36%),24 h(79.82%±0.63%),48 h(76.28%±0.72%)的细胞存活率和CYP27B1(4.42±0.14),VDR mRNA(5.13±0.56)表达升高,YAP阳性细胞核数(24.41±3.23个)和YAP/TAZ复合物核转位率(1.47%±0.26%)降低,IL-2(1.21±0.06),IFN-γ(1.13±0.42),TNF-α(1.03±0.37)和IL-1β(1.61±0.58)蛋白表达降低,差异具有统计学意义(t=7.263,19.892,23.145,27.872,26.982,14.762,13.623,18.273,25.314,27.873,22.134,均P<0.01)。结论血清25-OH-VD水平与NIP严重程度相关,外源性给予VD补充可通过调控TGF-β介导的YAP/TAZ核转位机制发挥抗炎作用,减轻NIP损伤。
基金a grant from Chang Gung Memorial Hospital,No.CMRPG33074a grant from National Science Council,Taiwan
文摘AIM:To investigate the role of nuclear factor of activated T cell 2(NFAT2),the major NFAT protein in peripheral T cells,in sustained T cell activation and intractable inflammation in human ulcerative colitis(UC). METHODS:We used two-dimensional gel-electrophoresis, immunohistochemistry,double immunohistochemical staining,and confocal microscopy to inspect the expression of NFAT2 in 107,15,48 and 5 cases of UC, Crohn's disease(CD),non-specific colitis,and 5 healthy individuals,respectively. RESULTS:Up-regulation with profound nucleo- translocation/activation of NFAT2 of lamina propria mononuclear cells(LPMC)of colonic mucosa was found specifically in the affected colonic mucosa from patients with UC,as compared to CD or NC(P<0.001,Kruskal- Wallis test).Nucleo-translocation/activation of NFAT2 primarily occurred in CD8+T,but was less prominent in CD4+T cells or CD20+B cells.It was strongly associated with the disease activity,including endoscopic stage (τ=0.2145,P=0.0281)and histologic grade(τ=0.4167, P<0.001). CONCLUSION:We disclose for the first time the nucleo-translocation/activatin of NFAT2 in lamina propria mononuclear cells in ulcerative colitis.Activation of NFAT2 was specific for ulcerative colitis and highly associated with disease activity.Since activation of NFAT2is implicated in an auto-regulatory positive feedback loop of sustained T-cell activation and NFAT proteins play key roles in the calcium/calcineurin signaling pathways,our results not only provide new insights into the mechanism for sustained intractable inflammation,but also suggest the calcium-calcineurin/NFAT pathway as a new therapeutic target for ulcerative colitis.
文摘The nuclear factor-kappa B （NF-κB） transcription factor plays a critical role in diverse cellular processes associated with proliferation, cell death, development, as well as innate and adaptive immune responses. NF-κB is normally sequestered in the cytoplasm by a family of inhibitory proteins known as inhibitors of NF-κB （IκBs）. The signal pathways leading to the liberation and nuclear accumulation of NF-κB, which can be activated by a wide variety of stimuli, have been extensively studied in the past two decades. After gaining access to the nucleus, NF-κB must be actively regulated to execute its fundamental function as a transcription factor. Recent studies have highlighted the importance of nuclear signaling in the regulation of NF-κB transcriptional activity. A non-Rel subunit of NF-κB, ribosomal protein S3 （RPS3）, and numerous other nuclear regulators of NF-κB, including Akirin, Nurrl, SIRT6, and others, have recently been identified, unveiling novel and exciting layers of regulatory specificity for NF-κB in the nucleus. Further insights into the nuclear events that govern NF-κB function will deepen our understanding of the elegant control of its transcriptional activity and better inform the potential rational design of therapeutics for NF-κB-associated diseases.
基金Supported by the National Natural Sciences Foundation of China(30271318).
文摘Objective To construct adeno-associated virus (AAV) expression system for transforming growth factor β3 (TGFβ3) and detect its biological effect on proteoglycan synthesis of the earlier and later dedifferentiated rabbit lumbar disc nucleus pulpous (NP) cells, which was compared with that of adenovirus (AV) expression system for TGFβ1. Methods TGFβ3 gene was obtained using PCR. Its upstream contained restriction enzyme site Kpn Ⅰ, and its downstream contained restriction enzyme site SalⅠ. Using the restriction enzyme sites of PCR product of TGFβ3 and the corresponding multiple cloning site (MCS) in plasmid AAV, TGFβ3 was subcloned into AAV. The recombinant plasmid AAV-TGFβ3 was transfected into H293 cells with LipofectamineTM 2000, and the expression of TGFβ3 gene was detected using immunofluorescent analysis. After AAV-TGFβ3 virus particle with infectious activity was packaged, TGFβ3 expression in NP cells was detected by immunoblotting, and its biological effect on proteoglycan synthesis was detected by antonopulos method and compared with that of AV-TGFβ1 in the earlier and later dedifferentiated NP cells. Results For the earlier dedifferentiated NP cells, AAV-TGFβ3 slowly and stably enhanced proteoglycan synthesis, but AV-TGFβ1 rapidly and transiently enhanced its synthesis. For the later dedifferentiated NP cells, AAV-TGFβ3 stably enhanced proteoglycan synthesis, but AV-TGFβ1 inhibited its synthesis. Conclusion AAV expression system can mediate TGFβ3 gene to be expressed stably, and AAV-TGFβ3 can enhance proteoglycan synthesis of the earlier and later dedifferentiated NP cells.
文摘OBJECTIVE: To investigate whether the decrease in expression of interleukin-2 (IL-2) after trauma is associated with changes in DNA binding activity of nuclear factor of activated T cells (NFAT) and activator protein-1 (AP-1). METHODS: Mice with closed impact injury with fracture in both hind limbs were adopted as the trauma model. Spleen lymphocytes were isolated from traumatized mice and stimulated with Con-A. Culture supernatants were assayed for IL-2 activity, and total RNA was extracted from spleen lymphocytes and assayed for IL-2 mRNA. DNA binding activity of NFAT and AP-1 were measured by electrophoretic mobility shift assay (EMSA). The expression of c-Fos, c-Jun and JunB proteins was determined by the Western blot analysis. RESULTS: DNA binding activity of NFAT and AP-1 gradually decreased to a minimum of 41% and 49%, respectively, of the control on the 4th day after injury, which was closely followed by the decline in IL-2 activity and IL-2 mRNA. A decrease in the expression of c-Fos on the 1st and 4th day after trauma had no significant effect on c-Jun expression; the increase in expression of JunB was only on the 1st day after injury. CONCLUSION: Decreased IL-2 expression is, at least in part, due to a decline in the activation of NFAT and AP-1 in traumatized mice. The decline in DNA binding activity of NFAT and AP-1 is partly due to a trauma-induced block in the expression of c-Fos.
