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51.
AIM: To investigate the anticancer effect of manumycin on abdominal metastatic breast cancer cell line - SK-BR-3 and its relationship with p38 MAPK. METHODS: The test of anticancer effect was performed by the method of MTT, apoptosis induced by manumycin and affected by SB203580, a specific p38 MAPK inhibitor, were examined by caspase-3 activity assay kit, and the protein expression was detected by immunoblotting assay. RESULTS: The inhibition rates at 24 h after treatment with manumycin of 6 μmol/L, 18 μmol/L, 54 μmol/L were (7.4±3.9)%, (21.0±4.4)% and (64.7±4.1)%, respectively and showed dosage-effect relationship. Compared with the control group, the survival rates of the last two treatment groups were decreased significantly (P<0.01). The value of IC50 24 h after treatment with manumycin was 42.5 μmol/L. Manumycin simultaneously activated caspase-3 protein, which was partly blocked by p38 MAPK inhibitor, SB203580. The results of immunoblotting showed that manumycin increased p38 MAPK protein phosphorylation. CONCLUSION: Manumycin exerts anticancer effect on SK-BR-3 cell line via inducing cell apoptosis, which is partly regulated by p38 MAPK. 相似文献
52.
The 2004 Indian Ocean tsunami inundated about 37,500 ha of coastal farmland in Aceh, and crops planted after the tsunami were severely affected by soil salinity. This paper describes the changes of soil salinity over time on tsunami affected farms and the implications for resuming crop production after natural disasters.Soil salinity and salt leaching processes were assessed across the tsunami affected region by measuring soil apparent electrical conductivity (ECa) using an electromagnetic induction soil conductivity instrument (EM38) combined with limited soil analysis. The ECa was measured 5 times between August 2005 and December 2007 in both the vertical (EMv) and horizontal (EMh) dipole orientations at 23 sites across Aceh. The level of salinity and direction of salt movement were assessed by comparing changes in mean profile ECa and relative changes in EMv and EMh.Eight months after the tsunami the average soil salinity in the 0-1.2 m soil depth varied from ECe 22.6 to 1.6 dS m−1 across sites in the affected region and three years after the tsunami it varied from 13.0 to 1.4 dS m−1. Soil salinity tended to be higher in rice paddy areas that trapped saline tsunami sediments and held seawater for longer periods. Leaching of salts occurred slowly by both vertical displacement and horizontal movement in surface waters. Hence, soil salinity persisted at a level which could reduce crop production for several years after the 2004 tsunami. High soil salinity persisted three years after the tsunami even though there had been more than 3000-7000 mm of accumulated rainfall to leach salts. The slow leaching is likely to have been due to the loss of functional drainage systems and general low relief of the affected areas.Monitoring of soil salinity with EM38 assisted local agricultural extension agencies to identify sites that were too saline for crops and determine when they were suitable for cropping again. The methodology used in this study could be used after similar disasters where coastal agriculture areas become inundated by seawater from storm surges or future tsunamis. 相似文献
53.
AIM:To investigate the effect of erianin on the viability and apoptosis of human lung cancer A549 cells and its possible mechanism. METHODS:A549 cells and BEAS-2B cells were cultured in vitro and treated with erianin at 10, 20, 40, 80 and 160 nmol/L for 48 h. The cell viability was measured by CCK-8 assay. The apoptosis and reactive oxygen species (ROS) were analyzed by flow cytometry. The activity of superoxide dismutase (SOD) was detected by WST-8 method, and the content of malondialdehyde (MDA) was detected by barbituric acid method. The protein levels of nuclear factor E2-related factor 2 (Nrf2), NAD(P)H:quinone oxidoreductase-1 (NQO1), heme oxygenase-1 (HO-1), p38 MAPK, p-p38 MAPK, caspase-3 and cleaved caspase-3 were determined by Western blot.RESULTS:Erianin remarkably reduced the viability of A549 cells in a dose-dependent manner (P<0.05) with IC50 at 52.64 nmol/L. Erianin also induced apoptosis (P<0.05), increased ROS level and MDA content (P<0.05), diminished SOD activity (P<0.05), and down-regulated the protein levels of Nrf2, NQO1 and HO-1 (P<0.05), in a dose-dependent manner. Meanwhile, erianin up-regulated the levels of p-p38 MAPK and cleaved caspase-3 (P<0.05), and these effects were inhibited by N-acetyl-L-cysteine and SB203580 (P<0.05).CONCLUSION:Erianin may induce apoptosis of human lung cancer A549 cells most likely via inhibiting SOD activity and down-regulating the protein levels of Nrf2, NQO1 and HO-1, thus resulting in an increase in ROS and activation of p38 MAPK. 相似文献
54.
AIM:To explore the effect of microRNA-155(miR-155)over-expression on the expression of inflammatory factors and indolamine 2, 3- dioxygenase (IDO) in the microglial BV-2 cells. METHODS:For over-expression of miR-155, the BV-2 cells were transfected with lentiviral vector carrying mmu-miR-155. The expression of inflammatory factors was detected by cytometric bead array system (CBA). The mRNA expression of inflammatory factors and IDO was analyzed by real-time PCR. The protein levels of suppressor of cytokine signalling 1 (SOCS1), p-p38 MAPK and IDO were determined by Western blot. RESULTS:The expression of miR-155 was up-regulated in the BV-2 cells transfected with lentiviral vector carrying mmu-miR-155 compared with LPS treatment group (P<0.01). The miR-155 over-expression promoted the secretion of interleukin-6 (IL-6), tumor necrosis factor-α (TNF-α), monocyte chemotactic protein-1 (MCP-1) and IL-10, and inhibited the secretion of IL-12. The miR-155 over-expression increased the mRNA expression of IL-6, TNF-α, IL-10 and IDO, also increased the protein levels of IDO and p-p38 MAPK, but decreased the protein expression of SOCS1 (P<0.01). LPS promoted the secretion of IL-6, TNF-α, MCP-1 and IL-12, also increased the mRNA expression of IL-6, TNF-α and IDO, meanwhile, increased the protein levels of IDO, p-p38 MAPK and SOCS1 (P<0.01). CONCLUSION:Over-expression of miR-155 promotes the secretion of related imflammatory factors and protein expression of IDO in microglial BV-2 cells mediated with SOCS1 and p38 MAPK signaling pathway. 相似文献
55.
京单38不同播期子粒灌浆特性研究 总被引:5,自引:2,他引:5
以郑单958为对照,设置春播(5月14日)和夏播(6月13日)两个播期处理,研究玉米品种京单38在不同生态条件下的子粒灌浆特性。结果表明,京单38的百粒干物重高于对照品种郑单958,春、夏播条件下增幅分别为14.74%和20.26%,春播百粒干物重较夏播高1.87%。京单38的子粒灌浆速率高于郑单958,春、夏播最大灌浆速率分别较对照高42.27%和49.50%,夏播最大灌浆速率较春播高9.42%。相关和通径分析表明,最大灌浆速率与粒重呈极显著正相关,与郑单958相比,京单38子粒灌浆速率高且灌浆速度快,春、夏播条件下均可获得较高的粒重。 相似文献
56.
57.
早熟春玉米杂交种同单38的选育及应用 总被引:2,自引:0,他引:2
同单38是山西省农业科学院高寒区作物研究所玉米研究中心以自交系母本1262与父本同71杂交而成玉米单交种,该品种属早熟春玉米品种,2001-2005年在各级各类试验及生产中表现出高产、优质、抗病和适应性好等特点,产量在8500~9500kg/hm2。适宜在早熟春玉米区种植,种植密度以6万株/hm2为宜。 相似文献
58.
59.
崔玉东 《中国预防兽医学报》2000,(Z1)
用血清调理的酵母聚糖(serum-opsonized zymosan ,sOZ)刺激多性核白细胞(PMN)引起的O2-产生受到p38MAPK抑制物(SB203580),PI3-K抑制物(wortmannin)和PKC抑制物(GF109203X)的明显抑制,这些抑制物也明显引起sOZ诱导的一种NADPH氧化酶的胞浆成分 p47phox的磷酸化。可是流式细胞分析表明,SB203580和 wortmannin使吞噬作用减弱,而 GFIO9203X使吞噬作用增强。这些结果表明,虽然PI3-K和p38 MAPK都参与NADPH氧化酶激活和吞噬作用的信号传导,但NADPH氧化酶激活的信号传导途径与吞噬作用的信号传导途径不同。 相似文献
60.
Shih-Ying YEN Jung-Kai TSENG Show-Mei CHUANG Shuen-Ei CHEN Jyh-Cherng JU 《The Journal of reproduction and development》2014,60(5):388-394
In this study, we determined the expression and activation of p38 MAPK in matured porcine oocytes subjected to heat shock
(HS). When MII oocytes were heated, only the phosphorylated p38 levels relative to the total p38 levels decreased (P <
0.01) after HS, but no clear relationship with HS treatments was observed in the ERK, JNK and p90rsk expressions
of matured oocytes. To confirm p38 activation in matured oocytes, immunocytochemical staining was performed to localize its
expression and distribution in the ooplasm, and the results were largely consistent with previous Western blot analyses.
Moreover, when matured oocytes were co-cultured with a P38 MAPK inhibitor, SB203580, for 4 h at 41.5 C, the activation of its
immediate downstream substrate MAPKAPK-2 was not inhibited within any of the treatment groups. It appears that the MAPKAPK2
levels increased only under prolonged culture (HS4h and C4h) compared with the control group. In conclusion, p38 activity in
porcine oocytes was decreased after exposure to HS and prolonged culture. These alterations of p38 and activation of MAPKAPK2
may be associated with porcine oocyte viability under HS conditions, and a potential cross-talk between p38 MAPK and other
signaling cascades may exist, which warrants additional investigation. 相似文献