排序方式: 共有46条查询结果,搜索用时 15 毫秒
41.
目的:探讨树莓花青素矢车菊素-3-O-葡萄糖苷(C3G)对小鼠骨髓巨噬细胞(BMDM)炎性细胞因子表达和生成的影响,进而了解C3G调控BMDM极化的机制。方法:取小鼠骨髓细胞,用100 ng/ml巨噬细胞集落刺激因子(M-CSF)诱导为BMDM。将诱导成功的BMDM分为两组,一组BMDM经C3G预处理12 h,再与1 μg/ml脂多糖(LPS)共处理12 h;另一组BMDM经C3G和20 ng/ml IL-4共处理24 h。采用MTT法检测不同浓度C3G对BMDM细胞活性的影响,qRT-PCR法和ELISA法分别检测BMDM促炎细胞介质IL-6、IL-1β、TNF-α、MCP-1、iNOS和抑炎细胞介质IL-10、Arg-1的mRNA水平和蛋白水平。结果: MTT检测结果显示1、5、10、15、20、25和30 μg/ml的C3G对BMDM细胞活力无明显可见的影响,qRT-PCR和ELISA分析结果显示1 μg/ml LPS显著上调BMDM促炎细胞介质的表达,20 ng/ml IL-4显著上调BMDM抑炎细胞介质的表达;5、10和20 μg/ml C3G处理既可明显降低LPS刺激的BMDM促炎细胞介质表达,也可增强IL-4刺激的BMDM抑炎细胞介质表达。结论: C3G通过下调巨噬细胞促炎细胞介质表达和上调巨噬细胞抑炎细胞介质表达,调控BMDM极化,并影响巨噬细胞的炎性反应。 相似文献
42.
《Journal of Science and Medicine in Sport》2020,23(10):908-912
ObjectivesThis study investigated the effect of 7 days’ supplementation with New Zealand blackcurrant extract on thermoregulation and substrate metabolism during running in the heat.DesignRandomized, double-blind, cross-over study.MethodsTwelve men and six women (mean ± SD: Age 27 ± 6 years, height 1.76 ± 0.10 m, mass 74 ± 12 kg, V̇O2max 53.4 ± 7.0 mL kg−1 min−1) completed one assessment of maximal aerobic capacity and one familiarisation trial (18 °C, 40% relative humidity, RH), before ingesting 2 × 300 mg day−1 capsules of CurraNZ™ (each containing 105 mg anthocyanin) or a visually matched placebo (2 × 300 mg microcrystalline cellulose M102) for 7 days (washout 14 days). On day 7 of each supplementation period, participants completed 60 min of fasted running at 65% V̇O2max in hot ambient conditions (34 °C and 40% relative humidity).ResultsCarbohydrate oxidation was decreased in the NZBC trial [by 0.24 g min−1 (95% CI: 0.21–0.27 g min-1)] compared to placebo (p = 0.014, d = 0.46), and fat oxidation was increased in the NZBC trial [by 0.12 g min−1 (95% CI: 0.10 to 0.15 g min−1)], compared to placebo (p = 0.008, d = 0.57). NZBC did not influence heart rate (p = 0.963), rectal temperature (p = 0.380), skin temperature (p = 0.955), body temperature (p = 0.214) or physiological strain index (p = 0.705) during exercise.ConclusionsSeven-days intake of 600 mg NZBC extract increased fat oxidation without influencing cardiorespiratory or thermoregulatory variables during prolonged moderate intensity running in hot conditions. 相似文献
43.
目的 研究花色苷对小鼠腹腔巨噬泡沫细胞胆固醇外流的影响,探讨 花色苷抗动脉粥样硬化的分子机制。方法 以50μg/ml氧化型低密度脂蛋白培养小鼠腹腔巨噬细胞24h形成巨噬泡沫细胞。用1、10、100I.Lmol/L矢车菊定-3-葡萄糖苷(Cy-3-g)和芍药定-3-葡萄糖苷(Pn-3-g)分别培养巨噬泡沫细胞,酶学荧光法检测培养液中胆固醇含量,用定量PCR和激光共聚焦显微镜检测三磷酸腺苷结合盒转运体A1(ABCA1)的表达。结果 花色苷Cy-3-g和Pn-3-g能够促进巨噬泡沫细胞胆固醇外流,这一作用存在时间和剂量一依赖关系。花色苷还能促进巨噬泡沫细胞ABCA1 mRNA和蛋白的表达,ABCA1抑制剂4,4’-二异硫氰酸二丙乙烯12,2’-二磺酸能够阻断花色苷诱导巨噬泡沫细胞胆固醇外流。结论 花色苷Cy-3-g和Pn-3-g通过调控ABCA1的表达从而促进巨噬泡沫细胞胆固醇外流。 相似文献
44.
Black bean (Phaseolus vulgaris L.) as a protective agent against DNA damage in mice. 总被引:5,自引:0,他引:5
L. Azevedo J. C. Gomes P. C. Stringheta . M. M. C. Gontijo C. R. Padovani L. R. Ribeiro D. M. F. Salvadori 《Food and chemical toxicology》2003,41(12):1671-1676
This study was designed to evaluate the toxicogenetic or protective effect of cooked and dehydrated black beans (Phaseolus vulgaris L.) in bone marrow and peripheral blood cells of exposed mice. The frequency of micronuclei detected using the bone marrow erythrocyte micronucleus test and level of DNA lesions detected by the comet assay were chosen as end-points reflecting mutagenic and genotoxic damage, respectively. Initially, Swiss male mice were fed with a 20% black bean diet in order to detect mutagenic and genotoxic activity. However, no increase in the frequency of bone marrow micronucleated polychromatic erythrocytes (MN PCEs) or DNA lesion in leukocytes was observed. In contrast, received diets containing 1, 10 or 20% of black beans, a clear, but not dose-dependent reduction in the frequency of MN PCEs were observed in animals simultaneously treated with cyclophosphamide, an indirect acting mutagen. Similar results were observed in leukocytes by the comet assay. Commercial anthocyanin was also tested in an attempt to identify the bean components responsible for this protective effect. However, instead of being protective, the flavonoid, at the highest dose administered (50 mg/kg bw), induced primary DNA lesion, as detected by the comet assay. These data indicate the importance of food components in preventing genetic damage induced by chemical mutagens, and also reinforce the role of toxicogenetic techniques in protecting human health. 相似文献
45.
L. Azevedo J. C. Gomes P. C. Stringheta . M. M. C. Gontijo C. R. Padovani L. R. Ribeiro D. M. F. Salvadori 《Food and chemical toxicology》2003,41(12):1671
This study was designed to evaluate the toxicogenetic or protective effect of cooked and dehydrated black beans (Phaseolus vulgaris L.) in bone marrow and peripheral blood cells of exposed mice. The frequency of micronuclei detected using the bone marrow erythrocyte micronucleus test and level of DNA lesions detected by the comet assay were chosen as end-points reflecting mutagenic and genotoxic damage, respectively. Initially, Swiss male mice were fed with a 20% black bean diet in order to detect mutagenic and genotoxic activity. However, no increase in the frequency of bone marrow micronucleated polychromatic erythrocytes (MN PCEs) or DNA lesion in leukocytes was observed. In contrast, received diets containing 1, 10 or 20% of black beans, a clear, but not dose-dependent reduction in the frequency of MN PCEs were observed in animals simultaneously treated with cyclophosphamide, an indirect acting mutagen. Similar results were observed in leukocytes by the comet assay. Commercial anthocyanin was also tested in an attempt to identify the bean components responsible for this protective effect. However, instead of being protective, the flavonoid, at the highest dose administered (50 mg/kg bw), induced primary DNA lesion, as detected by the comet assay. These data indicate the importance of food components in preventing genetic damage induced by chemical mutagens, and also reinforce the role of toxicogenetic techniques in protecting human health. 相似文献
46.
目的:观察蓝莓对肝纤维化模型中抗纤维化转录因子Krüppel样因子11(KLF11)的影响,探讨其可能的机制。方法:40只健康同周龄SD大鼠被随机分为正常对照组、蓝莓对照组、模型组和蓝莓预防组,每组10只,使用四氯化碳制作肝纤维化模型。测定各组大鼠血清丙氨酸氨基转移酶(ALT)、天门冬氨酸氨基转移酶(AST)、Ⅳ型胶原、Ⅲ型前胶原(PCⅢ)、透明质酸(HA)和层粘连蛋白水平;Masson和HE染色对肝组织进行病理学检查;Western blot和免疫组织化学染色检测肝组织中KLF11的蛋白表达,Western blot检测肝组织中α-平滑肌肌动蛋白(α-SMA)的蛋白表达; real-time PCR检测肝组织中KLF11和Ⅰ型胶原(ColⅠ)的mRNA表达情况。结果:与正常对照组比较,模型组KLF11蛋白表达显著降低(P<0.01),而α-SMA蛋白表达显著升高(P<0.01);与模型组比较,蓝莓预防组KLF11的mRNA表达显著升高(P<0.01)而ColⅠ的mRNA表达显著降低(P<0.01);与模型组比较,其它各组大鼠血清ALT、AST、HA和PCⅢ水平... 相似文献