Branched-chain fatty acids(BCFAs)are new bioactive fatty acids with anti-inflammatory properties.However,the role of BCFAs in alleviating ulcerative colitis has not been clarified.Herein,we evaluated the protective ef...Branched-chain fatty acids(BCFAs)are new bioactive fatty acids with anti-inflammatory properties.However,the role of BCFAs in alleviating ulcerative colitis has not been clarified.Herein,we evaluated the protective effect of BCFAs from goat milk in mice with colitis induced using dextran sodium sulfate(DSS)and explored the corresponding mechanism.These results show that BCFAs extracted from goat milk can significantly alleviate weight loss in mice,and reduce the disease activity index and the activity of myeloperoxidase while increasing the content of antioxidant enzymes in colon tissue and reducing the oxidation stress response.These data also show that BCFAs can down-regulate the gene and protein expression of the toll-like receptor 4(TLR4)/nuclear factorκB p65(NF-κB p65)/NOD-like receptor thermal protein domain associated protein 3(NLRP3)signaling pathway,and at the same time significantly reduce the expression of pro-inflammatory factors tumor necrosis factorα(TNF-α),interleukin 1β(IL-1β),and IL-18 in colon tissue,and significantly increase the expression of the anti-inflammatory factor IL-10.In conclusion,these results demonstrated that BCFAs in goat milk exerted effects on colitis-related inflammatory cytokines and inhibited inflammation by inducing the TLR4/NF-κB/NLRP3 pathway to alleviate DSS-induced ulcerative colitis.This study provides evidence for the potential of BCFAs as bioactive fatty acids in food products and to ameliorate ulcerative colitis development in mice.展开更多
目的探究高迁移率族蛋白1(High Mobility Group Box Protein1, HMGB1)通过(Toll-like Receptor4,TLR4)/核因子κB(Nuclear Factor Kappa-B, NF-κB)/NOD样受体热蛋白结构域相关蛋白3(NOD-like Receptor Thermal Protein Domain Associat...目的探究高迁移率族蛋白1(High Mobility Group Box Protein1, HMGB1)通过(Toll-like Receptor4,TLR4)/核因子κB(Nuclear Factor Kappa-B, NF-κB)/NOD样受体热蛋白结构域相关蛋白3(NOD-like Receptor Thermal Protein Domain Associated Protein 3, NLRP3)信号通路介导内皮细胞焦亡在系统性血管炎中的作用机制。方法 研究于2021年10月—2023年9月在齐齐哈尔医学院附属第三医院开展。取人脐静脉血管内皮细胞进行培养,随机分为对照组和实验组,实验组加入人重组HMGB1,对比对照组与实验组、实验组NLRP3及TLR4表达抑制前后,内皮细胞焦亡相关蛋白的表达水平。结果 系统性血管炎组与健康对照组比较,人脐静脉血管内皮细胞中HMGB1、含半胱氨酸的天冬氨酸蛋白水解酶-1(caspase-1)、白细胞介素-1β(interleukin-1β, IL-1β)、白细胞介素-18(interleukin-18, IL-18)水平升高,差异有统计学意义(P均<0.05)。细胞实验中实验组与对照组比较,caspase-1、IL-1β、IL-18水平升高,差异有统计学意义(P均<0.05)。过表达HMGB1并抑制NLRP3可使NLRP3(2.71±0.59 vs 1.24±0.58)、caspase-1(0.69±0.12 vs 0.40±0.03)、IL-1β[(1.75±0.31)pg/mL vs (1.16±0.12)pg/mL]、IL-18[(0.15±0.04)pg/mL vs (0.09±0.01)pg/mL]水平降低,差异有统计学意义(P均<0.05);过表达HMGB1并抑制TLR4可使TLR4(4.93±1.04 vs 1.96±0.84)、NF-κB(5.62±1.39 vs 2.15±1.04)、NLRP3(2.71±0.59 vs 1.24±0.58)、caspase-1(0.69±0.12 vs 0.40±0.03)、IL-1β[(1.75±0.31)pg/mL vs (1.16±0.12)pg/mL]、IL-18[(0.15±0.04)pg/mL vs (0.09±0.01)pg/mL]水平明显降低,差异有统计学意义(P均<0.05)。结论 HMGB1通过调节TLR4/NF-κB/NLRP3信号通路介导内皮细胞焦亡,进而改善系统性血管炎。展开更多
基金financially supported by the 2021 Kabrita Nutrition Grant.
文摘Branched-chain fatty acids(BCFAs)are new bioactive fatty acids with anti-inflammatory properties.However,the role of BCFAs in alleviating ulcerative colitis has not been clarified.Herein,we evaluated the protective effect of BCFAs from goat milk in mice with colitis induced using dextran sodium sulfate(DSS)and explored the corresponding mechanism.These results show that BCFAs extracted from goat milk can significantly alleviate weight loss in mice,and reduce the disease activity index and the activity of myeloperoxidase while increasing the content of antioxidant enzymes in colon tissue and reducing the oxidation stress response.These data also show that BCFAs can down-regulate the gene and protein expression of the toll-like receptor 4(TLR4)/nuclear factorκB p65(NF-κB p65)/NOD-like receptor thermal protein domain associated protein 3(NLRP3)signaling pathway,and at the same time significantly reduce the expression of pro-inflammatory factors tumor necrosis factorα(TNF-α),interleukin 1β(IL-1β),and IL-18 in colon tissue,and significantly increase the expression of the anti-inflammatory factor IL-10.In conclusion,these results demonstrated that BCFAs in goat milk exerted effects on colitis-related inflammatory cytokines and inhibited inflammation by inducing the TLR4/NF-κB/NLRP3 pathway to alleviate DSS-induced ulcerative colitis.This study provides evidence for the potential of BCFAs as bioactive fatty acids in food products and to ameliorate ulcerative colitis development in mice.
文摘目的探究高迁移率族蛋白1(High Mobility Group Box Protein1, HMGB1)通过(Toll-like Receptor4,TLR4)/核因子κB(Nuclear Factor Kappa-B, NF-κB)/NOD样受体热蛋白结构域相关蛋白3(NOD-like Receptor Thermal Protein Domain Associated Protein 3, NLRP3)信号通路介导内皮细胞焦亡在系统性血管炎中的作用机制。方法 研究于2021年10月—2023年9月在齐齐哈尔医学院附属第三医院开展。取人脐静脉血管内皮细胞进行培养,随机分为对照组和实验组,实验组加入人重组HMGB1,对比对照组与实验组、实验组NLRP3及TLR4表达抑制前后,内皮细胞焦亡相关蛋白的表达水平。结果 系统性血管炎组与健康对照组比较,人脐静脉血管内皮细胞中HMGB1、含半胱氨酸的天冬氨酸蛋白水解酶-1(caspase-1)、白细胞介素-1β(interleukin-1β, IL-1β)、白细胞介素-18(interleukin-18, IL-18)水平升高,差异有统计学意义(P均<0.05)。细胞实验中实验组与对照组比较,caspase-1、IL-1β、IL-18水平升高,差异有统计学意义(P均<0.05)。过表达HMGB1并抑制NLRP3可使NLRP3(2.71±0.59 vs 1.24±0.58)、caspase-1(0.69±0.12 vs 0.40±0.03)、IL-1β[(1.75±0.31)pg/mL vs (1.16±0.12)pg/mL]、IL-18[(0.15±0.04)pg/mL vs (0.09±0.01)pg/mL]水平降低,差异有统计学意义(P均<0.05);过表达HMGB1并抑制TLR4可使TLR4(4.93±1.04 vs 1.96±0.84)、NF-κB(5.62±1.39 vs 2.15±1.04)、NLRP3(2.71±0.59 vs 1.24±0.58)、caspase-1(0.69±0.12 vs 0.40±0.03)、IL-1β[(1.75±0.31)pg/mL vs (1.16±0.12)pg/mL]、IL-18[(0.15±0.04)pg/mL vs (0.09±0.01)pg/mL]水平明显降低,差异有统计学意义(P均<0.05)。结论 HMGB1通过调节TLR4/NF-κB/NLRP3信号通路介导内皮细胞焦亡,进而改善系统性血管炎。
