游离脂肪酸诱导的肝细胞脂肪变性对巨噬细胞极化的影响

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M2 型极化基因表达,ELISA 检测肝细胞培养上清细胞因子水平。 Western Blot 检测巨噬细胞 Toll 样受体 4(TLR4) / 核因子 - κB(NF - κB)
信号通路相关蛋白表达。 计量资料两组间比较采用独立样本 t 检验;多组间比较采用单因素方差分析,进一步两两比较采用 Tukey 检验。
CM - FFA显著增加巨噬细胞 M1 型基因诱生型一氧化氮合酶 2、TNFα 和 IL - 6 mRNA 表达( P 值均 < 0. 05) ,降低 M2 型基因 IL - 10
mRNA 表达水平( P < 0. 05) 。 Western Blot 检测结果显示,CM - FFA 显著增加巨噬细胞 TLR4、磷酸化 NF - κBp65 和磷酸化 NF - κB
P 值均 < 0. 05) ,并降低脂质分解基因脂酰辅酶 A 氧化酶 1 和肉碱棕榈酰转移酶 1A 的 mRNA 表达( t 值分别为 14. 30、3. 36,P 值
均 < 0. 05) 。FFA 诱导肝细胞培养上清炎性细胞因子 IL - 6、IL - 1β 和 TNFα 的水平明显增加( P 值均 < 0. 05 ) 。 相比 CM - NC,
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Effect of hepatocyte fatty degeneration induced by free fatty acid on macrophage polarization
, , ( , , , , LI Xiaoyun NI Xixi HUA Jing. Department of Gastroenterology Renji Hospital School of Medicine Shanghai Jiao Tong University , ) Shanghai 200001 China
李晓芸,等. 游离脂肪酸诱导的肝细胞脂肪变性对巨噬细胞极化的影响
385
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游离脂肪酸诱导的肝细胞脂肪变性对巨噬细胞极化的影响
李晓芸,倪茜茜,华 静
上海交通大学医学院附属仁济医院消化内科,上海200001
摘要:目的 方法 探讨游离脂肪酸诱导的肝细胞脂肪变性对巨噬细胞极化的影响及可能机制。
结论 抑制因子表达水平( t 值分别为 2. 88、3. 69、3. 54,P 值均 < 0. 05) 。
FFA 诱导的肝细胞脂肪变性和炎症反应可促进巨噬细胞
M1 型极化,启动和触发非酒精性脂肪性肝病发生发展。
关键词:非酒精性脂肪性肝病; 巨噬细胞; 脂肪酸类 中图分类号:R575. 5 文献标志码:A 文章编号: ( ) 1001 - 5256 2021 02 - 0385 - 05
: Abstract Objective To investigate the effect of hepatocyte fatty degeneration induced by free fatty acid on macrophage polarization and
, the possible mechanism. Methods Primary hepatocytes of C57BL / 6 mice were isolated by in situ collagenase perfusion and then the hepa ( ) ( ) ( ) tocytes were divided into control NC group and mixed free fatty acid FFA treatment group. A conditioned medium CM was prepared
结果 与 NC 组相比,FFA 孵育诱导肝细胞内大量脂滴沉积,细胞内甘油三酯和总胆固醇含量明显升高( t 值分别为 15. 65、3. 49,
P 值均 < 0. 05) 。FFA 显著上调肝细胞脂质合成基因固醇调节元件结合蛋白 1C 和脂肪酸合酶的 mRNA 表达( t 值分别为 2. 89、2. 82,
for hepatocytes and was used for the intervention of RAW264. 7 macrophages. Oil red O staining was used to observe lipid deposition in hep
; atocytes real - time PCR was used to measure the mRNA expression of lipid metabolism genes and macrophage M1 / M2 polarization mark ; ; ers ELISA was used to measure the levels of cytokines in supernatant Western blot was used to measure the expression of proteins involved ( ) ( ) in the Toll - like receptor 4 TLR4 / nuclear factor - kappa B NF - κB pathway in macrophages. The independent samples t - test was ; , used for comparison between two groups a one - way analysis of variance was used for comparison between multiple groups and the Tukey , test was used for further comparison between two groups. Results Compared with the NC group the FFA treatment group had the deposi ( , tion of massive lipid droplets in hepatocytes and significant increases in triglyceride and total cholesterol t = 15. 65 and 3. 49 both P < ) , ( , 0 05 . Besides FFA significantly increased the mRNA expression of the lipid synthesis genes SREBP1C and FASN t = 2. 89 and 2. 82 ) ( , both P < 0. 05 and reduced the mRNA expression of the lipid decomposition genes ACOX1 and CPT1A t = 14. 30 and 3. 36 both P < ) ( ), 0 05 in hepatocytes. FFA also induced significant increases in the levels of the inflammatory cytokines interleukin - 6 IL - 6 interleu , ( ) ( ) , kin - 1β and tumor necrosis factor - α TNF - α in supernatant all P < 0. 05 . Compared with the CM - NC group the CM - FFA , , ( ) group had significant increases in the mRNA expression of the M1 phenotype markers iNOS2 TNF - α and IL - 6 all P < 0. 05 and a sig ( ) , nificant reduction in the mRNA expression of the M2 phenotype marker interleukin - 10 P < 0. 05 . Moreover Western blot showed that , , ( , , CM - FFA significantly upregulated the protein expression of TLR4 p - NF - κBp65 and p - IκBα in macrophages t = ��
胶原酶原位灌注法分离
C57BL / 6 小鼠原代肝细胞,将细胞分为对照( NC) 组和混合游离脂肪酸( FFA) 处理组,并制备肝细胞条件培养液( CM) ,以 CM 干预
巨噬细胞株 RAW264. 7。 油红 O 染色检测肝细胞内脂质沉积情况,Real - time PCR 检测肝细胞脂质代谢相关基因和巨噬细胞 M1 /
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