Akt/mTOR活化抗UVB诱导HaCaT细胞凋亡的研究

目的 探讨Akt/mTOR信号通路活化抗中波紫外线（UVB）诱导的HaCaT细胞凋亡。方法 UVB照射角质形成细胞,Western印迹检测Akt/mTOR通路中相关信号分子的动态水平变化。免疫荧光 Hoechst 33342染色观察HaCaT细胞凋亡率。结果 UVB能活化Akt/mTOR信号通路,并在一定范围内（5 ～ 30 mJ/cm2）成剂量依赖性,在一定范围内（5 ～ 30 min）成时间依赖性。EGFR抑制剂PD 153035、PI3K抑制剂LY 294002和mTOR抑制剂雷帕霉素能显著抑制UVB对Akt/mTOR信号通路的活化作用。UVB照射前加入雷帕霉素、LY 294002预处理,HaCaT细胞凋亡率增加。结论 Akt/mTOR活化抗UVB诱导的HaCaT细胞凋亡。     

曲克芦丁对UVB诱导HaCaT细胞损伤的保护作用

目的研究曲克芦丁对中波紫外线(UVB)诱导的HaCaT细胞光损伤的保护作用及机制。方法将培养的HaCaT细胞分为空白对照组、UVB组、曲克芦丁组、曲克芦丁+UVB组。其中UVB组、曲克芦丁+UVB组予50m J/cm~2的UVB照射,曲克芦丁组、曲克芦丁+UVB组分别加入不同浓度的曲克芦丁干预。用CCK-8法检测细胞增殖能力。Hoechst染色法检测细胞凋亡。Western blot法检测丝裂原活化蛋白激酶(MAPK)信号通路相关蛋白p-P38,p-JNK,p-ERK,以及激活蛋白-1(AP-1)的组件c-Fos,c-Jun的表达情况。结果 CCK-8法提示,5~10μmol/L的曲克芦丁对UVB诱导的HaCaT细胞光损伤有较好的保护作用(P0.05)。Hoechst染色显示,UVB组凋亡细胞较空白对照组增多,曲克芦丁+UVB组凋亡细胞较UVB组减少。Western blot法提示UVB照射后HaCaT细胞p-P38,p-ERK,p-JNK,p-c-Jun及c-Fos水平升高,曲克芦丁+UVB组有不同程度下降。结论曲克芦丁对UVB诱导的HaCaT细胞光损伤有一定的保护作用。     

安石榴苷对中波紫外线诱导HaCaT细胞光损伤的预防作用研究

目的 探讨安石榴苷对中波紫外线（UVB）诱导角质形成细胞损伤的保护机制。 方法 培养的HaCaT细胞分为空白对照组、安石榴苷组、UVB组、安石榴苷 + UVB组。噻唑蓝（MTT）法检测细胞增殖能力,Hoechst/碘化丙锭（PI）染色和流式细胞仪检测细胞凋亡,RT-PCR法测定金属基质蛋白酶1（MMP1）及其组织抑制因子1（TIMP1） mRNA表达水平,Western印迹检测丝裂原活化蛋白激酶（MAPK）通路相关蛋白P38、JNK、ERK的磷酸化水平变化。 结果 MTT试验示,10 ～ 40 μmol/L安石榴苷对UVB诱导的HaCaT细胞损伤有较佳的预保护作用。UVB组HaCaT细胞强Hoechst和强PI双染细胞较空白对照组增多,安石榴苷 + UVB组较UVB组减少。流式细胞仪分析,UVB组凋亡细胞百分率（9.82% ± 0.11%）高于空白对照（1.24% ± 0.91%,P < 0.01）,而安石榴苷（10、20、40 μmol/L） + UVB组凋亡细胞百分率（分别为6.38% ± 0.14%、5.24% ± 0.17%、3.77% ± 0.11%）较UVB组低,差异有统计学意义（均P < 0.01）。UVB组MMP1 mRNA相对表达量（12.376 ± 0.602）高于空白对照组（1.007 ± 0.147,P < 0.01）,而TIMP1 mRNA相对表达量（0.103 ± 0.006）低于空白对照组（1.006 ± 0.139,P < 0.01）,安石榴苷组MMP1及TIMP1 mRNA与空白对照组比较,差异无统计学意义（均P > 0.05）。安石榴苷预处理的HaCaT细胞经30 mJ/cm2 UVB照射后MMP1 mRNA相对表达量较UVB组降低（均P < 0.01）,而TIMP1 mRNA较UVB组升高（均P < 0.01）。Western印迹示,经UVB照射后,HaCaT细胞p-ERK、p-JNK及p-p38表达升高（均P < 0.01）。安石榴苷组HaCaT细胞p-ERK、p-JNK及p-p38表达没有明显改变（P > 0.05）,而安石榴苷 + UVB组有不同程度下降（均P < 0.01）。 结论 安石榴苷对UVB引起HaCaT细胞损伤有一定的预防作用。     

双氢睾酮对HaCaT细胞SREBP-1c表达的影响

目的 探讨双氢睾酮（DHT）在HaCaT细胞固醇调控元件结合蛋白-1c（SREBP-1c）表达中的作用。 方法 体外培养HaCaT细胞,分为4组,对照组不加任何刺激因素,DHT组分别加入3种不同浓度的DHT,LY294002 + DHT组在加入50 μmol/L PI3K抑制剂（LY294002）预处理40 min后加入100 nmol/L DHT,PD98059 + DHT组即在加入50 μmol/L MEK抑制剂（PD98059）预处理40 min后加入100 nmol/L DHT。用实时定量PCR和Western印迹法检测DHT对HaCaT细胞SREBP-1c mRNA和蛋白表达的影响。Western印迹法检测DHT作用于HaCaT细胞后蛋白激酶B（AKT）、胞外信号调控激酶（ERK）、p38丝裂原活化蛋白激酶（p38 MAPK）、c-Jun氨基末端激酶（JNK）的磷酸化情况。 结果 DHT可呈浓度依赖性上调HaCaT细胞SREBP-1c mRNA和蛋白的表达,并诱导AKT、ERK的磷酸化,但对p38、JNK的磷酸化无明显激活作用。LY294002预处理后HaCaT细胞SREBP-1c mRNA的表达较单纯DHT组明显降低（t = 9.406,P < 0.05）;SREBP-1蛋白水平降为0.7113 ± 0.0313,与单纯DHT组2.2577 ± 0.0601比较,差异有统计学意义（t = 39.498,P < 0.05）。而PD98059预处理后,SREBP-1c mRNA和蛋白的表达与单纯DHT组比较,差异均无统计学意义（P > 0.05）。结论 DHT可诱导HaCaT细胞SREBP-1c mRNA和蛋白的表达。     

驱虫斑鸠菊联合紫外线照射对HaCaT细胞分泌细胞因子及其对A375细胞增殖和迁移的影响

目的:研究驱虫斑鸠菊(Vernonia anthelmintica,VW)分别联合长波紫外线(UVA)、中波紫外线(UVB)照射对人永生化角质形成细胞株HaCaT细胞产生细胞因子及其对人黑素瘤细胞株A375细胞增殖和迁移的影响.方法:UVA及UVB分别照射预先用VW孵育的HaCaT细胞,ELISA方法测定培养上清液中内皮素(ET)-1、碱性成纤维细胞生长因子(bFGF)及干细胞生长因子(SCF)含量,培养上清液作为条件化培养基培养A375细胞,MTT法测定A375细胞增殖变化,微孔滤膜法测定A375细胞迁移功能的变化.结果:VW联合UVB能明显促进HaCaT细胞分泌ET-1、bFGF及SCF;UVB能促进HaCaT细胞ET-1及bFGF分泌,这两组细胞的培养上清液明显促进A375细胞的增殖及迁移.VW、VW联合UVA及UVA对HaCaT细胞3种细胞因子分泌及对A375细胞增殖和迁移均无明显促进作用.结论:Vw联合UVB及UVB可上调HaCaT细胞ET-1和bFGF的分泌,前者还能提高SCF的分泌;两组都能促进A375细胞增殖及迁移.     

A型肉毒素下调UVB诱导的HaCaT细胞炎症因子的表达

目的探讨A型肉毒素是否通过MAPK信号通路下调UVB诱导的HaCaT细胞炎症因子的表达。方法培养HaCaT细胞,分为4组:对照组(未做任何处理);UVB组(80 mJ/cm~2);UVB+A型肉毒素组(80 mJ/cm~2+5 IU/mL);A型肉毒素组(5 IU/mL)。采用酶联免疫吸附试验检测HaCaT细胞培养液中的IL-6及IL-8细胞炎症因子的表达情况。通过蛋白免疫印迹法测定细胞内MAPK相关通路蛋白的表达水平。结果与UVB组相比,UVB+A型肉毒素组IL-6及IL-8细胞炎性因子释放减少。与对照组相比,UVB组p-ERK、p-JNK表达水平增加。UVB+A型肉毒素组与UVB组比较,p-ERK、p-JNK表达水平下降,而p-AKT~(Ser473)及p-P38无明显改变。结论 A型肉毒素可能通过p-ERK、p-JNK信号通路下调UVB诱导的HaCaT细胞炎症因子的表达。     

白芍总苷对角质形成细胞增殖及血管内皮生长因子和白介素-23表达的影响

目的 研究白芍总苷（TGP）对角质形成细胞增殖和分泌血管内皮生长因子（VEGF）和白介素（IL）-23的影响,探讨可能涉及的信号转导通路。方法 不同浓度TGP作用于体外培养的HaCaT细胞株,噻唑蓝（MTT）法观察TGP对HaCaT细胞增殖活性的影响。将HaCaT细胞分为三组,即对照组不加任何刺激因素,TGP组分别加入6种不同浓度的TGP,SB203580组在加入10 mol/L SB203580预处理2 h后加入125 mg/L TGP。实时定量PCR（RT-PCR）方法和ELISA方法检测TGP对HaCaT细胞VEGF和IL-23表达的影响;免疫印迹技术观察TGP作用于HaCaT细胞后p38的磷酸化及SB203580对p38磷酸化的影响。结果 TGP在低浓度（0.5、2.5 mg/L）时对HaCaT细胞增殖有促进作用,浓度≥12.5 mg/L时反而对细胞的增殖有抑制作用,至125 mg/L时抑制作用最强。TGP在低浓度（0.5、2.5 mg/L）时对HaCaT细胞VEGF和IL-23 mRNA和蛋白的表达有促进作用,12.5 ～ 125 mg/L时内可抑制HaCaT细胞VEGF mRNA和蛋白的表达,62.5 ～ 125 mg/L时可抑制IL-23 mRNA和蛋白的表达。TGP可时间依赖性地诱导HaCaT细胞p38的磷酸化,磷酸化p38 蛋白于125 mg/L TGP作用5 min后达到高峰,表达水平为0.3314 ± 0.0245,10 min后减弱至0.2173 ± 0.0189,但均高于对照组水平;30 min后表达水平降为0.1664 ± 0.0201;SB203580可减弱其作用,SB203580预处理组磷酸化p-p38 表达水平为0.1529 ± 0.0147。结论 TGP可抑制HaCaT细胞的增殖及VEGF和IL-23 mRNA和蛋白的表达,p38MAPK信号途径可能介导其抑制作用。     

中波紫外线对体外培养HaCaT细胞MAPK信号通路的影响

目的 探讨中波紫外线照射后不同时间点体外培养的HaCaT细胞MAPK信号通路受调控效应。 方法 1.5、4.5、7.5、10、20、30、50 mJ/cm2中波紫外线照射HaCaT细胞后8 h,对照组细胞除不进行UVB照射外,其他处理同各剂量UVB组,蛋白免疫印迹法测定ERK1/2、JNK和p38蛋白表达及磷酸化水平;50 mJ/cm2中波紫外线照射HaCaT细胞,蛋白免疫印迹法测定照射后2、4、8、12 h 4个时间点,细胞ERK1/2、JNK和p38蛋白表达及磷酸化水平。使用Quantity One软件计算目的条带吸光度,以相应蛋白条带的吸光度值与GAPDH蛋白内参条带吸光度值的比值表示相对蛋白含量。 结果 7.5、10、20、30、50 mJ/cm2 UVB照射HaCaT细胞后8 h,ERK1/2、JNK磷酸化水平明显上调（P < 0.05）,20、30、50 mJ/cm2 UVB照射HaCaT细胞后p38磷酸化水平上调显著（P < 0.05）,且都在50 mJ/cm2照射后效应最为显著（P < 0.05）。50 mJ/cm2 UVB照射HaCaT细胞后8 h,ERK1/2磷酸化产物水平出现上调,在处理后的12 h,与对照组（10.277 ± 0.320）比较,差异有统计学意义（44.844 ± 2.023,P < 0.05）,而p38和JNK磷酸化产物水平在照射后2 h即开始上调（P < 0.05）,4、8、12 h,p38和JNK与对照相比,UVB照射后虽存在着显著地磷酸化水平差异（P < 0.05）,但随时间推移JNK磷酸化产物水平这种上调的趋势逐渐弱化（P < 0.05）。 结论 在50 mJ/cm2中波紫外线照射后的HaCaT细胞中,ERK1/2、p38、JNK这3种MAPK信号通路产生了活化效应,具有一定的时间效应差异。     

柴达木枸杞多糖对UVB诱导人HaCaT细胞氧化损伤及凋亡相关蛋白的影响

目的观察枸杞多糖对中波紫外线(UVB)辐射后人角质形成(HaCaT)细胞的氧化损伤及p38丝裂原活化蛋白激酶(p38MAPK)、半胱氨酸蛋白酶-8(caspase-8)、半胱氨酸蛋白酶-3(caspase-3)、B细胞淋巴瘤因子2(Bcl-2)表达的影响。方法超声辅助水提法制备枸杞多糖(LBP)粉末,体外培养HaCaT细胞,随机分为空白对照组、UVB照射组(UVB 30m J/cm~2辐射40min)、UVB+LBP组(UVB 30m J/cm~2辐射40min+LBP 1mg/m L),照射前12h加入LBP,照射结束后继续培养20h,倒置显微镜观察细胞形态;MTS法检测各组细胞吸光度值(A值);酶生化法检测超氧化物歧化酶(SOD)活力、过氧化氢酶(CAT)活力和谷胱甘肽过氧化物酶(GSH-Px)含量和丙二醛(MDA)含量;Western blot法测定各组细胞p38MAPK,caspase-8,caspase-3和Bcl-2的表达水平。结果与对照组相比,UVB照射组细胞形态明显异常,漂浮的死细胞明显增多;与UVB照射组相比,UVB+LBP组细胞的形态趋于正常,漂浮的死细胞明显减少。UVB照射组较对照组细胞吸光度(A值)明显降低(P0.05);UVB+LBP组细胞吸光度较UVB照射组明显升高(P0.05)。UVB照射组SOD活力、CAT活力、GSH-Px含量较对照组降低,MDA含量较对照组升高(P0.05);UVB+LBP组细胞SOD活力、CAT活力、GSH-Px含量较UVB照射组升高,MDA含量较UVB照射组降低(P0.05)。UVB照射组p38MAPK,caspase-8,caspase-3蛋白表达量明显高于对照组,Bcl-2表达量明显低于对照组(P0.05);与UVB照射组相比,UVB+LBP组HaCaT细胞p38MAPK,caspase-8,caspase-3表达水平降低,Bcl-2表达水平升高(P0.05)。结论枸杞多糖可抑制UVB辐射后HaCaT细胞的氧化损伤,并下调p38MAPK,caspase-8,caspase-3及上调Bcl-2的表达水平。     

外源性胆绿素对中波紫外线诱导的HaCaT细胞光损伤的保护作用

目的 探讨外源性胆绿素对中波紫外线（UVB）照射的HaCaT细胞的保护作用及其机制。方法 将培养的HaCaT细胞分为对照组（不加胆绿素,不照射UVB）、UVB组（30 mJ/cm2 UVB照射）和100 nmol/L、1 μmol/L、10 μmol/L胆绿素 + UVB组（分别于30 mJ/cm2 UVB照射前1 h加入相应浓度胆绿素）,处理完成后继续培养24 h,观察HaCaT细胞形态变化,CCK8法检测各实验组细胞生存率。Western 印迹检测抗氧化信号分子Nrf?2蛋白及光损伤信号分子基质金属蛋白酶1（MMP?1）和MMP?3蛋白表达。结果 CCK8法结果显示,UVB组HaCaT细胞活力低于对照组（P < 0.05）,在加入100 nmol/L、1 μmol/L、10 μmol/L 胆绿素预处理后,细胞生存率逐渐升高,与UVB组比较,差异有统计学意义（均P < 0.05）。Western印迹显示,UVB组MMP?1（1.150 ± 0.187）、MMP?3（0.979 ± 0.054）蛋白表达较对照组（0.116 ± 0.018、0.636 ± 0.035）升高（均P < 0.01）,而100 nmol/L、1 μmol/L、10 μmol/L胆绿素 + UVB组MMP?1（0.825 ± 0.139、0.313 ± 0.047和0.286 ± 0.036）、MMP?3（0.888 ± 0.017、0.672 ± 0.042和0.569 ± 0.037）蛋白表达较UVB组降低（均P < 0.05）。UVB组Nrf?2蛋白（0.906 ± 0.034）较对照组（1.242 ± 0.141）表达降低（P < 0.05）,100 nmol/L、1 μmol/L、10 μmol/L胆绿素 + UVB组Nrf?2蛋白表达（1.556 ± 0.112、1.897 ± 0.234和2.035 ± 0.274）较UVB组升高（均P < 0.01）。结论 外源性胆绿素对UVB诱导的HaCaT细胞损伤起保护作用,该作用可能与Nrf?2抗氧化信号通路有关。     

Activation of p38 mitogen-activated protein kinase and caspases in UVB-induced apoptosis of human keratinocyte HaCaT cells

Exposure of human keratinocyte HaCaT cells to ultraviolet B-irradiation induced apoptotic morphologic changes. In this study, we found that the ultraviolet B irradiation (0.25 J per cm2) induced phosphorylation of p38 mitogen-activated protein kinase and c-jun N-terminal protein kinase, and also significant activation of caspase-3 (CPP32-like protease) and a small increase of caspase-1 (ICE-like protease) activity in the early stages of ultraviolet B-induced apoptosis. Pretreatments of the cells with a p38 mitogen-activated protein kinase inhibitor, SB203580, and a caspase-3 inhibitor, Ac-Asp-Met-Gln-Asp-1-aldehyde, suppressed the ultraviolet B irradiation-induced apoptosis by approximately 60% as estimated by nuclear staining and DNA laddering. Pretreatment with caspase-1 inhibitor, Ac-Tyr-Val-Lys-Asp-aldehyde was without effect. Ultraviolet B-induced caspase-3 activation resulted in cleavage of poly(ADP) ribose polymerase, which was abolished by the caspase-3 inhibitor. SB203580 pretreatment prevented activation of caspase-3 and caspase-1, and also suppressed the cleavage of poly(ADP) ribose polymerase. Neither ceramide generation nor sphingomyelinase activation (neutral and acid) was observed in the ultraviolet B-irradiated HaCaT cells. Also various antioxidants did not affect the caspase activation induced by ultraviolet B irradiation. These results indicated that activation of p38 mitogen-activated protein kinase upstream of caspases may play an important part in the apoptotic process of keratinocytes exposed to ultraviolet B irradiation.     

Differential phosphorylation of mitogen-activated protein kinase families by epidermal growth factor and ultraviolet B irradiation in SV40-transformed human keratinocytes

SV-40 transformed human keratinocytes (SVHK cells) were stimulated with epidermal growth factor (EGF) and ultraviolet B (UVB) irradiation. Following the stimulation, cell growth, apoptosis, and the activities of mitogen-activated protein (MAP) kinase families were analyzed. EGF (100 ng/ml) increased SVHK cell number compared with control cells cultured in serum-free DMEM medium. The EGF-stimulated cells did not show DNA fragmentation. In contrast, UVB irradiation (40 mJ/cm(2)) markedly decreased viable cell number that was accompanied with DNA fragmentation. EGF stimulated extracellular signal-regulated kinase (ERK) and stress-activated protein kinase/c-Jun N-terminal kinase (JNK). Following the EGF stimulation, phosphorylated ERK and JNK were detected by phospho-p42/44 MAP kinase antibody and phospho-SAPK/JNK antibody, respectively. On the other hand, UVB irradiation stimulated the phosphorylation of p38 and JNK but not of ERK. The stimulation of ERK and JNK induced by EGF was observed earlier than the stimulation of p38 and JNK induced by UVB. PD98059, a specific MAP kinase kinase (MAPKK) 1 (also referred to as MEK1) inhibitor, inhibited EGF-dependent cell proliferation, that was associated with the inhibition of ERK and JNK phosphorylation. In contrast, UVB-induced overall cell death was not significantly affected by PD98059, that inhibited phosphorylation of JNK but not of p38. PD98059, however, significantly augmented UVB-induced cell death earlier time points (30 min--2 h). These results indicate that ERK and JNK are activated following EGF stimulation that might be associated with cell proliferation. On the other hand, UVB-induced apoptosis seems to be mostly associated with the activation of p38. JNK stimulation might provide an anti-apoptotic tonus during the UVB-induced, p38-associated SVHK cell death.     

Erythroid differentiation regulator 1 (Erdr1) is a proapototic factor in human keratinocytes

Skin is constantly exposed to physical and chemical stressors. The exposure of keratinocytes to ultraviolet B (UVB) irradiation causes epidermal damage via induction of apoptosis. Erythroid differentiation regulator 1 (Erdr1) modulates growth and survival of cells under various stressful conditions, but the function of Erdr1 in human keratinocyte apoptosis has not been investigated so far. Here, we investigated the effect of Erdr1 on UVB-induced apoptosis in human keratinocytes and also examined the underlying regulatory mechanism. First, Erdr1 expression was detected in human primary keratinocytes and normal human skin tissues. Expression of Erdr1 was enhanced in human keratinocytes following UVB irradiation. Knock-down of Erdr1 led to resistance to UVB-induced apoptosis. Also, Erdr1 overexpression increased UVB-induced apoptosis and induced caspase-3 activation. Furthermore, the extracellular signal-regulated kinase (ERK) inhibitor PD98059 and the p38 mitogen-activated protein kinase (MAPK) inhibitor SB203580 significantly reduced Erdr1 expression following UVB irradiation. These results indicate that UVB induces Erdr1 via a MAPK-dependent mechanism. Taken together, these findings suggest that Erdr1 has a role as a proapoptotic factor in human keratinocytes and acts via ERK and p38 MAPK pathways. Therefore, Erdr1 may be a potential therapeutic target to reduce apoptosis in keratinocytes in conditions such as psoriasis and skin cancer.     

Role of protein kinase C delta in X-ray-induced apoptosis of keratinocyte

Abstract:  In this study, we investigated the process of X-ray-induced apoptosis of skin keratinocyte, and the functional role of protein kinase C delta (PKCδ) and downstream signalling cascade. High-dose X-ray irradiation (10 Gy) led to the apoptosis of HaCaT keratinocyte, accompanied by PKCδ cleavage. Treatment with PKCδ inhibitor and adenoviral transduction of dominant-negative PKCδ clearly inhibited the X-ray-induced apoptosis of keratinocyte. In addition, X-ray induced the phosphorylation of extracellular signal-regulated kinases 1/2 (ERK1/2) and inhibition by ERK1/2 inhibitor abrogated the X-ray-induced apoptosis. Interestingly, overexpression of dominant-negative PKCδ markedly blocked the X-ray-induced phosphorylation of ERK1/2, suggesting that ERK1/2 is the functional downstream effector of PKCδ. Next, we investigated the difference between UVB and X-ray response. UVB induced the apoptosis of keratinocyte in a PKCδ-dependent manner, similar to X-ray response. However, UVB irradiation induced the phosphorylation of c-jun N-terminal kinases (JNK) and inhibition of JNK significantly protected the UVB-induced apoptosis. These results demonstrate that PKCδ is a key regulator in X-ray-induced apoptosis of keratinocyte and suggest that there is subtle difference in downstream signalling cascade between UVB and X-ray response of keratinocyte.     

黄芪甲苷对HaCaT细胞的光保护效能及其机制

目的 观察黄芪甲苷对于中波紫外线（UVB）损伤的人表皮细胞的保护作用,探讨其相关机制。方法 将培养的永生化人皮肤角质形成细胞（HaCaT细胞）分为对照组、UVB组、黄芪甲苷组和UVB + 黄芪甲苷组,其中UVB组和UVB + 黄芪甲苷组细胞接受50 mJ/cm2 UVB照射,加药组加入不同浓度的黄芪甲苷（10、20、50、100、200 mg/L）进行干预,24 h后CCK8法检测细胞活性。根据CCK8法检测结果选择最佳药物浓度（20 mg/L）进行后继实验。照光后继续培养24 h,流式细胞仪检测细胞内活性氧（ROS）水平,Western印迹法检测HaCaT细胞中p53、p38、基质金属蛋白酶9（MMP-9）和高迁移率族蛋白A1（HMGA-1）的表达。 结果 与对照组相比,10 mg/L和20 mg/L黄芪甲苷组对HaCaT细胞的增殖活性无明显影响（F = 1.32,P > 0.05）,50、100和200 mg/L黄芪甲苷对细胞增殖活性有一定抑制作用（F = 20.20,P < 0.05）;UVB组与对照组比较,HaCaT细胞增殖活性显著下降（F = 99.00,P < 0.01）。与UVB组相比,UVB + 黄芪甲苷（10 ~ 200 mg/L）组HaCaT细胞增殖活性不同程度升高（F = 19.08,P < 0.01）,其中UVB + 20 mg/L黄芪甲苷组升高程度最高。进一步实验表明,与UVB组相比,UVB + 20 mg/L黄芪甲苷组ROS产生受到明显抑制（t = 21.12,P < 0.01）。Western印迹结果表明,与对照组比较,UVB组p53、p38、MMP-9和HMGA-1蛋白的表达升高（均P < 0.01）,而UVB + 20 mg/L黄芪甲苷组细胞内p53、p38、MMP-9和HMGA-1蛋白的表达水平较UVB组显著降低（P < 0.01）。 结论 黄芪甲苷可有效抑制UVB引起的表皮细胞光损伤。     

七组中药醇提物通过HaCaT细胞对黑素细胞株B10BR增殖和黑素合成的影响

目的 研究黑胡椒等中药醇提物通过角质形成细胞对黑素细胞增殖及黑素合成的间接作用,探讨其外用治疗白癜风的可能机理.方法 选取七组中药的醇提物,其中Ⅰ号:透骨草、浮萍各等份;Ⅱ号:白芷、蛇床子各等份;Ⅲ号:补骨脂;Ⅳ号:黑胡椒;Ⅴ号:黑胡椒、补骨脂各等份;Ⅵ号:女贞子;Ⅶ号:复方卡力孜然酊,加入到HaCaT细胞培养基中,采用ELISA法测定上述中药干预后HaCaT细胞上清液中内皮素-1和碱性成纤维细胞生长因子(bFGF)的含量;MTT法测定经中药干预后HaCaT细胞上清液对水生化黑素细胞株B10BR增殖的影响,多巴氧化法检测酪氨酸酶活性,氧氧化钠裂解法测定黑素含量.结果 Ⅱ号和Ⅴ号中药能明显刺激HaCaT细胞分泌内皮素-1(P<0.01及P<0.05).Ⅲ号、Ⅳ号和Ⅶ号可促进HaCaT细胞分泌bFGF(P<0.01,P<0.05及P<0.05).经各组中药处理后的HaCaT细胞培养上清液,Ⅲ号、Ⅵ号能显著促进B10BR的增殖(P<0.01),Ⅰ号、Ⅱ号和Ⅲ号能明显提高B10BR酪氨酸酶活性(P<0.01);Ⅰ号、Ⅱ号、Ⅵ号、Ⅶ号能明显促进B10BR黑素的合成(P<0.01或<0.05).结论 部分中药醇提物治疗白癜风有效可能与中药促进了角质形成细胞分泌细胞因子、改变表皮的微环境有关.