Polypeptide from Chlamys farreri inhibits UVB-induced apoptosis of HaCaT cells via iNOS/NO and HSP90

Polypeptide from Chlamys farreri(PCF) is a novel marine bioactive product that was isolated from the gonochoric Chinese scallop Chlamys farreri,and was found to be an effective antioxidant in our recent studies.In this study,we investigated the effect of PCF on ultraviolet B(UVB)-induced apoptosis of HaCaT cells and the intracellular signaling pathways involved.Pretreatment with the inducible nitric oxide synthase(iNOS) inhibitor S-methylisothiourea sulfate inhibited UVB-induced apoptosis,indicating that iNOS and NO play important roles in apoptosis.On the other hand,the inhibition of UVB-induced apoptosis in the immortalized keratinocyte(HaCaT) cells by PCF was estimated using a DNA ladder.PCF treatment inhibited UVB-induced iNOS activation,as determined by RT-PCR,NO production,as determined by ESR,and up-regulated heat shock protein(HSP) 90 activation,as determined by Western blotting.Our results indicate that iNOS and NO are involved in UVB-induced apoptosis of HaCaT cells and the protective effect of PCF against UVB irradiation is exerted by suppressing the expression of iNOS,followed by inhibition of NO release and enhanced activation of HSP90.

UVB suppresses PTEN expression by upregulating miR-141 in HaCaT cells

MicroRNAs （miRNAs） are 21 to 24 nucleotide, non-coding RNA molecules that post-transcriptionally regulate the expression of target genes. Ultraviolet B （UVB） radiation has been shown to inhibit phosphatase and tensin homolog deleted on chromosome 10 （PTEN） expression in HaCaT cells through an unknown mechanism. In this study, we investigated whether miR-141 can regulate UVB exposure-mediated inhibition of PTEN expression. Real-time RT-PCR, annexin V/fluorescein isothiocyanate staining, Western blotting and anti-miRNA oligonucleotide transfection were employed in this study. We found that upregulation of miR-141 expression after UVB irradiation was inversely correlated with PTEN expression levels in HaCaT cells. Furthermore, miR-141 expression increased apoptosis, while anti-miR-141 partly restored PTEN expression and reversed the pro-apoptosis effect of UVB. UVB suppresses the expression of PTEN by upregulating miR-141 in HaCaT cells. Therefore, miR-141 is a potential gene therapy target for UVB-induced photodamage.

Effects of Oxymatrine on the NF-kappa B expression of HaCaT cells

Objective： To study the effect of oxymatrine on the expression of nuclear factor-kappa B（NF-K B） of Human benign epidermal keratinocytes line（HaCaT cells）. Methods：HaCaT cells were cultured with different concentration of Oxymatrine（10 μ g/ml, 50 μ g/ ml and 100 μg/ml） for 24 h, then 10.5 mol/L Substance P was added to the cells. After 30 min, NF-K B expression in the cells was observed by immunocytochemistry, NF-K B P65 protein expression was evaluated by Western blot, and the mRNA expression of NF-K B P65 was evaluated by reverse transcription polymerase chain reaction（RT-PCR）. The 10.5 mol/L Substance P and culture medium were added to the Substance P group and control group, respectively. Results：In control group, expression rate of positive cells, the expressions of protein and mRNA of NF-K B were all low. In Substance P group, when 10μ mol/L Substance P was added, the expressions were all increased（P 〈 0.05）. But in Oxymatrine groups, the expression rate of positive cells, the expressions of protein and mRNA were all descended in a concentration-dependent manner（P 〈 0.05 or P 〈 0.01）. Conclusion：Oxymatrine can down-regulate the expression of NF-K B of the HaCaT cells and may play an important role in regulating anti-inflammation and immunity.

Protective Effects of Jin Bai Mei Yan Prescription on Oxidative Damage and Photoaging Induced by Ultraviolet B in HaCaT Cells

Objective Ultraviolet B(UVB)mainly acts on the skin epidermis,causing oxidative damage and apoptosis of keratinocytes.Jin Bai Mei Yan Prescription(JBMYP)comprises a variety of antioxidant traditional Chinese medicines(TCM).In this study,we aimed to evaluate the effects of JBMYP on the oxidative damage induced by UVB in human immortalized epidermal keratinocytes(HaCaT)cells.Methods HaCaT cells were divided into six groups:control group,model(UVB)group,positive(UVB+vitamin E)group,UVB+JBMYP low dose group(160μg/mL),UVB+JBMYP moderate dose group(800μg/mL),and UVB+JBMYP high dose group(1600μg/mL).HaCaT cells were irradiated with UVB and treated with JBMYP for 24 h.Methyl thiazolyl tetrazolium(MTT)assay and real-time unlabeled cell function analyzer were used to assess the cell survival and proliferation rates,respectively.At the same time,the levels of intracellular reactive oxygen species(ROS),lipid peroxide malondialdehyde(MDA),glutathione(GSH),and hydroxyproline(HYP),as well as the activities of antioxidant enzyme superoxide dismutase(SOD)and catalase(CAT)were evaluated using enzyme linked immunosorbent assay(ELISA).Results Compared with the model group,the survival rate of HaCaT cells in each dosage group of JBMYP was significantly improved(P<0.05).Further,JBMYP could promote the proliferation of HaCaT cells,leading to a reduction in the contents of MDA and ROS,and increase in the contents of SOD,CAT,GSH and HYP in HaCaT cells.Conclusions JBMYP has enhanced protective effect on oxidative damage induced by UVB in HaCaT cells.

Effects of different doses of acitretin on FGF10 mRNA transcription and its protein translation in HaCaT cells

Objective： To observe the effects of different doses of acitretin on the transcription of FGF10 mRNA and the translation of FGF10 protein in cultured HaCaT cells. Methods： HaCaT cells were treated with different doses of acitretin for 48 h, then the changes on the transcription of FGF10 mRNA and the translation of FGF10 protein in these cells were detected by immunofluorescence and in situ hybridization assay. Results： Compared with the control group, the transcription of FGF10 mRNA and the translation of FGF10 protein were gradually decreased along with the increasing dose of aeitretin. There were significant differences between different groups （P〈0.01）. Conclusion： Aeitretin could inhibit the transcription of FGF10 mRNA and the translation of FGF10 protein in HaCaT cells. With the dose of aeitretin increased, the stains of both FGF10 mRNA and FGF10 protein in HaCaT cells are reduced.

Effects of Combination of 1,25(OH)_(2)D_(3) and TLR-4 Inhibitor on the Damage to HaCaT Cells Caused by UVB Irradiation

Objective Vitamin D and Toll-like receptor-4(TLR-4)inhibition are involved in the protection of keratinocytes.The effects of combination of 1,25(OH)_(2)D_(3) and TLR-4 inhibitor on the protection of keratinocytes against ultraviolet radiation B(UVB)irradiation remain unclear.This study was undertaken to explore the effects of combination of 1,25(OH)_(2)D_(3) and TAK-242(TLR-4 inhibitor)on the damage to HaCaT cells caused by UVB irradiation.Methods In vitro,HaCaT cells were treated with 1,25(OH)_(2)D_(3) or/and TAK-242 prior to UVB irradiation at the intensity of 20 mJ/cm^(2),then the production of reactive oxygen species(ROS),cell migration,apoptosis of cells,and the expression of oxidative stress,endoplasmic reticulum stress,and apoptosis related proteins were determined.Results Compared with the HaCaT cells treated with 1,25(OH)_(2)D_(3) or TAK-242,the cells treated with both 1,25(OH)_(2)D_(3) and TAK-242 showed,1)significantly lower production of ROS(P<0.05);2)significantly less apoptosis of HaCaT cells(P<0.05);3)significantly lower expression of NF-κB,Caspase-8,Cyto-C,Caspase-3(P<0.05).Conclusion The combination of 1,25(OH)_(2)D_(3) and TAK-242 could produce a better protection for HaCaT cells via inhibiting the oxidative stress,endoplasmic reticulum stress and apoptosis than 1,25(OH)_(2)D_(3) or TAK-242 alone.

Effect of Red <i>Panax ginseng</i>on Mitochondrial Dynamics and Bioenergetics in HaCaT Cells Exposed to Urban Pollutants

Background: Urban air pollution contributes to lung and cardiovascular system dysfunction, making it a major concern for human health. Its impact on skin integrity, associated with increased occurrence of atopic dermatitis, is now recognized, but its cellular mechanisms remain poorly understood. Objective: In the present study we aimed at establishing the impact of urban pollutant on mitochondrial dynamics and bioenergetics using the HaCaT cell model. We also sought to establish the protective effect of ECH-5195 (red Panax ginseng extract), standardized in ginsenosides, in reversing pollution-induced mitochondrial defects. Methods: Urban pollution exposure was mimicked by 1 h exposure of HaCaT cells with standardized atmospheric particulate matter containing PAHs, nitro-PAHs, PCB congeners, and chlorinated pesticides with a mean particulate diameter of 5.85 μm (SRM1648). Results: The presence of urban pollutant in the cultures increased the prevalence of hyperfission by 1.41-fold (p = 0.023) and fission by 1.35 fold (p = 0.006) in the reticular mitochondrial network. ECH-5195 reduced both pollution-induced hyperfission by 0.54-fold (p = 0.004) and fission by 0.68-fold (p = 0.0006) normalizing the mitochondrial reticular network. Pollution exposure was associated with a significant reduction of basal OCR and increased lactate production, pushing the cell to rely on glycolysis for ATP production. When ECH-5195 was used, OCR was significantly increased, and the glycolytic contribution to ATP production was reduced while both oxidative phosphorylation and mitochondrial respiration were increased demonstrating mitochondrial re-engagement in ATP production. Conclusions: Pollution exposure was disruptive for both the mitochondrial network dynamics and mitochondrial respiration. Ginsenosides in ECH-5195 efficiently protected both from pollution-induced defects.

Research method of psoriasis based on HaCaT cells

Psoriasis is a chronic,refractory,inflammatory skin disease that occurs in young adults.The traditional animal model cannot simulate the skin characteristics of patients with psoriasis effectively,so it is difficult to be used for in-depth study of psoriasis mechanism.Immortalized human epidermal cells(HaCaT) is a non-tumor,immortalized human epidermal cell which is widely used in the study of dermatosis.HaCaT cells are the best choice for the study of psoriasis mechanism because their immu.nological characteristics and reproductive ability are coincide with the pathological features of psoriasis.This article reviews the specific methods such as establishment of cell method,cytokine and chemo.kine analysisin the pathogenesis study of psoriasis based on HaCaT cells,hoping to provide some thoughts for drug′s pharmacological activity research.

Effect of mitomycin on normal dermal fibroblast and HaCat cell:an in vitro study

Objective:To evaluate the effects of mitomycin on the growth of human dermal fibroblast and immortalized human keratinocyte line (HaCat cell),particularly the effect of mitomycin on intracellular messenger RNA (mRNA) synthesis of collagen and growth factors of fibroblast.Methods:The normal dermal fibroblast and HaCat cell were cultured in vitro.Cell cultures were exposed to 0.4 and 0.04 mg/ml of mitomycin solution,and serum-free culture medium was used as control.The cellular morphology change,growth characteristics,cell proliferation,and apoptosis were observed at different intervals.For the fibroblasts,the mRNA expression changes of transforming growth factor (TGF)-β1,basic fibroblast growth factor (bFGF),procollagen Ⅰ,and Ⅲ were detected by reverse transcription polymerase chain reaction (RT-PCR).Results:The cultured normal human skin fibroblast and HaCat cell grew exponentially.A 5-min exposure to mitomycin at either 0.4 or 0.04 mg/ml caused marked dose-dependent cell proliferation inhibition on both fibroblasts and HaCat cells.Cell morphology changed,cell density decreased,and the growth curves were without an exponential phase.The fibroblast proliferated on the 5th day after the 5-min exposure of mitomycin at 0.04 mg/ml.Meanwhile,5-min application of mitomycin at either 0.04 or 0.4 mg/ml induced fibroblast apoptosis but not necrosis.The apoptosis rate of the fibroblast increased with a higher concentration of mytomycin (p<0.05).A 5-min exposure to mitomycin at 0.4 mg/ml resulted in a marked decrease in the mRNA production of TGF-β1,procollagen Ⅰ and Ⅲ,and a marked increase in the mRNA production of bFGF.Conclusions:Mitomycin can inhibit fibroblast proliferation,induce fibroblast apoptosis,and regulate intracellular protein expression on mRNA levels.In additon,mitomycin can inhibit HaCat cell proliferation,so epithelial cell needs more protecting to avoid mitomycin's side effect when it is applied clinically.

槐提取物和维生素C组合物对紫外照射诱导的HaCaT细胞光损伤的保护作用

本研究旨在探讨槐提取物和维生素C(Vitamin C,V_(C))对紫外线照射引起的HaCaT细胞光损伤的保护作用。通过体外培养HaCaT细胞并将其分为不同组别:对照组(未接受紫外辐照,无槐提取物、V_(C)或二者组合物处理)、紫外线辐射组、125μg/mL槐提取物(接受紫外辐照及槐提取物处理)、125μg/mL维生素C(接受紫外辐照及维生素C处理)以及125μg/mL组合物组(接受紫外辐照及组合物处理,槐提取物和V_(C)质量比为1:1)。采用荧光染色和酶标仪检测技术来评估槐提取物、V_(C)及二者组合物对紫外照射引起的HaCaT细胞产生的活性氧物质(ROS)和线粒体ROS的抑制率。利用免疫荧光染色和酶联免疫吸附法检测槐提取物、V_(C)和组合物对紫外照射引起的HaCaT细胞中环丁烷嘧啶二聚体(Cyclobutane pyrimidine dimers,CPDs)和细胞炎症因子IL-6的表达水平。结果显示,槐提取物、V_(C)和组合物对UVA处理后HaCaT细胞生成的总ROS抑制率分别为38.23%±9.23%、27.20%±6.87%及64.13%±4.08%,与单独使用槐提取物或V_(C)处理相比,组合物显著提高总ROS抑制率(P<0.01)。槐提取物、V_(C)和组合物对线粒体ROS(Mitochondrial DNA,mtROS)的抑制率分别为50.29%±4.92%、38.81%±8.66%及84.74%±3.68%,与单独使用槐提取物或V_(C)处理相比,组合物极显著提高mtROS抑制率(P<0.01)。此外,在UVB照射后,槐提取物、V_(C)及组合物可极显著减少CPDs的生成(P<0.01),这种效应在组合物组效果更为显著(与槐提取物组比较P<0.05;与V_(C)组比较P<0.01)。同时,槐提取物和组合物显著降低UVA照射后炎症因子IL-6的分泌(P<0.01;P<0.05),表明槐提取物及组合物具有抗炎作用。本研究结果表明槐提取物和维生素C组合物能减轻紫外线引起的氧化应激损伤和炎症反应,为未来体内研究和开发具有健康益处的槐提取物和V_(C)组合物提供实验支持。

Bioeffects of different functionalized silica nano-particles on HaCaT cell line

The bioeffects of silica nanoparticles (SiNP), phosphorylate-terminated nanoparticles (PO4- NP) and amino-terminated nanoparticles (NH2NP) on HaCaT cell line have been studied in this paper. The effects of the three kinds of functionalized silica nanoparticles on adherence, proliferation and cycle of HaCaT cells have been investigated. And the cel- lular uptake of the three kinds of functionalized silica nanoparticles by HaCaT cells has also been exam- ined. Results indicated that the bioeffects of the three kinds of functionalized nanoparticles on HaCaT cells were concentration-dependent. And the three kinds of functionalized nanoparticles all exhibited well bio- compatibility if the concentration was below 0.2 μg/μL. While the cytotoxicities of the three kinds of function- alized nanoparticles on HaCaT cells would increase with the increasing of nanoparticles concentration, and the following order was observed: NH2NP > SiNP > PO4NP. In addition, the quantity and rapidity of cellular uptake of nanoparticles by HaCaT cells were diverse due to the different functional groups. Under the same conditions, NH2NP was most and fast internalized by HaCaT cells, followed by SiNP, and PO4NP was the least and slowest. These results provided theoretical foundation for the safe applica- tion and further modification of silica nanoparticles, which could broaden the application of silica nano- particles in biomedicine.

荔枝发酵物提高人体皮肤HaCat细胞的抗氧化能力及对细胞凋亡的修复作用

该文研究了荔枝发酵物对人体皮肤HaCat细胞模型中的ROS、SOD、透明质酸和水通道蛋白AQP3生成,以及对细胞周期与细胞凋亡的影响。结果表明,在双氧水诱导的HaCat细胞模型中,中剂量和高剂量组的ROS生成抑制率达到50%以上;所有剂量组均显著提升SOD活力水平(P<0.05),高剂量组相比模型组提高39.96%,与空白对照组水平一致(P>0.05)。在HaCat细胞干燥模型中,所有剂量组荔枝发酵物均显著提升水通道蛋白AQP3和透明质酸的表达水平,高剂量组相比模型组分别提高2.08倍和1.11倍;荔枝发酵物能够调节HaCat细胞由G0/G1期比例向S期和G2/M期转化(P<0.01),且能够显著降低由UVA照射导致的HaCat人体皮肤细胞的凋亡率(P<0.05)。因此,荔枝发酵物能有效提升HaCat细胞的抗氧化能力,促进细胞分裂,修复UVA导致的细胞凋亡,为其在皮肤健康产品研究和应用提供了参考。

PIEZO1影响HaCaT细胞的趋电性迁移

目的伤口中心产生的内源性电场是指导细胞定向迁移促进伤口愈合的重要因子。PIEZO1是机械门控阳离子通道家族成员之一,它参与细胞迁移,影响细胞的趋化迁移,并且受到电压的调节,在伤口愈合过程中发挥重要作用。但PIEZO1是否参与影响电场指导的细胞定向迁移过程尚不清晰,本文以HaCaT细胞为模型探讨PIEZO1及其下游相关蛋白质对细胞趋电性迁移的影响。方法应用活细胞工作站追踪HaCaT细胞在微直流电场中的迁移,使用抑制剂及RNAi技术调控PIEZO1功能和表达,研究PIEZO1对于细胞趋电性迁移的影响;用蛋白质印迹(Western blot)检验细胞的整合素(integrin)β1与FAK磷酸化水平在电场作用下的变化情况,探讨PIEZO1与integrinβ1及FAK等对电场信号的响应及细胞趋电性迁移的影响。结果PIEZO1广谱抑制剂钌红、GsMTx4和RNAi处理显著抑制了HaCaT细胞向正极趋电性迁移的能力;电场和GsMTx4单独作用升高FAK磷酸化和integrinβ1表达,GsMTx4阻止电场进一步升高FAK的磷酸化水平和integrinβ1表达;siRNA干扰PIEZO1表达后显著下调FAK的磷酸化水平,并且电场对FAK磷酸化和integrinβ1表达的促进作用受到抑制;Integrinβ1和FAK的抑制剂使HaCaT细胞的趋电性迁移能力均显著降低。结论PIEZO1参与HaCaT细胞的趋电性迁移,是影响HaCaT细胞趋电性迁移的重要分子之一;抑制integrinβ1和FAK会影响HaCaT细胞的电性迁移;电场信号可能通过PIEZO1介导的信号通路调控integrinβ1的表达和FAK的活化进而影响细胞趋电性迁移。

牡丹籽乙醇提取物对UVB诱导HaCaT细胞光老化的保护作用及机制研究

目的:研究牡丹籽乙醇提取物对UVB诱导人永生化角质形成细胞(HaCaT)光老化的保护作用及机制。方法:通过超高效液相色谱-四级杆飞行时间质谱(UPLC-Q-TOF-MS)法分析牡丹籽乙醇提取物存在的抗光老化活性成分,采用UVB刺激HaCaT细胞建立光老化细胞模型,噻唑蓝比色(MTT)法测定细胞活力,细胞划痕法检测牡丹籽乙醇提取物对细胞迁移能力的影响,通过酶联免疫吸附试验(ELISA)检测影响衰老的白细胞介素-1(Interleukin-1,IL-1)、白细胞介素-6(Interleukin-6,IL-6)、白细胞介素-22(Interleukin-22,IL-22)、干扰素-γ(Interferon-γ,IFN-γ)和转化生长因子-β(Tansforming growth factor-β,TGF-β)等细胞因子,以活性氧(Reactive oxygen species,ROS)和核因子-κB(Nuclear factor-κB,NF-κB)的水平为指标,研究不同浓度的牡丹籽乙醇提取物对HaCaT细胞的抗光老化活性及其机制。结果:含量最多的前五种成分为单硬脂酸甘油酯(10.73%)、芥酸酰胺(3.17%)、5-[(2R,3S)-6-羟基-2-(4-羟基苯基)-4-[(E)-2-(4-羟基苯基)乙烯基]-2,3-二氢1-苯并呋喃-3-基]苯-1,3-二醇(2.20%)、α,α-海藻糖(1.90%)和芍药内酯苷(1.45%)。经不同浓度牡丹籽乙醇提取物处理后的HaCaT细胞活力均在80%以上,其中浓度为6.25μg/mL的牡丹籽乙醇提取物对HaCaT细胞无显著毒性,并且浓度为12.5μg/mL(H组)和6.25μg/mL(L组)的牡丹籽乙醇提取物均能抑制HaCaT细胞的迁移能力,H组能显著降低细胞IL-1、IL-6、IL-22、IFN-γ和TGF-β水平(P<0.05)从而抵抗皮肤衰老,L组能减少ROS产生,降低NF-κB蛋白因子的含量(P<0.05),从而有效地抑制HaCaT细胞的光老化反应。结论:牡丹籽乙醇提取物具有抗光老化作用,可以改善UVB诱导的氧化应激和炎症反应。

长链非编码RNANEAT1对HaCaT细胞中miR-485-5p和STAT3表达的影响

目的:探讨LncRNA NEAT1对HaCaT细胞中miR-485-5p和STAT3表达的调控及对HaCaT细胞增殖、凋亡的影响。方法:采用PCR、Western印迹法检测HaCat细胞和正常人表皮角质形成细胞(NHEK细胞)中LncRNANEAT1、miR-485-5p及STAT3 mRNA和蛋白表达情况。荧光原位杂交技术(FISH)和双荧光素酶报告基因检测LncRNA NEAT1、miR-485-5p和STAT3之间的靶向调控关系。再通过RNA干扰技术分别沉默HaCat细胞中LncRNANEAT1、STAT3表达,以及转染miR-485-5p模拟剂(mimic)和抑制剂(inhibitor)分别上、下调miR-485-5p,然后应用PCR、Western Blot、流式细胞术、CCK8等实验技术分别检测LncRNANEAT1、miR-485-5p、STAT3表达及细胞增殖、凋亡情况。结果:与NHEK细胞组相比,LncRNA NEAT1和STAT3在HaCaT细胞组中高表达,而miR-485-5p在HaCaT细胞中低表达;miR-485-5p与LncRNA NEAT1共定位于HaCaT细胞质,且miR-485-5p与LncRNA NEAT1 3′-UTR、STAT3 3′-UTR之间存在互补结合序列;共转染转野生型psiCHECK-LncRNA NEAT1-3′UTR-WT、psiCHECK-STAT3-3′UTR-WT重组质粒时,miR-485-5pmimic组相对萤光素酶活性明显低于miR-NC组。而共转染突变型psiCHECK-LncRNANEAT1-3′UTR-MUT、psiCHECK-STAT3-3′UTR-MUT重组载体质粒时,miR-485-5p mimic组和miR-NC组萤光素酶活性无明显差异;沉默LncRNA NEAT1或STAT3均可抑制HaCaT细胞增殖及促进其凋亡;下调miR-485-5p可促进HaCaT细胞增殖及抑制其凋亡,而上调miR-485-5p则与之相反;下调miR-485-5p可减弱沉默LncRNANEAT1对HaCaT细胞功能的影响。结论:LncRNANEAT1可通过充当竞争性内源RNA(competing endogenous RNA,ceRNA)吸附miR-485-5p增强STAT3表达来促进HaCaT细胞增殖并抑制其凋亡。

黑枸杞花青素、EGCG对中波紫外线诱导HaCaT细胞氧化损伤的协同保护作用

该研究探讨黑枸杞花青素(BWA)、表没食子儿茶素没食子酸酯(EGCG)的体外抗氧化能力并通过构建中波紫外线(UVB)诱导永生化人角质(HaCaT)细胞氧化损伤模型考察两者复配物对细胞氧化损伤的协同保护作用。体外抗氧化实验表明BWA、EGCG对DPPH自由基、羟自由基均具较强的清除能力和铁离子还原能力。通过Isobologram分析得出在药物安全剂量范围内,不同比例组合物对受损细胞的保护作用均优于单一物质(P<0.05),其中质量比6:4(BWA:EGCG)复配物具最强协同保护作用,协同率达17.08%,受损细胞存活率达89.71%。相较于模型组,6:4复配物使细胞内过氧化氢酶(CAT)、超氧化物歧化酶(SOD)和谷胱甘肽过氧化物酶(GPX)活性分别增强2.66、1.91、2.33倍,丙二醛(MDA)含量水平降低40%(P<0.05)。结果表明BWA、EGCG均具强体外抗氧化能力,两者复配物对细胞氧化损伤具协同保护作用,其机制可能通过增强细胞中抗氧化酶活性从而减轻UVB对HaCaT细胞的氧化损伤实现,可为黑枸杞花青素与EGCG组合物的开发和应用提供理论参考及实验支撑。

紫铆花素对人黑色素瘤细胞A375与人永生化角质形成细胞HaCaT共培养细胞生物学活性的影响

目的探讨紫铆花素对人黑色素瘤细胞A375与人永生化角质形成细胞HaCaT共培养细胞生物学活性的影响。方法建立A375细胞与HaCaT细胞的共培养细胞体系,实验分为对照组(等体积培养液),紫铆花素低、中、高剂量组(以下简称低、中、高剂量组,0.5,1.0,5.0μg/L)。采用四甲基偶氮噻唑蓝(MTT)法检测细胞活性;采用流式细胞仪检测细胞的周期分布和线粒体膜电位;采用实时荧光定量聚合酶链反应(qPCR)法检测干细胞因子(SCF)和其受体c-Kit,以及小眼畸形相关转录因子(MITF)的mRNA表达水平;采用Western blot法检测细胞酪氨酸酶相关蛋白1,2(TRP-1,TRP-2)及SCF,c-Kit,MITF的蛋白表达水平。结果与对照组比较,中、高剂量组细胞的增殖率均显著升高(P<0.01);与对照组比较,各剂量组G0/G1期细胞比例均显著降低,S期和G_(2)/M期细胞比例均显著升高(P<0.01),高线粒体膜电位细胞比例均显著升高(P<0.05或P<0.01),SCF,c-Kit,MITF的mRNA表达水平及SCF,c-Kit,MITF,TRP-1,TRP-2的蛋白表达水平均显著升高(P<0.05或P<0.01)。结论紫铆花素可能通过调节SCF,cKit,MITF的表达而影响A375细胞与HaCaT细胞共培养细胞的增殖、细胞周期和线粒体膜电位等细胞生物学活性。

牙髓干细胞条件培养基联合LDH纳米材料抗HaCaT细胞光老化的作用研究

目的 探究牙髓干细胞条件培养基(DPSCs-CM)联合层状双金属氢氧化物(LDH)纳米材料对光老化HaCaT细胞的作用。方法 制备DPSCs-CM并合成LDH纳米材料。设置对照组[无预处理,无中波紫外线(UVB)照射]、模型组(无预处理,予UVB照射)、DPSCs-CM组(用含DPSCs-CM的DMEM完全培养基预处理24 h后进行UVB照射)、LDH组(用含LDH的DMEM完全培养基预处理24 h后进行UVB照射)和DPSCs-CM+LDH组(用含有等比混合的DPSCs-CM和LDH的DMEM完全培养基预处理24 h后进行UVB照射)。检测各组HaCaT细胞的丙二醛(MDA)含量、超氧化物歧化酶(SOD)活力以及活性氧(ROS)水平。采用细胞划痕实验检测各组HaCaT细胞的迁移能力。采用Western blot法检测各组HaCaT细胞中p53蛋白和p16蛋白的表达水平。结果 LDH纳米材料的平均粒径为65.52 nm,分散度系数(PDI)为0.109,Zeta电位为38.1 mV,表明LDH纳米材料的细胞毒性较低,纳米粒子粒径分布均一,分散性和稳定性良好。与模型组相比,DPSCs-CM组、LDH组和DPSCs-CM+LDH组HaCaT细胞的ROS水平和MDA含量降低,SOD活力升高,细胞迁移能力提高,细胞内p53蛋白和p16蛋白表达水平降低,差异有统计学意义(P<0.05),且以DPSCs-CM+LDH组的干预效果最佳。结论 DPSCs-CM联合LDH纳米材料预处理可有效抗HaCaT细胞光老化,其效果优于单一DPSCs-CM和LDH纳米材料干预,为皮肤光老化治疗方法的研发提供了参考。

二甲双胍通过NLRP3炎症小体通路对皮肤角质形成细胞增殖和凋亡的双向调节研究

背景扁平苔藓是一种皮肤-黏膜慢性炎症性疾病。因其病因不明,许多患者治疗效果欠佳,严重影响生活质量,有必要深入研究扁平苔藓的发病机制,为其药物筛选提供新靶点。目的探讨二甲双胍通过NLRP3炎症小体通路对皮肤角质形成细胞增殖和凋亡的调控作用。方法实验时间为2020—2023年。体外实验以人永生化角质形成细胞株HaCaT为研究对象,分为4组:对照组、脂多糖(LPS)组(5μg/mL)、二甲双胍组(Met组:10 mmol/L)、LPS与二甲双胍联合组(LPS+Met组:LPS 5μg/mL刺激2 h后,再给予二甲双胍10 mmol/L处理)。体内实验以BALB/c小鼠为研究对象,利用咪喹莫特涂抹小鼠背部皮肤诱导了银屑病样皮炎模型,并制备了二甲双胍乳膏进行治疗,将小鼠随机分为3组:对照组、咪喹莫特组(IMQ组)、咪喹莫特与二甲双胍联合组(IMQ+Met组),每组10只;对照组小鼠于背部涂抹凡士林,IMQ组小鼠于背部涂抹咪喹莫特软膏,IMQ+Met组小鼠于背部涂抹IMQ软膏12 h后再涂抹二甲双胍乳膏;1次/d,连续7 d。采用细胞增殖试剂盒(CCK-8)和流式细胞术检测二甲双胍对HaCaT细胞增殖和凋亡的影响;采用Western Blotting、酶联免疫吸附实验(ELISA)和半胱氨酸天冬氨酸蛋白酶1(Caspase-1)活性实验检测二甲双胍处理HaCaT细胞后NOD样受体蛋白3(NLRP3)炎症小体通路的蛋白表达情况及活性水平;最后采用皮肤组织切片苏木素-伊红(HE)染色和免疫组化检测二甲双胍对咪喹莫特诱导银屑病小鼠皮炎的抗炎效果。结果CCK-8实验结果显示:LPS组、Met组、LPS+Met组HaCaT细胞48 h存活率均低于对照组,而LPS+Met组HaCaT细胞48 h存活率高于LPS组(P<0.05)。流式细胞术结果显示:LPS组、Met组HaCaT细胞48 h G2/M期细胞、细胞凋亡比例均高于对照组,而LPS+Met组HaCaT细胞48 h G2/M期细胞、细胞凋亡比例低于LPS组(P<0.05)。Western Blotting结果显示:LPS组、Met组HaCaT细胞NLRP3炎症小体通路Caspase-1 p40、Caspase-1 p20、白介素(IL)-1β、IL-18蛋白表达均高于对照组,而LPS+Met组HaCaT细胞NLRP3炎症小体通路Caspase-1 p40、Caspase-1 p20、IL-1β、IL-18蛋白表达低于LPS组(P<0.05)。ELISA实验结果显示:LPS组、Met组HaCaT细胞NLRP3炎症小体通路IL-1β、IL-18水平、Caspase-1相对活性均高于对照组,而LPS+Met组HaCaT细胞NLRP3炎症小体通路IL-1β、IL-18水平、Caspase-1相对活性低于LPS组(P<0.05)。皮肤组织切片HE染色显示:IMQ+Met组小鼠二甲双胍涂抹明显改善了咪喹莫特对皮肤的损害。免疫组化结果显示:IMQ+Met组小鼠则显著降低了NLRP3、Caspase-1、IL-1β和IL-18的表达。结论二甲双胍通过NLRP3炎症小体通路双向调节皮肤角质形成细胞的增殖和凋亡,并能够改善咪喹莫特诱导的银屑病样小鼠的皮肤损害,有望为二甲双胍临床上用于治疗扁平苔藓提供理论依据。

五味子乙素对UVB辐射诱导HaCat细胞凋亡的抑制作用及其机制

目的研究五味子乙素(SchB)对中波紫外线(ultraviolet radiation b,UVB)辐射诱导人表皮角质永生化细胞(HaCat)凋亡的抑制及其作用。方法 MTT法检测五味子乙素(SchB)对UVB辐射诱导HaCat细胞凋亡的抑制作用;Hoechst染色检测细胞凋亡;RT-PCR检测SchB对HaCaT基因表达的影响。结果 SchB对HaCaT细胞生长未显示出抑制作用,且可以抑制由UVB辐射引起的细胞凋亡,并降低了UVB诱导的p53、p21、Caspase-3等与凋亡有关基因的表达。结论 SchB可通过降低紫外线辐射后细胞的凋亡基因的表达从而抑制UVB对皮肤细胞的损伤,发挥其抗光老化作用。