Chicken collagen hydrolysates differentially mediate anti-inflammatory activity and type I collagen synthesis on human dermal fibroblasts

Collagen is a major extracellular matrix protein.Given the potential anti-inflammatory and antioxidant profiles of these bioactive compounds,there has been increasing interest in using collagen derived peptides and peptide-rich collagen hydrolysates for skin health,due to their immunomodulatory,antioxidant and proliferative effects on dermal fibroblasts.However,all hydrolysates are not equally effective in exerting the beneficial effects;hence,further research is needed to determine the factors that improve the therapeutic applicability of such preparations.We used different enzymatic conditions to generate a number of different collagen hydrolysates with distinct peptide profiles.We found that the use of two rather than one enzyme for hydrolysis generates a greater abundance of low molecular weight peptides with consequent improvement in bioactive properties.Testing these hydrolysates on human dermal fibroblasts showed distinct actions on inflammatory changes,oxidative stress,type I collagen synthesis and cellular proliferation.Our findings suggest that different enzymatic conditions affect the peptide profile of hydrolysates and differentially regulate their biological activities and potential protective responses on dermal fibroblasts.

The Polypeptide in Chlamys farreri can protect human dermal fibroblasts from ultraviolet B damage

To investigate the effect of polypeptide from Chlamys farreri (PCF) on NHDF in vitro, we modeled oxidative damage on normal human dermal fibroblasts (NHDF) exposed to ultraviolet B (UVB). In this study, 3-[4,5-Dimethylthiazol-2-yl]-2,5-diphenyltetrazolium bromide (MTT) and lactate dehydro-genase (LDH) were tested to measure cell viability. Enzymes including superoxide dismutase (SOD), glu-tathione peroxidase (GSH-PX), catalase (CAT) and xanthine oxidase (XOD) were determined biochemically. Total antioxidative capacity (T-AOC) and anti-superoxide anion capacity (A-SAC) were also determined. Ultrastructure of fibroblasts was observed under transmission electron microscope. The results showed that: UVB (1.176×10-4 J/cm2) suppressed the growth of fibroblasts and the introduction of PCF (0.25%-l%) before UVB reduced the suppression in a concentration-dependent manner. PCF could enhance the activities of SOD, GSH-PX and T-AOC as well as A-SAC. Also PCF could inhibit XOD activity, while it did not affect CAT activity. Ultrastructure of fibroblasts were damaged after UVB irradiation, concentration-dependent PCF reduced the destructive effect of UVB on cells. These results indicated that PCF can protect human dermal fibroblasts from being harmed by UVB irradiation via its antioxidant pro-erty.

Anti-senescence and anti-wrinkle activities of 3-bromo-4,5-dihydroxybenzaldehyde from Polysiphonia morrowii Harvey in human dermal fibroblasts

Objective:To investigate the anti-senescence effect of 3-bromo-4,5-dihydroxybenzaldehyde(BDB)from Polysiphonia morrowii Harvey in human dermal fibroblasts(HDF).Methods:HDF were subjected to treatment of BDB and then treated with hydrogen peroxide(H2O2)to induce premature senescence.Senescence-associatedβ-galactosidase(SA-β-gal)activity in HDF was determined using the SA-β-gal staining method.Intracellular reactive oxygen species(ROS)production was measured using the 2’,7’-dichlorodihydrofluorescein diacetate assay.Western blotting assay was performed to assess the level of antioxidant enzyme glutathione peroxidase 1(GPX1).In addition,intracellular collagen and collagenase contents were analyzed using the respective ELISA kits.Elastase activity in HDF supernatants was measured from p-nitroaniline release and normalized using total protein content.Results:Treatment of HDF with H2O2 increased the activity of SA-β-gal,but BDB pre-treatment resulted in the reduction of SA-β-gal activity.Moreover,BDB significantly reduced H2O2-induced intracellular ROS production.BDB also markedly increased the level of GPX1,which was inhibited by 400μM of H2O2.Furthermore,in in vitro study,BDB significantly increased intracellular collagen content and decreased matrix metalloproteinase-1 and elastase activities in HDF.Conclusions:Our results demonstrate that BDB shows antisenescence and anti-wrinkle activities in vitro.

9-Hydroxy-6,7-dimethoxydalbergiquinol suppresses hydrogen peroxide-induced senescence in human dermal fibroblasts through induction of sirtuin-1 expression

Objective:To investigate the potential anti-aging mechanism of9-hydroxy-6,7-dimethoxydalbergiquinol(HDDQ)on hydrogen peroxide(H2O2)-induced oxidative stress in human dermal fibroblasts(HDFs).Methods:The effect of HDDQ on cell viability was assessed by MTT assay,and the effects of HDDQ on senescence-like phenotypes were determined by senescence-associatedβ-galactosidase(SA-β-gal)staining,Western blotting analysis,and a cell proliferation assay.The expression level and activity of sirtuin-1(SIRT1)induced by HDDQ were also measured.Results:HDDQ reversed senescence-like phenotypes in the oxidant-challenged model,through reducing SA-β-gal activity and promoting cell growth.Meanwhile,decreases in ac-p53,p21Cip1/WAF1,and p16Ink4a and an increase in p Rb were observed.HDDQ induced the expression of SIRT1 in a concentration-and time-dependent manner.Moreover,HDDQ inhibited H2O2-induced phosphorylation of Akt by SIRT1 up-regulation and reduced SA-β-gal staining.Conclusions:HDDQ inhibits H2O2-induced premature senescence and upregulation of SIRT1 expression plays a vital role in the inhibition of the senescence phenotype in HDFs.

Effect of a Nutrient Mixture on Fanconi Anemia Fibroblast and Normal Human Dermal Fibroblast: A Comparison

Fanconi anemia (FA) is a fatal heterogeneous autosomal recessive disorder, characterized by progressive bone marrow failure, congenital defect and cancer predisposition. Cell culture from FA fibroblast (FAF) displays certain abnormalities as compared to normal human dermal fibroblast (NHDF). This prompted us to investigate the effect of a specific nutrient mixture (NM) containing ascorbic acid, lysine, proline and green tea extract, which has demonstrated a broad spectrum of pharmacological activities, on FAF compared to NHDF. We investigated the in vitro effect of NM on FAF and NHDF cell proliferation by MTT assay, MMPs secretion by zymography, morphology by H&E staining and apoptosis by green caspase assay. FAF (FA-A: PD20, FA-A: PD220) and NHDF were cultured in modified Dulbecco Eagle media. At near confluence, the cells were treated with different concentrations of NM (0, 50, 100, 250, 500 and 1000 μg/ml) in triplicate. The cells were also treated with PMA to induce MMP-9 activity. NM had no effect on FAF cell viability in both cell lines compared to control. In contrast NM exhibited 20% at 50 and 100, 50% at 250, 60% at 500 and 70% toxicity at 1000 μg/ml on NHDF cells. Zymography demonstrated MMP-2 and MMP-9 on PMA stimulation in FAF and NM inhibited the activity of both MMP-2 and MMP-9 in a dose response fashion with total block at 500 μg/ml. In contrast, NHDF exhibited only MMP-2, both active and inactive forms, and NM inhibited their activities in a dose-dependent manner with total block at 1000 μg/ml. H&E staining did not indicate any morphological changes in FAF nor induced apoptosis at higher concentrations, as seen by caspases assay. However, although no morphological changes in NHDF were noted up to NM 100 μg/ml, progressive changes in cell shrinkage, rounding and nuclear condensation, pertaining to apoptosis, were observed at higher concentrations. These changes were consistent with the results from the green caspases apoptosis assay. Our data demonstrate that NM exhibited different responses toward FAF and NHDF. This may in part be due to elevated chromosomal break, deletion and hypersensitivity to cross linking agents, a DNA repair disorder in FAF that is lacking in NHDF.

Protective effect of oat bran extracts on human dermal fibroblast injury induced by hydrogen peroxide

Oat contains different components that possess antioxidant properties; no study to date has addressed the antioxidant effect of the extract of oat bran on the cellular level. Therefore, the present study focuses on the investi- gation of the protective effect of oat bran extract by enzymatic hydrolysates on human dermal fibroblast injury induced by hydrogen peroxide （H2O2）. Kjeldahl determination, phenol-sulfuric acid method, and high-performance liquid chromatography （HPLC） analysis indicated that the enzymatic products of oat bran contain a protein amount of 71.93%, of which 97.43% are peptides with a molecular range from 438.56 to 1301.01 Da. Assays for 1,1-diphenyl-2-picrylhydrazyl （DPPH） radical scavenging activity indicate that oat peptide-dch extract has a direct and concentration-dependent antioxidant activity. 3-（4,5-Dimethylthiazol-2-yl）-2,5-diphenyl tetrazolium bromide （MTT） colorimetric assay and the TdT-mediated digoxigenin-dUTP nick-end labeling （TUNEL） assay for apoptosis showed that administration of H2O2 in human dermal fibroblasts caused cell damage and apoptosis. Pre-incubation of human dermal fibroblasts with the Oatp for 24 h markedly inhibited human dermal fibroblast injury induced by H2O2, but ap- plication oat peptides with H2O2 at same time did not. Pre-treatment of human dermal fibroblasts with Oatp significantly reversed the H2O2-induced decrease of superoxide dismutase （SOD） and the inhibition of malondialdehyde （MDA）. The results demonstrate that oat peptides possess antioxidant activity and are effective against H2O2-induced human dermal fibroblast injury by the enhanced activity of SOD and decrease in MDA level. Our results suggest that oat bran will have the potential to be further explored as an antioxidant functional food in the prevention of aging-related skin injury.

Comparative study of the effects of gold and silver nanoparticles on the metabolism of human dermal fibroblasts

The purpose of this article was to explore the effects of gold nanoparticles(GNPs)and silver nano-particles(SNPs)with different cytotoxicities on human dermal fibroblasts(HDFs)at the metabolic level.First,~20 nm of GNPs and SNPs were prepared,and their effects on the proliferation of HDFs were evaluated.Then,a metabolomics technique was used to analyse the effects of GNPs and SNPs on the expression profiles of metabolites in HDFs after 4,8 and 24h of treatment.Furthermore,the key metabolites and key metabolic pathways involved in the interaction of GNPs and SNPs with HDFs were identified through expression pattern analysis and metabolic pathway analysis of differentially expressed metabolites and were finally verified by experiments.The results of the cytotoxicity experiments showed that there was no cytotoxicity after the treatment of GNPs for 72 h,while the cytotoxicity of the SNPs reached grade 1 after 72 h.By using metabolomics analysis,29,30 and 27 metabolites were shown to be differentially expressed in HDFs after GNP treatment,while SNPs induced the differential expression of 13,33 and 22 metabolites after 4,8 and 24h of treatment,respectively.Six and four candidate key metabolites in the GNP and SNP groups were identified by expression pattern analysis and metabolic pathway analysis,respec-tively.The key metabolic pathways in the GNP and SNP groups were identified as the glutathione metabolic pathway(the key metabolite of which was glutathione)and the citrate cycle pathway(the key metabolite of which was malic acid).Based on the experiments used to verify the key metabolites and key metabolic pathways,it was found that the increase in glutathione after GNP treatment might trigger an oxidative stress protection mechanism and thus avoid cytotoxicity.After exposure to SNPs,the citric acid content was increased,mainly through the citrate cycle path-way,thereby inhibiting the synthesis of malic acid to affect the formation of ATP and finally leading to cytotoxicity.

UV-induced senescence of human dermal fibroblasts restrained by low-stiffness matrix by inhibiting NF-κB activation

As a hallmark of skin aging,senescent human dermal fibroblasts(HDFs)are known to lose the ability to divide.However,they can still interact with their cellular environment and the surrounding matrix.As the skin ages,the progressive slowing down of HDFs function decreases the skin’s structural integrity,which is more serious than if there is the dermal collagen matrix eroded.This leads to matters of the unbalanced barrier under the skin,skin fragility,inadequate wound healing,as well as other cosmetic issues.It is also well documented that skin aging comes with significant stiffness increases.Therefore,understanding the interactions between HDFs and the surrounding microenvironments during senescence may provide insights into skin aging.Here we aim to inves-tigate matrix stiffness’effect on HDF senescence and elucidate possible mechanisms that make HDFs senescent.In our experiments,HDFs were cultivated on Polydimethylsiloxane(PDMS)with various stiffnesses and exposed to UV light to trigger senescence.Results show that HDFs are significantly affected by senescence when cultured on a matrix with stiffness.However,the cells are not significantly affected when cultured on a low stiffness matrix.The following characterization revealed cells cultured on stiffsubstrates under UV exposure had stimu-lated the nucleus factor kappa-B(NF-κB)activation.In contrast,cells on a matrix of softness only displayed low activation of NF-κB.NF-κB activity suppression with ammonium pyrrolidine dithiocarbamate(PDTC)decreases UV-induced HDFs senescence on stiffsubstrates.Taken together,we demonstrated that soft matrix defends HDFs against ultraviolet-induced senescence by inhibiting the activation of NF-κB.

Human dermal reticular fibroblasts at confluence display a signature micro pattern <i>in vitro</i>

This paper sets out to demonstrate that scraping of the flat dorsal surface of human dermis with a scalpel blade and cell plating without centrifugation can lead to the recognition and identification of the individual packing micro pattern of dermal reticular fibroblasts at confluence. The characteristic alignment of papillary and reticular fibroblasts at right angles to each other led to the positive identification of reticular fibroblasts. A non-enzymatic means of sub-culturing (passaging), which yields fully functional, healthy cells with normal, phenotypic morphology is also described. Implications for published subcutaneous wound healing studies are discussed as well as the confluent reticular fibroblast configuration, interpreted as ananatomic site identity code,which may be the address of a specific fibroblast gene pattern expression.

年轻化间充质干细胞条件培养基促进小鼠创面愈合的研究

背景间充质干细胞(mesenchymal stem cell,MSC)条件培养基无细胞疗法是创伤修复领域的一种新型治疗方案,但其治疗效果受间充质干细胞状态的影响。目的探究年轻化MSC培养基对小鼠创面愈合的作用。方法建立间充质干细胞复制性衰老(传代至15~20代)模型,检测其衰老指征;使用小分子化合物[丙戊酸(valproic acid,VPA)和RepSox]逆转衰老间充质干细胞并验证逆衰老效果。分别收集衰老MSC培养基与年轻化MSC培养基。用收集到的两种条件培养基培养人成纤维细胞,使用CCK-8实验、Ki-67免疫荧光、划痕实验和Transwell实验检测这两种条件培养基对成纤维细胞增殖、迁移和侵袭能力的影响。分别用衰老MSC培养基、年轻化MSC培养基和0.9%氯化钠注射液治疗C57BL/6小鼠背部皮肤全层缺损模型,评估3种治疗方法对创面愈合的影响。结果与衰老的间充质干细胞相比,经小分子处理后衰老间充质干细胞SA-β-gal阳性率降低(P<0.01),且免疫荧光检测显示其衰老基因P21、P16表达降低(P<0.01)。经年轻化MSC培养基处理的成纤维细胞增殖、迁移和侵袭能力增强(P<0.01)。创伤模型显示,与对照组相比,年轻化MSC培养基治疗组小鼠创面愈合速度加快(P<0.01);年轻化MSC培养基治疗组小鼠创面HE染色显示表皮细胞再上皮化加快(P<0.01)、Masson染色显示创面胶原沉积量增加(P<0.01)、CD31免疫荧光染色显示创面血管量增加(P<0.01)。结论年轻化MSC培养基对小鼠创面修复或有促进作用。

口服生物活性胶原蛋白肽的筛选与体外功效评价

本文研究9个胶原蛋白肽的溶解度、羟脯氨酸含量、肽相对分子量和促进人真皮成纤维细胞生长功效四个方面的特性,为开发人真皮成纤维细胞生长的生物活性胶原蛋白肽功能性饮品提供参考。

纳秒脉冲电场刺激促进人真皮成纤维细胞成骨的实验研究

目的 探究超短纳秒脉冲电场(Nanosecond Pulsed Electric Field,nsPEF)是否能够促进成纤维细胞向成骨细胞的表型转化。方法 用0、5 kV/cm的场强刺激成纤维细胞,观察其在普通培养基和三向分化诱导培养基中生长情况,蛋白印迹测定细胞内调控生长及分化Hippo通路下游信号分子水平,并通过体内注射细胞-凝胶复合体进行裸鼠体内成骨实验。结果 5kV/cm nsPEF促进了成纤维细胞的增殖,并促进了成骨、成软骨分化,但对成脂分化影响不显著。低能量脉冲电场刺激抑制了Hippo通路下游各信号分子磷酸化水平,促进了裸鼠体内成骨,灰度分析显示,YAP1及LATS1的磷酸化蛋白与非磷酸化蛋白比值在5 kV/cm的脉冲电场刺激后明显降低,提示HIPPO信号通路受到抑制(P<0.05)。结论 低强度nsPEF刺激有效促进了成纤维细胞的增殖和表型转化,并在裸鼠模型上证实了可行性和有效性。

细梗蔷薇愈伤组织提取物在人真皮成纤维细胞及3D表皮模型上的护肤功效探究

通过植物组织培养技术得到细梗蔷薇(Rosa graciliflora)愈伤组织,利用纯水超声提取和真空冷冻干燥工艺获得细梗蔷薇愈伤组织提取物(RCE),然后对RCE进行成分检测和体外护肤功效评估。结果表明,RCE含有氨基酸、维生素、有机酸和多酚等多种活性成分。体外护肤检测结果表明,RCE对人真皮成纤维细胞有一定的增殖作用,0.01%和0.05%RCE能促进人真皮成纤维细胞分泌Ⅰ型胶原蛋白,与空白对照对比,其Ⅰ型胶原蛋白分别提高83%和79%,作用效果和阳性对照维生素C相似。此外,在重建的3D表皮模型上,0.01%RCE能够显著促进细胞增殖活性标记物Ki67、皮肤屏障功能标志物丝聚蛋白(Filaggrin)及外膜蛋白(Involucrin)的表达,相比空白对照,其阳性率分别提高308%,853%和349%,具有显著差异性。研究发现RCE具有潜在的延缓皮肤衰老和提高皮肤屏障功能的作用,有望作为一种绿色原料添加在化妆品中使用。

酮洛芬异丙酯在皮肤细胞中的代谢

目的 :研究酮洛芬异丙酯在皮肤细胞中的代谢作用 ,为进一步研究利用酯类前体药物方法改善药物的经皮吸收特性提供实验依据。方法 :将人包皮的第 3代角质形成细胞或成纤维细胞超声破碎制成匀浆 ,加入不同量的酮洛芬异丙酯进行37℃温孵实验 ,通过高效液相色谱法分别在不同时间测定细胞匀浆中酮洛芬异丙酯及酮洛芬的浓度。结果 :酮洛芬异丙酯在表皮角质形成细胞和真皮成纤维细胞的匀浆中存在代谢现象 ,且前者的代谢能力明显大于后者。结论

丹皮酚对TNF-α诱导真皮成纤维细胞MMP-9 mRNA及细胞因子表达的影响

目的通过研究丹皮酚对TNF-α诱导的真皮成纤维细胞MMP-9 mRNA及细胞因子表达的影响,探讨丹皮酚抗皮肤炎症的可能机制。方法采用RT-PCR法考察正常人真皮成纤维细胞中MMP-9 mRNA表达情况以及丹皮酚对TNF-α诱导的真皮成纤维细胞MMP-9 mRNA表达的影响。采用ELISA法测定丹皮酚对TNF-α诱导的真皮成纤维细胞表达IL-1β、IL-6及IL-8的影响。结果MMP-9在正常真皮成纤维细胞上表达极弱,TNF-α可以诱导MMP-9 mRNA的表达,丹皮酚可以抑制TNF-α诱导引起的MMP-9 mRNA表达的上调。成纤维细胞可分泌少量的IL-1β、IL-6及IL-8,TNF-α可以明显增加成纤维细胞IL-1β和IL-8的分泌量,丹皮酚可以抑制TNF-α诱导的IL-1β和IL-8的产生,但对IL-6的分泌无影响。结论丹皮酚可以抑制TNF-α诱导真皮成纤维细胞引起的MMP-9 mRNA及炎症因子IL-1β和IL-8表达水平的上调。

壳聚糖膜的制备及其对人、大鼠皮肤成纤维细胞的相容性

为考察壳聚糖对皮肤成纤维细胞的相容性 ,采用流延法制备了纯壳聚糖膜和含甘油的壳聚糖膜 ,并在所制备的壳聚糖膜上进行了大鼠皮肤成纤维细胞和人胎儿皮肤成纤维细胞的体外培养 .结果表明 ,壳聚糖膜在培养开始阶段会导致部分贴附细胞的破坏 ,而进一步培养会促进这些细胞的生长和增殖 .当细胞长满膜表面发生互相接触时 ,细胞产生接触抑制现象 ,不再继续增殖 .研究还发现 ,不论在标准培养板上还是在不同的壳聚糖膜上 。

富血小板血浆对体外培养条件下人真皮成纤维细胞增殖能力的影响

目的:探讨富血小板血浆(PRP)对人真皮成纤维细胞(hDFbs)在体外培养条件下增殖能力的影响,探讨PRP促进皮肤、黏膜伤口愈合的机制。方法:PRP和hDFbs来源于健康成年人,两次离心法制备PRP,倒置相差显微镜观察0、12.5%、25.0%、50.0%和100.0%PRP浓度作用下hDFbs的增殖;免疫细胞化学检测50.0%浓度不同剂量PRP作用下细胞血小板源性生长因子(PDGF)的表达;荧光染色技术观察PRP作用下hDFbs在纯钛材料表面的生长;流式细胞术检测PRP培养后不同时间hDFbs细胞周期;CCK-8法检测不同浓度PRP培养条件下细胞增殖活力。结果:倒置相差显微镜下见PRP各浓度组细胞数量均多于对照组,细胞数量增加、折光性增强;免疫细胞化学检测,30μL PRP组PDGF表达量最高且细胞密度最大,但10μL PRP组累积吸光度值(IOD)高于20μL PRP组(836.27±21.15 vs 794.35±30.26,P<0.05);荧光染色技术观察,PRP组材料表面hDFbs细胞密集,数量较对照组高;细胞周期检测,PRP促进细胞进入S期进行DNA复制,PRP作用后第2天PRP组S期细胞百分比高于空白组(34.41%vs 22.00%,P<0.05),第8天PRP组G0/G1期细胞百分比高于空白组(95.07%vs 89.70%,P<0.05);CCK-8测定细胞增殖活性,100.0%PRP组吸光度A450值高于12.5%PRP组(34.41%vs 22.00%,P<0.05)。结论:高浓度的PRP虽然表现较强的促细胞增殖作用,但并不存在浓度、剂量依赖性,适宜浓度的PRP可促进hDFbs的增殖。

槌果藤乙醇提取物对体外培养的人皮肤成纤维细胞生长的影响

目的研究槌果藤乙醇提取物对体外培养的人皮肤成纤维细胞生长的影响。方法用四甲基偶氮唑盐比色试验和生长曲线测定法,比较槌果藤乙醇提取物不同作用浓度下对正常人皮肤成纤维细胞体外生长活力和生长状态的影响。结果槌果藤提取物可明显抑制皮肤成纤维细胞的体外增殖,槌果藤乙醇提取物浓度为40μg/mL时,对人成纤维细胞增殖率的抑制作用与药物剂量呈明显的正相关,对正常人皮肤成纤维细胞的生长抑制率与药物的作用时间相依赖。结论中药槌果藤乙醇提取物可抑制体外正常人皮肤成纤维细胞的增殖。

富血小板血浆对人真皮细胞增殖及PDGF、TGF-β和VEGF表达的影响

目的:研究富血小板血浆(PRP)对人真皮成纤维细胞(hFbs)增殖、分化及胞质中PDGF、TGF-β和VEGF表达量的影响。方法:2次离心法制备PRP,成骨诱导条件下hFbs培养液中加入不同浓度PRP于第12天、21天钙-钴法染色,第21天茜素红染色;免疫细胞化学法检测加不同浓度PRP后第4天细胞PDGF、TGF-β和VEGF的表达;碱性磷酸酶染色(ALP)检测细胞活性;CCK-8法检测有和无成骨诱导条件下不同浓度PRP对细胞增殖的影响。结果:茜素红染色显示,2.8%PRP组钙结节形成最明显;钙-钴法染色显示,2.8%PRP组矿化作用最强;免疫细胞化学结果表明PDGF表达存在剂量依赖性,TGF-β和VEGF表达虽无剂量依赖性,但有适宜浓度的要求;ALP染色表明3%PRP组细胞增殖明显,活性最强。CCK-8检测表明各浓度PRP对hFbs均有促增殖作用,PRP加成骨诱导组比单纯PRP组表现出更明显的促增殖作用,其中4.8%PRP促增殖作用最强。结论:适宜浓度的PRP可促进hFbs增殖,但相关因子的表达存在适宜浓度的要求,PRP通过促进细胞增殖,增加相关因子表达促进创伤愈合。

冰川水和白雪茶提取物延缓人真皮成纤维细胞衰老的实验研究

本文主要研究了冰川水和白雪茶提取物对正常人真皮成纤维细胞的抗衰老作用及其潜在的机制。用冰川水和白雪茶提取物处理正常人真皮成纤维细胞,检测了不同处理对细胞活性、细胞外基质成分及其水解酶表达水平的影响。结果显示,冰川水和白雪茶提取物可以提高人真皮成纤维细胞的增殖活性和能量代谢水平,促进透明质酸和弹性蛋白的表达;此外,白雪茶提取物还可以促进I型胶原蛋白的表达和下调弹性蛋白酶的mRNA表达水平;两者共同作用时影响更显著。以上研究表明,冰川水和白雪茶提取物有延缓皮肤衰老的作用,作用机制与两者可增强成纤维细胞活力,提高外基质成分的表达水平并抑制部分成分的降解有关。