驱白艾力勒思亚散乙醇提取物对小鼠B16黑素瘤细胞增殖及黑素生成的影响

目的研究维药复方驱白艾力勒思亚散(QBALLSYS)乙醇提取物对小鼠B16黑素瘤细胞增殖、黑素合成以及酪氨酸酶活性的影响。方法以MTT法测定培养的B16黑素瘤细胞的增殖活性;氢氧化钠法测定黑素生成量;体外氧化多巴反应方法测定酪氨酸酶活性。结果与空白对照组相比,驱白艾力勒思亚散乙醇提取物对B16黑素瘤细胞的增殖活性、黑素生成量、酪氨酸酶活性均有显著性作用(P<0.05或P<0.01)。驱白艾力勒思亚散乙醇提取物对小鼠B16黑素瘤细胞的增殖活性有上调作用,对细胞黑素生成以及酪氨酸酶的活性均有不同程度的促进作用。结论驱白艾力勒思亚散的乙醇提取物具有促进黑素细胞增殖和合成黑素的作用。     

四种含药血清对小鼠B16黑素瘤细胞黑素合成及酪氨酸酶活性的影响

目的研究传统医学文献中专治白癜风的常用药物诃子、余甘子、柴胡及药群组合(含木香、胡椒、干姜等)的药物血清对小鼠B16黑素瘤细胞黑素合成及酪氨酸酶活性的影响。方法采用"通法"制备上述药物高、低不同剂量的大鼠含药血清及不含药物的空白血清,以体外培养的小鼠B16黑素瘤细胞为模型,采用MTT法测定各组受试血清对B16细胞增殖活性的影响;NaOH细胞裂解法测定黑素合成量,L-DOPA氧化法测定对酪氨酸酶活性的影响。结果与正常对照组(含10%小牛血清)相比,除组合低剂量组外,其他受试血清均不影响小鼠B16细胞的增殖活性(P>0.05);与空白血清组相比,柴胡和药群组的高、低剂量组含药血清均对B16黑素瘤细胞黑素合成有促进作用(P<0.05,P<0.01),而诃子低剂量、牛柑子高剂量组含药血清具有促进黑素合成的作用(P<0.05,P<0.01);与空白血清组相比,四种受试药物的高低剂量组含药血清对小鼠B16细胞酪氨酸酶活性均有激活作用(P<0.05,P<0.01)。结论四种受试药物含药血清除组合低剂量组外,均在不影响小鼠B16细胞增殖活性的基础上,表现出不同程度的促进其黑素合成的作用,此作用与提高酪氨酸酶活性有一定关系。     

鱿鱼皮胶原蛋白多肽对B16黑素瘤细胞黑素合成的影响

目的研究不同分子量鱿鱼皮胶原蛋白多肽SP1(Mr>10000u)、SP2(6000u相似文献   

高良姜总黄酮对B16细胞增殖和酪氨酸酶活性及黑素合成的影响

目的探讨高良姜总黄酮对B16小鼠黑素瘤细胞增殖、酪氨酸酶活性及黑素合成的影响。方法采用四甲基偶氮唑盐(MTT)比色法测定细胞增殖,比色法测定酪氨酸酶活性和黑素含量。结果在浓度为0.25～10.00μmol.L-1范围内,高良姜总黄酮均可显著促进B16细胞的增殖(P<0.01);浓度为0.5,1.0μmol.L-1时,高良姜总黄酮能够促进酪氨酸酶活性和黑素合成。结论高良姜总黄酮在一定浓度范围内能够促进B16细胞增殖、酪氨酸酶活性升高和黑素合成。     

4味中药乙醇提取物祛黄褐斑作用的比较研究

目的比较白附子、银花、白芨、六月雪4味中药乙醇提取物祛黄褐斑作用的差异,选出作用最强的药材。方法以MTT法测定小鼠B16黑素瘤细胞增殖抑制率、酪氨酸酶活性、黑素含量变化;采用多重比较法进行统计分析。结果银花的浓度为62.5μg.mL-1,白芨、白附子各浓度(500、250、125、62.5μg.mL-1)均对B16鼠黑素瘤细胞增殖抑制作用较强。白附子的浓度为250μg.mL-1或银花的浓度为62.5μg.mL-1对小鼠B16黑素瘤细胞酪氨酸酶活性抑制作用最佳。白附子的浓度为125μg.mL-1对黑素合成抑制作用最好。结论白芨与白附子可作为祛黄褐斑有效成分的候选药材。     

氢化可的松对B-16黑素瘤细胞酪氨酸酶及黑素生成影响研究

目的　探讨氢化可的松体外对酪氨酸酶活性影响 ,以及对小鼠B 16黑素瘤细胞株细胞增殖、黑素合成以及细胞内酪氨酸酶活性的作用。方法　利用四甲基偶氮唑蓝(MTT)比色法测定药物对细胞增殖的影响 ;采用酶学方法研究药物对酪氨酸酶活性的影响 ;用 5 70nm比色法测定黑素含量。结果　氢化可的松体外可激活酪氨酸酶活性 ,增强B16鼠黑素瘤细胞增殖 ,提高酪氨酸酶和黑色素合成能力。结论　氢化可的松可增强酪氨酸酶活性 ,进而促进黑素合成。     

不同组方祛白脂对小鼠B16黑素瘤细胞代谢的影响

目的：探寻祛白脂组方中影响小鼠B16黑素瘤细胞代谢的因素。方法：以小鼠B16细胞增殖活性、黑素生成量、酪氨酸酶活性为指标,以8-甲氧补骨脂素（8-MOP）浓度和辅药为考察因素,选用3×2析因设计研究不同组方祛白脂对小鼠B16黑素瘤细胞代谢的影响,用SPSSl 3.0软件辅助数据分析。结果：8-MOP 10μmol·L-1处理组小鼠B16黑素瘤细胞增殖能力明显高于其他组（P〈0.01）,8-MOP 50μmol·L-1处理组小鼠B16黑素瘤细胞黑素含量、酪氨酸酶活性明显高于其他组（P〈0.01）;加入辅药小鼠B16黑素瘤细胞增殖能力、黑素含量、酪氨酸酶活性显著高于不加辅药组（P〈0.01）;8-MOP浓度和辅药处理的交互作用对小鼠B16黑素瘤细胞增殖能力、黑素含量、酪氨酸酶活性有显著影响（P〈0.01）。结论：祛白脂中8-MOP浓度和辅药是影响小鼠B16黑素瘤细胞代谢的主要因素。     

驱虫斑鸠菊提取物抑制恶性黑色素瘤A375细胞增殖的研究

目的探讨驱虫斑鸠菊提取物对人恶性黑色素瘤A375细胞的增殖以及对其酪氨酸酶活性和黑色素含量的影响。方法四甲基噻唑氮蓝比色法测定对A375细胞抑制作用;显微法观察细胞形态;比色法测定酪氨酸酶活性和黑色素含量。结果在一定质量浓度范围(1～40mg.L-1)内随着驱虫斑鸠菊提取物质量浓度增加可抑制黑色素瘤细胞的增殖;驱虫斑鸠菊提取物质量浓度小于10mg.L-1,对酪氨酸酶活性和黑色素合成抑制有增加的趋势;大于20mg.L-1时,显示一定的细胞毒性作用。结论驱虫斑鸠菊提取物能显著抑制恶性黑色素瘤A375细胞的增殖,在一定质量浓度范围内(1～40mg.L-1)有浓度依赖关系(P<0.05)。     

姜黄素对黑素的抑制作用及机制北大核心CSCD

目的姜黄素调节B16F10细胞微环境影响黑素合成的机制研究。方法(1)不同浓度姜黄素分别作用于B16F10及HaCaT细胞,MTT法检测该两种细胞活力;NaOH裂解法检测B16F10细胞黑素含量;L-DOPA氧化法检测B16F10细胞酪氨酸酶活性;Western blot法检测B16F10细胞黑素生成(gp100、Mitf、GPNMB、Tyr、TRP2)及转运(Rab27a)关键蛋白表达水平;HaCaT细胞:ISG15蛋白表达水平。(2)不同浓度ISG15作用于B16F10细胞,NaOH裂解法检测黑素含量;L-DOPA氧化法检测酪氨酸酶活性;结果姜黄素在一定浓度范围内,直接抑制酪氨酸酶活性及黑素生成,且抑制黑素细胞迁移;ISG15蛋白作用于黑素细胞,明显促进gp100蛋白表达,酪氨酸酶活力,黑素含量。姜黄素抑制HaCaT细胞ISG15蛋白表达,改变黑素细胞微环境,通过ISG15间接发挥抑制黑素合成作用。结论姜黄素除直接抑制黑素合成外,还可以通过抑制ISG15蛋白的表达,改变黑素细胞微环境,间接发挥抑制黑素合成作用。     

海莲叶乙醇提取物的抗氧化作用和对黑素的抑制作用

目的 研究海莲叶乙醇提取物（BLE60）的抗氧化和抑制黑素作用，并对它的皮肤刺激性进行评价。方法 首先通过检测二苯代苦味酰肼(DPPH)自由基和细胞活性氧（ROS）研究BLE60的抗氧化活性，接着在小鼠 B16 黑色素瘤细胞上研究BLE60对酪氨酸酶和黑素的抑制作用，然后以western blotting检测BLE60对酪氨酸酶表达的影响，最后通过家兔皮肤多次给药研究BLE60的皮肤刺激性。结果 BLE60能清除DPPH自由基和UVA诱导的ROS，同时也抑制细胞酪氨酸酶活性和减少黑素产生和酪氨酸酶表达。BLE60多次给药对家兔皮肤无刺激性。结论 BLE60具有抗氧化和抑制黑素活性，且对皮肤无刺激性。BLE60主要通过下调酪氨酸酶表达来降低酪氨酸酶活性，从而抑制黑素产生。     

紫草素对人黑素瘤细胞增殖及黑素合成的影响

目的探讨紫草素对人黑素瘤细胞增殖及黑素合成的影响。方法采用MTT法测定紫草素对人A375黑素瘤细胞增殖的影响,NaOH裂解法测定黑素合成。并分成实验组（紫草素组）、对照组（空白组）和阳性对照组[甲氧沙林（8-MOP）组],对其结果进行比较分析。结果紫草素浓度在0.25～1μmol/L对人A375黑素瘤细胞增殖无影响（P〉0.05）,2μmol/L和4μmol/L的紫草素对于A375黑素瘤细胞的增殖有一定的抑制作用（P〈0.05或P〈0.01）。紫草素对于人A375黑素瘤细胞中酪氨酸酶活性呈剂量依赖性激活作用。实验组与对照组比较,0.25、0.5及1μmol/L紫草素对人A375黑素瘤细胞酪氨酸酶活性有激活作用,差异有统计学意义（P〈0.01）;且阳性对照组紫草素作用优于对照组,差异有统计学意义（P〈0.05）;实验组浓度为0.25、0.5及1μmol/L紫草素溶液和阳性对照组与对照组比较,对于人A375黑素瘤细胞中黑素合成有激活作用,差异有统计学意义（P〈0.05或P〈0.01）。结论紫草素对于培养的人黑素瘤细胞酪氨酸酶活性及黑素生成有较强的剂量相关性激活作用。     

Down-regulation of tyrosinase expression by acetylsalicylic acid in murine B16 melanoma

Acetylsalicylic acid (aspirin; ASA) is widely used as an analgesic/antipyretic drug. ASA exhibits a wide range of biological effects, including preventative effects against heart attack, stroke, and the development of some types of cancer. However, the effects of ASA on melanogenesis are not well known. Therefore, we investigated the effect of ASA on melanin production using B16 murine melanoma cells and demonstrated a new biological effect of ASA. In the presence of alpha-melanocyte stimulating hormone (alpha-MSH), B16 melanoma cells are stimulated to enhance melanin synthesis. ASA (2 mM) inhibited alpha-MSH-enhanced melanin synthesis in melanoma more strongly than other well-known anti-melanogenic agents such as arbutin (2 mM) and kojic acid (200 microM). Interestingly, ASA did not inhibit the catalytic activity of mushroom tyrosinase (concentration range 0.5-4.0 mM). To clarify the target of ASA action in melanogenesis, we performed Western blotting for tyrosinase, which is a key melanogenic enzyme. ASA inhibited tyrosinase expression in a dose-dependent manner. Therefore, the depigmenting effect of ASA might be due to inhibition of tyrosinase expression or enhancement of tyrosinase degradation. This study suggests that ASA is a candidate anti-melanogenic agent and it might be effective in hyperpigmentation disorders.     

N-trans-feruloyltyramine as a melanin biosynthesis inhibitor

In this study, we examined the effect of N-trans-feruloyltyramine (FA) on melanogenesis in mouse B16 melanoma cells. Melanogenesis was inhibited by FA in a dose-dependent manner. FA exhibited a greater potency than kojic acid as a standard inhibitor of melanogenesis. Moreover, treatment of B16 melanoma cells with FA was found to cause marked decreases in the expression levels of tyrosinase. FA-induced downregulation of tyrosinase resulted in suppression of melanin biosynthesis in murine B16 melanoma cells.     

养颜青娥丸对小鼠B-16黑素瘤细胞株黑素合成和酪氨酸酶的影响

目的：研究养颜青娥丸对小鼠B－16黑素瘤细胞株细胞增殖、黑素合成的影响及对细胞内酷氨酸酶的影响。方法：四甲基偶氮唑蓝（MTT）比色法测定养颜青娥丸对细胞增殖的影响；酶学方法研究养颜青娥丸对酷氨酸酶活性的作用；470nm比色法测定合成黑素含量A值。结果：研究发现养颜青娥丸对黑素细胞增殖及酷氨酸酶活性有抑制作用，对合成黑素含量有降低作用；组方单味药中杜仲、沙苑子、制首乌对黑素细胞增殖及酷氨酸酶活性有抑制作用，对合成黑素含量有降低作用；补骨脂、核桃肉对黑素细胞增殖及酷氨酸酶活性有促进作用，对合成黑素含量有增加作用。结论：养颜青娥丸对黄褐斑可能有一定的治疗作用，但治疗机制不能单纯用生化学、酶学改变来解释。     

Whitening activity of luteolin related to the inhibition of cAMP pathway in α-MSH-stimulated B16 melanoma cells

To examine the possibility of luteolin as a whitening agent, we measured antioxidant activity using DPPH assay, NBT/XO assay and intracellular ROS scavengning assay and depigmenting activity using tyrosinase assay, alpha-MSH-induced melanin production in B-16 cells. Luteolin showed dose-dependent anti-oxidant activity in DPPH, NBT/XO and intracellular ROS assay. Also, luteolin directly inhibited xanthine oxidase activity in a dose-dependent manner. Although luteolin did not directly inhibit tyrosinase activity, it dose-dependently inhibited both tyrosinase activity and melanin production in B16 melanoma cells stimulated by 1 muM alpha-MSH. Luteolin dose-dependently inhibited cAMP levels in B16 melanoma cells stimulated by 1 muM alpha-MSH and 1 muM forskolin, which suggest that luteolin directly inhibits adenyl cyclase in B16 melanoma cells. Therefore, these results suggest that whitening activity of luteolin may be due to the inhibition of adenyl cyclase involved in the signal pathway of alpha-MSH in B16 melanoma cells.     

Inhibitory effect of miconazole on melanogenesis

Miconazole (MIC), a regional antifungal agent, has been used worldwide in the treatment of superficial mycosis. However, the effect of MIC on skin pigmentation is not known. In this study, we investigated the inhibitory effect of MIC on melanogenesis in B16 melanoma cells. Tyrosinase activity and melanin content were dose dependently decreased by MIC as compared with untreated cells. The level of tyrosinase protein expression was reduced with treatment MIC. A decrease in cell proliferation was observed in B16 cells treated with MIC 30 microM, indicating that the MIC-induced depigmenting effect was caused by inhibition of melanin synthesis and not by destruction of B16 cells. Furthermore, MIC markedly suppressed alpha-melanocyte stimulating hormone or forskolin-induced tyrosinase activity in B16 cells. Therefore the depigmenting effect of MIC might be due to the inhibition of tyrosinase activity and tyrosinase expression, which eventually slows melanin biosynthesis. These results indicate that MIC may be a useful inhibitor of melanogenesis in B16 cells and suggest that it may have beneficial effects in the treatment of hyperpigmentation disorders such as ephelis and melasma.     

Topical application of gamma-tocopherol derivative prevents UV-induced skin pigmentation

We previously reported that a novel hydrophilic gamma-tocopherol (gamma-Toc) derivative, gamma-tocopheryl-N,N-dimethylglycinate hydrochloride (gamma-TDMG) gets converted to the antioxidant gamma-Toc in skin. We also found that this derivative displayed greater bioavailability than gamma-Toc itself. In the present study, we determined whether gamma-TDMG could reduce UV-induced skin pigmentation in brownish guinea pigs. gamma-TDMG (0.1 or 0.5%) was topically applied to the skin before and after it was exposed to UVB plus UVA (3 times/week for 1 week), and then 10 times/week for 4 weeks thereafter. Treatment with 0.5% gamma-TDMG resulted in significant skin lightening (70% of the pigmentation of irradiated controls). We also found that melanin synthesis was dose-dependently inhibited by gamma-TDMG in murine B16 melanoma cells. When gamma-TDMG or kojic acid (250 muM) were added to homogenates of B16 melanoma cells, their tyrosinase activity was significantly inhibited by approximately 40% and 75%, respectively. Mushroom tyrosinase activity was significantly inhibited by 200 muM gamma-Toc and kojic acid, but not gamma-TDMG. When B16 cells were incubated with 250 muM gamma-TDMG for 24 or 48 h, their intracellular gamma-Toc concentrations rose over 100 fold to 10.5 and 11.2 nmol/10(6) cells, respectively, suggesting that gamma-TDMG was rapidly converted to gamma-Toc in these cells and that their reduced melanin synthesis may have been due to the activity of gamma-Toc. Our data further suggest that the topical application of gamma-TDMG may be efficacious in preventing photo-induced skin pigmentation in humans.     

Antimelanogenic and antioxidant properties of gallic acid

To find novel skin-whitening agents, the melanogenesis inhibitory action of gallic acid (GA) was investigated. In this current study, the effects of GA on mushroom tyrosinase, tyrosinase inhibitory activity, and melanin content were assessed in B16 melanoma cells (B16 cells). Results indicated that GA has a strong antityrosinase activity (IC50=3.59x10(-6) M). Furthermore, data on murine tyrosinase activity and melanin biosynthesis revealed that GA effectively suppressed murine tyrosinase action and the amount of melanin. To investigate the relation between GA's inhibition of melanogenesis and antioxidant activity, the effect of GA on reactive species (RS) generation and the reduced glutathione (GSH)/oxidized glutathione (GSSG) ratio in were determined in B16 cells. Results indicated that GA effectively down-regulated the RS generation and enhanced the GSH/GSSG ratio. Based on these results, I propose that GA exerts antimelanogenic activity coupled with antioxidant properties by suppressing RS generation and maintaining a higher GSH/GSSG ratio.