常用中药脱色对人A375黑素瘤细胞酪氨酸酶活性的影响研究

目的:用活性炭为脱色剂,研究中药水提取物未脱色与脱色后对人A 375黑素瘤细胞酪氨酸酶(TYR)活性的影响。方法:采用多巴速率氧化法研究脱色中药对TYR活性的影响。结果:未经活性炭脱色的中药对TYR活性有明显激活或抑制作用(P<0.05或P<0.01),而经活性炭脱色后,黑色(深色)中药失去或明显降低对TYR活性的激活作用;白色(浅色)中药脱色前后对比,其差异无统计学意义(P>0.05)。结论:经活性炭脱色后,黑色(深色)中药失去或降低了对TYR活性的激活作用,而对白色(浅色)中药的作用影响不明显。说明药材颜色与色素代谢调节存在一定的相关性,在色素代谢障碍性皮肤病的临床治疗中值得借鉴应用。

间质短距离放射疗法治疗4例原发性皮肤黑素瘤患者(法语)

Background.Traditionally melanoma has been considered as a radioresistant tumor.However,recent observations regarding radiobiology and clinical response of melanoma have prompted physicians to re-evaluate the role of radiotherapy in the management of melanoma.Indeed,radiotherapy is frequently used in the treatment of metastatic melanoma but the role of this therapeutic approach in the primary tumor management is unclear.We report 4 cases of thick primary melanoma treated by interstitial brachytherapy.Case reports.Four patients(3 men,1 woman;age:73,74,79,84 years),three with lentigo maligna melanoma and one with nodular melanoma,were treated exclusively by interstitial brachytherapy.The thickness of the 4 tumors was more than 3 mm.This treatment was chosen either because of the impossibility of conservative surgery or because of a contraindication for general anesthesia.Median follow-up was 48 months [18 to 65 months] and we did not observe any local tumor relapse.The cosmetic and functional results of this therapy were excellent.Discussion.These four cases illustrate the possibility of obtaining good local control of thick primary melanoma by interstitial brachy therapy where surgery is impossible,although without challenging the standard surgical therapy for primary melanoma.Before our study,this treatment was used only in one study to treat melanoma patients.In this case however,interstitial brachy therapy was accompanied by surgery.Therefore,the findings reported here are the first to demonstrate the efficacy of this treatment when used as the sole treatment for primary melanoma.In conclusion,where surgery is difficult or impossible,interstitial brachytherapymay be used to treat primary melanoma with excellent local tumor control and a good cosmetic outcome.

中药滋补肝肾方对鼠B16黑素瘤细胞酪氨酸酶mRNA表达的调节

目的 探讨中药滋补肝肾方治疗白癜风的分子学作用机制。方法 采用定量逆转录 聚合酶链式反应(RT PCR)方法 ,观察中药滋补肝肾方对鼠B16黑素瘤细胞株酪氨酸酶mRNA表达的影响。结果 中药滋补肝肾方能使黑素瘤细胞酪氨酸酶mRNA表达水平增加。结论 中药滋补肝肾方能上调黑素细胞酪氨酸酶mRNA表达水平 ,这是其治疗白癜风的药理作用机制之一。

色象中药对人A375黑素瘤细胞酪氨酸酶活性的影响

目的:研究黑白两类中药水提取物对人A 375黑素瘤细胞酪氨酸酶活性调节的影响。方法:采用多巴速率氧化法研究中药对酪氨酸酶活性调节的影响。结果:研究发现,与对照组相比,黑色组中药大部分对酪氨酸酶活性有明显促进作用(P<0.05或P<0.01),而白色组大部分则有明显抑制作用(P<0.05或P<0.01)。另外,研究发现白蒺藜、白芷、白茯苓、白芍、当归具有双向调节作用,而桃仁虽为白色,但却起着促进作用。结论:黑色或深色类药物促进酪氨酸酶活性的作用更明显,而白色或浅色类药物的抑制作用更明显。说明药材颜色与色素代谢调节存在一定的相关性,在色素代谢障碍性皮肤病的临床治疗中值得借鉴应用。

48味中药对体外培养鼠黑素瘤细胞黑素形成的影响

研究了４８味常用于色素障碍性皮肤病的中药水煎剂对鼠黑素瘤细胞Ｂ１６Ｆ１０细胞黑素形成的作用。结果：菟丝子、透骨草等１０种中药能促进黑素的形成，白芷、猪苓、白蔹等１０种中药能抑制黑素形成，白芨、白芍、黄芪、白鲜皮等２８种中药对黑素形成无明显作用。

黑素瘤免疫治疗的难点及对策

黑素瘤是高度恶性的免疫原性肿瘤,尽管以免疫检查点抑制剂为代表的免疫治疗可显著提高转移性黑素瘤患者的生存率,但仍有近半数患者对免疫治疗产生耐受和抵抗,且免疫相关不良反应发生率高。本文聚焦目前黑素瘤免疫治疗存在的耐受、抵抗及免疫相关不良反应等关键难点,总结相应的对策与研究进展。通过干预黑素瘤免疫抑制性微环境、筛选精准的生物标记物及优化免疫治疗联合策略等能够帮助解决免疫治疗耐受和抵抗的问题,同时传统免疫治疗与纳米技术的结合也可大幅减少免疫相关不良反应的发生。未来,对肿瘤免疫微环境更为广泛和深入的研究将有助于探索黑素瘤免疫治疗的最佳方式。