影响生物体内光敏剂运输和结合的立体化学因素

光动力治疗肿瘤的初始反应过程,是以肿瘤组织所结合的光敏剂吸收光能开始的。在分子水平上了解光敏剂的分子结构与光敏活性之间的关系,深入认识光敏剂与细胞内特定靶部位是怎样结合的,有助于阐明光敏剂在细胞内的分布、光动力作用的效率及其在暗条件下的毒性作用,对于认识光敏治疗的作用机理和录找开发新的光敏剂也有重要的理论和实际意义。有证据表明,肿瘤摄取某些卟啉类和酞菁类光敏剂以及它们的生物光敏活性,与光敏剂     

纳米光敏剂介导的靶向光动力治疗消化系统恶性肿瘤的研究进展

光动力疗法(photodynamic therapy,PDT)对多种疾病包括肿瘤、微生物感染等具有良好的治疗效果。PDT最重要的三个要素是:光敏剂、光源、氧。PDT主要是通过光敏剂在光照后产生光毒性,从而杀死相应的肿瘤细胞或者微生物。目前光敏剂的缺点主要是其疏水性,从而会在水相中聚集,并且有较低的肿瘤选择性。纳米光敏剂与传统的光敏剂相比,有疗效更高,亲水性、生物利用度、靶向性更强等优点。本文主要介绍纳米光敏剂靶向作用于消化道肿瘤的研究和新进展。     

纳米光敏剂介导光动力治疗皮肤肿瘤安全性与疗效研究进展

新型纳米光敏剂介导光动力治疗皮肤肿瘤研究发展迅速,但其安全性及疗效评价的规范性和系统性还有待加强。本文从体外细胞及在体动物两个水平综述了近年来纳米光敏剂介导光动力治疗皮肤肿瘤的安全性与疗效的研究进展,包括肿瘤靶向、细胞增殖活性、动物模型肿瘤抑制率、组织病理学、光动力效应评价等方面,并对现状进行了分析,旨在加强纳米光敏剂研发中安全性及疗效评价的规范性和系统性,促进其临床转化。     

顺铂耐药及非耐药肺癌细胞对竹红菌乙素的吸收及其光动力杀伤效应的比较

目的对比研究耐药及非耐药肺癌细胞株对竹红菌乙素(HB)-PDT的反应性,对比研究细胞耐药对光敏剂竹红菌素的吸收是否造成影响,探讨肿瘤细胞耐药的相关机制及HB-PDT对耐药肿瘤杀伤的可能性。方法(1)以不同浓度的竹红菌乙素(HB)分别孵育人肺腺癌细胞系A549细胞及经顺铂诱导耐药的多药耐药细胞系A549/DDP细胞,然后分别以铜蒸气激光混合光在饱和光剂量条件下进行照光处理,照光后置于37℃含5%CO2的孵箱中继续孵育24h,然后用MTT法分别测定不同HB浓度、不同细胞的存活率,分别绘制HB对2种细胞杀伤曲线并拟合曲线方程,根据方程求出HB对2种细胞的半数杀伤浓度(IC50)。根据曲线、拟合曲线方程及IC50比较经顺铂诱导耐药及非耐药细胞系HB-PDT杀伤效应有无差别。(2)对人肺腺癌细胞系A549细胞以及顺铂诱导的多耐药细胞系A549/DDP细胞进行光敏剂吸收实验,分别测定并绘制光敏剂被2种细胞吸收的标准曲线、浓度-含量关系曲线、时间-含量关系曲线,根据曲线及拟合方程比较分析2种细胞对光敏剂竹红菌素的吸收差异。结果HB-PDT对经顺铂诱导耐药及非耐药细胞系均具有很强的杀伤效应,二者无统计学差异(P>0·05):竹红菌乙素-PDT对A549细胞及A549/DDP细胞的半数杀伤浓度(IC50)分别为33·82ng/ml和34·19ng/ml。A549/DDP细胞与A549细胞对光敏剂吸收的标准曲线、浓度-含量关系曲线、时间-含量关系曲线均极为相似,顺铂诱导耐药的细胞系A549/DDP细胞与亲代细胞系A549细胞间对光敏剂的吸收无统计学差异(P>0·05)。2种细胞吸收曲线对比后未见到耐药细胞在光敏剂吸收过程中将光敏剂排出细胞外所引起的细胞内光敏剂含量降低,证实A549/DDP细胞中不存在将光敏剂“泵”出细胞外的作用。结论HB-PDT对经顺铂诱导耐药及非耐药细胞系均具有很强的杀伤作用。对顺铂产生多药耐药的肿瘤细胞与非耐药肿瘤细胞对HB的吸收无明显差别,因而对顺铂耐药的肿瘤细胞对于PDT仍然非常敏感。     

630 nm激光对血卟啉衍生物介导的人肺腺癌A549细胞体外杀伤效应及诱导凋亡实验研究

目的探讨波长630 nm激光对血卟啉衍生物(hematoporphyrin derivative, HPD)介导的人肺腺癌A549细胞的体外杀伤效应及诱导凋亡作用,为临床光动力治疗提供理论依据。方法将人肺腺癌A549细胞分别与不同浓度HPD (0、5、10、12、15和20μg/mL)孵育4h后,给予不同功率密度(0、25、50、75、100 mW/cm~2)的波长630 nm激光进行照射,同时设立单纯光敏剂组、单纯激光照射组及空白对照组。CCK8法检测细胞存活率;分组后进行Hoechst 33258染色法观察细胞凋亡情况;Anexin V-PI双染法检测细胞凋亡;RT-PCR检测Bcl-2、Survivin、Caspase-3、Bax mRNA表达水平。结果单独给予光敏剂或激光照射对人肺腺癌A549细胞无杀伤作用,两者联合时随光敏剂浓度及激光功率密度的增高杀伤效应明显。CCK8结果显示:15和20μg/mL HPD组A549细胞活力较对照组明显下降(P0.05)。50、75、100mW/cm~2功率密度组A549细胞活力与对照组比较明显下降(P 0.05); Hoechst 33 258染色显示:随着HPD浓度的增加,细胞呈现出染色质固缩、细胞核浓染;Annexin V-FITC/PI双染法检测空白对照组、单纯光照组、单纯光敏剂组、光动力治疗组凋亡率,组间比较差异具有统计学意义(P 0.05),光动力治疗组与空白组比较差异具有统计学意义(P 0.05);RT-PCR结果显示,HPD-PDT可以上调Bax、Caspase-3 mRNA水平及下调Bcl-2、Survivin mRNA水平。结论在体外630nm激光对HPD介导的人肺腺癌A549细胞有显著的杀伤作用,其机制与通过上调Caspase-3、Bax和下调Bcl-2、Survivin mRNA基因表达有相关性。     

五种竹红菌素衍生物对A549细胞的光动力效应研究

目的比较五种新型竹红菌素衍生物分别为竹红菌素乙素（hypocrellin,HB）的二位ω-氨基磺酸衍生物THB、3HB和4HB,及十七位ω-氨基磺酸衍生物3SB和4SB对体外培养的人肺腺癌上皮细胞（A549）的光动力（photodynamic therapy,PDT）效应,筛选光动力活性和安全性较好的竹红菌素衍生物。方法 （1）杀伤效应。将0.94 nmol/ml的5种新型竹红菌素衍生物和HB分别与A549细胞孵育4 h后,分别以波长630和532 nm激光照射,功率密度20 mW/cm2,照射时间1 000 s,能量密度20 J/cm2,照光后继续避光孵育24 h后采用MTT法测定细胞存活率。（2）安全系数。分别以波长532和630 nm激光照射,以血卟啉（hematoporph-yrin derivative,HpD）为对照光敏剂,研究17-4-amino-1-butane-sulfonic acid-hypocrellin B（4SB）对A549细胞的光动力效应及和暗毒性,并比较安全系数（暗毒性IC50/光毒性IC50）。结果 （1）杀伤效应。五种竹红菌素衍生物中,4SB在630和532 nm激光照射下对A549的光动力杀伤作用强于其它衍生物,接近HB。（2）安全系数。波长532 nm激光照射,4SB的光毒性分别为103.86和84.16 ng/ml是HpD 960.14 ng/ml的10.53和11.4倍,但前两者之间差异无显著意义（P〉0.05）;波长630 nm激光照射下,4SB光毒性的IC50为50.7 ng/ml,HpDIC50为1 069.88 ng/ml,暗毒性HpD、4SB分别为7.84、21.93μg/ml,安全系数4SB（432.5）〉HpD（7.3）。HpD在532和630 nm两波长下的光毒性IC50差异无显著意义（P〉0.05）,而4SB在532和630 nm两波长下的光毒性差异有显著意义（P〈0.05）。结论 5种衍生物可能成为有价值的光敏剂,值得进一步深入研究。     

光漂白对光动力疗法选择性的影响以及光漂白的机制

光漂白是光敏剂的重要性质,是光动力疗法治疗中的普遍现象,在光动力疗法治疗肿瘤和血管疾病中有利有弊.笔者总结了国内外文献对不同光敏剂光漂白机制和光漂白对光动力疗法选择性影响的论述.     

辐射增强启动子调控的p53基因联合照射对肿瘤细胞的作用

目的 研究辐射增强启动子调控的野生型-p53抑癌基因系统联合照射对人肿瘤细胞系HeLa和A549细胞的特异性杀伤作用。方法 构建辐射增强启动子pE6（TATA）-p53,Western blot检测不同射线剂量诱导下人肺腺癌A549细胞系和人宫颈癌HeLa细胞系中P53蛋白的表达水平,筛选出最适的照射剂量;AnnexinV-FITC试剂盒检测肿瘤细胞系早期凋亡率;利用克隆形成实验检测此系统对肿瘤细胞放射敏感性的影响。结果 在HeLa和A549细胞中,P53蛋白表达均受放射线诱导增高,且在6 Gy时辐射诱导活性最高;实验组质粒的细胞早期凋亡率与转染对照组质粒的细胞早期凋亡率相比有明显提高（F=11.018、10.736,P<0.05）。HeLa细胞和A549细胞的放射增敏比（SER）分别为2.56和2.36。结论 辐射增强启动子调控的p53基因系统具有显著的诱导肿瘤细胞凋亡的作用,可以提高肿瘤细胞的辐射敏感性,对肿瘤的治疗提供了新思路。     

通过grp启动子调控的可诱导性自杀基因疗法增强光动力治疗效果

光动力治疗(PDT)是一种很有希望的肿瘤治疗方法。它通过光照位于肿瘤内的光敏剂产生具有细胞毒性的单线念氧来杀伤靶组织，达到肿瘤治疗作用。虽然PDT的初期治疗效果通常是明显的，但也可能出现肿瘤复发，因此需要寻找增强PDT疗效的方法。研究发现，PDT在引起肿瘤细胞的直接杀伤效应及肿瘤内血管损伤作用的过程中所引发的氧化应激和缺     

HMME介导的光动力疗法诱导人肝癌细胞SMMC-7721凋亡的实验研究

目的:探讨光动力疗法对肝癌细胞SMMC-7721凋亡的影响。方法:以血卟啉单甲醚(HMME)为光敏剂,波长635nm激光为激发光源的光动力疗法作用于肝癌SMMC-7721细胞。细胞分别与浓度5、10、20、30μg/ml的光敏剂孵育4h后,用不同能量密度的激光照射。MTT法检测HMME的暗毒性以及光动力疗法作用24h后的细胞活性。Hoechst细胞     

Palmatine hydrochloride mediated photodynamic inactivation of breast cancer MCF-7 cells: Effectiveness and mechanism of action

Breast cancer is one of the commonest malignant tumors threatening to women. The present study aims to investigate the effect of photodynamic action of palmatine hydrochloride (PaH), a naturally occurring photosensitizer isolated from traditional Chinese medicine (TCM), on apoptosis of breast cancer cells. Firstly, cellular uptake of PaH in MCF-7 cells was measured and the cytotoxicity of PaH itself on breast cancer MCF-7 cells was estimated using the 3-(4, 5-dimethylthiazol-2-yl)-2, 5-diphenyltetrazolium bromide (MTT) assay. Subcellular localization of PaH in MCF-7 cells was observed using confocal laser scanning microscopy (CLSM). For photodynamic treatment, MCF-7 cells were incubated with PaH and then irradiated by visible light (470 nm) from a LED light source. Photocytotoxicity was investigated 24 h after photodynamic treatment using MTT assay. Cell apoptosis was analyzed 18 h after photodynamic treatment using flow cytometry with Annexin V/PI staining. Nuclear was stained using Hoechst 33342 and observed under a fluorescence microscope. Intracellular production of reactive oxygen species (ROS) was studied by measuring the fluorescence of 2, 7-dichlorofluorescein (DCF) using a flow cytometry. Results showed that PaH treatment alone had no or minimum cytotoxicity to MCF-7 cells after incubation for 24 h in the dark. After incubation for 40 min, the cellular uptake of PaH reached to the maximum, and PaH mainly located in mitochondria and endoplasmic reticulum of MCF-7 cells. Photodynamic treatment of PaH demonstrated a significant photocytotoxicity on MCF-7 cells, induced remarkable cell apoptosis and significantly increased intracellular ROS level. Our findings demonstrated that PaH as a naturally occurring photosensitizer induced cell apoptosis and significantly killed MCF-7 cells.     

Investigation of the strategies for targeting of the afterglow nanoparticles to tumor cells

Afterglow nanoparticles have been widely investigated as new agents for cancer imaging and as a light source for photodynamic activation for cancer treatment. For both applications, the targeting of the afterglow nanoparticles to tumor cells is an important and challenging issue. Here we report the strategies for targeting Sr₃MgSi₂O₈:Eu²⁺,Dy³⁺ afterglow nanoparticles to tumor cells by conjugating with variety of targeting molecules such as folic acid, RGD peptide, and R-11 peptide. For folic acid targeting, experimental observations were conducted on PC-3 cells (folate receptor negative), MCF-7 (folate receptor positive), and KB cells (folate receptor positive) to compare the cellular uptake and confirm targeted delivery. For the cyclic RGDfK peptide, experiments were carried out on the integrin α_vβ₃ positive MDA-MB-231 breast cancer cell line and the integrin α_vβ₃ negative MCF-7 breast cancer cell lines in order to compare the cellular uptakes. As for R11-SH peptide, cellular uptake of the afterglow nanoparticles was observed on LNCaP and PC3 prostate cancer cell lines. All the observations showed that the cellular uptakes of the nanoparticles were enhanced by conjugation to variety of targeting molecules which are specific for breast and prostate cancer cells.     

双启动子杆状病毒介导131I肿瘤靶向治疗的实验研究

目的构建由人端粒酶逆转录酶（hTERT）启动子调控的N1S基因以及由早期生长应答因子1（Egr1）启动子调控的人纤溶酶原Kringle5（K5）基因的双启动子重组杆状病毒载体,探讨同时靶向肿瘤细胞与血管内皮细胞的基因治疗模式的可行性。方法将hTERT启动子和N1S基因片段以及Egr1启动子和麟基因片段分别亚克隆至杆状病毒载体,经草地贪夜蛾卵巢细胞（Sf9）包装并扩增得到重组杆状病毒（Bac—hTERT-N1S—Egr1-K5）,同时将CMV启动子调控的重组杆状病毒（Bac—CMV-NIS—Egr1-K5）以及不含NIS基因或不含硒基因的重组杆状病毒（Bac—hTERT-O—Egrl-K5、Bac-hTERT-NIS—Egr1-0）作为对照组。采用荧光定量PCR及Westernblot分析NISmRNA和蛋白在人宫颈癌细胞HeLa中的靶向表达,以及131I辐射对K5mRNA和蛋白的表达调控。通过摄碘实验、NaClO4抑制实验以及细胞增殖抑制实验验证NIS蛋白的功能及由其介导的131I抑瘤作用。通过细胞凋亡实验评估K5蛋白对人脐静脉内皮细胞（HUVEC）的促凋亡作用。统计学检验采用方差分析。结果成功构建重组杆状病毒Bac—hTERT-NIS—Egr1-K5。荧光定量PCR及Westernblot显示肿瘤特异性启动子hTERT介导的NIS基因仅在HeLa细胞中有表达,而在正常肺纤维细胞MRC5中无表达。131I可以调控辐射敏感启动子Egr1下游您基因的转录和翻译。细胞摄碘实验显示Bac-hTERT-NIS—Egr1-K5感染的HeLa细胞摄碘增加了5．6倍,与未加NaClO4组比,其摄碘能被NaClO4显著抑制（F=199．296,P〈0．05）。131I对Bac—hTERT-NIS—Egr1-K5感染的HeLa细胞的抑制效果明显,细胞存活率仅为38．3％。Bac—hTERT-NIS—Egrl一K5感染的HUVEC细胞在131I照射下的凋亡率（30．8％）显著高于Bac．hTERT-NIS—Egr1-0组和未加病毒组（11．2％和10．9％,F=19．926、45．409,均P〈0．05）。结论重组杆状病毒Bac-hTERT-NIS—Egrl．K5可使NIS基因在肿瘤细胞?     

聚乙二醇和核酸适配体AS1411修饰的金纳米粒子对人宫颈癌HeLa细胞放射敏感性的影响

目的 研究聚乙二醇(PEG)和核酸适配体AS1411修饰的金纳米粒子(AuNPs)对人宫颈癌HeLa细胞辐射敏感性的影响。方法 用PEG和PEG-AS1411分别修饰经柠檬酸钠还原法制备的AuNPs,制备纳米粒子AuNPs@PEG和AuNPs@PEG-AS1411。分别用CCK-8法和克隆形成法检测纳米粒子的细胞毒性。用电感耦合等离子体质谱仪(ICP-MS)检测HeLa细胞对纳米粒子的吸收量。用克隆形成法检测纳米粒子联合X射线照射对HeLa细胞存活率的影响。结果 CCK-8实验结果显示,AuNPs@PEG和AuNPs@PEG-AS1411对HeLa细胞的毒性很小(P>0.05),而克隆形成实验结果则显示,10 d后HeLa细胞的存活率明显降低(t=4.38~11.60,P<0.05)。用AS1411修饰AuNPs,可以增加细胞对AuNPs的吸收。AuNPs@PEG和AuNPs@PEG-AS1411对HeLa细胞均具有辐射增敏作用(F=7.90、48.23,P<0.05),Au浓度为10 mg/ L时,其增敏比分别为1.12和1.20。结论 AuNPs@PEG和AuNPs@PEG-AS1411对HeLa细胞的急性细胞毒性较小,但具有长期毒性。用AS1411修饰PEG化的AuNPs,可以增强AuNPs的放射增敏作用。     

Photodynamic action of palmatine hydrochloride on colon adenocarcinoma HT-29 cells

Palmatine hydrochloride (PaH) is a natural active compound from a traditional Chinese medicine (TCM). The present study aims to evaluate the effect of PaH as a new photosensitizer on colon adenocarcinoma HT-29 cells upon light irradiation. Firstly, the absorption and fluorescence spectra of PaH were measured using a UV–vis spectrophotometer and RF-1500PC spectrophotometer, respectively. Singlet oxygen (¹O₂) production of PaH was determined using 1, 3-diphenylisobenzofuran (DPBF). Dark toxicity of PaH was estimated using the 3-(4, 5-dimethylthiazol-2-yl)-2, 5-diphenyltetrazolium bromide (MTT) assay. Cellular uptake of PaH in HT-29 cells was detected at different time intervals. Subellular localization of PaH in HT-29 cells was observed using confocal laser fluorescence microscopy. For photodynamic treatment, HT-29 cells were incubated with PaH and then irradiated by visible light (470 nm) from a LED light source. Photocytotoxicity was investigated 24 h after photodynamic treatment using MTT assay. Cell apoptosis was observed 18 h after photodynamic treatment using a flow cytometry with Annexin V/PI staining. Results showed that PaH has an absorption peak in the visible region from 400 nm to 500 nm and a fluorescence emission peak at 406 nm with an excitation wavelength of 365 nm. PaH was activated by the 470 nm visible light from a LED light source to produce ¹O₂. Dark toxicity showed that PaH alone treatment had no cytotoxicity to HT-29 cancer cells and NIH-3T3 normal cells after incubation for 24 h. After incubation for 40 min, the cellular uptake of PaH reached to the maximum and PaH was located in mitochondria. Photodynamic treatment of PaH demonstrated a significant photocytotoxicity on HT-29 cells. The rate of cell death increased significantly in a PaH concentration-dependent and light dose-dependent manner. Further evaluation revealed that the early and late apoptotic rate of HT-29 cells increased remarkably up to 21.54% and 5.39% after photodynamic treatment of PaH at the concentration of 5 μM and energy density of 10.8 J/cm². Our findings demonstrated that PaH as a naturally occurring photosensitizer has potential in photodynamic therapy on colon adenocarcinoma.     

光动力治癌新药血卟啉单甲醚（HMME）的研究

本文报道了一种单体卟啉血卟啉单甲醚的合成及其光敏化力、人癌细胞光灭活作用、动物移植瘤光动力疗效和有关的临床前药理毒理学研究资料。实验结果表明,与临床应用的混合卟啉制剂血卟啉衍生物(HpD)相比,HMME具有光敏化力强、肿瘤选择性摄入率高、光动力效应强、毒性低、无致突变和致畸胎作用等优点,是一种较理想的光动力治癌新药。     

In-Vitro Use of Verteporfin for Photodynamic Therapy in Glioblastoma

BackgroundStummer et al. established fluorescence-guided surgery (FGS) for glioblastoma (GBM) using 5-aminolevulinic acid (5-ALA). Its metabolite, protoporphyrin IX (PPIX), is also a photosensitizer and can be used for photodynamic therapy (PDT) using a laser beam of 635 nm. The porphyrin derivate verteporfin (VP) was discovered to have properties to penetrate the brain, pharmacologically target glioma cells, and is approved for PDT of choroidal neovascularization in wet age-related macular degeneration at 689 nm.ObjectiveTo elucidate whether GBM cell lines are susceptible to PDT with second-generation photosensitizer VP.MethodsHuman glioma cell lines LN229, HSR-GBM1, and a low-passage patient-derived GBM cell line P1 were treated with variable concentrations of VP for 24 h, followed by PDT at 689 nm using a diode laser light. Cell viability was measured using the MTT assay and VP uptake was measured using a desktop cytometer.ResultsSignificantly higher cell death following PDT with VP compared to VP treatment alone or no treatment was detected in all cell models (LN229, HSR-GBM1, P1). Flowcytometric measurements revealed a concentration-dependent cellular uptake of VP after 24 h incubation up to 99% at 10 µM (HSR-GBM1).ConclusionThis study demonstrates that PDT with VP causes cell death in GBM cells at marginal concentrations. Additionally, red spectrum fluorescence was detected at therapeutic concentrations in all cell lines, validating the cellular uptake of VP in GBM cells. VP, therefore, is not only a potential drug for targeting GBM pharmacologically but can be used as an optical imaging dye in surgery and photosensitizer to make GBM susceptible to PDT.     

Photodynamic therapy using a cytotoxic photosensitizer porphyrus envelope that targets the cell membrane

BackgroundSubcellular localization of a photosensitizer is known to determine the therapeutic efficacy of photodynamic therapy (PDT). Cell membrane is an optimal target that promises an effective treatment outcome.ObjectivesWe previously developed a novel photosensitizer named porphyrus envelope (PE) by combining hemagglutinating virus of Japan envelope (HVJ-E) with lipidated protoporphyrin IX (PpIX lipid). In the current study, the cellular localization of PE and its ability to induce multiple anti-tumor effect were characterized.Materials and MethodsThe localization and uptake of PpIX lipid in cells were evaluated with confocal laser scanning microscopy and a cell-based fluorescent assay, respectively. The ability of PE to suppress the migration and proliferation of cancer cells was assessed using a scratch-wound assay. The synergistic effect of PDT and HVJ-E treatment was evaluated using an in vitro experiment with PC-3 cells.ResultsPE localized along the cell membrane and PpIX lipid accumulated selectively in the prostate cancer cells within 10 min. Also, PE maintained the ability to undergo fusion and induce cancer cell death even after light irradiation at the dose for PDT. Incubation with PE resulted in delayed migratory and proliferative activity of PC-3 cells. PE-mediated PDT was twice as effective when cells were further incubated with PE following PDT.ConclusionsPE allows rapid drug delivery targeting the cell membrane. Because the cytotoxicity of HVJ-E was maintained, synergistic effect of HVJ-E and the photochemical reactions resulted in highly effective killing of prostate cancer cells in vitro and thus represents a promising treatment for prostate cancer.     

Comparison study on the effect of gold nanoparticles shape in the forms of star,hallow, cage,rods, and Si-Au and Fe-Au core-shell on photothermal cancer treatment

Gold nanoparticles (GNPs) indicate potential in the development of cancer treatments as vehicles for thermal damage of cancer cells because of their photothermal heating capability. Herein, we aim to investigate the effect of GNPs geometry as photothermal transducers on cellular uptake and photothermal therapy (PTT) efficacy.For this aim, seven different shapes of anisotropic GNPs: stars, hollow, rods, cages, spheres, Fe-Au, and Si-Au core shells were synthesized and investigate the effect of shape on GNPs optical properties. The physic-chemical characterization of prepared GNPs was investigated by UV–vis, DLS-Zeta, and TEM analysis. The effect of GNPs geometry on cellular uptake was investigated by ICP-MS and flow cytometry method. The PTT potential of these GNPs was compared on MCF7 cells in vitro using MTT assay, cell cycle, and Annexin-V apoptosis assay.While all these GNPs could absorb and convert near-infrared light into heat, gold nanostars exhibited the lowest cytotoxicity, highest cellular uptake and highest heat generation compared to other structures. Following photothermal treatment, due to substantial heat production in MCF7 cells, the apoptosis induction rate was greatly increased for all anisotropic gold nanostructures (stars, hollow, rods, and cages) especially gold nanostars.Combined, we can conclude that GNPs geometry affects cellular uptake and heat generation amount as well as cell destruction by apoptosis pathway. The gold nanostar is promising candidates for photothermal destruction.     

铜蒸气激光照射下11种光敏剂杀伤强度的比较

目的　检测目前国内常用的和中国科学院化学研究所合成的共 11种光敏剂 ,比较它们对细胞杀伤效应的强弱 ,筛选出适于临床应用的新型光敏剂。方法　将乳腺癌MDAMB 5 4 3细胞接种于 96孔培养板 ,然后加入用RPMI16 4 0培养基配置的不同浓度的不同光敏剂 ,4h后照光 ,2 4h后用四唑盐比色法测定细胞存活率。以血卟啉衍生物 (HpD)作为标准对照。结果　在 5 10 6nm和 5 78 2nm的混合光照射下 ,竹红菌素A(HA)、竹红菌素B(HB)和 5 ,15 二芳基 2 ,3 二羟基卟吩 (DPCOH)比HpD有更强的杀伤效应。血啉甲醚 (HMME)的杀伤效应是HpD的 1 2左右。其他的一些化合物在此波长条件下杀伤效应较差 ,其中一些是因其溶解性不好而不能完全发挥其杀伤效能。结论　竹红菌素类光敏剂和DPCOH是很有应用开发前景的新型光敏剂