Functional study on galactose-specific lectin 3 from tumor-associated macrophage based on single-cell sequencing / 中国肿瘤生物治疗杂志

@#[摘 要] 目的：从肿瘤相关巨噬细胞（TAM）在化疗前后的表型变化入手，寻找通过调控肿瘤免疫微环境（TIME）从而影响肿瘤治疗效果和预后的功能分子。方法：利用欧洲核苷酸数据库（ENA）的PRJEB45598数据集，分析进展期胃癌患者化疗前后活检肿瘤组织单细胞测序数据，采用主成分分析（PCA）和一致流形近似与投影（UMAP）降维，获得31个亚群细胞，并进一步进行TAM亚型分析、差异基因筛选，寻找化疗后M2型TAM中高表达的基因。通过黑色素瘤B16-F10细胞皮下移植瘤模型验证化疗前后特定基因mRNA和蛋白水平表达变化，并通过Incucyte体外分析该蛋白是否调控化疗药物诱导的肿瘤细胞死亡。结果：聚焦单细胞测序数据中M2型TAM的特征表达基因，发现半乳糖凝集素3（LGALS3）在胃癌化疗后mRNA水平显著升高（P<0.01），在多种肿瘤中LGALS3高表达且与患者生存期呈负相关（P<0.05或P<0.01）。黑色素瘤B16-F10细胞移植瘤模型中，LGALS3在M2型TAM中高表达（P<0.01），且奥沙利铂化疗后表达进一步升高（P<0.05）。体外对肿瘤细胞给予重组LGALS3蛋白可抑制化疗药物奥沙利铂诱导的肿瘤细胞死亡（P<0.01）。结论：奥沙利铂化疗后的M2型TAM通过合成和分泌LGALS3促进黑色素瘤细胞的化疗抵抗，因此通过免疫治疗的方法靶向LGALS3分子可能有效提高肿瘤的治疗效果。

Preparation of liposome coated hollow copper sulfide nano-enzyme and their combined laser irradiation to against melanoma B16-F10 cells / 中国肿瘤生物治疗杂志

@#[摘 要] 目的：构建中空硫化铜纳米酶脂质复合载体CuS@LIP并探讨其联合激光照射杀伤黑色素瘤B6-F10细胞的效果与机制。方法：构建（2,3-二油酰基-丙基）-三甲胺-丙烷（氯盐）（DOTAP）阳离子脂质体包被硫化铜纳米载体CuS@LIP，研究不同质量浓度的CuS与CuS@LIP在1 064 nm激光照射下的光热性能和热稳定性，通过H2O2与3,3',5,5'-四甲基联苯胺（TMB）催化活性检测体系检测CuS@LIP的类过氧化物活性；用系列质量浓度梯度的CuS、CuS@LIP在有/无激光条件下分别处理B16-F10细胞，CCK-8法检测细胞的存活率，Calcein-AM/PI染色法、Annexin Ⅴ-FITC/PI染色法结合流式细胞仪分别检测20 μg/mL CuS或CuS@LIP在激光照射或非激光照射条件下对B16-F10细胞活力和凋亡的影响。结果：成功制备的CuS@LIP的平均粒径为（178.23±6.46）nm，平均Zeta电位为（20.47±0.93）mV；在激光照射下，80 μg/mL CuS@LIP最高温度可达65.4 ℃，比单纯CuS的63.4 ℃更高；经3个激光开关周期测试，CuS@LIP终点温度基本保持不变；此外，CuS@LIP与CuS具有相同的类过氧化物酶催化活性。低于20 μg/mL的CuS@LIP在体外对B16-F10细胞的增殖活性没有明显影响（P>0.05），但联合激光照射后细胞存活率明显降低（29.76±3.60）% vs （87.95±8.18）%，P<0.000 1，细胞凋亡率显著升高[（19.34±4.41）% vs （13.36±0.86）%，P<0.01]。结论：制备的CuS@LIP具有符合设计要求的理化性质、良好的光热性能和优异的类过氧化物酶催化活性，其与激光照射联合后显示出更优异的杀伤B16-F10细胞的效果。

Construction of a MnO2/Crudlan composite hydrogel and its killing effect on melanoma B16-F10 cells combined with photothermal therapy / 中国肿瘤生物治疗杂志

@#[摘 要] 目的：构建负载二氧化锰（MnO2）纳米颗粒的可得然（Cur）复合水凝胶MnO2@Cur（简称MGel），研究其对黑色素瘤B16-F10细胞的杀伤效果。方法：采用热诱导法制备Cur水凝胶（Gel），物理负载MnO2构建MGel，表征其宏观和微观形貌，检测其机械性能、降解性能以及光热转换性能等理化性能，并研究其联合PTT对小鼠皮肤黑色素瘤B16-F10细胞的光热杀伤效果。结果：MGel具有优异的机械和可降解性能，抗拉伸强度达（127.97±3.60）kPa、抗压缩强度达（151.44±5.23）kPa，28 d降解率约58.17%。MGel负载MnO2纳米片（粒径约180 nm）获得优异的光热转换性能，负载1.0 mg/mL MnO2的MGel在1.0 W/cm2的808 nm NIR光照4 min后到达最高温度50 ℃。细胞毒性实验和Calcein-AM/PI荧光双染色实验表明，MGel联合PTT有效杀伤B16-F10黑色素瘤细胞，NIR光照使得MGel组细胞存活率降低至（4.68±0.66）%（P<0.000 1）。结论：MGel复合水凝胶具备优异的机械性能、可降解性能以及光热转换性能，其联合PTT能有效杀伤肿瘤细胞，可能成为一种有效治疗黑色素瘤的新手段。

The inhibitory effect of curcumin on B16F10 cells and its mechanism / 中国药理学通报

Aim To investigate the effect of curcumin extract on melanin production and melanosome transport, and to explore the possible mechanism of the curcumin extract on microenvironment. Methods (1) B16F10 and HaCaT cells were cultured with different concentrations of curcumin. The proliferation ability was detected by MTT method. Melanin synthesis and tyrosinase activity in B16F10 cells were detected by NaOH pyrolysis method and Oxidation dopamine response in vitro. The expression levels of key proteins were detected by Western blot. (2) B16F10 cells were cultured with different concentrations of ISG15 protein. NaOH pyrolysis method and Oxidation dopamine response in vitro were used to detect melanin synthesis and tyrosinase activity in B16F10 cells. Results Curcumin could directly inhibited tyrosinase activity and melanin production, and inhibit melanocyte migration within a certain concentration range. ISG15 protein could enhance the melanin production, tyrosinase activity. Curcumin could reduce the expression of the ISG15 in HaCaT cell, change the microenvironment of melanocyte, and indirectly inhibit melanin synthesis through ISG15. Conclusions In addition to directly inhibiting melanin synthesis, curcumin can also play an indirect role in inhibiting melanin synthesis by inhibiting the expression of ISG15 protein and altering the microenvironment of melanocytes.

Regulation of LncRNA00067110 on Proliferation, Apoptosis and Melanins Production of B16-F10 Cells by Targeting Cabyr / 中国生物化学与分子生物学报

Long non-coding RNA (lncRNA) is a type of non-coding RNA with the more than 200 nucleotides. Several lncRNAs have been identified as the potential targets for cancer therapy. LncRNA00067110 is one of the differentially expressed genes in the transcriptome profiles of melanoma B16-F10 cells compared to normal mice melanocytes. To investigate whether lncRNA00067110 regulates the proliferation, apoptosis and melanogenesis of B16-F10 cells, the calcium-binding tyrosine phosphorylation regulated protein (Cabyr) target gene was predicted by LncTar and verified by dual luciferase activities. The regulating function of lncRNA00067110 was investigated by the analysis of transcriptome profiles and to detect the proliferation, apoptosis and melanin production of B16-F10 cells transfected by the overexpression plasmids of lncRNA00067110. The results showed that the relationship of lncRNA00067110 targeting Cabyr, the mRNA and protein levels of proliferation (MEK/ERK/MNK/CREB) and melanogenesis-related genes (TYR family and CREB) were significantly down-regulated, while the mRNA and protein levels of apoptosis-related genes (AKT and Bcl-2) were up-regulated in B16-F10 cells with lncRNA00067110 overexpression. The transcriptome profile of B16-F10 cells with lncRNA00067110 overexpression showed that 17 genes were differentially expressed, among which Cabyr was up-regulated. Furthermore, the effect of lncRNA00067110 on the phenotypes of cell proliferation and apoptosis were verified. The results suggested that lncRNA00067110 might be a novel target for the treatment of melanoma by targeting Cabyr, which regulate the expression of related genes to inhibit the proliferation and melanogenesis, as well as to induce the apoptosis of B16-F10 cells.

Effect of lncRNA CDKN2B-AS1 on malignant biological behaviors of melanoma B16-F10 cells / 中国肿瘤生物治疗杂志

@#Objective: To investigate the effect of long non-coding RNA CDKN2B antisense RNA 1 (CDKN2B-AS1) on malignant biological behaviors of melanoma B16-F10 cells by targeting miR-7-5p. Methods: Melanoma B16-F10 cells were chosen for this study. shRNA CDKN2B-AS1 vector was constructed and transfected into B16-F10 cells. The experimental cells were divided into control group, sh-CDKN2B-AS1 group, miR-7-5p mimic group and miR-7-5p inhibitor group. The expression level of CDKN2B-AS1 mRNA in the transfected B16-F10 cells was detected by RT-PCR; the number of clone formation and the proliferation ability of the cells were detected by Clone formation assay and MTT assay; and the migration and invasion ability of the cells were detected by Scratch-healing assay and Transwell assay. The targeting relationship between CDKN2B-AS1 and miR-7-5p was detected by Luciferase reporter gene assay. The mRNA expression of miR-7-5p and protein expressions of Ki67, cleaved caspase-3, E-cadherin, N-cadherin and Twist1 in B16-F10 cells after transfection with miR-7-5p mimics/inhibitor were detected by RT-PCR and Western blotting, respectively. Results: Compared with the control group, the expression level of CDKN2B-AS1 mRNA in B16-F10 cells of sh-CDKN2B-AS1 group was significantly decreased (P<0.01); the proliferation, migration and invasion ability of cells were significantly decreased (all P<0.01). Luciferase reporter gene assay showed that CDKN2B-AS1 directly targeted miR-7-5p. The mRNAexpression of miR-7-5p, and protein expressions of cleaved caspase-3 and E-cadherininsh-CDKN2B-AS1groupandmiR-7-5pmimic group were significantly up-regulated (all P<0.05), whiletheproteinexpressionsofKi67,N-cadherin,andTwist1weresignificantlydown-regulated (all P<0.05). Conclusion: CDKN2B-AS1 targets miR-7-5p to promote the development of melanoma, and interfering with CDKN2B-AS1 can inhibit the malignant biological behaviors of melanoma B16-F10 cells.

The effects of green tea (Camellia sinensis) flower extracton melanin synthesis in B16-F10 melanoma cells / 대한수의학회지

The present study observed the effects of a green tea (Camellia sinensis) flower extract (GTFE) on melanin synthesis in B16-F10 melanoma cells. GTFE exhibited antioxidant activity on 2,2-diphenyl-1-picrylhydrazyl and inhibited mushroom tyrosinase activity in a dose-dependent manner. Furthermore, GTFE significantly diminished α-melanocyte stimulating hormone (α-MSH) stimulated cellular melanin content and tyrosinase activity throughout the concentration range evaluated. Based on RNA sequencing analysis, differential gene expression patterns observed in α-MSH stimulated B16-F10 melanoma cells were normalized by the addition of GTFE. In particular, the expression levels of melanoregulin and tyrosinase genes which are key regulating genes in melanin synthesis were up-regulated by 3.5 and 3 fold respectively by α-MSH, and were normalized to control levels by the addition of GTFE. The results suggest that GTFE inhibits melanin synthesis in α-MSH stimulated B16-F10 melanoma cells by normalizing expression of genes that are essential for melanin synthesis. Overall, the results suggest that GTFE could be applied in the development of a whitening agent for the treatment of dermal hyperpigmentation.

In vitro anti-tumor effect of mGM-CSF-GnRH3 and mGM-CSF-GRP6 recombinant fusion protein and theirbioinformatics prediction / 中国肿瘤生物治疗杂志

@#Objective: To prepare the fusion protein mGM-CSF-GnRH3 (mGGn) of mouse granulocyte-macrophage colony stimulating factor (mGM-CSF) combining with gonadotropin releasing hormone (GnRH) and the fusion protein mGM-CSF-GRP6 (mG6) of mGM-CSF combining with gastrin-releasing peptide (GRP), and to investigate the inhibitory effect of the above two fusion proteins on B16F10 melanoma in vitro as well as to preliminarily predict their isoelectric point, relative molecular weight, hydrophobicity, stability, subcellular localization, signal peptide, spatial structure and potential epitopes. Methods:After the successful preparation of mGGn and mG6, the effects of different concentrations of fusion proteins on tumor cell morphology, migration, proliferation and cell cycle were detected by microscopic observation, scratch test, CCK-8 method and flow cytometry, respectively. The protein online analysis systems EXPASY, GOR4, SWISS MODEL were used to predict the basic properties and secondary/tertiary structure of recombinant fusion proteins. The B cell epitopes were predicted by IEDB and ABCpred software, the CTL epitopes were comprehensively predicted by SYFPEITHI, BlMAS and NetCTL software, and the Th epitopes were predicted by NetMHCIIpan 3.1 Server and IEDB software. Results:Both mGGn and mG6 inhibited the migration and proliferation of tumor cells. mGGn could block B16F10 cell cycle at G1 phase while mG6 could block B16F10 cell cycle at S phase, all of which prevented cells entering into G2 phase to inhibit tumor cell growth. The mGGn and mG6 fusion proteins got diverse structures and had multiple potential B epitopes, CTL epitopes and Th epitopes. Conclusion: mGGn and mG6 have inhibitory effect on B16F10 melanoma in vitro, and bioinformatics predictions have laid a foundation for further study of the biological functions and immunological activities of these fusion proteins.

In vitro dissolution and anti-vitiligo activity of isopsoralen nanostructured lipid carriers / 中草药

Objective To evaluate the in vitro dissolution characteristic of IPRN-NLC and to study its effects on B16F10 cells proliferation, melanin synthesis, and tyrosinase activity. Methods The dynamic dialysis was employed to compare the in vitro dissolution of IPRN and IPRN-NLC; MTT assay was used to detect the proliferation of B16F10; The tyrosinase activity was determined by L-DOPA-oxidation; The melain content was determined by GENMED Cell Melanin Quantitative Assay Kit. Results The accumulation dissolution of IPRN-NLC was 67.31% within 72 h, which showed sustained release; While the dissolution of IPRN-suspension, IPRN-physical mixture, and IPRN-DMSO were 53.34%, 90.30%, and 98.67%, respectively. The IPRN-NLC could significantly promote the proliferation, tyrosinase activity and melanin content compared with IPRN DMSO groups (P < 0.05) at the same concentration. Conclusion IPRN-NLC could increase the solubility of the drug with sustained release, and showed good cell biology intermiscibility, which could significantly increase the effects on B16F10 cells.

Establishment of a C57BL/6 J mouse model of metastatic melanoma in the lung / 中国实验动物学报

Objective To investigate the influencing factors involved in the establishment of a C57BL/6 J model of metastatic melanoma in the lung,including the way of tumor inoculation,the number of inoculated cells and the time of tumor formation. Methods Mouse melanoma B16F10 cells were cultured in vitro. 1)Eighteen healthy male C57BL/6 J mice were randomly divided into three groups. Mice in each group received 100 μL cell suspension(including 3 ×106 melanoma cells)via intravenous,intraperitoneal and subcutaneous injection,respectively. After two weeks,the mice were killed and dissected,and the tumor growth and metastasis were observed. 2)Eighteen male mice were randomly divided into three groups. Mice in each group were injected with 3 ×106cells,1 ×106cells, and 3 ×105cells through the tail vein,respectively. After two weeks,mice were killed and dissected,and the tumor growth and metastasis were observed. 3)Eighteen male mice were randomly divided into three groups. Mice in each group were injected with 1×106cells though the tail vein. Mice were killed and dissected after one week, two weeks and three weeks, respectively. The growth and metastasis of tumor were observed. Results 1)The success rate of lung metastasis was 100% in the mice with intravenous injection,but not in mice receiving intraperitoneal injection and subcutaneous injection. 2)The size of metastatic melanoma nodules were moderate in mice inoculated by 1 ×106cells. The number of melanoma metastatic foci was too high in the mice inoculated with 3 ×106cells,but too low in the mice inoculated with 3 ×105cells. 3)Significant metastatic melanoma foci were observed in the mice killed and dissected after two weeks with no death. The number of melanoma foci in the lung was too high in the mice killed after three weeks,while was too low in the mice killed at one week after tumor cell inoculation. Conclusions Intravenous injection of 1×106mouse melanoma cells into C57BL/6 J mice and killed after two weeks is an optimal method for establishment of a mouse model of metastatic melanoma in the lung, and is worth of recommendation.

In vitro effect of fenretinide-loaded liposomes on proliferation, apoptosis and migration of malignant melanoma cells / 中华皮肤科杂志

Objective To evaluate the effect of fenretinide (4-HPR)-loaded liposomes (4-HPR-L) on the proliferation,apoptosis and migration of A375 and B16F10 melanoma cells.Methods A film-ultrasonic dispersion method was used to prepare 4-HPR-L.In vitro cultured A375 cells,as well as B16F10 melanoma cells,were divided into the following groups:blank control group treated with fresh culture medium alone,4-HPR groups treated with 4-HPR at concentrations of 0.1,1,15,30,50 and 70 mg/L separately,and 4-HPR-L groups treated with 4-HPR-L at concentrations of 0.1,1,15,30,50 and 70 mg/L separately.Cell counting kit-8 (CCK8) assay was conducted to detect cell proliferation,Hoechst33258 staining and flow cytometry to detect cell apoptosis,wound healing assay to evaluate cell migration ability,and laser scanning confocal microscopy to observe endocytic uptake of the liposomes.Statistical analysis was done by one-way analysis of variance (ANOVA) for intergroup comparison,and a two-sample t-test for comparisons between 2 groups with SPSS 20.0 software.Results Both 4-HPR and 4-HPR-L showed inhibitory effects on the proliferation of A375 and B16F10 melanoma cells.After 48-hour treatment,the survival rates of A375 cells in the 0.1-,1-,15-,30-,50-and 70-mg/L 4-HPR groups were (94.3 ± 1.4)％,(91.7 ± 2.5)％,(84.4 ± 2.5％),(78.8 ± 2.1)％,(59.0 ± 1.1)％ and (42.8 ± 2.0)％ respectively,and those in the 0.1-,1-,15-,30-,50-and 70-mg/L 4-HPR-L groups were (86.0 ± 0.2)％,(76.5 ± 0.6)％,(60.9 ± 1.5)％,(49.0 ± 0.5)％,(32.9 ± 0.2)％ and (18.9 ± 0.5)％ respectively.After 48-hour treatment,the survival rates of B16F10 cells in 0.1-,1-,15-,30-,50-and 70-mg/L 4-HPR groups were (95.4 ± 1.9)％,(90.5 ± 2.6)％,(77.0 ± 0.8％),(64.4 ± 3.5)％,(59.1 ± 2.9)％ and (49.9 ± 1.9)％ respectively,and those in the 0.1-,1-,15-,30-,50-and 70-mg/L 4-HPR-L groups were (88.4 ± 2.0)％,(80.9 ± 3.4)％,(60.9 ± 2.2)％,(51.5 ± 2.9)％,(41.1 ± 1.2)％ and (33.5 ± 2.4)％ respectively.The survival rates of A375 and B16F10 cells were significantly higher in the 0.1-,1-,15-,30-,50-and 70-mg/L 4-HPR groups than in the 4-HPR-L groups at the same concentrations (A375 cells:t =8.019,8.298,11.455,19.978,33.672,16.314 respectively,all P ＜ 0.01;B16F10 cells:t =3.573,3.153,9.953,4.019,8.097,7.53 respectively,all P ＜ 0.05).Hoechst33258 staining showed that the morphology of the melanoma cells in the control group and 4-HPR groups did not change obviously,but the cells.in the 4-HPR-L groups became smaller,with the cytoplasm concentrated,nuclei dissociated into fragments,and apoptotic bodies formed.Flow cytometry showed that the apoptosis rates of A375 and B16F10 cells were significantly higher in the 4-HPR-L groups than in the 4-HPR groups (all P ＜ 0.01).Cell wound healing assay showed that the inhibitory effect of 4-HPR-L on the migration of cells was stronger than that of 4-HPR,and 4-HPR-L could markedly decrease the degree of wound healing.Laser scanning confocal microscopy showed that C6 liposomes could be rapidly and successfully internalized into both A375 and B16F10 cells.Conclusion The 4-HPR-L can be internalized into A375 and B16F10 cells better than 4-HPR,effectively inhibit the proliferation and migration of A375 and B16F10 cells,and induce the apoptosis of these cells.

Psychotria viridis: Chemical constituents from leaves and biological properties

ABSTRACT The phytochemical study of hexane, chloroform and methanol extracts from leaves of Psychotria viridis resulted in the identification of: the pentacyclic triterpenes, ursolic and oleanolic acid; the steroids, 24-methylene-cycloartanol, stigmasterol and β-sitosterol; the glycosylated steroids 3-O-β-D-glucosyl-β-sitosterol and 3-O-β-D-glucosyl-stigmasterol; a polyunsaturated triterpene, squalene; the esters of glycerol, 1-palmitoylglycerol and triacylglycerol; a mixture of long chain hydrocarbons; the aldehyde nonacosanal; the long chain fat acids hentriacontanoic, hexadecanoic and heptadenoic acid; the ester methyl heptadecanoate; the 4-methyl-epi-quinate and two indole alkaloids, N,N-dimethyltryptamine (DMT) and N-methyltryptamine. The chemical structures were determined by means of spectroscopic (IR, 1H and 13C NMR, HSQC, HMBC and NOESY) and spectrometric (CG-MS and LCMS-ESI-ITTOF) methods. The study of biologic properties of P. viridis consisted in the evaluation of the acetylcholinesterase inhibition and cytotoxic activities. The hexane, chloroform, ethyl acetate and methanol extracts, the substances 24-methylene-cycloartanol, DMT and a mixture of 3-O-β-D-glucosyl-β-sitosterol and 3-O-β-D-glucosyl-stigmasterol showed cholinesterase inhibiting activity. This activity induced by chloroform and ethyl acetate extracts was higher than 90%. The methanol and ethyl acetate extracts inhibit the growth and/or induce the death of the tumor cells strains B16F10 and 4T1, without damaging the integrity of the normal cells BHK and CHO. DMT also demonstrated a marked activity against tumor cell strains B16F10 and 4T1.

Baicalein Inhibits the Migration and Invasion of B16F10 Mouse Melanoma Cells through Inactivation of the PI3K/Akt Signaling Pathway

Baicalein, a natural flavonoid obtained from the rhizome of Scutellaria baicalensis Georgi, has been reported to have anticancer activities in several human cancer cell lines. However, its antimetastatic effects and associated mechanisms in melanoma cells have not been extensively studied. The current study examined the effects of baicalein on cell motility and anti-invasive activity using mouse melanoma B16F10 cells. Within the noncytotoxic concentration range, baicalein significantly inhibited the cell motility and invasiveness of B16F10 cells in a concentration-dependent manner. Baicalein also reduced the activity and expression of matrix metalloproteinase (MMP)-2 and -9; however, the levels of tissue inhibitor of metalloproteinase-1 and -2 were concomitantly increased. The inhibitory effects of baicalein on cell motility and invasiveness were found to be associated with its tightening of tight junction (TJ), which was demonstrated by an increase in transepithelial electrical resistance and downregulation of the claudin family of proteins. Additionally, treatment with baicalein markedly reduced the expression levels of lipopolysaccharide-induced phosphorylated Akt and the invasive activity in B16F10 cells. Taken together, these results suggest that baicalein inhibits B16F10 melanoma cell migration and invasion by reducing the expression of MMPs and tightening TJ through the suppression of claudin expression, possibly in association with a suppression of the phosphoinositide 3-kinase/Akt signaling pathway.

In vivo antitumor potential of extracts from different parts of Bauhinia variegata linn. Against b16f10 melanoma tumour model in c57bl/6 mice

Background: Melanoma is a metastatic type of skin cancer that is difficult to treat and the majority of efforts are directed to the design of new drugs. Medicinal Plants have been the primary source of medicines since life on earth; more than 50% of existing cancer treatments is derived from plants. Bauhinia variegata is well-known medicinal plant used from the ancient era to till date for their medicinal values. Scientific literatures have not documented any evidence of the antitumour potential of Bauhinia variegata against B16F10 melanoma tumor model in C57BL mice. The present investigation was undertaken to explore the antitumour activity of Leaf, stem bark and flower extract of Bauhinia variegata against B16F10 melanoma tumour model in C57BL mice. Methods: Hydro-methanolic extract prepared from the leaf, stem bark and flower of Bauhinia variegata were assessed for their antitumor activity. The extracts at doses of 500 and 750 mg/kg b.wt. were given orally along with cyclophosphamide (chemotherapeutic drug) for 40 days for exploring antitumor activity against melanoma tumor (B16F10) in C57BL mice. Inhibition of tumor growth, increase in survival time of animal with treatment, histopathological studies and antioxidant parameter were determined. Results: The Present investigation showed significant effect of the B. variegata L. in preventing melanoma tumor by B16F10 cell line in C57BL/6 mice. As compared with the tumour control group, the remarkable results especially in the group which received B. variegata extract and cyclophosphamide together were obtained for all of the measured parameters. Dose dependent response was observed in tumor volume, inhibition rate, life span time and antioxidant parameter of extracts. Combination treatment of cyclophosphamide and B. variegata extracts showed more pronounced effect. Conclusions: These findings suggest that B. variegata hydromethanolic extract may contain bioactive compounds of potential therapeutic significance which are relatively safe from toxic effects, and can compromise the medicinal use of this plant in folk medicine (US)

Inhibition of Melanogenesis by Abietatriene from Vitex Trifolia Leaf Oil

Vitex trifolia L. has been used traditionally to treat various illnesses, such as inflammation, headache, migraine, and gastrointestinal infections. We analyzed and evaluated the composition of V. trifolia leaf oil. Based on the results, we isolated abietatriene from V. trifolia leaf oil and investigated the effect of V. trifolia leaf oil and its active compound abietatriene on melanogenesis in B16F10 melanoma cells. They significantly decreased melanin contents and melanogenic factors, such as tyrosinase, TRP-1, TRP-2, and MITF dose-dependently in both protein and mRNA levels. Protein and mRNA expressions were determined by Western blot analysis and quantitative real time RT-PCR. Findings indicate that V. trifolia leaf oil and abietatriene reduce melanogenesis by regulating the expression of melanogenic factors. These results suggest that V. trifolia leaf oil and abietatriene could comprise a useful therapeutic agent for treating hyperpigmentation and used as effective skin-whitening agents.

Study on the immunoregulatory and lethal effects of natural killer T cells on melanoma cells in vitro / 国际检验医学杂志

Objective To explore the immunoregulatory and lethal effects of natural killer T lymphocytes(NKTs) in vitro .Meth‐ods The mixed lymphocyte cultured(MLC) system was established ,in which the B16F10‐luc‐G5 cells were set as target cells ,the total lymphocyte cells were set as effector cells .(1)In the experiment on immunoregulatory effects ,NKT lymphocytes or CD4+CD25+ T lymphocytes were set as regulating cells ,there was three groups ,including the NKT group ,CD4+CD25+ T group and pure target cell control group .Otherewise ,the 1640 blank control group was set by only adding RPMI1640 solution .(2)In the ex‐periment on antitumor effects ,the NKT or natural killer(NK) lymphocytes were set as killer cells ,there was three groups ,inclu‐ding the NKT group ,NK group and pure target cell control group .Mixed culturing 24 ,48 and 72 hours ,the bioluminescence of target cells in MCL system was detected by using the in vivo imaging system .Results (1)In the experiment on immunoregulatory effects ,there were statistically significant differences in measured average photon numbers between NKT group ,CD4+ CD25+ T group and the two control groups(P<0 .05) .The statistically significant differences were also found in the NKT group between 24 hours and 72 hours (P<0 .05) .(2)In the experiment on antitumor effects ,there were statistically significant differences in meas‐ured average photon numbers ,when the NKT group and NK group were compared to the pure target cell control group(P<0 .05) . After culturing 24 and 72 hours ,statistically significant differences were found between NKT group and NK group(P<0 .05) .Con‐clusion The NKT cells could inhibit the lethal effects of lymphocyte cells on target cells ,and the inhibitory effects are changed by the length of culturing .Compared with the CD4+CD25+ T lymphocytes ,NKT lymphocytes have strongger regulatory effects .Addi‐tionally ,the NKT cells have lethal effects on target cells ,which might be weaker than that of NK cells .

Effect of bisdemethoxycurcumin on the proliferation and apoptosis of melanoma B16-F10 cells / 实用医学杂志

Objective To investigate the effect of bisdemethoxycurcumin on the proliferation and apoptosis of melanoma B16-F10 cells. Methods The B16-F10 cells were incubated with bisdemethoxycurcumin for 24 h, and MTT assay was used to detect the proliferation of B16-F10 cell. Flow cytometry was used to detect cell cycle and cell apoptosis. A C57BL/6 mouse melanoma model was established to investigate the effect of bisdemethoxycurcumin on the proliferation of melanoma. Expression of BCL-1 in B16-F10 cells and tissues was detected by western blotting assay. Results bisdemethoxycurcumin could significantly inhibit B16-F10 cell proliferation, induce B16-F10 cell apoptosis and block the cell cycle at S phase. The intravenous dosing of bisdemethoxycurcumin could inhibit the growth of melanoma. Bisdemethoxycurcumin could inhibit the expression of BCL-1. Conclusion Bisdemethoxycurcumin can inhibit the proliferation of B16-F10 cell, resulting from its role in promoting cell apoptosis.

Inhibitory effects of Licochalcone A on proliferation of melanoma B16 F10 cells / 中国药理学通报

Aim To investigate the mechanism of the melanoma B16 F10 cells proliferation induced by Lico-chalcone A in vitro. Methods The proliferation of B16 F10 cells induced by Licochalcone A was deter-mined by SRB method. The morphological changes were observed using Giemsa staining under the phase contrast microscope equipped with a digital camera. The melanin level was assessed by colorimetric meth-od. The apoptotic rate was determined by Annexin V-FITC/PI assay. Cell cycle distribution was determined by flow cytometry. The mRNA expression levels of B cell lymphoma/lewkmia-2 ( Bcl-2 ) , Bcl-2 associated X protein ( Bax) , the cell cycle protein CyclinE2 and cyclin-dependent kinase-2 ( CDK2 ) CDK2 were detec-ted using Q-PCR analysis. Results The proliferation of B16 F10 cells treated with Licochalcone A was effec-tively inhibited in a concentration and time-dependent manner. A clear morphological change was observed with the increasing concentration of Licochalcone A in B16F10 cells, the dendrite-like projections changed to the narrowing ball shape, which was associated with the increasing melanin level. The low concentration of Licochalcone A could induce B16F10 differentiation, and the high concentration of Licochalcone A could in-duce B16F10 apoptosis, which was accompanied with the increasing G1 phase in cell cycle. The mRNA ex-pression levels of Bcl-2 /Bax, CyclinE2 and CDK2 were markedly reduced. Conclusion Licochalcone A can effectively inhibit the proliferation of B16 F10 cells, induced cell cycle arrest at G1 phase, and fur-ther induced differentiation and apoptosis.

FTY720 induces apoptosis in B16F10-NEX2 murine melanoma cells, limits metastatic development in vivo, and modulates the immune system

OBJECTIVE: Available chemotherapy presents poor control over the development of metastatic melanoma. FTY720 is a compound already approved by the Food and Drug Administration for the treatment of patients with multiple sclerosis. It has also been observed that FTY720 inhibits tumor growth in vivo (experimental models) and in vitro (animal and human tumor cells). The aim of this study was to evaluate the effects of FTY720 on a metastatic melanoma model and in tumor cell lines. METHODS: We analyzed FTY720 efficacy in vivo in a syngeneic murine metastatic melanoma model, in which we injected tumor cells intravenously into C57BL/6 mice and then treated the mice orally with the compound for 7 days. We also treated mice and human tumor cell lines with FTY720 in vitro, and cell viability and death pathways were analyzed. RESULTS: FTY720 treatment limited metastatic melanoma growth in vivo and promoted a dose-dependent decrease in the viability of murine and human tumor cells in vitro. Melanoma cells treated with FTY720 exhibited characteristics of programmed cell death, reactive oxygen species generation, and increased β-catenin expression. In addition, FTY720 treatment resulted in an immunomodulatory effect in vivo by decreasing the percentage of Foxp3+ cells, without interfering with CD8+ T cells or lymphocyte-producing interferon-gamma. CONCLUSION: Further studies are needed using FTY720 as a monotherapy or in combined therapy, as different types of cancer cells would require a variety of signaling pathways to be extinguished. .

Differential Proteomic Analysis of Metastasis-associated Proteins in Mice Melanoma / 中国肿瘤临床

Objective: To investigate differentially expressed protein profiles in B16-F10 grafted melanoma and its metastasis in the lung in order to identify molecular markers of melanoma metastasis. Methods: Differentially expressed proteins in B16-F10 grafted melanoma and its metastatic lesion in the lung were isolated and identified by fluorescence two-dimensional differential gel electrophoresis(2D-DIGE)coupled with matrix assisted laser desorption ionisation time-of-flight mass spectrometry(MALDI-TOF-MS).Some of identified proteins were further confirmed by Real-time PCR analysis. Results: High resolutional images of differential gel electrophoresis were obtained and 9 of 30 differentially expressed proteins (IRatiol≥2,P<0.01)were identified by MALDI-TOF-MS.The expression of Myoglobin(MB),vimentin(VIM),phosphoglycerate kinase 1(PGK1),Triosephosphate isomerase(TPI or TIM),heavy-chain binding protein(BiP),α-enolase,β-actin,γ-actin,and laminin-binding protein were up-regulated in the experimental group compared with the control group.These proteins were involved in the cytoskeletal formation,glycolysis and so on.Real-time PCR analysis showed up-regulation of mRNA expression of PGK1 and TPI in the experimental group(P=0.001 and 0.003),which was in consistent with the resuits of proteomic analysis. Conclusion: A variety of abnormally expressed proteins contribute to the metastasis of mice melanoma.Glycolytic enzymes PGK1 and TPI may be involved in this process.