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1.
Noguchi S Mori T Otsuka Y Yamada N Yasui Y Iwasaki J Kumazaki M Maruo K Akao Y 《The Journal of biological chemistry》2012,287(15):11769-11777
MicroRNAs regulate gene expression by repressing translation or directing sequence-specific degradation of their complementary mRNA. We recently reported that miR-203 is down-regulated, and its exogenous expression inhibits cell growth in canine oral malignant melanoma tissue specimens as well as in canine and human malignant melanoma cells. A microRNA target database predicted E2F3 and ZBP-89 as putative targets of microRNA-203 (miR-203). The expression levels of E2F3a, E2F3b, and ZBP-89 were markedly up-regulated in human malignant melanoma Mewo cells compared with those in human epidermal melanocytes. miR-203 significantly suppressed the luciferase activity of reporter plasmids containing the 3'-UTR sequence of either E2F3 or ZBP-89 complementary to miR-203. The ectopic expression of miR-203 in melanoma cells reduced the levels of E2F3a, E2F3b, and ZBP-89 protein expression. At the same time, miR-203 induced cell cycle arrest and senescence phenotypes, such as elevated expression of hypophosphorylated retinoblastoma and other markers for senescence. Silencing of E2F3, but not of ZBP-89, inhibited cell growth and induced cell cycle arrest and senescence. These results demonstrate a novel role for miR-203 as a tumor suppressor acting by inducing senescence in melanoma cells. 相似文献
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miRNA-205 suppresses melanoma cell proliferation and induces senescence via regulation of E2F1 protein 总被引:1,自引:0,他引:1
Dar AA Majid S de Semir D Nosrati M Bezrookove V Kashani-Sabet M 《The Journal of biological chemistry》2011,286(19):16606-16614
MicroRNAs (miRNAs) regulate gene expression by repressing translation or directing sequence-specific degradation of complementary mRNA. Here, we report that expression of miR-205 is significantly suppressed in melanoma specimens when compared with nevi and is correlated inversely with melanoma progression. miRNA target databases predicted E2F1 and E2F5 as putative targets. The expression levels of E2F1 and E2F5 were correlated inversely with that of miR-205 in melanoma cell lines. miR-205 significantly suppressed the luciferase activity of reporter plasmids containing the 3'-UTR sequences complementary to either E2F1 or E2F5. Overexpression of miR-205 in melanoma cells reduced E2F1 and E2F5 protein levels. The proliferative capacity of melanoma cells was suppressed by miR-205 and mediated by E2F-regulated AKT phosphorylation. miR-205 overexpression resulted in induction of apoptosis, as evidenced by increased cleaved caspase-3, poly-(ADP-ribose) polymerase, and cytochrome c release. Stable overexpression of miR-205 suppressed melanoma cell proliferation, colony formation, and tumor cell growth in vivo and induced a senescence phenotype accompanied by elevated expression of p16INK4A and other markers for senescence. E2F1 overexpression in miR-205-expressing cells partially reversed the effects on melanoma cell growth and senescence. These results demonstrate a novel role for miR-205 as a tumor suppressor in melanoma. 相似文献
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In the present study, potential anticancer effect of eugenol on inhibition of cell proliferation and induction of apoptosis in human MCF-7 breast cancer cells was investigated. Induction of cell death by eugenol was evaluated following MTT assay and monitoring lactate dehydrogenase released into the culture medium for cell viability and cytotoxicity, giemsa staining for morphological alterations, fluorescence microscopy analysis of cells using ethidium bromide and acridine orange and quantitation of DNA fragments for induction of apoptosis. Effect of eugenol on intracellular redox status of the human breast cancer cells was assessed by determining the level of glutathione and lipid peroxidation products (TBARS). Eugenol treatment inhibited the growth and proliferation of human MCF-7 breast cancer cells through induction of cell death, which was dose and time dependent. Microscopic examination of eugenol treated cells showed cell shrinkage, membrane blebbing and apoptotic body formation. Further, eugenol treatment also depleted the level of intracellular glutathione and increased the level of lipid peroxidation. The dose dependent increase in the percentage of apoptotic cells and DNA fragments suggested that apoptosis was involved in eugenol induced cell death and apoptosis might have played a role in the chemopreventive action of eugenol. 相似文献
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黑素瘤是一种多发于皮肤的恶性肿瘤,因其侵袭性强,预后差等特点一直是科研人员关注的热点。环状RNAs(circRNAs)是一种新型内源性非编码RNA,广泛参与动物生长发育、细胞分化和信号转导等生理过程,但circRNAs在黑素瘤细胞内的分子机制尚未被充分解析。本研究以小鼠(C57BL/6J)正常黑素细胞及B16黑素瘤细胞为研究对象,采用二代测序技术分析两种细胞间circRNAs表达特性。测序结果显示,小鼠正常黑素细胞和黑素瘤细胞中共有851个circRNAs,其中195个差异表达circRNAs(DECs)。GO及KEGG数据库注释发现,DECs的来源基因主要参与细胞周期(cell cycle)、紧密结合(tight junction)、Rap1信号通路(Rap1 signaling pathway)、TGF-beta信号通路(TGF-beta signaling pathway)等与细胞增殖、迁移相关的信号通路;探究发现,黑素瘤细胞中显著性高表达的circE2F5(circ-3:14578602|14606309)通过上调E2F5的表达促进黑素瘤细胞增殖。circRNA靶基因预测发现,... 相似文献
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Silke Kuphal Adam C. Martyn Julie Pedley Lisa M. Crowther Vanessa F. Bonazzi Peter G. Parsons Anja K. Bosserhoff Nicholas K. Hayward Glen M. Boyle 《Pigment cell & melanoma research》2009,22(3):296-306
Melanocytic behavior, survival, and proliferation are regulated through a complex system of cell–cell adhesion molecules. Pathologic changes leading to development of malignant melanoma, upset the delicate homeostatic balance between melanocytes and keratinocytes and can lead to altered expression of cell–cell adhesion and cell–cell communication molecules. Malignant transformation of melanocytes frequently coincides with loss of E‐cadherin expression. We now show loss of another member of the superfamily of classical cadherins, H‐cadherin (CDH13), which may be involved in the development of malignant melanoma. The provided data show that H‐cadherin expression is lost in nearly 80% of the analyzed melanoma cell lines. Knockdown of H‐cadherin using siRNA increases invasive capacity in melanocytes. Functional assays show that the re‐expression of H‐cadherin decreases migration and invasion capacity, as well as anchorage‐independent growth in comparison to control melanoma cells. Furthermore, melanoma cells, which re‐express H‐cadherin via stable transfection show a reduction in rate of tumor growth in a nu/nu mouse tumor model in comparison to the parental control transfected cell lines. Our study presents for the first time the down‐regulation of H‐cadherin in malignant melanomas and its possible functional relevance in maintenance healthy skin architecture. 相似文献
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Ying Xia Yu Zhou Han Han Peng Li Wei Wei Nengxing Lin 《Journal of cellular physiology》2019,234(11):19592-19601
Melanoma contributes a lot to skin cancer-related deaths. lncRNAs are implicated in various diseases, including melanoma. lncRNA NEAT1 is frequently dysregulated and can play important roles in multiple cancers. Nevertheless, little has been studied about the function of NEAT1 in melanoma progression. In our present research, we displayed NEAT1 was overexpressed in melanoma cells. A series of functional assays showed that overexpression of NEAT1 promoted the proliferation, migration, and invasion of melanoma cells. By contrast, NEAT1 knockdown obviously restrained melanoma cell progression. Mechanistically, it was revealed that NEAT1 could directly bind with miR-495-3p, which led to a negative effect on miR-495-3p levels. In addition, miR-495-3p was significantly decreased in melanoma cells. Furthermore, E2F3 was postulated as the target of miR-495-3p and overexpression of this miR could suppress the levels of E2F3. Meanwhile, it was exhibited that melanoma cell proliferation, migration, and invasion induced by E2F3 silence was abrogated by miR-495-3p. Moreover, an in vivo xenograft nude mice model was established using A375 cells and it was indicated that NEAT1 promoted melanoma progression in vivo via regulating the miR-495-3p/E2F3 axis. In conclusion, we suggest that NEAT1 exerts an oncogenic effect on melanoma development via inhibition of miR-495-3p and induction of E2F3. NEAT1 might serve as a crucial prognostic biomarker of melanoma. 相似文献
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目的:通过检测环状RNA Circ_0001073在恶性黑素瘤细胞与正常表皮黑素细胞中的表达差异,及其对恶性黑素瘤A375细胞恶性表型的影响,阐明Circ_001073在恶性黑素瘤细胞中的表达及功能。方法:采用聚合酶链式反应(Real-time quantitative polymerase chain reaction, RT-QPCR)方法检测正常表皮黑素细胞和恶性黑素瘤细胞中Circ_0001073的表达水平;应用小干扰RNAs沉默恶性黑素瘤A375细胞中Circ_0001073表达,5-乙炔基-2'-脱氧尿苷(5-Ethynyl-2'-deoxyuridine,EdU)实验检测沉默Circ_0001073对A375细胞增殖的影响,平板克隆实验检测沉默Circ_0001073对A375细胞克隆形成的影响,细胞划痕实验评估沉默Circ_0001073对A375细胞迁移能力的影响,Transwell实验评估沉默Circ_0001073对A375细胞侵袭能力的影响。结果:qRT-PCR结果显示Circ_0001073在恶性黑素瘤细胞中的表达低于正常表皮黑素HEMa-LP细胞(P0.05)。应用Circ_0001073si RNA转染A375细胞后,Circ_0001073的表达水平较转染Circ_0001073 NC的细胞显著降低(P0.05)。EdU实验结果显示:沉默A375细胞中Circ_0001073的表达后,A375细胞增殖能力显著增强(P0.05);平板克隆实验结果显示:沉默A375细胞中Circ_0001073的表达后,A375细胞克隆形成能力显著增强(P0.05);细胞划痕实验结果显示:沉默A375细胞中Circ_0001073的表达后,细胞迁移能力显著增强(P0.05);Transwell实验结果显示:沉默A375细胞中Circ_0001073的表达后,细胞侵袭能力显著增强(P0.05)。结论:Circ_0001073在恶性黑素瘤细胞中低表达,并可抑制A375细胞的增殖、克隆形成、迁移及侵袭。 相似文献
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Although melanoma is the most aggressive skin cancer, recent advances in BRAF and/or MEK inhibitors against BRAF-mutated melanoma have improved survival rates. Despite these advances, a treatment strategy targeting NRAS-mutated melanoma has not yet been elucidated. We discovered CH5126766/RO5126766 as a potent and selective dual RAF/MEK inhibitor currently under early clinical trials. We examined the activity of CH5126766/RO5126766 in a panel of malignant tumor cell lines including melanoma with a BRAF or NRAS mutation. Eight cell lines including melanoma were assessed for their sensitivity to the BRAF, MEK, or RAF/MEK inhibitor using in vitro growth assays. CH5126766/RO5126766 induced G1 cell cycle arrest in two melanoma cell lines with the BRAF V600E or NRAS mutation. In these cells, the G1 cell cycle arrest was accompanied by up-regulation of the cyclin-dependent kinase inhibitor p27 and down-regulation of cyclinD1. CH5126766/RO5126766 was more effective at reducing colony formation than a MEK inhibitor in NRAS- or KRAS-mutated cells. In the RAS-mutated cells, CH5126766/RO5126766 suppressed the MEK reactivation caused by a MEK inhibitor. In addition, CH5126766/RO5126766 suppressed the tumor growth in SK-MEL-2 xenograft model. The present study indicates that CH5126766/RO5126766 is an attractive RAF/MEK inhibitor in RAS-mutated malignant tumor cells including melanoma. 相似文献
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Hahm E Jin DH Kang JS Kim YI Hong SW Lee SK Kim HN Jung da J Kim JE Shin DH Hwang YI Kim YS Hur DY Yang Y Cho D Lee MS Lee WJ 《Journal of cellular biochemistry》2007,102(4):1002-1010
Vitamin C has inconsistent effects on malignant tumor cells, which vary from growth stimulation to apoptosis induction. It is well known that melanoma cells are more susceptible to vitamin C than any other tumor cells, but the precise mechanism remains to be elucidated. In the present study, the proliferation of B16F10 melanoma cells was suppressed by vitamin C, which induced growth arrest in a dose-dependent manner without cytotoxic effects. Therefore, we investigated the changes in cell cycle distribution of B16F10 melanoma cells by staining DNAs with propidium iodide (PI). The growth inhibition of B16F10 melanoma by vitamin C was associated with an arrest of cell cycle distribution at G1 stage. In addition, the levels of p53-p21Waf1/Cip1 increased during G1 arrest, which were essential for vitamin C-induced cell cycle arrest. The increased p21Waf1/Cip1 inhibited CDK2. Moreover, the activity of p53-p21Waf1/Cip1 pathway was closely related with the activation of checkpoint kinase 2 (Chk2). Inhibitor of the PI3K-family, LY294002 and the ATM/ATR inhibitor, caffeine, blocked vitamin C-induced growth arrest in B16F10 melanoma cells. These results suggest that vitamin C might be a potent agent to inhibit proliferative activity of melanoma cells via the regulation of Chk2-p53-p21Waf1/Cip1 pathway. 相似文献
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Han-En Tsai Jian-Ching Wu Mei-Lang Kung Li-Feng Liu Lai-Hsin Kuo Hsiao-Mei Kuo San-Cher Chen Elsa C. Chan Chieh-Shan Wu Ming-Hong Tai Guei-Sheung Liu 《PloS one》2013,8(3)
Cutaneous malignant melanoma is the fastest increasing malignancy in humans. Hepatoma-derived growth factor (HDGF) is a novel growth factor identified from human hepatoma cell line. HDGF overexpression is correlated with poor prognosis in various types of cancer including melanoma. However, the underlying mechanism of HDGF overexpression in developing melanoma remains unclear. In this study, human melanoma cell lines (A375, A2058, MEL-RM and MM200) showed higher levels of HDGF gene expression, whereas human epidermal melanocytes (HEMn) expressed less. Exogenous application of HDGF stimulated colony formation and invasion of human melanoma cells. Moreover, HDGF overexpression stimulated the degree of invasion and colony formation of B16–F10 melanoma cells whereas HDGF knockdown exerted opposite effects in vitro. To evaluate the effects of HDGF on tumour growth and metastasis in vivo, syngeneic mouse melanoma and metastatic melanoma models were performed by manipulating the gene expression of HDGF in melanoma cells. It was found that mice injected with HDGF-overexpressing melanoma cells had greater tumour growth and higher metastatic capability. In contrast, mice implanted with HDGF-depleted melanoma cells exhibited reduced tumor burden and lung metastasis. Histological analysis of excised tumors revealed higher degree of cell proliferation and neovascularization in HDGF-overexpressing melanoma. The present study provides evidence that HDGF promotes tumor progression of melanoma and targeting HDGF may constitute a novel strategy for the treatment of melanoma. 相似文献
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Pardo M Piñeiro A de la Fuente M García A Prabhakar S Zitzmann N Dwek RA Sánchez-Salorio M Domínguez F Capeans C 《Journal of cellular biochemistry》2004,93(4):708-720
Uveal malignant melanoma is the most frequent primary intraocular tumor in adult humans. The cellular events leading to neoplasic transformation of normal uveal melanocytes are not well known when compared to other cancers. In this study, we investigated the role of G1 and G1/S regulatory proteins of the cell cycle in human uveal melanoma (UM) primary cell cultures, since these proteins are common targets in tumor development. Further, freshly established and characterized tumor cells are a better model for in vitro studies when compared to cell lines established long ago. Human primary cell cultures from eight different UM were established, as well as one primary culture from rhesus uveal normal melanocytes (UNM). Primary human UM cultures were characterized by a low establishment and growing rate. From four successful cultures, three showed a high expression of cyclin D1, cyclin E, p16NK4A, and p27KIP1 with no variations in cyclin A, cyclin-dependent kinase 2 (CDK2), and CDK4. Interestingly, in one of the cultured tumors, tumor suppressor protein retinoblastoma (Rb) did not bind E2F despite the fact that Rb was found in its hypophosphorylated form. No mutations in either RB1 or the Rb-binding pocket of E2F-1 were detected. Furthermore, we identified seven proteins co-immunoprecipitating with Rb in this tumor, including Lamin A/C and six proteins not previously reported to bind Rb: Hsc70, high mobility group protein 1 (HMG-1), hnRPN, glyceraldehyde 3 phosphate dehydrogenase (G3PDH), EF-1, and EF-2. Our results indicate that the overexpression of cyclins D1/E and CDKIs p16 and p27, together with a deregulation of the Rb/E2F pathway, may be implicated in the development of human UM. 相似文献
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Inducible cyclooxygenase (COX-2) has been implicated in the processes of inflammation and carcinogenesis. Thus, the potential COX-2 inhibitors have been considered as anti-inflammatory or cancer chemopreventive agents. In this study, the methanolic extract of the cortex of Eugenia caryophyllata Thunberg (Myrtaceae) was found to potently inhibit the prostaglandin E(2) production in lipopolysaccharide (LPS)-activated mouse macrophage RAW264.7 cells (98.3% inhibition at the test concentration of 10 microg/ml). Further, hexane-soluble layer was the most active partition compared to ethyl acetate, n-butanol, and water-soluble parts. By bioassay-guided fractionation of hexane-soluble partition, eugenol was isolated and exhibited a significant inhibition of PGE(2) production (IC(50) = 0.37 microM). In addition, eugenol suppressed the cyclooxygenase-2 (COX-2) gene expression in LPS-stimulated mouse macrophage cells. On the line of COX-2 playing an important role in colon carcinogenesis further study was designed to investigate the effect of eugenol on the growth and COX-2 expression in HT-29 human colon cancer cells. Eugenol inhibited the proliferation of HT-29 cells and the mRNA expression of COX-2, but not COX-1. This result suggests that eugenol might be a plausible lead candidate for further developing the COX-2 inhibitor as an anti-inflammatory or cancer chemopreventive agent. 相似文献
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TIMP-1-GPI in combination with hyperthermic treatment of melanoma increases sensitivity to FAS-mediated apoptosis 总被引:1,自引:0,他引:1
Djafarzadeh R Milani V Rieth N von Luettichau I Skrablin PS Hofstetter M Noessner E Nelson PJ 《Cancer immunology, immunotherapy : CII》2009,58(3):361-371
Resistance to apoptosis is a prominent feature of malignant melanoma. Hyperthermic therapy can be an effective adjuvant treatment
for some tumors including melanoma. We developed a fusion protein based on the tissue inhibitor of matrix metalloproteinase-1
linked to a glycosylphosphatidylinositol anchor (TIMP-1-GPI). The TIMP-1-GPI-fusion protein shows unique properties. Exogenous
administration of TIMP-1-GPI can result in transient morphological changes to treated cells including modulation of proliferation
and decreased resistance to apoptosis. The effect of TIMP-1-GPI on the biology of melanoma in the context of a defined hyperthermic
dose was evaluated in vitro. Clonogenic assays were used to measure cell survival. Gelatinase zymography determined secretion
of MMP-2 and MMP-9. Monoclonal antibody against FAS/CD95 was applied to induce apoptosis. The expression of pro- and anti-apoptotic
proteins and the secretion of immunoregulatory cytokines were then evaluated using Western blot and ELISA. TIMP-1-GPI combined
with a sub-lethal hyperthermic treatment (41.8°C for 2 h) suppressed tumor cell growth capacity as measured by clonogenic
assay. The co-treatment also significantly suppressed tumor cell proliferation, enhanced FAS receptor surface expression increased
tumor cell susceptibility to FAS-mediated killing. The increased sensitivity to FAS-induced apoptosis was linked to alterations
in the apoptotic mediators Bcl-2, Bax, Bcl-XL and Apaf-1. The agent works in concert with sub-lethal hyperthermic treatment
to render melanoma cells sensitive to FAS killing. The targeted delivery of TIMP-1-GPI to tumor environments in the context
of regional hyperthermic therapy could be optimized through the use of thermosensitive liposomes.
Elfriede Noessner, Peter J. Nelson are equal contributors. 相似文献
17.
Kenessey I 《Magyar onkologia》2011,55(1):55-58
The components of the extracellular matrix (ECM) are more than just adhesion sites for migrating tumor cells: following enzymatic degradation of the ECM, the release of sequestrated growth factors increases, thus they become available for tumor cells. In a number of cancers dysfunction of epidermal growth factor receptor (EGFR) or hepatocyte growth factor receptor (c-Met) contribute to the malignant transformation that directly regulates cell proliferation, survival and motility. Furthermore, intracellular calcium level plays an important role in the regulation of the tyrosine kinase pathway. In our preclinical experiments, by administering heparin-derived oligosaccharides we influenced the interaction between human melanoma cells and ECM. In vitro cell migration was inhibited by heparin fragments. Moreover, two of the effective oligosaccharides reduced the number of lung colonies formed in SCID mice. In human melanoma cells an important element of Ca2+ homeostasis, the purinergic Ca2+ channel P2X7 proved to be an anti-apoptotic protein. EGFR and c-Met showed constitutive activity in human melanoma cells, and their inhibition in vitro caused decreased proliferation, migration and elevated apoptosis. Administration of a selective c-Met-TKI significantly decreased primary tumor growth in vivo as well as the capacity for liver colony formation in SCID mice. Selective EGFR-TKI had less inhibitory effect on metastasis formation, and had no effect on the primary tumor. Our results suggest the necessity of a rational dual-specific drug design for the purpose in the therapy of malignant melanoma. 相似文献
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E. I. Yurlova K. A. Rubina V. Yu. Sysoeva G. V. Sharonov E. V. Semina E. V. Parfenova V. A. Tkachuk 《Russian Journal of Developmental Biology》2010,41(4):217-226
The influence of T-cadherin on the pigmentation and proliferation of mouse melanoma B16F10 cells in vitro and on the growth
and neovascularization of tumor cell masses formed by the B16F10 cells in a model of the chorioallantoic membrane of a chicken
embryo is studied. It is found that the proliferative activity of the cells decreases in the cell culture of mouse melanoma
upon the overexpression of T-cadherin in comparison with the cells in the control. It is shown in experiments in vitro that
the B16F10 cells with the overexpression of T-cadherin are rarely settling are to the chorioallantoic membrane than the control
cells. In addition, it is found that the control cells of mouse melanoma form tumors with area more 0.1 mm2 more often than the cells with the overexpression of T-cadherin and the amount of the vessels growing to tumor cell masses
formed by the cells with the overexpression of T-cadherin is significantly lower than the same index for the cells in the
control. Thus, the overexpression of T-cadherin in the B16F10 cells suppresses the proliferation of these cells in vitro and
the growth of the tumor masses formed by melanoma cells on the chorioallantoic membrane and their neovascularization in vivo. 相似文献
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Jie Wen Wenqian Chen Baoxiang Zhao Qiuping Xu Chang Liu Qun Zhang Zhiwei Xie Yonggan Yan Jing Guo Jun Huang Junying Miao Xunwei Wu 《Cell death & disease》2021,12(6)
p53, the major tumor suppressor, is frequently mutated in many cancers, and up to 84% of human melanomas harbor wild-type p53, which is considered to be an ideal target for melanoma therapy. Here, we evaluated the antitumor activity of a carbazole derivative, 9-ethyl-9H-carbazole-3-carbaldehyde (ECCA), on melanoma cells. ECCA had a selectively strong inhibitory activity against the growth of BRAF-mutated and BRAF-wild-type melanoma cells but had little effect on normal human primary melanocytes. ECCA inhibited melanoma cell growth by increasing cell apoptosis, which was associated with the upregulation of caspase activities and was significantly abrogated by the addition of a caspase inhibitor. In vivo assays confirmed that ECCA suppressed melanoma growth by enhancing cell apoptosis and reducing cell proliferation, and importantly ECCA did not have any evident toxic effects on normal tissues. RNA-Seq analysis identified several pathways related to cell apoptosis that were affected by ECCA, notably, activation of the p53 signaling pathway. Biochemical assays demonstrated that ECCA enhanced the phosphorylation of p53 at Ser15 in melanoma cells harboring wild-type p53, and importantly, the knockdown or deletion of p53 in those cells counteracted the ECCA-induced apoptosis, as well as senescence. Further investigations revealed that ECCA enhanced the phosphorylation of p38-MAPK and c-Jun N-terminal kinase (JNK), and treatment with either a p38-MAPK or a JNK inhibitor rescued the cell growth inhibition elicited by ECCA, which depended on the expression of the p53 gene. Finally, the combination of ECCA with a BRAF inhibitor significantly enhanced the growth inhibition of melanoma cells. In summary, our study demonstrates that the carbazole derivative, ECCA, induces melanoma cell apoptosis and senescence through the activation of p53 to significantly and selectively suppress the growth of melanoma cells without affecting normal human melanocytes, suggesting its potential to develop a new drug for melanoma therapy.Subject terms: Melanoma, Apoptosis, Biologics 相似文献