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Knockdown of circ_0084043 suppresses the development of human melanoma cells through miR-429/tribbles homolog 2 axis and Wnt/β-catenin pathway.

敲除circ_0084043 通过miR-4 2 9/tribbles同源物 2 轴和Wnt/β-catenin通路抑制人黑色素瘤细胞的发育。

  • 影响因子:3.40
  • DOI:10.1016/j.lfs.2020.117323
  • 作者列表:"Chen Z","Chen J","Wa Q","He M","Wang X","Zhou J","Cen Y
  • 发表时间:2020-02-15

AIMS:Circular RNAs (circRNAs) have been emerged as novel regulators in multiple tumorigenesis, including melanoma. CircRNA_0084043 was recently demonstrated to be deregulated in human melanoma cells. Nevertheless, its role and mechanism are largely unrevealed in melanoma. MATERIALS AND METHODS:Expression of circ_0084043, miRNA (miR)-429 and tribbles homolog 2 (TRIB2) was detected using reverse transcription-quantitative PCR quantitative PCR (RT-qPCR) and western blotting. Cell proliferation, apoptosis, migration and invasion were measured by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay, flow cytometry and transwell assays, respectively. The activation of Wnt/β-catenin pathway was evaluated by western blotting. The target binding among circ_0084043, miR-429 and TRIB2 was confirmed by dual-luciferase reporter assay and RNA immunoprecipitation. In vivo, mice xenograft model was generated to investigate tumor growth. KEY FINDINGS:Expression of circ_0084043 and TRIB2 was upregulated in human melanoma tissues and cell lines. Both circ_0084043 knockdown and TRIB2 silencing could decrease cell proliferation, migration and invasion, but facilitate apoptosis in A375 and SK-MEL-28 cells. Furthermore, TRIB2 restoration partially abrogated the tumor-suppressive role of circ_0084043 knockdown in melanoma cells in vitro. Then, we verified that circ_0084043 positively and physically controlled TRIB2 expression through sponging miR-429. Besides, expression of β-catenin, c-Myc and cyclinD1 was inhibited in A375 and SK-MEL-28 cells when circ_0084043 was knocked down, accompanied with increased miR-429 and decreased TRIB2. Notably, circ_0084043 downregulation impeded tumor growth of A375 cells in vivo. SIGNIFICANCE:Knockdown of circ_0084043 suppressed the malignant development of melanoma presumably through modulating miR429/TRIB2 axis and inactivating Wnt/β-catenin signaling pathway.


目的: 环状rna (Circular RNAs,circRNAs) 已经成为多种肿瘤发生的新型调控因子,包括黑色素瘤。CircRNA_0084043 最近被证明在人黑色素瘤细胞中失调。然而,其在黑色素瘤中的作用和机制在很大程度上尚未揭示。 材料和方法: 采用逆转录-定量PCR (RT-qPCR) 和western blotting检测circ_0084043 、miRNA (miR)-429 和tribbles同源物 2 (TRIB2) 的表达。分别用 3-(4,5-二甲基噻唑-2-基)-2,5-二苯基四氮唑溴盐 (MTT) 法、流式细胞术和transwell法测定细胞增殖、凋亡、迁移和侵袭。Western blotting评价Wnt/β-catenin通路的激活。通过双荧光素酶报告基因检测和RNA免疫沉淀证实了circ_0084043 、miR-429 和TRIB2 之间的靶结合。在体内,生成小鼠异种移植模型来研究肿瘤生长。 关键发现: circ_0084043 和TRIB2 在人黑色素瘤组织和细胞系中表达上调。Circ_0084043 敲除和TRIB2 沉默均可降低A375 和SK-MEL-28 细胞的增殖、迁移和侵袭能力,但可促进细胞凋亡。此外,TRIB2 恢复部分消除了circ_0084043 敲除在体外黑色素瘤细胞中的肿瘤抑制作用。然后,我们验证了circ_0084043 通过海绵miR-429 积极和物理控制TRIB2 的表达。此外,当circ_0084043 被敲低时,A375 和SK-MEL-28 细胞 β-catenin、c-Myc和cyclinD1 的表达受到抑制,伴随着miR-429 的增加和trip2 的降低。值得注意的是,circ_0084043 下调在体内阻碍了A375 细胞的肿瘤生长。 意义: 敲除circ_0084043 可通过调节miR429/TRIB2 轴和灭活Wnt/β-catenin信号通路抑制黑色素瘤的恶性发展。



作者列表:["Zhang B","Li L","Zhang N","Zhao M","Liu Y","Wei L","Ma L","Xu Z"]

METHODS::Blue rubber bleb naevus syndrome (BRBNS) is an extremely rare venous malformation that often manifests as multiple haemangioma-like lesions in the skin and gastrointestinal tract. The drug sirolimus plays a key role in the signalling pathway of angiogenesis and subsequent development of BRBNS and its use has been described in several case reports. We present a case series of four patients with BRBNS who exhibited good treatment response to sirolimus. All four patients were administered oral sirolimus at doses of 1.0-1.5 mg/m2 /day with a target drug level of 5-10 ng/mL and median treatment duration of 20 months. All patients had a reduction in the size of the lesions and a normalization of coagulopathy with tolerable drug adverse reactions at follow-up. Sirolimus may be effective and safe in paediatric patients with BRBNS. Further prospective studies are suggested to evaluate the long-term effectiveness of this drug.

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作者列表:["Pham CT","Juhasz M","Sung CT","Mesinkovska NA"]

METHODS:BACKGROUND:Human papillomavirus (HPV) infections are associated with common dermatologic and nondermatologic diseases. Although HPV vaccines are well established as preventive measures for genital warts and cervical neoplasia, their use as therapeutic agents deserves greater attention. OBJECTIVE:To evaluate the use of HPV vaccine(s) as a treatment modality for cutaneous and/or mucosal disease. METHODS:A primary literature search using the Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines was conducted in January 2019 by using the PubMed and Cochrane databases. RESULTS:A total of 63 articles with 4439 patients were included. The majority of patients with cutaneous warts, recurrent respiratory papillomatosis, and squamous and basal cell carcinomas were successfully treated with HPV vaccination. Preliminary data on patients with pre-existing anogenital warts, cervical intraepithelial neoplasia, anal intraepithelial neoplasia, and vulvar intraepithelial neoplasia is promising. LIMITATIONS:This review was limited by the lack of controls, patients' previous HPV vaccination status, and publication bias. CONCLUSION:The commercially available three-dose, quadrivalent HPV vaccine is a potential therapeutic option for the treatment of cutaneous warts, recurrent respiratory papillomatosis, and squamous and basal cell carcinomas. Noncommercially available HPV vaccines demonstrate therapeutic response for treating anogenital warts, cervical intraepithelial neoplasia, anal intraepithelial neoplasia, and vulvar intraepithelial neoplasia. The vaccine's efficacy as an adjunct therapy for HPV-associated cutaneous and/or mucosal disease warrants further exploration.

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作者列表:["Lang UE","Love NR","Cheung C","McCalmont TH","Kim J"]

METHODS::Our understanding of melanoma precursors and progression to melanoma has developed as a result of advances in the field of molecular diagnostics. We now better understand the potential for genetic heterogeneity within a single lesion. Combined tumors can pose a diagnostic challenge when deciding the line between benign and malignant, which in turn has direct implications for patient management. Primary cilia (PC) are ubiquitous sensory organelles that have essential functions in cellular proliferation, differentiation, and development. The ciliation index (percentage of ciliated melanocytes) has been shown to reliably differentiate melanoma, which fail to ciliate, from melanocytic nevi, which retain PC. We therefore analyzed the potential for using the ciliation index to differentiate benign and malignant components in combined melanocytic lesions. We collected patient samples (n = 10) of unequivocal combined lesions with both melanoma and associated nevus components. Melanocytes were highlighted with SOX10 and costained with gamma-Tubulin and acetylated alpha-Tubulin to highlight the basal body and cilium, respectively. The number of melanocytes retaining cilia under high-power microscopy was examined. The melanoma component had average of 4% ciliation (SD: 7%), whereas the associated nevus component was significantly higher with 59% ciliation (SD: 17%). These data show that PC may be a reliable means of distinguishing benign from malignant components within a single tumor. The ciliation index may be a helpful tool in distinguishing challenging cases of combined lesions of melanoma in situ with a dermal nevus component from invasive melanoma, thus promoting improved staging and clinical management.

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