Abstract:
BACKGROUND:Metastasis is the primary cause of death in renal cell carcinoma (RCC). Loss of cell-to-cell adhesion, including tight junctions (TJs) is the initial step in the process of metastasis. Claudin-7 (CLDN7) is a major component of TJs. However, the clinical significance and its regulation of kidney tumorigenesis remain poorly understood. METHODS:A total of 120 fresh clear cell RCC (ccRCC) specimens and 144 primary RCC and adjacent nonmalignant renal paraffin specimens were obtained from Department of Urology, Peking University First Hospital. Expression of CLDN7 in ccRCC tissues and cell lines were determined using bioinformatic data mining, quantitative real-time PCR (qRT-PCR), Western blotting and immunostaining. The clinical significance of CLDN7 expression and promoter DNA methylation status was analyzed in ccRCC patients from Peking University First Hospital and The Cancer Genome Atlas. Additionally, the methylation specific-PCR, bisulfite genomic sequencing and demethylation analysis of CLDN7 were performed. Biological functions of CLDN7 were investigated by examining cell proliferation using MTS assays and EdU incorporation assays, cell migration by in vitro wound healing assays and transwell migration assays, cell invasion by transwell invasion assays, and cell apoptosis by flow cytometry. Mouse model experiments were performed to confirm the effects of CLDN7 on tumor growth and metastasis in vivo. The molecular mechanism of CLDN7 function was investigated using gene-set enrichment analysis (GSEA) and high-throughput cDNA sequencing (RNA-Seq) and confirmed by qRT-PCR, Western blot and immunostaining in vitro and in vivo. RESULTS:Our findings revealed that CLDN7 is frequently downregulated via hypermethylation of its promoter in ccRCC. CLDN7 can help predict aggressive tumor status and poor prognosis in ccRCC patients. Interestingly, hypermethylation of the CLDN7 promoter was related to advanced ccRCC status and poor prognosis. Moreover, overexpression of CLDN7 induced cell apoptosis, suppressed proliferation, migration and invasion abilities of ccRCC cells both in vitro and in vivo. Additionally, GSEA and RNA-Seq results showed that CLDN7 had negative effects in cancer-associated signaling pathways and (epithelial-mesenchymal transition) EMT-related pathways. These results were validated by qRT-PCR, Western blot and immunostaining. CONCLUSIONS:We have demonstrated a previously undescribed role of CLDN7 as a ccRCC suppressor and suggest that loss of CLDN7 potentiates EMT and tumor progression. CLDN7 may serve as a functional tumor suppressor in tumor progression and a potential biomarker and target in patients with ccRCC.
journal_name
J Exp Clin Cancer Resjournal_title
Journal of experimental & clinical cancer research : CRauthors
Li Y,Gong Y,Ning X,Peng D,Liu L,He S,Gong K,Zhang C,Li X,Zhou Ldoi
10.1186/s13046-018-0924-ysubject
Has Abstractpub_date
2018-11-14 00:00:00pages
276issue
1eissn
0392-9078issn
1756-9966pii
10.1186/s13046-018-0924-yjournal_volume
37pub_type
杂志文章abstract:BACKGROUND:Poly C Binding Protein 1 (PCBP1) is an RNA-binding protein that binds and regulates translational activity of subsets of cellular mRNAs. Depletion of PCBP1 is implicated in various carcinomas, but the underlying mechanism in tumorigenesis remains elusive. METHODS:We performed a transcriptome-wide screen to ...
journal_title:Journal of experimental & clinical cancer research : CR
pub_type: 杂志文章
doi:10.1186/s13046-018-0840-1
更新日期:2018-08-07 00:00:00
abstract::The aim of the present study was to assess the role of virtual cystoscopy in the identification of bladder tumors. Fifteen patients (11 men and 4 women, median age: 61 years, range: 46-74 years) with a positive finding of bladder tumor at fiber-optic cystoscopy were studied by multislice-CT. Scans were downloaded to a...
journal_title:Journal of experimental & clinical cancer research : CR
pub_type: 杂志文章
doi:
更新日期:2003-03-01 00:00:00
abstract::Axillary lymphadenectomy is a very important procedure in the staging of breast cancer patients. However, it is associated with a significant morbidity rate. On the other hand, using early diagnosis we can see a high number of cases where the lymph nodes are negatives. With the intention of avoiding unnecessary axilla...
journal_title:Journal of experimental & clinical cancer research : CR
pub_type: 杂志文章
doi:
更新日期:2002-06-01 00:00:00
abstract:BACKGROUND:Prohibitin (PHB), a pleiotropic protein overexpressed in several tumor types, has been implicated in the regulation of cell proliferation, invasive migration and survival. However, PHB expression and its biological function in gallbladder cancer (GBC) remain largely unknown. METHODS:PHB and p-ERK protein ex...
journal_title:Journal of experimental & clinical cancer research : CR
pub_type: 杂志文章
doi:10.1186/s13046-016-0346-7
更新日期:2016-04-16 00:00:00
abstract::Hemangioblastomas of the filum terminale are particularly rare tumors. The authors present the case of a 62-year-old woman with a 6 month history of low-back-pain, who underwent surgery for the removal of an hemangioblastoma affecting the cauda at L2-L3 level. This highly vascularized tumour is tightly adherent to the...
journal_title:Journal of experimental & clinical cancer research : CR
pub_type: 杂志文章,评审
doi:
更新日期:2007-06-01 00:00:00
abstract:BACKGROUND:Parallel to complex alteration in molecular and cellular events, enrichment of cancer stem cells (CSC) contributes significantly in deliberation and maintenance of cisplatin resistance. Cisplatin mediated CSC enrichment is well established in various cancers, yet the underlying mechanism is largely unknown. ...
journal_title:Journal of experimental & clinical cancer research : CR
pub_type: 杂志文章
doi:10.1186/s13046-017-0636-8
更新日期:2017-11-23 00:00:00
abstract:BACKGROUND:Angiopoietin-like protein 1 (ANGPTL1) has been reported to suppress migration and invasion in lung and breast cancer, acting as a novel tumor suppressor candidate. Nevertheless, its effects on colorectal cancer (CRC) remain poorly defined. In this study, we aim to demonstrate the biological function of ANGPT...
journal_title:Journal of experimental & clinical cancer research : CR
pub_type: 杂志文章
doi:10.1186/s13046-017-0548-7
更新日期:2017-06-12 00:00:00
abstract::Radionuclide therapy with bone seeking radiopharmaceuticals is one of the oldest interventions in nuclear medicine and has been now in use for many years as an effective method of palliating painful bone metastases. Clinical indications have slowly but progressively increased starting from end-stage prostate cancer wi...
journal_title:Journal of experimental & clinical cancer research : CR
pub_type: 杂志文章,评审
doi:
更新日期:2003-12-01 00:00:00
abstract:BACKGROUND:Pancreatic cancer is a lethal disease in part because of its potential for aggressive invasion and metastasis. Lipoxin A4 (LXA4) is one of the metabolites that is derived from arachidonic acid and that is catalyzed by 15-lipoxygenase (15-LOX), and it has recently been reported to exhibit anti-cancer effects....
journal_title:Journal of experimental & clinical cancer research : CR
pub_type: 杂志文章
doi:10.1186/s13046-017-0655-5
更新日期:2017-12-11 00:00:00
abstract::The continuous growth of a solid tumor is contingent upon the induction and formation of new vascular structures (angiogenesis). Several studies have established a close correlation between the microvessel density (MVD) of a tumor and its growth capacity. Therefore, a non-invasive method to accurately assess tumor MVD...
journal_title:Journal of experimental & clinical cancer research : CR
pub_type: 杂志文章
doi:
更新日期:2002-09-01 00:00:00
abstract:BACKGROUND:Diffuse large B-cell lymphoma (DLBCL) is a heterogeneous group of tumors, with aggressive clinical course that renders prognostication and choice of treatment strategy difficult. Chemo-immunotherapy with rituximab, cyclophosphamide, doxorubicin, vincristine, prednisone (R-CHOP) is the current first-line trea...
journal_title:Journal of experimental & clinical cancer research : CR
pub_type: 杂志文章
doi:10.1186/s13046-018-0768-5
更新日期:2018-05-02 00:00:00
abstract::The heterogeneous tumor microenvironment (TME) is highly complex and not entirely understood. These complex configurations lead to the generation of oxygen-deprived conditions within the tumor niche, which modulate several intrinsic TME elements to promote immunosuppressive outcomes. Decoding these communications is n...
journal_title:Journal of experimental & clinical cancer research : CR
pub_type: 杂志文章,评审
doi:10.1186/s13046-020-01583-1
更新日期:2020-05-01 00:00:00
abstract:BACKGROUND:Gastric cancer remains a major cause of mortality and morbidity worldwide. In recent years, gene-based therapeutic strategies were confirmed promising in cancer inhibition and attracted great attention. RNA interference (RNAi) is a powerful tool for gene therapy and has been widely employed to aid in treatme...
journal_title:Journal of experimental & clinical cancer research : CR
pub_type: 杂志文章
doi:10.1186/s13046-016-0334-y
更新日期:2016-03-31 00:00:00
abstract::Transplatin (TDDP), a trans-isomer of cisplatin (CDDP), is well known to have faint cytotoxicity because its geometric structure allows less adduct formation with DNA than does CDDP. However, TDDP might have the potential to enhance the anticancer effect of 5-fluorouracil (5-FU) as well as CDDP. In this study, five ga...
journal_title:Journal of experimental & clinical cancer research : CR
pub_type: 杂志文章
doi:
更新日期:2006-06-01 00:00:00
abstract:BACKGROUND:Cancer and its therapies increase the risk of venous thromboembolism. Compared to patients without cancer, patients with cancer anticoagulated for venous thromboembolism are more likely to develop recurrent thrombotic events and major bleeding. Addressing all important outcomes including harm is of great imp...
journal_title:Journal of experimental & clinical cancer research : CR
pub_type: 杂志文章,评审
doi:10.1186/1756-9966-27-21
更新日期:2008-07-18 00:00:00
abstract::Increased expression of CD44 variants is often observed in differentiated thyroid carcinomas. To establish a method for gene diagnosis of thyroid without any additional invasions to the patients, RNA in leftover cells inside the needle used for fine needle aspiration biopsies (FNABs) was extracted to detect the expres...
journal_title:Journal of experimental & clinical cancer research : CR
pub_type: 杂志文章
doi:
更新日期:1997-09-01 00:00:00
abstract:BACKGROUND:Microtubule Targeting Agents (MTAs) including paclitaxel, colchicine and vinca alkaloids are widely used in the treatment of various cancers. As with most chemotherapeutic agents, adverse effects and drug resistance are commonly associated with the clinical use of these agents. Methyl 2-(5-fluoro-2-hydroxyph...
journal_title:Journal of experimental & clinical cancer research : CR
pub_type: 杂志文章
doi:10.1186/s13046-016-0332-0
更新日期:2016-03-31 00:00:00
abstract:BACKGROUND:Extracellular matrix (ECM) is a mediator of tumor progression. However, whether the alterations of the intraperitoneal ECM prior to tumor establishment affects the malignant progression of ovarian cancer remains elusive. METHODS:Apolipoprotein (ApoE) knock-out mice was used to analyze the intraperitoneal EC...
journal_title:Journal of experimental & clinical cancer research : CR
pub_type: 杂志文章
doi:10.1186/s13046-018-0696-4
更新日期:2018-02-20 00:00:00
abstract:BACKGROUND:Next generation sequencing (NGS) is being increasingly applied for assisting cancer molecular diagnosis. However, it is still needed to validate NGS accuracy on detection of DNA alternations based on a large number of clinical samples, especially for DNA rearrangements and copy number variations (CNVs). This...
journal_title:Journal of experimental & clinical cancer research : CR
pub_type: 杂志文章
doi:10.1186/s13046-017-0591-4
更新日期:2017-09-07 00:00:00
abstract:BACKGROUND:Glioblastoma is the most common and aggressive brain tumour in adults with a median overall survival of only 14 months after standard therapy with radiation therapy (IR) and temozolomide (TMZ). In a novel multimodal treatment approach we combined the checkpoint kinase 1 (Chk1) inhibitor SAR-020106 (SAR), dis...
journal_title:Journal of experimental & clinical cancer research : CR
pub_type: 杂志文章
doi:10.1186/s13046-019-1434-2
更新日期:2019-10-21 00:00:00
abstract:BACKGROUND:Glioblastoma is the most aggressive and most lethal primary brain tumor in the adulthood. Current standard therapies are not curative and novel therapeutic options are urgently required. Present knowledge suggests that the continued glioblastoma growth and recurrence is determined by glioblastoma stem-like c...
journal_title:Journal of experimental & clinical cancer research : CR
pub_type: 杂志文章
doi:10.1186/s13046-019-1293-x
更新日期:2019-07-16 00:00:00
abstract::The aim of this work is the in vitro study of the late effects of single proton irradiation on HTB63 human melanoma cell growth, cell cycle and cell death. The experimental conditions were focused on analyzing the effects of irradiation on the periphery of tumour that can be, in clinical practice, close to critical or...
journal_title:Journal of experimental & clinical cancer research : CR
pub_type: 杂志文章
doi:
更新日期:2001-03-01 00:00:00
abstract:BACKGROUD:Accumulating evidences indicate that circular RNAs (circRNAs), a class of non-coding RNAs, play important roles in tumorigenesis. However, the function of circRNAs in triple negative breast cancer (TNBC) is largely unknown. METHODS:We performed circRNA microarrays to identify circRNAs that are aberrantly exp...
journal_title:Journal of experimental & clinical cancer research : CR
pub_type: 杂志文章
doi:10.1186/s13046-017-0614-1
更新日期:2017-10-16 00:00:00
abstract:BACKGROUND:Endometriosis is a gynecological disease defined by the histological presence of endometrial glands and stroma outside the uterine cavity. Women with endometriosis have an increased risk of different types of malignancies, especially ovarian cancer and non-Hodgkin's lymphoma. Though there are several theorie...
journal_title:Journal of experimental & clinical cancer research : CR
pub_type: 杂志文章
doi:10.1186/1756-9966-28-49
更新日期:2009-04-09 00:00:00
abstract:BACKGROUND:Human placental development resembles tumorigenesis, due to the invasive and fusogenic potential of trophoblasts. However, these features are tightly controlled in trophoblasts. Disturbance of this spatial and temporal regulation is thought to contribute to the rare formation of choriocarcinomas. Promoter hy...
journal_title:Journal of experimental & clinical cancer research : CR
pub_type: 杂志文章
doi:10.1186/s13046-017-0634-x
更新日期:2017-11-23 00:00:00
abstract::Here we report the case of a patient with a soft tissue mass of the neck. For more than 10 years it was thought to be a branchial cyst and was later diagnosed to be a cystic lymph node metastasis from an occult thyroid carcinoma. ...
journal_title:Journal of experimental & clinical cancer research : CR
pub_type: 杂志文章
doi:
更新日期:2002-03-01 00:00:00
abstract::Occult carcinoma cells in peripheral blood of breast cancer (BC) patients is generally associated with poor disease prognosis. Reverse transcriptase-polymerase chain reaction (RT-PCR) is a sensitive method for revealing rare circulating cancer cells. The target mRNA must be carefully chosen, as it must be expressed on...
journal_title:Journal of experimental & clinical cancer research : CR
pub_type: 杂志文章
doi:
更新日期:2005-06-01 00:00:00
abstract::An amendment to this paper has been published and can be accessed via the original article. ...
journal_title:Journal of experimental & clinical cancer research : CR
pub_type: 杂志文章,已发布勘误
doi:10.1186/s13046-020-01663-2
更新日期:2020-08-24 00:00:00
abstract:BACKGROUND:In spite of recent advances in diagnostic and therapeutic measures, the prognosis of hepatocellular carcinoma (HCC) patients remains poor. Therefore, it is crucial to understand what factors are involved in promoting development of HCC. Evidence is accumulating that members of the chemokine receptor family a...
journal_title:Journal of experimental & clinical cancer research : CR
pub_type: 杂志文章
doi:10.1186/1756-9966-29-31
更新日期:2010-04-11 00:00:00
abstract:BACKGROUND:Non-small cell lung cancer (NSCLC) patients with sensitive epidermal growth factor receptor (EGFR) mutations are successfully treated with EGFR tyrosine kinase inhibitors (EGFR-TKIs); however, resistance to treatment inevitably occurs. Given lipid metabolic reprogramming is widely known as a hallmark of canc...
journal_title:Journal of experimental & clinical cancer research : CR
pub_type: 杂志文章
doi:10.1186/s13046-019-1120-4
更新日期:2019-03-15 00:00:00