A novel miR-200c/c-myc negative regulatory feedback loop is essential to the EMT process, CSC biology and drug sensitivity in nasopharyngeal cancer.

Overexpression of the c-Myc oncogene has been implicated in cancer stem cell - like (CSC) phenotypes and epithelial-to-mesenchymal transition (EMT) in cancer. However, the underlying molecular mechanism by which c-Myc regulates EMT and CSC potential in remains unclear. In the present study, we showed that the expression of c-Myc protein is inversely correlated with microRNA (miR)-200c expression in primary tumor samples from nasopharyngeal cancer (NPC) patients.

Sulforaphane inhibits cancer stem-like cell properties and cisplatin resistance through miR-214-mediated downregulation of c-MYC in non-small cell lung cancer.

We herein report that sulforaphane (SFN), a potent anti-cancer and well-tolerated dietary compound, inhibits cancer stem-like cell (CSC) properties and enhances therapeutic efficacy of cisplatin in human non-small cell lung cancer (NSCLC). SFN exerted these functions through upregulation of miR-214, which in turn targets the coding region of c-MYC. This finding was further corroborated by our observations that plasmid or lentiviral vector-mediated expression of 3'UTR-less c-MYC cDNA and cisplatin- or doxorubicin-induced endogenous c-MYC accumulation was similarly suppressed by either SFN or miR-214.

Nuclear β-catenin accumulation is associated with increased expression of Nanog protein and predicts poor prognosis of non-small cell lung cancer.

Background: Although the prognostic roles of β-catenin expression in non-small cell lung cancer (NSCLC) have been reported in several immunohistochemical (IHC) studies, the results were not consistent because some studies lack sufficient number of the positive cases or did not evaluate the subcellular localization features of the protein.

Method: In this study, we have evaluated the expression levels and subcellular localization of β-catenin and Nanog proteins IHC staining in tissue specimens from 309 patients with NSCLC, and explored their association with clinicopathological features and patient outcome.

Results: We showed that patients with negative expression of membranous beta-catenin had a trend towards shorter survival (p=0.

Cancer stem-like cell properties are regulated by EGFR/AKT/β-catenin signaling and preferentially inhibited by gefitinib in nasopharyngeal carcinoma.

We report that the epidermal growth factor receptor (EGFR) pathway plays a critical role in regulating cancer stem-like cells (CSCs) in nasopharyngeal carcinoma (NPC), one of the most common malignant tumors in Southeast Asia. Effects of EGFR on maintaining CSCs are mainly mediated by AKT signaling, and β-catenin is responsible for governing CSC properties in response to EGFR/AKT activation. Significantly, CSCs are enriched by cisplatin and decreased by gefitinib in NPC xenograft models.

[A murine model of human primary hepatic lymphoma constructed by surgical orthotopic implantation of histologically intact human tumor tissue and in vivo continuous orthotopic passage].

Objective: To establish a nude murine model of human primary hepatic lymphoma (PHL) with surgical orthotopic implantation of histologically intact human tumor tissue and in vivo continuous orthotopic passage.

Methods: Histologically intact lymphoma tissues harvested intraoperatively from a PHL patient were orthotopically transplanted into liver parenchyma of nude mice and in vivo continuous orthotopic passage in nude mice was used to develop a nude murine model mimicking the biological characteristics of PHL patients. Histopathology (light microscopy and immunohistochemistry), serological test, karyotypic analysis and flow cytometry were used to explore the tumorigenicity, invasion and metastasis.

Antisense oligonucleotide against hTERT (Cantide) inhibits tumor growth in an orthotopic primary hepatic lymphoma mouse model.

Background: Human xenograft models, resulting from orthotopic transplantation (implantation into the anatomically correct site) of histologically intact tissue into animals, are important for investigating local tumor growth, vascular and lymphatic invasion at the primary tumor site and metastasis.

Methodology/principal Findings: We used surgical orthotopic transplantation to establish a nude mouse model of primary hepatic lymphoma (PHL), HLBL-0102. We performed orthotopic transfer of the HLBL-0102 tumor for 42 generations and characterized the tumor cells.

Activation of the P2Y1 receptor induces apoptosis and inhibits proliferation of prostate cancer cells.

G protein-coupled receptors, the largest cell surface receptor family, have emerged as critical players in cell death and survival. High gene expression level of the G(q)-coupled P2Y(1) nucleotide receptor in PC-3 prostate cancer cells was demonstrated using real-time quantitative PCR and confirmed by Western blotting and confocal laser scanning microscopy. A selective P2Y(1) receptor agonist, the ADP analogue MRS2365, concentration-dependently induced intracellular calcium mobilization (EC(50) 5.

[Establishment of a nude mouse model of highly metastatic gastric lymphoma constructed with orthotopic transplantation of surgical specimen].

Objective: To construct a mouse model of highly metastatic gastric lymphoma with orthotopic transplantation of human primary gastric lymphoma specimen.

Methods: A fresh surgical specimen of primary gastric lymphoma was obtained intraoperatively and implanted into the submucosa of stomach in nude mice. Tumor formation, invasion, metastasis, morphological characteristics under light microscopy and electron microscopy, immunohistochemistry,and the karyotype of orthotopically transplanted tumor cells were studied.

A liver-metastatic model of human primary gastric lymphoma in nude mice orthotopically constructed by using histologically intact patient specimens.

Background And Objective: In recent years, incidence and mortality of lymphoma are markedly increasing worldwide. However, the pathogenesis and mechanism of invasion and metastasis for lymphoma are not yet fully clarified. It is mainly due to the lack of ideal animal models, which can precisely simulate the invasion and metastasis of lymphoma in the human body.

[Highly metastatic nude mouse model of human primary gastric lymphoma constructed by surgical orthotopic transplantation and in vivo continuous screening method].

Objective: To develop a series of high metastatic models of human gastric malignant lymphoma in nude mice by orthotopic transplantation.

Methods: Two histologically intact primary and hepatic metastatic fragments derived from surgical specimen of a patient with primary gastric lymphoma were implanted into the submucosa of stomach in nude mice. Highly metastatic and specific organ metastatic models were screened by selective orthotopic passage in nude mice.

[Establishment of a highly-metastatic model of human primary melanoma of the small intestine orthotopically transplanted in the small intestine of nude mice].

Objective: To provide an useful animal model for exploring metastatic biology and anti-metastatic therapy of primary malignant melanoma of the small intestine.

Methods: A 49-year old male patient with malignant melanoma was treated by surgery, and the primary tumor in the small intestine and a metastatic tumor in the liver were removed. The diagnosis of malignant melanoma was confirmed by histopathology.

[Establishment of nude mice liver metastatic model of human primary malignant melanoma of the small intestine].

Objective: To provide ideal animal models for exploring pathogenesis and experimental therapy of primary malignant melanoma of the small intestine.

Methods: The histologically intact primary and liver metastatic fragments derived from surgical specimens of one patient with metastatic malignant melanoma of the small intestine were orthotopically implanted in the small intestinal mucous layer of nude mice. The take rate, invasion and liver metastasis were observed.

[AF172993 sequence of Plunc in GenBank database is not the complete CDS].

Objective: To determine AF172993 sequence is either the complete CDS or a transcript variant.

Methods: RT-PCR was used to amplify the CDS sequence of Plunc, which was subsequently cloned into the pEGFP-N1 eukaryotic expression vector. After bi-directional sequence analysis, the sequence obtained was blasted against the AF172993 sequence, nr database and human genome database.

[Establishment of liver metastasis model of human primary colonic lymphoma by orthotopic transplantation].

Objective: To provide an ideal animal model for exploring pathogenesis and experimental treatment of primary colonic lymphoma.

Methods: Primary colonic and liver metastatic lymphoma tissues were obtained from the surgical specimens,and transplanted into colonic mucosa of nude mice respectively. The tumorigenesis, invasion, metastasis and morphology of the transplanted tumor were observed.

[Establishment of a nude mouse model of orthotopically transplanted human primary malignant lymphoma of the liver].

Objective: To establish a nude mouse model of orthotopically transplanted human primary malignant lymphoma of the liver, and to serve researches on pathogenesis and experimental treatment of this disease.

Methods: Small pieces of lymphoma tissues freshly taken from patients with primary lymphoma of the liver were orthotopically transplanted into the liver parenchyma in nude mice. Tumorgenicity, invasion, metastasis, and morphological characteristics were examined by light and electron microscopy and immunohistochemistry.

Reexploring the possible roles of some genes associated with nasopharyngeal carcinoma using microarray-based detection.

In gene expression profiling, nasopharyngeal carcinoma (NPC) 5-8F cells differ from 6-10B cells in terms of their high tumorigenicity and metastatic ability. Differentially expressed genes from the two cell types were analyzed by combining with MILANO (the automatic custom annotation of microarray results which is based on all the available published work in PubMed). The results showed that five genes, including CTSD, P63, CSE1L, BPAG1 and EGR1, have been studied or mentioned in published work on NPC.

Effects of different concentrations of amino acids in the culture medium on preimplantation mouse embryo development in vitro.

Objective: To evaluate the effects of amino acids (AA) on the development of in vitro cultured preimplantation embryos of Kunming mice, and define the optimal AA concentration for embryo culture.

Methods: Totally 630 zygotes were collected from the oviducts of superovulated female Kunming mice, which were cultured in protein-free potassium simplex optimized medium (mKSOM) supplemented with Eagle's essential amino acids and Eagle's non-essential amino acids of different concentrations (mKSOM, mKSOM+1/16AA, mKSOM+1/8AA, mKSOM+1/4AA, mKSOM+1/2AA, mKSOM+AA, and mKSOM+2AA).

Results: The embryos cultured with the amino acids showed higher development rate to both 8-cell embryo stage and blastocyst stage than those cultured without amino acids.

[Establishment and characteristics of orthotopically transplanted model of human primary malignant small intestinal lymphoma in nude mice].

Objective: To establish orthotopically transplanted model of human malignant small intestinal lymphoma in nude mice and analyze their biologic characteristics.

Methods: Small intestinal lymphoma tissues from 5 patients were transplanted into intestinal mucosa of nude mice. Tumorgenecity, invasion and metastasis of the transplanted tumors were observed by morphological analyses (light microscopy, electron microscopy and immunohistochemistry), karyotyping and DNA quantitative assay.

Liver metastasis models of human colorectal carcinoma established in nude mice by orthotopic transplantation and their biologic characteristic.

AIM:To establish a liver metastasis model of human colorectal carcinoma in nude mice.METHODS:Orthotopic transplantation of histologically intact colorectal tissues from patients into colorectal mucosa of nude mice. Tumorgenicity, invasion, metastasis and morphological characteristics of the transplanted tumors were studied by light microscopy, electron microscopy and immunohistochemistry.