guanine/kansè

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Guanine nucleotide-binding protein subunit beta-4 promotes gastric cancer progression via activating Erk1/2

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Gastric cancer (GC) is one of the most common and lethal malignancies worldwide, and its poor prognosis is mainly due to the rapid tumor progression including tumor invasion, distant metastasis, etc. Understanding the molecular mechanisms regulating GC progression lays the basis for the development

Differential mechanism of cytostatic effect of (E)-5-(2-bromovinyl)-2'-deoxyuridine, 9-(1,3-dihydroxy-2-propoxymethyl)guanine, and other antiherpetic drugs on tumor cells transfected by the thymidine kinase gene of herpes simplex virus type 1 or type 2.

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After they have been transfected with the herpes simplex virus type 1 (HSV-1) or type 2 (HSV-2) thymidine kinase (TK) gene murine mammary carcinoma (FM3A) cells become highly sensitive to the growth inhibitory properties of the antiherpetic agents (E)-5-(2-bromovinyl)-2'-deoxyuridine (BVDU),

(99m)Tc-EC-guanine: synthesis, biodistribution, and tumor imaging in animals.

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OBJECTIVE DNA markers are useful in assessing cell proliferation. The purpose of this study was to synthesize (99m)Tc-ethylenedicysteine-guanine (EC-Guan) for evaluation of cell proliferation. METHODS Tumor cells were incubated with (99m)Tc-EC-Guan for cell cycle analysis. Prostate tumor cells that

Aflatoxin exposure measured by urinary excretion of aflatoxin B1-guanine adduct and hepatitis B virus infection in areas with different liver cancer incidence in Kenya.

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Two major etiological agents, hepatitis B virus and aflatoxin B1, are considered to be involved in the induction of liver cancer in Africa. In order to elucidate any synergistic effect of these two agents we conducted a study in various parts of Kenya with different liver cancer incidence in order

Synthesis and preliminary biological evaluation of 6-O-[11C]-[(methoxymethyl)benzyl]guanines, new potential PET breast cancer imaging agents for the DNA repair protein AGT.

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Novel radiolabeled O(6)-benzylguanine derivatives, 6-O-[(11)C]-[(methoxymethyl)benzyl]guanines ([(11)C]p-O(6)-MMBG, 1a; [(11)C]m-O(6)-MMBG, 1b; ([(11)C]o-O(6)-MMBG, 1c), have been synthesized for evaluation as new potential positron emission tomography (PET) breast cancer imaging agents for DNA

Levels of N7-(2-hydroxyethyl)guanine as a molecular dosimeter of drug delivery to human brain tumors.

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The level of N7-(2-hydroxyethyl)guanine (N7-HOEtG), one of the DNA alkylation products formed by 1,3-bis(2-chloroethyl)-1-nitrosourea (BCNU) treatment, was measured in human brain tumor samples by high performance liquid chromatography with electrochemical detection. The tumors from 6 recurrent

Evaluation of 9-[(3-18F-fluoro-1-hydroxy-2-propoxy)methyl]guanine ([18F]-FHPG) in vitro and in vivo as a probe for PET imaging of gene incorporation and expression in tumors.

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Preparation of 9-[(3-18F-fluoro-1-hydroxy-2-propoxy)methyl]-guanine ([18F]-FHPG) for clinical use, and its evaluation as a positron emission tomography (PET) imaging agent for gene incorporation and expression in tumors are reported. In vitro studies in human colon cancer cells, HT-29, transduced

Mutational spectra at the hypoxanthine-guanine phosphoribosyltransferase (HPRT) locus in T-lymphocytes of nonsmoking and smoking lung cancer patients.

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Molecular analysis of mutations at the hypoxanthine-guanine phosphoribosyltransferase (HPRT) locus in peripheral blood T-lymphocytes can provide information on mechanisms of somatic in vivo mutation in populations exposed to exogenous carcinogens and in individuals with inherent susceptibility to

Cytotoxicity of the novel glutathione-activated thiopurine prodrugs cis-AVTP [cis-6-(2-acetylvinylthio)purine] and trans-AVTG [trans-6-(2-acetylvinylthio)guanine] results from the National Cancer Institute's anticancer drug screen.

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cis-6-(2-Acetylvinylthio)purine (cis-AVTP) and trans-6-(2-acetylvinylthio)guanine (trans-AVTG) are glutathione-activated prodrugs of 6-mercaptopurine (6-MP) and 6-thioguanine (6-TG), respectively. Previously, we showed that the prodrugs exhibited less in vivo toxicity in mice than did 6-TG, whereas

The sequence specificity of the anti-tumour drug, cisplatin, in telomeric DNA sequences compared with consecutive guanine DNA sequences.

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The sequence specificity of the anti-tumour drug, cisplatin, was determined in a DNA sequence that contained seven telomeric repeats and a run of ten consecutive guanine bases. Cisplatin preferentially forms DNA adducts at consecutive guanine sequences. Hence these DNA sequences were examined in

O6-(fluorobenzyl)guanine and chloroethylnitrosourea in xenografted rat brain tumor in vivo.

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O6-methylguanine-DNA methyltransferase (MGMT), one of the DNA repair enzymes, potently repairs DNA damage induced by chloroethylnitrosoureas (CENUs). Depletion of MGMT activity after treatment with MGMT inhibitors increases the sensitivity of tumor cells to CENUs. We tested the effect of O6-(4-, 3-

Polypod-like structured guanine-rich oligonucleotide aptamer as a selective and cytotoxic nanostructured DNA to cancer cells

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Guanine-rich oligonucleotide (GRO) can be developed as an effective anticancer agent owing to its high selectivity, affinity, and antiproliferative activity in cancer cells. In this study, to increase the potency of GRO29A, a 29-mer GRO aptamer against nucleolin, an overexpressed protein in cancer

Inhibitory effects of 9-(4-thio-beta-D-ribo-pentofuranosyl)guanine on tumor growth and angiogenesis.

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BACKGROUND To find a nucleoside with anti-angiogenic activity, we tried to screen an active compound from our nucleoside library. METHODS The compound inhibiting the growth of human umbilical vein endothelial cell (HUVEC) induced by the conditioned medium of lung carcinoma cell line PC-9 was

Quantitative relationship between guanine O(6)-alkyl lesions produced by Onrigin™ and tumor resistance by O(6)-alkylguanine-DNA alkyltransferase.

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O(6)-Alkylguanine-DNA alkyltransferase (AGT) mediates tumor resistance to alkylating agents that generate guanine O(6)-chloroethyl (Onrigin™ and carmustine) and O(6)-methyl (temozolomide) lesions; however, the relative efficiency of AGT protection against these lesions and the degree of resistance

Intratumoral administration of secondary lymphoid chemokine and unmethylated cytosine-phosphorothioate-guanine oligodeoxynucleotide synergistically inhibits tumor growth in vivo.

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Secondary lymphoid tissue chemokine (SLC), which is expressed in T cell zones of secondary lymphoid organs, including the spleen and lymph nodes, strongly recruits both T lymphocytes and mature dendritic cells. As appropriate interaction of tumor-specific T cells and mature dendritic cells, equipped

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