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  1. Article ; Online: Design, Synthesis and In Vitro Cytotoxic Activity of New 6,9-Disubstituted Purine Analogues.

    Kucukdumlu, Asligul / Tuncbilek, Meral / Guven, Ebru Bilget / Atalay, Rengul Cetin

    Acta chimica Slovenica

    2021  Volume 67, Issue 1, Page(s) 70–82

    Abstract: A series of new 6,9-disubstituted purine analogs with 4-substituted piperazine at C-6 and 4-substituted benzyl at N-9 were designed and synthesized in four steps. All synthesized compounds (7-26) were screened initially for their in vitro anticancer ... ...

    Abstract A series of new 6,9-disubstituted purine analogs with 4-substituted piperazine at C-6 and 4-substituted benzyl at N-9 were designed and synthesized in four steps. All synthesized compounds (7-26) were screened initially for their in vitro anticancer activity on Huh7 liver, HCT116 colon and MCF7 breast carcinoma cell lines. Cytotoxic bioactivity studies revealed that all compounds screened, with compound 19 being the exception, were found to have promising cytotoxic activities at IC50 range of 0.05-21.8 ∆M against cancer cells Huh7, HCT116 and MCF7. Among the prepared purine analogs, two of them (12 and 22) exhibited excellent cytotoxic activities, with IC50 0.08-0.13 ∆M, on Huh7 cells comparable to camptothecin (CPT) and better than cladribine, fludarabine and 5-FU. Afterwards, the evaluation of cytotoxicity of the most potent purine analogs was screened against further hepatocellular cancer (HCC) cell lines. The 6-(4-(4-trifluoromethylphenyl)piperazine (12) and 6-(4-(3,4-dichlorophenyl)piperazine analogs (25) displayed a significant IC50 values (IC50 < 0.1-0.13 ∆M) comparable to CPT and better cytotoxic bioactivity when compared with 5-FU, cladribine and fludarabine on HCC cells (Huh7 and HepG2).
    MeSH term(s) Antineoplastic Agents/chemical synthesis ; Antineoplastic Agents/pharmacology ; Cell Line, Tumor ; Cladribine/pharmacology ; Drug Design ; Drug Screening Assays, Antitumor ; Fluorouracil/pharmacology ; Humans ; Molecular Structure ; Purines/chemical synthesis ; Purines/pharmacology ; Vidarabine/analogs & derivatives ; Vidarabine/pharmacology
    Chemical Substances Antineoplastic Agents ; Purines ; Cladribine (47M74X9YT5) ; Vidarabine (FA2DM6879K) ; fludarabine (P2K93U8740) ; Fluorouracil (U3P01618RT)
    Language English
    Publishing date 2021-02-08
    Publishing country Slovenia
    Document type Journal Article
    ZDB-ID 2029709-9
    ISSN 1580-3155 ; 1318-0207
    ISSN (online) 1580-3155
    ISSN 1318-0207
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Design, Synthesis and Biological Evaluation of Novel Triazolothiadiazoles Derived from NSAIDs as Anticancer Agents.

    Aytaç, Peri / Sahin, Irem Durmaz / Atalay, Rengül Çetin / Tozkoparan, Birsen

    Anti-cancer agents in medicinal chemistry

    2021  Volume 22, Issue 7, Page(s) 1340–1347

    Abstract: Background: Although transplantation, surgical resection, and tumor ablation are treatment options available following early diagnosis of HCC, poor prognosis and high recurrence rates restrict the efficacy of these approaches. Hence, small molecules ... ...

    Abstract Background: Although transplantation, surgical resection, and tumor ablation are treatment options available following early diagnosis of HCC, poor prognosis and high recurrence rates restrict the efficacy of these approaches. Hence, small molecules with high selectivity and bioactivity are urgently required.
    Objective: This study presents the synthesis of a series of new triazolothiadiazole derivatives (1a-3j) with NSAID moieties and their cytotoxic bioactivities.
    Methods: The new synthetic derivatives (1-3; 1a-3j) and NSAIDs ibuprofen, naproxen, and flurbiprofen that commonly used in clinics were screened against human liver (Huh7), breast (MCF7), and colon (HCT116) carcinoma cell lines under in vitro conditions via NCI-sulforhodamine B assay.
    Results: The 4-methoxyphenyl substituted condensed derivatives 1h, 2h, and 3h were the most active compounds. Based on its high potency, compound 3h was selected for the further biological evaluation of hepatocellular carcinoma cell lines, and the mechanisms underlying cell death induced by 3h were determined. The results revealed that compound 3h induced apoptosis and cell cycle arrest in the sub G1 phase in human liver cancer cells.
    Conclusion: These new small molecules may be used for the development of new lead compounds.
    MeSH term(s) Anti-Inflammatory Agents, Non-Steroidal/pharmacology ; Antineoplastic Agents ; Carcinoma, Hepatocellular/drug therapy ; Cell Line, Tumor ; Cell Proliferation ; Drug Screening Assays, Antitumor ; Humans ; Liver Neoplasms/drug therapy ; Molecular Structure ; Structure-Activity Relationship
    Chemical Substances Anti-Inflammatory Agents, Non-Steroidal ; Antineoplastic Agents
    Language English
    Publishing date 2021-06-24
    Publishing country Netherlands
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2217610-X
    ISSN 1875-5992 ; 1871-5206
    ISSN (online) 1875-5992
    ISSN 1871-5206
    DOI 10.2174/1871520621666210623093550
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Context dependent isoform specific PI3K inhibition confers drug resistance in hepatocellular carcinoma cells.

    Narci, Kubra / Kahraman, Deniz Cansen / Koyas, Altay / Ersahin, Tulin / Tuncbag, Nurcan / Atalay, Rengul Cetin

    BMC cancer

    2022  Volume 22, Issue 1, Page(s) 320

    Abstract: Background: Targeted therapies for Primary liver cancer (HCC) is limited to the multi-kinase inhibitors, and not fully effective due to the resistance to these agents because of the heterogeneous molecular nature of HCC developed during chronic liver ... ...

    Abstract Background: Targeted therapies for Primary liver cancer (HCC) is limited to the multi-kinase inhibitors, and not fully effective due to the resistance to these agents because of the heterogeneous molecular nature of HCC developed during chronic liver disease stages and cirrhosis. Although combinatorial therapy can increase the efficiency of targeted therapies through synergistic activities, isoform specific effects of the inhibitors are usually ignored. This study concentrated on PI3K/Akt/mTOR pathway and the differential combinatory bioactivities of isoform specific PI3K-α inhibitor (PIK-75) or PI3K-β inhibitor (TGX-221) with Sorafenib dependent on PTEN context.
    Methods: The bioactivities of inhibitors on PTEN adequate Huh7 and deficient Mahlavu cells were investigated with real time cell growth, cell cycle and cell migration assays. Differentially expressed genes from RNA-Seq were identified by edgeR tool. Systems level network analysis of treatment specific pathways were performed with Prize Collecting Steiner Tree (PCST) on human interactome and enriched networks were visualized with Cytoscape platform.
    Results: Our data from combinatory treatment of Sorafenib and PIK-75 and TGX-221 showed opposite effects; while PIK-75 displays synergistic effects on Huh7 cells leading to apoptotic cell death, Sorafenib with TGX-221 display antagonistic effects and significantly promotes cell growth in PTEN deficient Mahlavu cells. Signaling pathways were reconstructed and analyzed in-depth from RNA-Seq data to understand mechanism of differential synergistic or antagonistic effects of PI3K-α (PIK-75) and PI3K-β (TGX-221) inhibitors with Sorafenib. PCST allowed as to identify AOX1 and AGER as targets in PI3K/Akt/mTOR pathway for this combinatory effect. The siRNA knockdown of AOX1 and AGER significantly reduced cell proliferation in HCC cells.
    Conclusions: Simultaneously constructed and analyzed differentially expressed cellular networks presented in this study, revealed distinct consequences of isoform specific PI3K inhibition in PTEN adequate and deficient liver cancer cells. We demonstrated the importance of context dependent and isoform specific PI3K/Akt/mTOR signaling inhibition in drug resistance during combination therapies. ( https://github.com/cansyl/Isoform-spesific-PI3K-inhibitor-analysis ).
    MeSH term(s) Carcinoma, Hepatocellular/drug therapy ; Carcinoma, Hepatocellular/genetics ; Carcinoma, Hepatocellular/metabolism ; Cell Line, Tumor ; Drug Resistance ; Humans ; Liver Neoplasms/drug therapy ; Liver Neoplasms/genetics ; Liver Neoplasms/metabolism ; Niacinamide/therapeutic use ; Phenylurea Compounds/therapeutic use ; Phosphatidylinositol 3-Kinases/metabolism ; Protein Isoforms/genetics ; Proto-Oncogene Proteins c-akt/metabolism
    Chemical Substances Phenylurea Compounds ; Protein Isoforms ; Niacinamide (25X51I8RD4) ; Proto-Oncogene Proteins c-akt (EC 2.7.11.1)
    Language English
    Publishing date 2022-03-24
    Publishing country England
    Document type Journal Article
    ZDB-ID 2041352-X
    ISSN 1471-2407 ; 1471-2407
    ISSN (online) 1471-2407
    ISSN 1471-2407
    DOI 10.1186/s12885-022-09357-y
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Transfer learning for drug-target interaction prediction.

    Dalkıran, Alperen / Atakan, Ahmet / Rifaioğlu, Ahmet S / Martin, Maria J / Atalay, Rengül Çetin / Acar, Aybar C / Doğan, Tunca / Atalay, Volkan

    Bioinformatics (Oxford, England)

    2023  Volume 39, Issue 39 Suppl 1, Page(s) i103–i110

    Abstract: Motivation: Utilizing AI-driven approaches for drug-target interaction (DTI) prediction require large volumes of training data which are not available for the majority of target proteins. In this study, we investigate the use of deep transfer learning ... ...

    Abstract Motivation: Utilizing AI-driven approaches for drug-target interaction (DTI) prediction require large volumes of training data which are not available for the majority of target proteins. In this study, we investigate the use of deep transfer learning for the prediction of interactions between drug candidate compounds and understudied target proteins with scarce training data. The idea here is to first train a deep neural network classifier with a generalized source training dataset of large size and then to reuse this pre-trained neural network as an initial configuration for re-training/fine-tuning purposes with a small-sized specialized target training dataset. To explore this idea, we selected six protein families that have critical importance in biomedicine: kinases, G-protein-coupled receptors (GPCRs), ion channels, nuclear receptors, proteases, and transporters. In two independent experiments, the protein families of transporters and nuclear receptors were individually set as the target datasets, while the remaining five families were used as the source datasets. Several size-based target family training datasets were formed in a controlled manner to assess the benefit provided by the transfer learning approach.
    Results: Here, we present a systematic evaluation of our approach by pre-training a feed-forward neural network with source training datasets and applying different modes of transfer learning from the pre-trained source network to a target dataset. The performance of deep transfer learning is evaluated and compared with that of training the same deep neural network from scratch. We found that when the training dataset contains fewer than 100 compounds, transfer learning outperforms the conventional strategy of training the system from scratch, suggesting that transfer learning is advantageous for predicting binders to under-studied targets.
    Availability and implementation: The source code and datasets are available at https://github.com/cansyl/TransferLearning4DTI. Our web-based service containing the ready-to-use pre-trained models is accessible at https://tl4dti.kansil.org.
    MeSH term(s) Neural Networks, Computer ; Peptide Hydrolases ; Software ; Machine Learning
    Chemical Substances Peptide Hydrolases (EC 3.4.-)
    Language English
    Publishing date 2023-06-30
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1422668-6
    ISSN 1367-4811 ; 1367-4803
    ISSN (online) 1367-4811
    ISSN 1367-4803
    DOI 10.1093/bioinformatics/btad234
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Development of a novel zebrafish xenograft model in ache mutants using liver cancer cell lines.

    Avci, M Ender / Keskus, Ayse Gokce / Targen, Seniye / Isilak, M Efe / Ozturk, Mehmet / Atalay, Rengul Cetin / Adams, Michelle M / Konu, Ozlen

    Scientific reports

    2018  Volume 8, Issue 1, Page(s) 1570

    Abstract: Acetylcholinesterase (AChE), an enzyme responsible for degradation of acetylcholine, has been identified as a prognostic marker in liver cancer. Although in vivo Ache tumorigenicity assays in mouse are present, no established liver cancer xenograft model ...

    Abstract Acetylcholinesterase (AChE), an enzyme responsible for degradation of acetylcholine, has been identified as a prognostic marker in liver cancer. Although in vivo Ache tumorigenicity assays in mouse are present, no established liver cancer xenograft model in zebrafish using an ache mutant background exists. Herein, we developed an embryonic zebrafish xenograft model using epithelial (Hep3B) and mesenchymal (SKHep1) liver cancer cell lines in wild-type and ache
    MeSH term(s) Acetylcholinesterase/deficiency ; Animals ; Cell Line, Tumor ; Disease Models, Animal ; Heterografts ; Liver Neoplasms/pathology ; Neoplasm Transplantation ; Zebrafish
    Chemical Substances Acetylcholinesterase (EC 3.1.1.7)
    Language English
    Publishing date 2018-01-25
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-018-19817-w
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  6. Article ; Online: Synthesis of novel substituted purine derivatives and identification of the cell death mechanism.

    Demir, Zeynep / Guven, Ebru Bilget / Ozbey, Suheyla / Kazak, Canan / Atalay, Rengul Cetin / Tuncbilek, Meral

    European journal of medicinal chemistry

    2015  Volume 89, Page(s) 701–720

    Abstract: Novel 9-(substituted amino/piperazinoethyl)adenines (4-12), 6-(substituted piperazino/amino)purines (15-27), 9-(p-toluenesulfonyl/cyclopentyl/ethoxycarbonylmethyl)-6-(substituted amino/piperazino)purines (28-34, 36, 37, 38-41) were synthesized and ... ...

    Abstract Novel 9-(substituted amino/piperazinoethyl)adenines (4-12), 6-(substituted piperazino/amino)purines (15-27), 9-(p-toluenesulfonyl/cyclopentyl/ethoxycarbonylmethyl)-6-(substituted amino/piperazino)purines (28-34, 36, 37, 38-41) were synthesized and evaluated initially for their cytotoxic activities on liver Huh7, breast T47D and colon HCT116 carcinoma cells. N(6)-(4-Trifluoromethylphenyl)piperazine derivative (17) and its 9-(p-toluene-sulfonyl)/9-cyclopentyl analogues (28, 36) had promising cytotoxic activities. Compounds 17, 28 and 36 were further analysed for their cytotoxicity in a panel of a liver cancer cell lines. The compound 36 had better cytotoxic activities (IC50 ≤ 1 μM) than the nucleobase 5-FU and nucleosides fludarabine, cladribine, and pentostatine on Huh7 cells. Cytotoxicity induced by 36 was later identified as senescence associated cell death by SA-β-Gal assay.
    MeSH term(s) Antineoplastic Agents/chemical synthesis ; Antineoplastic Agents/chemistry ; Antineoplastic Agents/pharmacology ; Cell Death/drug effects ; Cell Proliferation/drug effects ; Dose-Response Relationship, Drug ; Drug Screening Assays, Antitumor ; HCT116 Cells ; Hep G2 Cells ; Humans ; Models, Molecular ; Molecular Structure ; Purines/chemistry ; Purines/pharmacology ; Structure-Activity Relationship ; Tumor Cells, Cultured
    Chemical Substances Antineoplastic Agents ; Purines ; purine (W60KTZ3IZY)
    Language English
    Publishing date 2015-01-07
    Publishing country France
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 188597-2
    ISSN 1768-3254 ; 0009-4374 ; 0223-5234
    ISSN (online) 1768-3254
    ISSN 0009-4374 ; 0223-5234
    DOI 10.1016/j.ejmech.2014.10.080
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  7. Article: Bi-k-bi clustering: mining large scale gene expression data using two-level biclustering.

    Carkacioğlu, Levent / Atalay, Rengül Cetin / Konu, Ozlen / Atalay, Volkan / Can, Tolga

    International journal of data mining and bioinformatics

    2011  Volume 4, Issue 6, Page(s) 701–721

    Abstract: Due to the increase in gene expression data sets in recent years, various data mining techniques have been proposed for mining gene expression profiles. However, most of these methods target single gene expression data sets and cannot handle all the ... ...

    Abstract Due to the increase in gene expression data sets in recent years, various data mining techniques have been proposed for mining gene expression profiles. However, most of these methods target single gene expression data sets and cannot handle all the available gene expression data in public databases in reasonable amount of time and space. In this paper, we propose a novel framework, bi-k-bi clustering, for finding association rules of gene pairs that can easily operate on large scale and multiple heterogeneous data sets. We applied our proposed framework on the available NCBI GEO Homo sapiens data sets. Our results show consistency and relatedness with the available literature and also provides novel associations.
    MeSH term(s) Cluster Analysis ; Data Mining/methods ; Databases, Genetic ; Gene Expression ; Gene Expression Profiling ; Humans ; Oligonucleotide Array Sequence Analysis
    Language English
    Publishing date 2011-02-24
    Publishing country Switzerland
    Document type Journal Article
    ISSN 1748-5673
    ISSN 1748-5673
    DOI 10.1504/ijdmb.2010.037548
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Synthesis of Novel Benzothiazole-Piperazine Derivatives and Their Biological Evaluation as Acetylcholinesterase Inhibitors and Cytotoxic Agents.

    Gurdal, Enise Ece / Turgutalp, Bengisu / Gulcan, Hayrettin Ozan / Ercetin, Tugba / Sahin, Mustafa Fethi / Durmaz, Irem / Atalay, Rengul Cetin / Nguyen, Quoc Dat / Sippl, Wolfgang / Yarim, Mine

    Anti-cancer agents in medicinal chemistry

    2017  Volume 17, Issue 13, Page(s) 1837–1845

    Abstract: Objective and method: A new series of benzothiazole-piperazine derivatives was synthesized and a complete chemical characterization of the novel compounds was provided. In vitro cytotoxic activities were screened against colorectal (HCT-116), breast ( ... ...

    Abstract Objective and method: A new series of benzothiazole-piperazine derivatives was synthesized and a complete chemical characterization of the novel compounds was provided. In vitro cytotoxic activities were screened against colorectal (HCT-116), breast (MCF-7) and hepatocellular (Huh7) cancer cell lines by Sulforhodamine B assay.
    Result and discussion: All compounds showed cytotoxic activity against hepatocellular (Huh7) and breast (MCF-7) cancer cell lines. Dihalo substituted benzylpiperazine derivatives (2a, 2e) had the highest cytotoxic activities in all the tested cell lines. In addition, acetylcholinesterase (AChE) and butyrylcholinesterase (BuChE) inhibitory activities of synthesized compounds were investigated by in vitro Ellman's method. Compound 2j led to moderate and selective inhibition against AChE. Docking study was utilized to understand the binding mode of compound 2j in comparision with donepezil on AChE. The other tested compounds showed weak or no inhibition against AChE as promising anticancer agents.
    MeSH term(s) Acetylcholinesterase/drug effects ; Benzothiazoles/chemistry ; Cell Line, Tumor ; Cholinesterase Inhibitors/chemical synthesis ; Cholinesterase Inhibitors/chemistry ; Cholinesterase Inhibitors/pharmacology ; Donepezil/pharmacology ; Drug Screening Assays, Antitumor ; Humans ; Molecular Docking Simulation ; Piperazine/chemistry ; Spectrum Analysis/methods ; Structure-Activity Relationship
    Chemical Substances Benzothiazoles ; Cholinesterase Inhibitors ; Piperazine (1RTM4PAL0V) ; Donepezil (8SSC91326P) ; Acetylcholinesterase (EC 3.1.1.7) ; benzothiazole (G5BW2593EP)
    Language English
    Publishing date 2017-02-27
    Publishing country Netherlands
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2217610-X
    ISSN 1875-5992 ; 1871-5206
    ISSN (online) 1875-5992
    ISSN 1871-5206
    DOI 10.2174/1871520617666170412153604
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article: A novel form of recessive limb girdle muscular dystrophy with mental retardation and abnormal expression of alpha-dystroglycan.

    Dinçer, Pervin / Balci, Burcu / Yuva, Yeliz / Talim, Beril / Brockington, Martin / Dinçel, Deniz / Torelli, Silvia / Brown, Sue / Kale, Gülsev / Haliloglu, Göknur / Gerçeker, Filiz Ozbas / Atalay, Rengül Cetin / Yakicier, Cengiz / Longman, Cheryl / Muntoni, Francesco / Topaloglu, Haluk

    Neuromuscular disorders : NMD

    2004  Volume 13, Issue 10, Page(s) 771–778

    Abstract: The limb girdle muscular dystrophies are a heterogeneous group of conditions characterized by proximal muscle weakness and disease onset ranging from infancy to adulthood. We report here eight patients from seven unrelated families affected by a novel ... ...

    Abstract The limb girdle muscular dystrophies are a heterogeneous group of conditions characterized by proximal muscle weakness and disease onset ranging from infancy to adulthood. We report here eight patients from seven unrelated families affected by a novel and relatively mild form of autosomal recessive limb girdle muscular dystrophy (LGMD2) with onset in the first decade of life and characterized by severe mental retardation but normal brain imaging. Immunocytochemical studies revealed a significant selective reduction of alpha-dystroglycan expression in the muscle biopsies. Linkage analysis excluded known loci for both limb girdle muscular dystrophy and congenital muscular dystrophies in the consanguineous families. We consider that this represents a novel form of muscular dystrophy with associated brain involvement. The biochemical studies suggest that it may belong to the growing number of muscular dystrophies with abnormal expression of alpha-dystroglycan.
    MeSH term(s) Adolescent ; Adult ; Age of Onset ; Brain/metabolism ; Brain/pathology ; Brain/physiopathology ; Child ; Chromosome Mapping ; Cytoskeletal Proteins/biosynthesis ; Cytoskeletal Proteins/deficiency ; Cytoskeletal Proteins/genetics ; DNA Mutational Analysis ; Dystroglycans ; Female ; Genes, Recessive/genetics ; Genetic Testing ; Humans ; Immunohistochemistry ; Intellectual Disability/complications ; Intellectual Disability/genetics ; Intellectual Disability/metabolism ; Male ; Membrane Glycoproteins/biosynthesis ; Membrane Glycoproteins/deficiency ; Membrane Glycoproteins/genetics ; Microcephaly/genetics ; Microcephaly/pathology ; Muscle Proteins/metabolism ; Muscle, Skeletal/metabolism ; Muscle, Skeletal/pathology ; Muscle, Skeletal/physiopathology ; Muscular Dystrophies/complications ; Muscular Dystrophies/genetics ; Muscular Dystrophies/metabolism ; Turkey
    Chemical Substances Cytoskeletal Proteins ; DAG1 protein, human ; Membrane Glycoproteins ; Muscle Proteins ; Dystroglycans (146888-27-9)
    Language English
    Publishing date 2004-03-01
    Publishing country England
    Document type Case Reports ; Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1077681-3
    ISSN 1873-2364 ; 0960-8966
    ISSN (online) 1873-2364
    ISSN 0960-8966
    DOI 10.1016/s0960-8966(03)00161-5
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