FMP Publications

Our publications are recorded in a searchable database since 2010, updates will be added regularly.

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References
A Small-Molecule Antagonist of the beta-Catenin/TCF4 Interaction Blocks the Self-Renewal of Cancer Stem Cells and Suppresses Tumorigenesis
Fang(*), L., Zhu(*), Q., Neuenschwander, M., Specker, E., Wulf-Goldenberg(*), A., Weis(*), W. I., von Kries, J. P.; Birchmeier(*), W.
Cancer research, 76:891-901
(2016)

Tags: Screening Unit (von Kries)

Abstract: Wnt/beta-catenin signaling is a highly conserved pathway essential for embryogenesis and tissue homeostasis. However, deregulation of this pathway can initiate and promote human malignancies, especially of the colon and head and neck. Therefore, Wnt/beta-catenin signaling represents an attractive target for cancer therapy. We performed high-throughput screening using AlphaScreen and ELISA techniques to identify small molecules that disrupt the critical interaction between beta-catenin and the transcription factor TCF4 required for signal transduction. We found that compound LF3, a 4-thioureido-benzenesulfonamide derivative, robustly inhibited this interaction. Biochemical assays revealed clues that the core structure of LF3 was essential for inhibition. LF3 inhibited Wnt/beta-catenin signals in cells with exogenous reporters and in colon cancer cells with endogenously high Wnt activity. LF3 also suppressed features of cancer cells related to Wnt signaling, including high cell motility, cell-cycle progression, and the overexpression of Wnt target genes. However, LF3 did not cause cell death or interfere with cadherin-mediated cell-cell adhesion. Remarkably, the self-renewal capacity of cancer stem cells was blocked by LF3 in concentration-dependent manners, as examined by sphere formation of colon and head and neck cancer stem cells under nonadherent conditions. Finally, LF3 reduced tumor growth and induced differentiation in a mouse xenograft model of colon cancer. Collectively, our results strongly suggest that LF3 is a specific inhibitor of canonical Wnt signaling with anticancer activity that warrants further development for preclinical and clinical studies as a novel cancer therapy.

Chemical fragment arrays for rapid druggability assessment
Aretz(*), J., Kondoh(*), Y., Honda(*), K., Anumala, U. R., Nazare, M., Watanabe(*), N., Osada(*), H.; Rademacher(*), C.
Chem Commun (Camb), 52:9067-9070
(2016)

Tags: Medicinal Chemistry (Nazare)

Abstract: Incorporation of early druggability assessment in the drug discovery process provides a means to prioritize target proteins for high-throughput screening. We present chemical fragment arrays as a method that is capable of determining the druggability of a given target with low protein and compound consumption, enabling rapid decision making during early phases of drug discovery.

Organophosphorus-mediated N-N bond formation: facile access to 3-amino-2H-indazoles
Bel Abed, H., Schöne, J., Christmann(*), M.; Nazare, M.
Org Biomol Chem, 14:8520-8528
(2016)

Tags: Medicinal Chemistry (Nazare)

Abstract: A convenient and efficient strategy has been devised to access 3-amino-2H-indazole derivatives in two steps from readily available starting materials. The conversion of 2-nitrobenzonitriles to substituted benzamidines followed by an organophosphorus-mediated reductive cyclization and a subsequent N-N bond formation afforded 3-amino-2H-indazoles in good to excellent yields.

Temperature dependence of cross-effect dynamic nuclear polarization in rotating solids: advantages of elevated temperatures
Geiger, M. A., Orwick-Rydmark, M., Marker, K., Franks, W. T., Akhmetzyanov(*), D., Stöppler, D., Zinke, M., Specker, E., Nazare, M., Diehl, A., van Rossum, B. J., Aussenac(*), F., Prisner(*), T., Akbey, Ü.; Oschkinat, H.
Phys Chem Chem Phys, 18:30696-30704
(2016)

Tags: NMR-Supported Structural Biology (Oschkinat), Medicinal Chemistry (Nazare), Molecular Biophysics (Lange, A.)

Abstract: Dynamic nuclear polarization exploits electron spin polarization to boost signal-to-noise in magic-angle-spinning (MAS) NMR, creating new opportunities in materials science, structural biology, and metabolomics studies. Since protein NMR spectra recorded under DNP conditions can show improved spectral resolution at 180-200 K compared to 110 K, we investigate the effects of AMUPol and various deuterated TOTAPOL isotopologues on sensitivity and spectral resolution at these temperatures, using proline and reproducibly prepared SH3 domain samples. The TOTAPOL deuteration pattern is optimized for protein DNP MAS NMR, and signal-to-noise per unit time measurements demonstrate the high value of TOTAPOL isotopologues for Protein DNP MAS NMR at 180-200 K. The combined effects of enhancement, depolarization, and proton longitudinal relaxation are surprisingly sample-specific. At 200 K, DNP on SH3 domain standard samples yields a 15-fold increase in signal-to-noise over a sample without radicals. 2D and 3D NCACX/NCOCX spectra were recorded at 200 K within 1 and 13 hours, respectively. Decreasing enhancements with increasing 2H-content at the CH2 sites of the TEMPO rings in CD3-TOTAPOL highlight the importance of protons in a sphere of 4-6 A around the nitroxyl group, presumably for polarization pickup from electron spins.

Modulation of Hexadecyl-LPA-Mediated Activation of Mast Cells and Microglia by a Chemical Probe for LPA5
Kozian(*), D. H., von Haeften(*), E., Joho(*), S., Czechtizky(*), W., Anumala, U. R., Roux(*), P., Dudda(*), A., Evers(*), A.; Nazare, M.
Chembiochem, 17:861-865
(2016)

Tags: Medicinal Chemistry (Nazare)

Abstract: Mast cells and microglia play a critical role in innate immunity and inflammation and can be activated by a wide range of endogenous and exogenous stimuli. Lysophosphatidic acid (LPA) has recently been reported to activate mast cells and microglia. Using the human mast cell line HMC-1 and the mouse microglia cell line BV-2, we show that LPA-mediated activation can be prevented by blockade of the LPA receptor 5 (LPA5) in both cell lines. The identification of new LPA5-specific antagonists as tool compounds to probe and modulate the LPA5/LPA axis in relevant in vitro and in vivo assays should contribute to better understanding of the underlying role of LPAs in the development and progression of (neuro-) inflammatory diseases.

5-Aryl-2-(naphtha-1-yl)sulfonamido-thiazol-4(5H)-ones as clathrin inhibitors
Robertson(*), M. J., Horatscheck, A., Sauer, S., von Kleist(*), L., Baker, J. R., Stahlschmidt, W., Nazare, M., Whiting(*), A., Chau(*), N., Robinson(*), P. J., Haucke, V.; McCluskey(*), A.
Org Biomol Chem, 14:11266-11278
(2016)

Tags: Molecular Pharmacology and Cell Biology (Haucke), Medicinal Chemistry (Nazare)

Abstract: The development of a (Z)-5-((6,8-dichloro-4-oxo-4H-chromen-3-yl)methylene)-2-thioxothiazolidin-4-one (2), rhodanine-based lead that led to the Pitstop(R) 2 family of clathrin inhibitors is described herein. Head group substitution and bioisosteric replacement of the rhodanine core with a 2-aminothiazol-4(5H)-one scaffold eliminated off target dynamin activity. A series of N-substituents gave first phenylglycine (20, IC50 approximately 20 muM) then phenyl (25, IC50 approximately 7.1 muM) and 1-napthyl sulfonamide (26, Pitstop(R) 2 compound, IC50 approximately 1.9 muM) analogues with good activity, validating this approach. A final library exploring the head group resulted in three analogues displaying either slight improvements or comparable activity (33, 38, and 29 with IC50 approximately 1.4, 1.6 and 1.8 muM respectively) and nine others with IC50 < 10 muM. These results were rationalized using in silico docking studies. Docking studies predicted enhanced Pitstop(R) 2 family binding, not a loss of binding, within the Pistop(R) groove of the reported clathrin mutant invalidating recent assumptions of poor selectivity for this family of clathrin inhibitors.

Effects of Halide Ions on the Carbamidocyclophane Biosynthesis in Nostoc sp. CAVN2
Preisitsch(*), M., Heiden(*), S. E., Beerbaum, M., Niedermeyer(*), T. H., Schneefeld(*), M., Herrmann(*), J., Kumpfmüller(*), J., Thürmer(*), A., Neidhardt(*), I., Wiesner(*), C., Daniel(*), R., Müller(*), R., Bange(*), F. C., Schmieder, P., Schweder(*), T.; Mundt(*), S.
Mar Drugs, 14:21
(2016)

Tags: Solution NMR (Schmieder)

Abstract: In this study, the influence of halide ions on [7.7]paracyclophane biosynthesis in the cyanobacterium Nostoc sp. CAVN2 was investigated. In contrast to KI and KF, supplementation of the culture medium with KCl or KBr resulted not only in an increase of growth but also in an up-regulation of carbamidocyclophane production. LC-MS analysis indicated the presence of chlorinated, brominated, but also non-halogenated derivatives. In addition to 22 known cylindrocyclophanes and carbamidocyclophanes, 27 putative congeners have been detected. Nine compounds, carbamidocyclophanes M-U, were isolated, and their structural elucidation by 1D and 2D NMR experiments in combination with HRMS and ECD analysis revealed that they are brominated analogues of chlorinated carbamidocyclophanes. Quantification of the carbamidocyclophanes showed that chloride is the preferably utilized halide, but incorporation is reduced in the presence of bromide. Evaluation of the antibacterial activity of 30 [7.7]paracyclophanes and related derivatives against selected pathogenic Gram-positive and Gram-negative bacteria exhibited remarkable effects especially against methicillin- and vancomycin-resistant staphylococci and Mycobacterium tuberculosis. For deeper insights into the mechanisms of biosynthesis, the carbamidocyclophane biosynthetic gene cluster in Nostoc sp. CAVN2 was studied. The gene putatively coding for the carbamoyltransferase has been identified. Based on bioinformatic analyses, a possible biosynthetic assembly is discussed.

Stabilization of bacterially expressed erythropoietin by single site-specific introduction of short branched PEG chains at naturally occurring glycosylation sites
Hoffmann(*), E., Streichert, K., Nischan, N., Seitz(*), C., Brunner(*), T., Schwagerus, S., Hackenberger, C. P.; Rubini(*), M.
Mol Biosyst, 12:1750-1755
(2016)

Tags: Chemische Biologie II (Hackenberger)

Abstract: The covalent attachment of polyethylene glycol (PEG) to therapeutic proteins can improve their physicochemical properties. In this work we utilized the non-natural amino acid p-azidophenylalanine (pAzF) in combination with the chemoselective Staudinger-phosphite reaction to install branched PEG chains to recombinant unglycosylated erythropoietin (EPO) at each single naturally occurring glycosylation site. PEGylation with two short 750 or 2000 Da PEG units at positions 24, 38, or 83 significantly decreased unspecific aggregation and proteolytic degradation while biological activity in vitro was preserved or even increased in comparison to full-glycosylated EPO. This site-specific bioconjugation approach permits to analyse the impact of PEGylation at single positions. These results represent an important step towards the engineering of site-specifically modified EPO variants from bacterial expression with increased therapeutic efficacy.

Bis(arylmethyl)-substituted unsymmetrical phosphites for the synthesis of lipidated peptides via Staudinger-phosphite reactions
Nischan, N., Kasper, M. A., Mathew(*), T.; Hackenberger, C. P.
Org Biomol Chem, 14:7500-7508
(2016)

Tags: Chemical Biology II (Hackenberger)

Abstract: With this study we introduce new unsymmetrical phosphites to obtain lipidated peptide-conjugates starting from easily accessible azide-modified amino acid or peptide precursors. For this purpose, we investigated which substituents at alkyl phosphites lead to the highest formation of mono-alkylated phosphoramidate peptides. We found that phosphites containing one alkyl-chain and two picolyl or benzyl-substituents delivered alkyl phosphoramidate-conjugates in high yields, which also allowed a chemoselective lipidation of an unprotected azido polypeptide. Finally, monolipidated phosphoramidate peptides obtained by the unsymmetrical Staudinger phosphite reaction led to the formation of micelle-like structures and cellular uptake.

Lipopeptide-based micellar and liposomal carriers: Influence of surface charge and particle size on cellular uptake into blood brain barrier cells
Sydow, K., Nikolenko, H., Lorenz, D., Müller(*), R. H.; Dathe, M.
Eur J Pharm Biopharm, 109:130-139
(2016)

Tags: Peptide-Lipid-Interaction/ Peptide Transport (Dathe)

Abstract: Lipopeptide-based micelles and liposomes were found to differ in cell recognition and uptake mode into blood brain barrier (BBB) endothelial cells. Here we analyse the role of size and surface charge of micelles and liposomes composed of different lipopeptide sequences with respect to uptake into human brain capillary (HBMEC) and aortic (HAoEC) endothelial cells. Comparable to the dipalmitoylated apolipoprotein E-derived P2A2, lipopeptides of cationic poly-arginine (P2Rn), poly-lysine (P2Kn) and an anionic glutamic-acid sequence (P2En) self assemble into micelles (12-14nm in diameter) with high surface charge density, and bind to small (SUVs, about 24nm in diameter) and large (LUV, about 100nm in diameter) liposomes at variable lipid to peptide ratios. The interaction pattern of the resulting particles with endothelial cells is highly variable as revealed by confocal laser scanning microscopic (CLSM) and fluorescence assisted cell sorting (FACS) studies. Micelles and SUVs with high P2A2 density are efficiently and selectively internalized into HBMEC. P2Kn micelles strongly accumulate in both the cytosol and at the cell membrane, while the interaction of liposomes tagged with a low amount of P2A2 and P2Kn with the cells was reduced. Anionic micelles seem to dissociate in the presence of cells and P2En molecules incorporate into the cellular membrane whereas the negatively charged liposomes hardly interact with cells. Surprisingly, all poly-R-based particles show high selectivity for HBMEC compared to HAoEC, independent of particle size and peptide surface density. The P2Rn-mediated internalization is highly efficient and partially clathrin-dependent. The oligo-R lipopeptide is considered to be most promising to selectively transport different drug carriers into the blood brain barrier.

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Leibniz-Forschungsinstitut für Molekulare Pharmakologie im Forschungsverbund Berlin e.V. (FMP)
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