FMP Publications

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

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References
N-[6-(4-butanoyl-5-methyl-1H-pyrazol-1-yl)pyridazin-3-yl]-5-chloro-1-[2-(4-methyl piperazin-1-yl)-2-oxoethyl]-1H-indole-3-carboxamide (SAR216471), a novel intravenous and oral, reversible, and directly acting P2Y12 antagonist
Boldron(*), C., Besse(*), A., Bordes(*), M. F., Tissandie(*), S., Yvon(*), X., Gau(*), B., Badorc(*), A., Rousseaux(*), T., Barre(*), G., Meneyrol(*), J., Zech(*), G., Nazare, M., Fossey(*), V., Pflieger(*), A. M., Bonnet-Lignon(*), S., Millet(*), L., Briot(*), C., Dol(*), F., Herault(*), J. P., Savi(*), P., Lassalle(*), G., Delesque(*), N., Herbert(*), J. M.; Bono(*), F.
Journal of medicinal chemistry, 57:7293-7316
(2014)

Tags: Medicinal Chemistry (Nazare)

Abstract: In the search of a potential backup for clopidogrel, we have initiated a HTS campaign designed to identify novel reversible P2Y12 antagonists. Starting from a hit with low micromolar binding activity, we report here the main steps of the optimization process leading to the identification of the preclinical candidate SAR216471. It is a potent, highly selective, and reversible P2Y12 receptor antagonist and by far the most potent inhibitor of ADP-induced platelet aggregation among the P2Y12 antagonists described in the literature. SAR216471 displays potent in vivo antiplatelet and antithrombotic activities and has the potential to differentiate from other antiplatelet agents.

Development of 1,8-naphthalimides as clathrin inhibitors
MacGregor(*), K. A., Robertson(*), M. J., Young(*), K. A., von Kleist(*), L., Stahlschmidt, W., Whiting(*), A., Chau(*), N., Robinson(*), P. J., Haucke, V.; McCluskey(*), A.
Journal of medicinal chemistry, 57:131-143
(2014)

Tags: Molecular Pharmacology and Cell Biology (Haucke)

Abstract: We reported the first small molecule inhibitors of the interaction between the clathrin N-terminal domain (TD) and endocyctic accessory proteins (i.e., clathrin inhibition1). Initial screening of a approximately 17 000 small molecule ChemBioNet library identified 1. Screening of an existing in-house propriety library identified four substituted 1,8-napthalimides as approximately 80-120 muM clathrin inhibitors. Focused library development gave 3-sulfo-N-(4-aminobenzyl)-1,8-naphthalimide, potassium salt (18, IC50 approximately 18 muM). A second library targeting the 4-aminobenzyl moiety was developed, and four analogues displayed comparable activity (26, 27, 28, 34 with IC50 values of 22, 16, 15, and 15 muM respectively) with a further four (24, 25, 32, 33) more active than 18 with IC50 values of 10, 6.9, 12, and 10 muM, respectively. Docking studies rationalized the structure-activity relationship (SAR) with the biological data. 3-Sulfo-N-benzyl-1,8-naphthalimide, potassium salt (25) with an IC50 approximately 6.9 muM, is the most potent clathrin terminal domain-amphiphysin inhibitor reported to date.

Interferon-gamma safeguards blood-brain barrier during experimental autoimmune encephalomyelitis
Ni(*), C., Wang(*), C., Zhang(*), J., Qu(*), L., Liu(*), X., Lu(*), Y., Yang(*), W., Deng(*), J., Lorenz, D., Gao(*), P., Meng(*), Q., Yan(*), X., Blasig, I. E.; Qin(*), Z.
The American journal of pathology, 184:3308-3320
(2014)

Tags: Molecular Cell Physiology (Blasig, I.E.), Cellular Imaging (Wiesner)

Abstract: The function of blood-brain barrier is often disrupted during the progression of multiple sclerosis and its animal model, experimental autoimmune encephalomyelitis (EAE). However, the molecular mechanism of blood-brain barrier modulation during neuroinflammation remains unclear. Herein, we show that the expression of interferon-gamma (IFNgamma) receptor on endothelial cells (ECs) protected mice from the brain inflammation during EAE. IFNgamma stabilized the integrity of the cerebral endothelium and prevented the infiltration of leukocytes into the brain. Further analysis revealed that IFNgamma increased the expression of tight junction proteins zonula occludens protein 1 and occludin, as well as membranous distribution of claudin-5, in brain ECs. Silencing claudin-5 abolished the IFNgamma-mediated improvement of EC integrity. Taken together, our results show that IFNgamma, a pleiotropic proinflammatory cytokine, stabilizes blood-brain barrier integrity and, therefore, prevents brain inflammation during EAE.

Safety, efficacy, and molecular mechanism of claudin-1-specific peptides to enhance blood-nerve-barrier permeability
Sauer(*), R. S., Krug(*), S. M., Hackel(*), D., Staat, C., Konasin(*), N., Yang(*), S., Niedermirtl(*), B., Bosten(*), J., Günther, R., Dabrowski, S., Doppler(*), K., Sommer(*), C., Blasig, I. E., Brack(*), A.; Rittner(*), H. L.
J Control Release, 185:88-98
(2014)

Tags: Molecular Cell Physiology (Blasig, I.E.)

Abstract: The blood-nerve barrier consists of the perineurium and endoneurial vessels. The perineurial barrier is composed of a basal membrane and a layer of perineurial cells sealed by tight junction proteins preventing e.g. application of analgesics for selective regional pain control. One of the barrier-sealing proteins in the blood-nerve barrier is claudin-1. Therefore, the claudin-1-peptidomimetics (C1C2), derived from the first extracellular loop (ECL1) on claudin-1 was developed. In this study, we further evaluated the expression of tight junction proteins in the perineurium in Wistar rats and characterized the specificity, in vivo applicability, mechanism of action as well as the biocompatibility of C1C2. In the perineurium, claudin-19, tricellulin and ZO-1, but no claudin-2, 3, 8 and -11 were expressed. C1C2 specifically bound to the ECL1 of claudin-1 and fluorescent 5,6-carboxytetramethylrhodamine-C1C2 was rapidly internalized. Opening the perineurium with C1C2 reduced the mRNA and protein expression of claudin-1 and increased small and macromolecule permeability into the peripheral nerve. Application of C1C2 facilitated regional analgesia using mu-opioid receptor agonists like DAMGO or morphine without motor impairment in naive rats as well as rats with hind paw inflammation. In contrast the control peptide C2C2 derived from ECL1 on claudin-2 did neither open the barrier nor facilitated opioid-mediated regional analgesia. C1C2 delivery was well tolerated and caused no morphological and functional nerve damage. C1C2 effects could be reversed by interference with the wnt-signal-transduction pathway, specifically the homeobox transcription factor cdx2, using a glycogen-synthase-kinase-3 inhibitor. In summary, we describe the composition of and a pathway to open the perineurial barrier employing a peptide to deliver hydrophilic substances to the peripheral nerve.

Active and silent chromophore isoforms for phytochrome Pr photoisomerization: An alternative evolutionary strategy to optimize photoreaction quantum yields
Yang, Y., Linke, M., von Haimberger, T., Matute, R., Gonzalez, L., Schmieder, P.; Heyne, K.
Structural dynamics (Melville, N.Y.), 1:014701
(2014)

Tags: Solution NMR (Schmieder)

Abstract: Photoisomerization of a protein bound chromophore is the basis of light sensing of many photoreceptors. We tracked Z-to-E photoisomerization of Cph1 phytochrome chromophore PCB in the Pr form in real-time. Two different phycocyanobilin (PCB) ground state geometries with different ring D orientations have been identified. The pre-twisted and hydrogen bonded PCB(a) geometry exhibits a time constant of 30 ps and a quantum yield of photoproduct formation of 29%, about six times slower and ten times higher than that for the non-hydrogen bonded PCB(b) geometry. This new mechanism of pre-twisting the chromophore by protein-cofactor interaction optimizes yields of slow photoreactions and provides a scaffold for photoreceptor engineering.

Structure of a C. perfringens enterotoxin mutant in complex with a modified Claudin-2 extracellular loop 2
Yelland(*), T. S., Naylor(*), C. E., Bagoban(*), T., Savva(*), C. G., Moss(*), D. S., McClane(*), B. A., Blasig, I. E., Popoff(*), M.; Basak(*), A. K.
J Mol Biol, 426:3134-3147
(2014)

Tags: Molecular Cell Physiology (Blasig, I.E.)

Abstract: CPE (Clostridium perfringens enterotoxin) is the major virulence determinant for C. perfringens type-A food poisoning, the second most common bacterial food-borne illness in the UK and USA. After binding to its receptors, which include particular human claudins, the toxin forms pores in the cell membrane. The mature pore apparently contains a hexamer of CPE, claudin and, possibly, occludin. The combination of high binding specificity with cytotoxicity has resulted in CPE being investigated, with some success, as a targeted cytotoxic agent for oncotherapy. In this paper, we present the X-ray crystallographic structure of CPE in complex with a peptide derived from extracellular loop 2 of a modified, CPE-binding Claudin-2, together with high-resolution native and pore-formation mutant structures. Our structure provides the first atomic-resolution data on any part of a claudin molecule and reveals that claudin's CPE-binding fingerprint (NPLVP) is in a tight turn conformation and binds, as expected, in CPE's C-terminal claudin-binding groove. The leucine and valine residues insert into the binding groove while the first residue, asparagine, tethers the peptide via an interaction with CPE's aspartate 225 and the two prolines are required to maintain the tight turn conformation. Understanding the structural basis of the contribution these residues make to binding will aid in engineering CPE to target tumor cells.

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Leibniz-Forschungsinstitut für Molekulare Pharmakologie im Forschungsverbund Berlin e.V. (FMP)
Campus Berlin-Buch
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13125 Berlin, Germany
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info(at)fmp-berlin.de

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