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Institute
- Biochemie und Chemie (1123) (remove)
In dieser Arbeit wurden Methoden entwickelt, mit denen das Auflösungsverhalten schwer wasserlöslicher schwacher Säuren verbessert werden kann. Als Modellwirkstoffe wurden drei Vertreter der Sulfonylharnstoff-Gruppe (Glibenclamid, Glipizid und Glimepirid) gewählt. Diese Wirkstoffe, werden zur oralen Standardtherapie des Typ 2 Diabetes eingesetzt. Die Ergebnisse aus den Löslichkeits- und Freisetzungsuntersuchungen der reinen Arzneistoffe bildeten in dieser Arbeit den Ausgangspunkt der Entwicklungsarbeit. Um den Einfluss der galenischen Methoden auf das Freisetzungsverhalten der entwickelten Formulierungen besser zu beurteilen, wurden ebenfalls entsprechende Handelspräparate (Euglucon N 3,5 mg, Luditec 5 mg und Amaryl 4 mg) untersucht. Zunächst wurden mit Glibenclamid und dem natürlichen ?-CD sowie verschieden Cyclodextrin-Derivaten (M-?-CD und HP-?-CD) binäre Komplexe im molaren Verhältnis von 1:2 (Glibenclamid:CD) hergestellt und charakterisiert. Anschließend wurden feste Lösungen aus Glibenclamid und Kollicoat(r) IR bzw. PVP K30 entwickelt. Bei den nachfolgenden Freisetzungsuntersuchungen zeichnete sich im Falle der binären Cyclodextrin-Komplexe ab, dass der Glibenclamid-HP-?-CD-Komplex das beste Freisetzungsverhalten von Glibenclamid in den untersuchten Medien erreichte. Bei den festen Lösungen von Glibenclamid gab es zwischen den beiden untersuchten Polymeren keine signifikanten Unterschiede im Ausmaß der Glibenclamidfreisetzung. Im nächsten Schritt wurden ternäre Komplexe (Glibenclamid-HP-?-CD-Polymer) entwickelt, eine Kombination aus binären CD- Komplexen und festen Lösungen. Als dritte Komponente wurden Kollicoat(r) IR, PVP K30 und PEG 6000 in unterschiedlichen Zusätzen, 5, 10 und 20% bezogen auf den zugrunde liegenden binären Glibenclamid-HP-?-CD-Komplex eingearbeitet. Die Charakterisierung der verschiedenen ternären Komplexe ergab, dass das beste Freisetzungsverhalten bei den Komplexen, welche einen 10%igen Kollicoat(r) IR- bzw. 20%igen PVP K30-Zusatz enthielten, generiert werden konnte. Bei den drei verwendeten Methoden (binäre-, ternäre Komplexe und feste Lösungen) erhielt man während der Freisetzungsuntersuchungen in den Medien mit einem pH-Wert unterhalb des pKs-Wertes von Glibenclamid (5,4) eine übersättigte Wirkstofflösung, was zum Teil innerhalb kürzester Zeit zum Präzipitieren des Wirkstoffes führte. Initiale DSC-Untersuchungen hatten gezeigt, dass Glibenclamid in den beschriebenen Präformulierungen in amorpher Form vorlag, was der Grund für die rasche Freisetzung war. Anschließend wurde versucht, das Präzipitieren zu verlangsamen und im besten Fall zu verhindern. Hierfür wurde HPMC in verschiedenen Formen verwendet. Das einfache Hinzumischen von HPMC in eine Gelatine-Kapsel zu der Glibenclamid-Formulierung führte aufgrund von Agglomeratbildungen zu einer deutlichen Verzögerung der Wirkstofffreisetzung. Pankreatin als Zusatz zum Freisetzungsmedium konnte die Bildung eines Agglomerates nicht verhindern, was darauf schließen ließ, dass dieses nicht durch sogenanntes "Cross-linking" der Gelatine entstanden war. In einem nächsten Schritt wurden HPMC-Kapseln eingesetzt. Die Glibenclamidfreisetzung konnte durch einfaches Austauschen der Gelatine-Kapseln gegen Vcaps(r) Plus-Kapseln in allen untersuchten Medien deutlich gesteigert werden, was auf die durch die Anwesenheit von HPMC verzögerte Präzipitation des Wirkstoffes im Freisetzungsmedium zurückzuführen war. Im nächsten Schritt wurde, die Formulierungsmethode von Glibenclamid, auf Glipizid übertragen. Es wurde analog zu Glibenclamid ein binärer Glipizid-HP-?-CD-Komplex im molaren Verhältnis von 1:2 (Glipizid:HP-?-CD) hergestellt. Dieser Komplex führte zu einer deutlichen Verbesserung des Auflösungsverhaltens von Glipizid, was zu einer annähernd 100%igen Wirkstofffreisetzung in allen untersuchten Medien führte. Weiterhin wurden die mit Glibenclamid entwickelten Methoden auch auf Glimepirid übertragen. Die Formulierung von Glimepirid zu einem binären Glimepirid-HP-?-CD-Komplex führte zu einer höheren Wirkstofffreisetzung, verglichen mit der kristallinen Reinsubstanz und des Handelspräparates. Durch die Verarbeitung von Glimepirid in ternären Komplexen erhöhte sich das Ausmaß der Wirkstofffreisetzung deutlich. Mit Kollicoat(r) IR konnte eine Wirkstofffreisetzung von ca. 60% der Dosis und mit PVP K30 als dritter Komponente sogar ca. 85% Wirkstofffreisetzung in Blank FeSSIF erzielt werden. Das Präzipitieren des Wirkstoffes nach initialer Wirkstofffreisetzung in Blank FeSSIF konnte durch den Einsatz von Vcaps(r) Plus-Kapseln deutlich reduziert werden. Stabilitätsuntersuchungen, welche mit den in dieser Arbeit verwendeten Präformulierungen durchgeführt wurden zeigten, dass der jeweilige Wirkstoff auch nach einem Jahr der Lagerung bei Raumtemperatur und < 30% rel. Luftfeuchte, in amorpher Form in den entsprechenden Präformulierungen vorlag. All diese Untersuchungen zeigten eindrucksvoll, dass sich Cyclodextrin-Derivate in Kombination mit hydrophilen Polymeren, dazu eigneten, die Verfügbarkeit schwer löslicher Wirkstoffe im Dünndarm für deren Resorption zu verbessern. Es wurde gezeigt, dass die Herstellungsmethodik der Cyclodextrin-Komplexe einen wesentlichen Einfluss auf die Wirkstofffreisetzung hatte.
Die Synthese des Coenzymmodells Flavin-benzimidazol-dinucleotid * gelang durch Kondensation von Benzimidazolribotid-imidazolid 1 oder Benzimidazolribotid-guanidiniumamidat 2 mit Flavinmononucleotid. Das Coenzymmodell war enzymatisch nicht aktiv und bildete keinen Enzym-Coenzym-Komplex. Im Absorptionsspektrum konnte eine Extinktionszunahme nach der Spaltung der Pyrophosphatbrücke nur im Bereich von 260 mμ beobachtet werden. Das Molekül liegt daher vermutlich in einer gefalteten Form vor. Ein Komplex zwischen Flavin- und Benzimidazolteil konnte nicht nachgewiesen werden. Eine Fluoreszenzunterdrückung, die im FAD durch die Komplexbildung zwischen Flavin- und Adeninteil bedingt wird, wurde im FBD-Coenzymmodell nicht beobachtet.
Zomot, Elia ; Yardeni, Eliane Hadas ; Vargiu, Attilio Vittorio ; Tam, Heng Keat ; Malloci, Giuliano ; Ramaswamy, Venkata Krishnan ; Perach, Michal ; Ruggerone, Paolo ; Pos, Klaas Martinus ; Bibi, Eitan
Secondary multidrug (Mdr) transporters utilize ion concentration gradients to actively remove antibiotics and other toxic compounds from cells. The model Mdr transporter MdfA from Escherichia coli exchanges dissimilar drugs for protons. The transporter should open at the cytoplasmic side to enable access of drugs into the Mdr recognition pocket. Here we show that the cytoplasmic rim around the Mdr recognition pocket represents a previously overlooked important regulatory determinant in MdfA. We demonstrate that increasing the positive charge of the electrically asymmetric rim dramatically inhibits MdfA activity and sometimes even leads to influx of planar, positively charged compounds, resulting in drug sensitivity. Our results suggest that unlike the mutants with the electrically modified rim, the membrane-embedded wild-type MdfA exhibits a significant probability of an inward-closed conformation, which is further increased by drug binding. Since MdfA binds drugs from its inward-facing environment, these results are intriguing and raise the possibility that the transporter has a sensitive, drug-induced conformational switch, which favors an inward-closed state.
A metal–organic framework (MOF) material, [Zn2(adc)2(dabco)] (adc = anthracene-9,10-dicarboxylate, dabco = 1,4-diazabicyclo[2.2.2]octane), the fluorescence of which depends on the loading of its nanopores, was synthesized in two forms: as free-flowing nanocrystals with different shapes and as surface-attached MOFs (SURMOFs). For the latter, we used self-assembled monolayers (SAMs) bearing functional groups, such as carboxylate and pyridyl groups, capable of coordinating to the constituents of the MOF. It could be demonstrated that this directed coordination also orients the nanocrystals deposited at the surface. Using two different patterning methods, i.e., microcontact printing and electron-beam lithography, the lateral distribution of the functional groups could be determined in such a way that the highly localized deposition of the SURMOF films became possible.
Metallorganische Netzwerke (engl. metal-organic frameworks, MOFs) sind eine neuartige Klasse mikro/mesoporöser Materialien, für die eine Vielzahl von möglichen Anwendungen demonstriert werden konnte. Das Ziel dieser Arbeit besteht in der Synthese von MOF Mikro/Nanopartikeln sowie der Herstellung von sogenannten Oberflächen-deponierten MOFs (engl. surface-attached metal-organic frameworks, SURMOFs). MOF Partikel mit kontrollierbarer Morphologie und Größe wurden unter milden Bedingungen synthetisiert. Um MOFs als Sensoren, intelligente Membrane, oder in nanotechnologischen Bauelementen verwenden zu können, ist die Integration auf der jeweiligen Oberfläche wichtig. Daher beschäftigt sich der Großteil dieser Arbeit mit der kontrollierten Abscheidung von SURMOFs auf verschiedenartigen Trägermaterialien. Etliche interessante Eigenschaften (z.B. die Fluoreszenz in Abhängigkeit von der Gegenwart von Gastmolekülen und die dynamische Gasadsorptionskapazität) der SURMOFs wurden untersucht.
The Na+/proline transporter of E. Coli (PutP) is responsible for the uptake of proline which is subsequently used not only as a carbon and nitrogen source and a constituent of proteins but also as a particularly effective osmoprotectant. However, for a long time there was little known about the single steps in the reaction cycle of this transporter and only few details about its structure-function relationship are available. Aim of the present work was to achieve a deeper understanding about the kinetic properties of the Na+/proline transporter and to get insights into the structure-function relationship of the substrate binding. To answer these questions different techniques were used. By using the novel SSM technique combining the preparation of PutP proteoliposomes it was possible to demonstrate for the first time the electrogenic substrate binding to PutP transporter. Due to rapid solution exchange measurements on the SSM it was additionally possible to obtain time resolved information about the kinetic details of the cytoplasmic substrate binding sites which were not available by previous steady state and equilibrium binding measurements. Pre-steady-state charge translocation was observed after rapid addition of one or both of the cosubstrates Na+ and/or proline to the PutP-WT proteoliposomes adsorbed on the SSM. Thereby it was possible to link the observed electrical signals with the binding activity of PutP. The observed Na+ and/or proline induced charge displacement were assigned to an electrogenic Na+ and/or proline binding process at the cytoplasmic face of the enzyme with a rate constant of k > 50 s-1 proceeding the rate limiting step of the reaction cycle. Furthermore, based on the kinetic analysis of the electrical signals obtained from the measurements of PutP on SSM, the following characteristics of the substrates binding in PutP were deduced: (1) both Na+ and proline can bind individually to the transporter. Under physiological conditions, an ordered binding mechanism prevails; while at sufficiently high concentrations, each substrate can bind in the absence of the other; (2) substrate binding is electrogenic not only for Na+, but also for the uncharged cosubstrate proline. The charge displacement associated with Na+ binding and proline binding is of comparable size and independent of the presence of the respective cosubstrate. In addition, it was concluded that Na+ accesses its binding site through a high-field access channel resulting in a charge translocation, whereas the binding of the electroneutral proline induces a conformation alteration involving the displacement of charged amino acid residue(s) of the protein; (3) Na+ and proline binding sites interact cooperatively with each other by increasing the affinity and/or the speed of binding of the respective cosubstrate; (4) proline binding proceeds in a two step process: low affinity (~ 0.9 mM) electroneutral substrate binding followed by a nearly irreversible electrogenic conformational transition; (5) membrane impermeable PCMBS inhibits both Na+ and proline binding to the inside-out orientated PutP transporter, indicating that rather than selectively blocking a specific binding site, PCMBS probably locks the enzyme in an inactive state. The possible targets for this SH-reagent are cysteines 281 and 344 located close to the cytoplasmic surface of the protein. Beyond it, transient electrical currents of PutP were also observed on the BLM after rapid addition of proline in the presence of Na+. This was possible by combining the conventional BLM technique with high-speed flash-photolysis of caged-proline. Indeed the signals on the BLM indicate the detection of a different underlying reaction process in comparison to the data achieved by the SSM technique. This has paved the way for supplemental information about the reaction cycle since it was possible to assign the flash-photolysis BLM signals to the proline binding step followed by the internalization of Na+ and proline into the liposome. Thereby it was found, that the presence of Na+ is indispensable and the time constant for the process is ~ 63 ms. Moreover, structure-function information about the Na+ and proline binding sites of PutP was obtained by investigating the functionally important amino acid residues Asp55, Gly63 and Asp187 with site-directed mutagenesis and the combined SSM technique. One finding is that the mutated proteins PutP-D55C and PutP-G63C showed no activity on the SSM. Therefore, it can be assumed that either both Asp55 and Gly63 are crucial for the structure of PutP protein, or they are located at or close to the Na+ and proline binding sites. Furthermore, the results obtained from PutP-D187N and PutP-D187C mutants on SSM suggest that Asp187 of PutP is likely to be involved in the Na+ binding at the cytoplasmic side of the backward running carrier. Taken together the results of the present work have substantially broadened the known picture of the Na+/proline transporter PutP thereby several steps of the reaction cycle were elucidated, and moreover, valuable insights into the structure-function relationship of the transporter have become available.
Der Schwerpunkt der vorliegenden Arbeit lag in der Synthese und strukturellen Charakterisierung von sandwichartig aufgebauten kupferhaltigen Organosiloxanen. Diese sollten nach Möglichkeit kristalline Eigenschaften aufweisen und ein interessantes magnetisches Verhalten zeigen. Es galt, die Beziehungen zwischen molekularer Struktur und magnetischen Eigenschaften herauszuarbeiten, um auf der Basis experimenteller Daten dem maßgeschneiderten Design neuer molekularer Magnete näher zu kommen. .... Die in der hier vorgelegten Arbeit erzielten Ergebnisse belegen, dass der Weg zur gezielten Erzeugung molekularer Magnete erfolgreich beschritten wurde. Es wird weiteren Arbeiten vorbehalten bleiben, Cluster der nun vorliegenden Art chemisch so zu verknüpfen, dass daraus polymere Ketten oder Netzwerke entstehen. Deren magnetisches Verhalten lässt erwarten, dass damit möglicherweise neue Materialien zugänglich werden, die dem Anspruch eines molekularen Magneten voll gerecht werden.
Unlimited self-renewal is an absolute prerequisite for any malignancy, and is the ultimate arbiter of the continuous growth and metastasis of tumors. It has been suggested that the self-renewal properties of a tumor are exclusively contained within a small population, i.e., the so-called cancer stem cells. Enhanced self-renewal potential plays a pivotal role in the development of leukemia. My data have shown that APL associated translocation products PML/RARalpha and PLZF/RARalpha increased the replating efficiency of mouse lin-/Sca1+ hematopoietic stem cells (HSCs). This effect is partly mediated by induction of gamma–catenin which is an important mediator of the Wnt signaling pathway and has been shown to be up regulated by the AML associated translocation products(AATPs). Suppression of gamma–catenin by siRNA can abrogate the increased replating efficiency induced by AATPs. Transduction of gamma–catenin in lin-/Sca1+ HSCs led to increased replating efficiency and the expression of stem cell markers Sca1 and c-kit. Additionally it induced accelerated cell cycle progression of mouse bone marrow HSCs. Transduction/transplantation mouse models have shown that ectopic expression of gamma–catenin in HSCs led to acute myeloid leukemia without maturation. These data suggest important roles of Wnt signaling pathway in the leukemogenesis induced by PML/RARalpha, PLZF/RARalpha and AML1/ETO. In contrast to AATPs, CML and Ph+-ALL associated translocation products p185(BCR-ABL) and p210(BCR-ABL) did not affect the self-renewal potential of hematopoietic stem/progenitor cells. However my studies indicated that their reciprocal translocation products p40(ABL/BCR) and p96(ABL/BCR) actually increased the replating efficiency of hematopoietic stem/progenitor cells. The effect is stronger when induced by p96(ABL/BCR) than by p40(ABL/BCR). It is very intriguing that p96(ABL/BCR) can activate Wnt signaling and up regulate the expression of HoxB4. Transduction/transplantation mouse model has shown that p40(ABL/BCR) and p96(ABL/BCR) both have their own leukemogenic potential. Given the fact that leukemic stem cells maintain the growth of tumor and are the origin of relapse, the cure of leukemia is dependent on the eradication of the leukemic stem cell and abrogation of aberrantly regulated self-renewal capability. Both t-RA and As2O3 have been shown to induce complete remission in APL patients with PML/RARalpha translocation product. However, t-RA as a single agent achieves completeremission (CR) but not complete molecular remissions (CMR). Therefore, virtually all patients will experience a relapse within a few months. In contrast to t-RA, As2O3 as a single agent is able to induce CR as well as CMR followed by long-term relapse-free survival in about 50% of APL patients even if relapsed after treatment with t-RA-containing chemotherapy regimens. Nothing is known about the mechanisms leading to the complete different clinical outcomes by the two compounds although both have been shown to induce differentiation of blast cells, proliferation arrest, induction of apoptosis and degradation of PML/RARalpha. We investigated the effect of t-RA and arsenic on PML/RARalpha-expressing cell population with stem cell capacity derived from the APL cell line NB4 as well as Sca1+/lin- murine bone marrow cells. We found that t-RA did not reduce the replating efficiency in PML/RARalpha- and PLZF/RARalpha-infected Sca1+/lincells whereas it selected small compact colonies representing very early progenitor cells. T-RA was unable to reduce the capacity to form colony forming units-spleen (CFU-S) of Sca1+/lin-cells expressing PML/RARalpha, additionally t-RA did not impair the capability of engraftment of NB4 cells in NOD/SCID mouse. On the contrary to t-RA, As2O3 abolished the aberrant self-renewal potential of Sca1+/lin- cells expressing PML/RARalpha. As2O3 not only abolished the replating efficiency of PML/RARalpha positive cells but also completely abrogated the ability of PML/RARalpha-positive HSC to produce CFU-S in vivo. On the contrary to As2O3, t-RA increased the absolute cell number and the percentage of cells in the side population with respect to the whole cell population in NB4 cells. Taken together these data suggest that arsenic but not all-trans retinoic acid overcomes the aberrant stem cell capacity of PML/RARalpha positive leukemic stem cells. My data prove for the first time that there is a direct relationship between the capacity of compounds to effectively target the LSC and their capacity to eradicate the leukemia, and, thereby, to induce complete molecular remission and long-term relapse-free survival. Thus, in order to increase the curative potential of leukemia therapies, future studies need to include the effect of given compounds on the stem cell compartment to determine their ability to eradicate the LSC.
The title compound, C16H14N4, features an aromatic ring with two 2,2´-dicyanopropyl residues in positions 1 and 3, which are located above and below the ring plane. The two residues differ in their conformation with respect to the aromatic ring: whereas one of the Cmethyl-C-Cmethylene-Caromatic torsion angles is gauche [68.93 (12)°], the other one is fully staggered [177.63 (9)°]. The crystal structure is stabilized by C-H...N hydrogen-bonding interactions. Key indicators: single-crystal X-ray study; T = 173 K; mean σ(C–C) = 0.002 Å; R factor = 0.037; wR factor = 0.101; data-to-parameter ratio = 15.0.