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[Topography of the metabolic cycle of 4-aminobutyrate].

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This work describes, with some detail the intervention of 4-aminobutyrate as protagonist of a derivation of tricarboxylic cycle. Its vicarial mission is emphasized in connection with its existence in microorganisms (Escherichia coli and Pseudomonas fluorescens), plants (Helianthus tuberosus. Lupinus

Molecular dynamics simulations and experimental studies of binding and mobility of 7-tert-butyldimethylsilyl-10-hydroxycamptothecin and its 20(S)-4-aminobutyrate ester in DMPC membranes.

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The enhanced permeability and retention of liposomes in solid tumors makes liposomal formulations attractive for the targeting of various antitumor agents. This study explores the binding, orientation, and dynamic properties of a potent topoisomerase I inhibitor,

Tuning the hydrolytic aqueous chemistry of osmium arene complexes with N,O-chelating ligands to achieve cancer cell cytotoxicity.

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Potential biological and medical applications of organometallic complexes are hampered by a lack of knowledge of their aqueous solution chemistry. We show that the hydrolytic and aqueous solution chemistry of half-sandwich OsII arene complexes of the type [(eta6-arene)Os(XY)Cl] can be tuned with XY

Comparison of Effects of Diet on Mammary Cancer: Efficacy of Various Preventive Agents and Metabolomic Changes of Different Diets and Agents.

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To determine the effects of diet, rats were placed on a standard diet (4% fat) or on a modified Western (high-fat diet, HFD) diet (21% fat) at 43 days of age (DOA) and administered methylnitrosourea (MNU) at 50 DOA. Rats were administered effective (tamoxifen, vorozole, and Targretin) or ineffective

Effects of carboplatin on amino acid chemistry in chinchilla cochlear nucleus.

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Carboplatin, a drug widely used against solid head and neck tumors, selectively destroys cochlear inner hair cells and type I auditory nerve fibers in chinchilla. This should affect neurotransmitter chemistry, involving amino acids, where the type I auditory nerve fibers terminate in the cochlear

In vivo metabolic profiling of glioma-initiating cells using proton magnetic resonance spectroscopy at 14.1 Tesla.

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In the last decade, evidence has emerged indicating that the growth of a vast majority of tumors including gliomas is sustained by a subpopulation of cancer cells with stem cell properties called cancer initiating cells. These cells are able to initiate and propagate tumors and constitute only a

Cochlear ablation effects on amino acid levels in the chinchilla cochlear nucleus.

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Inner ear damage can lead to hearing disorders, including tinnitus, hyperacusis, and hearing loss. We measured the effects of severe inner ear damage, produced by cochlear ablation, on the levels and distributions of amino acids in the first brain center of the auditory system, the cochlear nucleus.

Expression and purification of human gamma-glutamylcysteine synthetase.

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gamma-Glutamylcysteine synthetase (gamma-GCS) catalyzes the ATP-dependent ligation of L-glutamate and L-cysteine to form L-gamma-glutamyl-L-cysteine; this is the first and rate-limiting step in glutathione biosynthesis. Inhibitors of gamma-GCS such as buthionine sulfoximine are widely used as tools

Dose responsive effects of cisplatin in L02 cells using NMR-based metabolomics.

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Cisplatin is an effective chemotherapeutic agent for the treatment of various cancers, such as bladder cancer, epithelial ovarian cancer, cervical cancer, and so on. However, cisplatin can cause various side effects. In this study, the dose-responsive effects of cisplatin were investigated in an in

In vivo evaluation of 99mTc/188Re-labeled linear alpha-melanocyte stimulating hormone analogs for specific melanoma targeting.

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Radiolabeled alpha-melanocyte stimulating hormone (alpha-MSH) analogs were examined in melanoma-bearing mice to determine the effects of peptide length, structure, and radiometal chelation chemistry on tumor targeting and in vivo biodistribution. The linear alpha-MSH analogs [Nle4,D-Phe7]alpha-MSH

GABARBP down-regulates HIF-1α expression through the VEGFR-2 and PI3K/mTOR/4E-BP1 pathways.

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Human γ-aminobutyrate type A (GABAA) receptor-binding protein (GABARBP), a tumor suppressor protein with apoptotic function, can be inhibited in response to angiogenesis through the PI3K/Akt signaling cascades. Here, we investigated whether GABARBP over-expression could regulate vascular endothelial

The plant GABA signaling downregulates horizontal transfer of the Agrobacterium tumefaciens virulence plasmid.

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In the tumor-inducing (Ti) Agrobacterium tumefaciens, quorum sensing activates the horizontal transfer of the virulent Ti plasmid. In pure culture, this process can be impaired by the A. tumefaciens BlcC lactonase, whose expression is induced by gamma-aminobutyrate (GABA). It was therefore

Synthesis, characterization, in vivo antitumor properties of the cluster rhenium compound with GABA ligands and its synergism with cisplatin.

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A new dirhenium(III) complex cis-[Re2(GABA)2Cl5(H2O)]Cl.2H2O with zwitterionic gamma-aminobutyrate ligands was prepared and characterized by spectral methods and crystallography. The structure of the compound is comprised of dinuclear complex cations (Re-Re 2.2437(3) A) involving cis-oriented double

Amino acid concentrations in chinchilla cochlear nucleus at different times after carboplatin treatment.

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Amino acid concentrations were measured in the cochlear nucleus for a group of 20 chinchillas: four each of control and 4, 8, 29, and 85 days after treatment with the ototoxic anti-tumor drug carboplatin (100 mg/kg, i.p.). The treated chinchillas showed various extents of inner hair cell loss,

Regulation of N-carbamoyl-beta-alanine amidohydrolase, the terminal enzyme in pyrimidine catabolism, by ligand-induced change in polymerization.

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N-Carbamoyl-beta-alanine (NC beta A) amidohydrolase (EC 3.5.1.6) is regulated in opposing fashion by the substrate, NC beta A and the product, beta-alanine. The native enzyme from rat liver has a molecular weight of 235,000 in the absence of ligands. NC beta A and substrate analogs

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