The neisserial fbpABC locus has been proposed to act as an iron-specific ABC transporter system. To confirm this assigned function, we constructed an fbpABC mutant in Neisseria meningitidis by insertional inactivation of fbpABC with a selectable antibiotic marker. The mutant was unable to use iron supplied from human transferrin, human lactoferrin, or iron chelates. However, the use of iron fro...

The effects of ADP, ATP, citrate and EDTA on iron-dependent microsomal and liposomal lipid peroxidation, and on 59FeCl3 binding to the lipid membranes were measured. The aim was to test if initiation of lipid peroxidation is a site-specific mechanism requiring bound iron. In the absence of chelator, iron was bound to both membranes. EDTA and citrate removed the iron and inhibited peroxidation. ...

Abstract Iron plays a significant role in the metabolism of cancer cells. In comparison with normal cells, neoplastic ones exhibit enhanced vulnerability to iron. Ferric ions target tumor via ferroptotic death pathway—a process involving iron-mediated lipid oxidation. ion occurs complex forms physiological conditions. Apart from iron, ligands are other factors affect biological activity iron co...

Administration of ambilhar or its N-acetyl derivative to rabbits resulted in a significant increase in urinary iron excretion, due to chelation. Substitution of the sulphur of thiazole by nitrogen abolished its metal chelating power. In vitro three different iron chelates were obtained, containing one or two iron atoms per mole of drug. However, in vivo studies revealed the presence of an ambil...

Administration of niridazole to rats poisoned with copper caused a significant increase in both the urinary and biliary excretion of the metal. Although the urinary excretion of iron was increased by the drug, iron excretion was significantly decreased during the drug-induced excretion of copper after copper poisoning. Formation of a copper-niridazole chelate or chelates before excretion in the...

Interaction between apo-transferrin and several iron(III) chelates has been investigated in terms of the capillary electrophoresis method. Based on the results, it has been clarified that (i) a binuclear iron(III) unit with an oxo-bridge is necessary for the facile transfer of an iron atom from the iron(III) chelate to apo-transferrin, and (ii) the renal proximal tubular injuries by Fe(III)-nit...

A prospective multi-centric study was conducted to determine if iron-chelating agent deferiprone also chelates zinc. Twenty four-hour urinary zinc levels were compared in multiply transfused children with thalassemia major not receiving any chelation therapy (Group A, n = 28), those receiving deferiprone (Group B, n = 30) and age and sex-matched controls of subjects in Group B (Group C, n = 29)...

Introduction: MR contrast agents (CAs) are important elements for cellular MRI. Gadolinium (Gd) chelates are used in T1-weighted production of positive signal contrast while superparamagnetic iron oxide particles (SPIOs) produce T2-weighted signal reduction. Although SPIOs provide more sensitivity toward cell labeling compared to Gd-chelates, the negative contrast generated by the SPIOs may be ...

Chelates can inhibit the iron- and copper-catalyzed autoxidation of ascorbate at pH 7.0. Diethylenetriaminepentaacetic acid (DTPA or DETAPAC) and Desferal (deferoximane mesylate) slow the iron-catalyzed oxidation of ascorbate as effectively as reducing the trace levels of contaminating iron in buffers with Chelex resin. DETAPAC, EDTA and HEDTA (N-(2-hydroxyethyl)-ethylenediaminetriacetic acid) ...