Monolacunary Wells-Dawson Polyoxometalate as a Novel Contrast Agent for Computed Tomography: A Comprehensive Study on In Vivo Toxicity and Biodistribution.

Polyoxotungstate nanoclusters have recently emerged as promising contrast agents for computed tomography (CT). In order to evaluate their clinical potential, in this study, we evaluated the in vitro CT imaging properties, potential toxic effects in vivo, and tissue distribution of monolacunary Wells-Dawson polyoxometalate, α-KPWO20HO (mono-WD POM). Mono-WD POM showed superior X-ray attenuation compared to other tungsten-containing nanoclusters (its parent WD-POM and Keggin POM) and the standard iodine-based contrast agent (iohexol).

In vivo toxicity evaluation of a polyoxotungstate nanocluster as a promising contrast agent for computed tomography.

In this study, we demonstrate for the first time, that a discrete metal-oxo cluster α-/β-KPWO (WD-POM) exhibits superior performance as a computed tomography (CT) contrast agent, in comparison to the standard contrast agent iohexol. A toxicity evaluation of WD-POM was performed according to standard toxicological protocols using Wistar albino rats. The maximum tolerable dose (MTD) of 2000 mg/kg was initially determined after oral WD-POM application.

Comparative Evaluation of [F]5-Fluoroaminosuberic Acid and (4)-4-3-[F]fluoropropyl)-l-Glutamate as System xC--Targeting Radiopharmaceuticals.

System [Formula: see text] is an appealing biomarker for targeting oxidative stress with oncologic PET imaging and can serve as an alternative PET biomarker to other metabolic indicators. In this paper, we report a direct comparison of 2 F-labeled amino acid radiopharmaceuticals targeting system [Formula: see text], [F]5-fluoroaminosuberic acid ([F]FASu) and (4)-4-(3-[F]fluoropropyl)-l-glutamate ([F]FSPG), in terms of their uptake specificity and ability to image glioma and lung cancer xenografts in vivo. Both tracers were synthesized according to previously published procedures.

The simultaneous action of acute paradoxical sleep deprivation and hypothyroidism modulates synaptosomal ATPases and acetylcholinesterase activities in rat brain.

Background: Thyroid dysfunctions as well as sleep abnormalities are usually followed by neurological, psychiatric and/or behavioral disorders. On the other hand, changes in the brain adenosine triphosphatases (ATPases) and acetylcholinesterase (AChE) activities show significant importance in pathogenetic pathways in the evolution of numerous neuropsychiatric diseases.

Methods: This study aimed to evaluate the in vivo simultaneous effects of hypothyroidism and paradoxical sleep deprivation for 72 h on synaptosomalATPases and AChE activities of whole rat brains.

Selected polyoxopalladates as promising and selective antitumor drug candidates.

Polyoxo-noble-metalates (PONMs), a class of molecular noble metal-oxo nanoclusters that combine features of both polyoxometalates and noble metals, are a promising platform for the development of next-generation antitumor metallodrugs. This study aimed to evaluate the antitumor potential against human neuroblastoma cells (SH-SY5Y), as well as toxicity towards healthy human peripheral blood cells (HPBCs), of five polyoxopalladates(II): (Na[PdAsO(OH)]·42HO (Pd), Na[SrPdO(OH)(PhAsO)(OAc)]·2NaOAc·32HO (SrPd), Na[Pd(AsPh)O]·23HO (PdL), Na[SnOPd(PO)]·43HO (SnPd), and Na[PbOPd(PO)]·38HO (PbPd)), as the largest subset of PONMs. A pure inorganic, Pd, was found as the most potent and selective antineuroblastoma agent with IC values (µM) of 7.