The field of heteropolymetallic complexes is of current interest in connection with the structures and roles of polymetallic active sites in biological systems [1], and the design of new molecular materials with magnetic, optical and electrical properties [2,3]. Among various relevant systems, oxamido-bridged polynuclear complexes [2,4] and phenolato-oxygen-bridged macrocyclic complexes [5,6] r...

AbstractSolidago canadensis L. cv. ʽTaraʼ as important flower production and traditional medicine. Heavy metals such lead (Pb) have harmful effects on ornamental plants. So, this study aimed to reduce the toxic effect of Pb Solidago plant through spermine(SPM) application. Plants were grown in treated soils with different levels (0, 400, 800 ppm) sprayed spermine at 0, 1 2 mM. Plant height, lea...

Polyamines were examined in several yeasts and filamentous fungi. Whereas putrescine, spermidine, and spermine were present in the yeasts, spermine was not detected in any of the filamentous fungi.

The objective of this study is to prepare a non-viral carrier of gene transfection from various polysaccharides and evaluate the feasibility in gene expression for mesenchymal stem cells (MSCs). Various amounts of spermine were chemically introduced into pullulan, dextran and mannan with a molecular weight of around 40 000 or pullulan with different molecular weights to prepare cationized polys...

Modeling the binding sites for spermine and ifenprodil on the regulatory (R) domains of the N-methyl-D-aspartate receptor GluN1 and GluN2B subunits was carried out after measuring spermine stimulation and ifenprodil inhibition at receptors containing GluN1 and GluN2B R domain mutants. Models were constructed based on the published crystal structure of the GluN1 and GluN2B R domains, which form ...

It has been confirmed that multidrug resistant (MDR) melanoma cells (M14 ADR2) are more sensitive than their wild-type counterparts (M14 WT) to H2O2 and aldehydes, the products of bovine serum amine oxidase (BSAO)-catalyzed oxidation of spermine. The metabolites formed by BSAO and spermine are more toxic, in M14 cells, than exogenous H2O2 and acrolein, even though their concentration is lower d...

Inward rectification in strong inward rectifiers such as Kir2.1 is attributed to voltage-dependent block by intracellular polyamines and Mg(2+). Block by the polyamine spermine has a complex voltage dependence with shallow and steep components and complex concentration dependence. To understand the mechanism, we measured macroscopic Kir2.1 currents in excised inside-out giant patches from Xenop...

Polyamines are important endogenous regulators of ion channels and are known to modulate inflammation and nociception. Here we investigated effects of polyamines on the capsaicin receptor TRPV1, a major ion channel expressed in nociceptive sensory afferents. Extracellular spermine, spermidine, and putrescine directly activated TRPV1 in a charge-dependent manner, both in heterologous expression ...

The role of putrescine, spermidine and spermine in phorbol 12-myristate-13-acetate (PMA)-induced macrophage differentiation was examined in human HL-60 and U-937 myeloid leukemia cells. Unlike other polyamines, spermine affected this differentiation by acting as a negative regulator. This negative regulation was established by showing that the PMA-induced macrophage phenotype, but not PMA-assoc...