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polyamine/carie dentaire
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Polyamines of dental plaque in caries-resistant vs. caries-susceptible adults.
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Utilizing a sensitive liquid chromatographic system, polyamines were quantitated in three-day plaque from 13 caries-resistant (CR) and 35 caries-susceptible (CS) adults after they had fasted for 12 hours. The values for putrescine and cadaverine were significantly higher in the CR group. This may be
Polyamine metabolism in carcinoma of the oral cavity compared with adjacent and normal oral mucosa.
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In this study, polyamine biosynthesis required for cellular proliferation showed elevated levels in neoplastic cells. Putrescine, spermidine, and spermine, as well as the rate-limiting enzyme ornithine decarboxylase, were measured to evaluate differences in tissue concentration in squamous cell
[Polyamines in tumors of the oral cavity].
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The polyamines putrescine, spermidine and spermine are essential for normal growth and differentiation and the activity of the enzymes participating in their synthesis and catabolism are markedly modified in actively proliferating cells in vitro and in vivo. In some neoplastic cells a good
Integrated analyses utilizing metabolomics and transcriptomics reveal perturbation of the polyamine pathway in oral cavity squamous cell carcinoma.
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Oral cavity squamous cell carcinoma (OSCC), the most common malignancy of the oral cavity, is associated with poor prognosis and high mortality worldwide. Moreover, knowledge of the metabolic alterations that occur in OSCC is still limited. In the present study, we used a quantitative metabolomic
Free and acetylated polyamines as markers of oral cavity tumors.
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Differences in tissue concentrations of N1- and N8-acetylspermidine and cadaverine in squamous cell carcinoma of the oral cavity compared to the surrounding healthy tissue, as well as to epulides and other benign oral lesions (papillomas, lipomas, and fibromas) are assessed. The results indicate
K+ binding in the G-loop and water cavity facilitates Ba2+ movement in the Kir2.1 channel.
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K+ are selectively coordinated in the selectivity filter and concerted K+ and water movements in this region ensure high conduction rates in K+ channels. In channels with long pores many K+ binding sites are located intracellular to the selectivity filter (inner vestibule), but their contribution to
Protonation and Zn(II) coordination by dipyridine-containing macrocycles with different molecular architecture. A case of pH-controlled metal jumping outside-inside the macrocyclic cavity.
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The synthesis of the macrocyclic ligand 4,4'-(2,5,8,11,14-pentaaza[15])-2,2'-bipyridylophane (L3), which contains a pentaamine chain linking the 4,4'-positions of a 2,2'-dipyridine moiety, is reported. Protonation and Zn(II) complexation by L3 and by macrocycle L2, containing the same pentaamine
[Cytochemical analysis of polyamines in Ehrlich ascitic carcinoma cells during different phases of mitotic cycle under the effects of difluoromethylornithine].
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Mice bearing Ehrlich carcinoma cells received one 80 mg/kg dose of DFMO. After 20 hours the cells were extracted from the peritoneal cavity and separated by means of sedimentation of 1 g in saccharose gradient into 9 fractions depending on the mitotic cycle phase. The content of polyamines in the
Onchocerca volvulus: immunohistochemical and immunoelectron microscopical distribution of a polyamine oxidizing enzyme.
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We studied the distribution of a polyamine oxidizing enzyme (PAO) in Onchocerca volvulus and other nematode parasites by immunohistochemistry and electron microscopy with immunogold technique using a polyclonal antiserum raised against purified PAO from Ascaris suum. In adult O. volvulus the protein
One-Pot Fabrication of Pd Nanoparticles@COF-derived Hollow Polyamine spheres as a Synergistic Catalyst for Tandem Catalysis.
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Facile fabrication of nanocatalysts consisting of metal nanoparticles (NPs) anchored on functional supporter is highly desirable, yet remains challenging. Covalent organic frameworks (COFs) provide an emerging materials platform for structural control and functional design. Here, we demonstrate a
Intercalation of Zn(II) and Cu(II) complexes of the cyclic polyamine Neotrien into DNA: equilibria and kinetics.
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The equilibria and kinetics of the interaction of the Zn(II) and Cu(II) complexes of the macrocyclic polyamine 2,5,8,11-tetraaza[12]-[12](2,9)[1,10]-phenanthrolinophane (Neotrien) with calf thymus DNA have been investigated at pH=7.0 and T=25 degrees C by spectrophotometry, spectrofluorimetry and
Active site geometry of a novel aminopropyltransferase for biosynthesis of hyperthermophile-specific branched-chain polyamine.
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Branched-chain polyamines are found exclusively in thermophilic bacteria and Euryarchaeota and play essential roles in survival at high temperatures. In the present study, kinetic analyses of a branched-chain polyamine synthase from the hyperthermophilic archaeon Thermococcus kodakarensis (Tk-BpsA)
Host-guest inclusion system of rhein with polyamine-modified β-cyclodextrins: characterization and cytotoxicity.
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We report the preparation of inclusion complexes between rhein and four polyamine-modified β-cyclodextrins, namely amino-β-cyclodextrins (NH2-βCD), ethylenediamine-β-cyclodextrins (EN-βCD), diethylenetriamine-β-cyclodextrins (DETA-βCD) and triethylenetetramine-β-cyclodextrins (TETA-βCD) using
Resembling breast milk: influence of polyamine-supplemented formula on neonatal BALB/cOlaHsd mouse microbiota.
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Infant microbiota is influenced by numerous factors, such as delivery mode, environment, prematurity and diet (breast milk or formula). In addition to its nutritional value, breast milk contains bioactive substances that drive microbial colonisation and support immune system development, which are
Molecular basis of inward rectification: structural features of the blocker defined by extended polyamine analogs.
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Polyamines cause inward rectification of Kir K(+) channels by blocking deep within the channel pore. We investigated structural constraints of polyamine block of strongly rectifying mutant K(ATP) channels (Kir6.2[L164C,N160D,C166S] + SUR1). We studied three groups of polyamine analogs: 1)
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