Anna Lankoff

The Jan Kochanowski University in Kielce, Kel'tsy, Świętokrzyskie, Poland

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Publications (11)28.32 Total impact

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    ABSTRACT: Pseudomonas aeruginosa infection is problematic in patients with cystic fibrosis (CF). P. aeruginosa secretes a diversity of pigments, such as pyocyanin and pyoverdine. The aim of this study was to evaluate the effects of complexes of nickel(II) ([Ni(iaa)2(H2O)2]·H2O (iaa = imidazole-4-acetate anion), [Ni(1-allim)6](NO3)2 (1-allim = 1-allylimidazole) and NiCl2 on pyocyanin and pyoverdine production by 23 strains of P. aeruginosa isolated from cystic fibrosis under growth conditions specific for the CF respiratory system. The antibacterial effects and biophysical properties of the tested substances were measured by spectrofluorometric techniques, as well as by laser interferometry, confocal and atomic force microscopy. The cytotoxic properties of all compounds were measured by Annexin/IP assay against A549 cells. All tested compounds have no effect on pyocyanin production and decrease the pyoverdine secretion in about 40% of tested P. aeruginosa strains at non-cytotoxic range of concentrations. Imidazole-4-acetate anion and 1-allylimidazole have good diffusion properties in the mature P. aeruginosa PAO1 biofilm. In conclusion, the tested nickel(II) complexes do not have clinical implications in P. aeruginosa eradication in cystic fibrosis. The diffusion properties of 1-allylimidazole and imidazole-4-acetate and their lack of effect on A549 cells suggest that they might be considered for chemical synthesis with other transition metals.
    No preview · Article · Dec 2015 · Acta biochimica Polonica
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    ABSTRACT: The negative charge of LPS molecule and the presence of fatty acids in lipid A structure make it capable of binding with chitosan. In the presented work we analyzed the interactions of chitosan with LPS of Burkholderia cepacia or Proteus mirabilis and biological effects of these complexes on CHO-K1 cells. We observed that the presence of O-polysaccharide part of LPS (S1959), core region (R110) or lack of fatty acids in lipid A increased binding affinity of endotoxin with chitosan. However, lipid A of B. cepacia or P. mirabilis R45 might interact with CHO-K1 cells membrane alone or mediated by chitosan, respectively. In conclusion, the presence of two (B. cepacia) or one (P. mirabilis R45) Ara4N residues in lipid A part, promoted binding to cell membrane of CHO-K1 cells, alone or in the presence of chitosan, respectively. Chitosan reduced biological potencies of P. mirabilis lipid A R45 structure and this effect depended on the presence of O-PS. Lipid A of B. cepacia induced oxidative DNA damage in CHO-K1 cells.
    Full-text · Article · Sep 2013
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    ABSTRACT: Silver nanoparticles (AgNPs) are the most commonly used nanoparticles owing to their antimicrobial properties. The motivation of the present study was (1) to analyze the effect of silver particle size on rat tissue distribution at different time points, (2) to determine the accumulation of AgNPs in potential rat target organs, (3) to analyze the intracellular distribution of AgNPs and (4) to examine the excretion of AgNPs by urine and feces. AgNPs were characterized by dynamic light scattering (DLS), zeta potential measurements, BET surface area measurements, transmission and scanning electron microscopy. AgNPs (20 and 200 nm) were administered intravenously (i.v.) to male Wistar rats at a dose of 5 mg kg(-1) of body weight. Biological material was sampled 24 h, 7 and 28 days after injection. Using inductively coupled plasma-mass spectrometry (ICP-MS) and transmission electron microscopy (TEM) it was observed that AgNPs translocated from the blood to the main organs and the concentration of silver in tissues was significantly higher in rats treated with 20 nm AgNPs as compared with 200 nm AgNPs. The highest concentration of silver was found in the liver after 24 h. After 7 days, a high level of silver was observed in the lungs and spleen. The silver concentration in the kidneys and brain increased during the experiment and reached the highest concentration after 28 days. Moreover, the highest concentration of AgNPs was observed in the urine 1 day after the injection, maintained high for 14 days and then decreased. The fecal level of silver in rats was the highest within 2 days after AgNPs administration and then decreased. Copyright © 2012 John Wiley & Sons, Ltd.
    No preview · Article · Nov 2012 · Journal of Applied Toxicology
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    ABSTRACT: Among nanomaterials, silver nanoparticles (AgNPs) have the broadest and most commercial applications due to their antibacterial properties, highlighting the need for exploring their potential toxicity and underlying mechanisms of action. Our main aim was to investigate whether AgNPs exert toxicity by inducing oxidative damage to DNA in human kidney HEK 293 cells. In addition, we tested whether this damage could be counteracted by plant extracts containing phytochemicals such as swertiamarin, mangiferin and homoorientin with high antioxidant abilities. We show that AgNPs (20nm) are taken up by cells and localised in vacuoles and cytoplasm. Exposure to 1, 25 or 100 µg/ml AgNPs leads to a significant dose-dependent increase in oxidised DNA base lesions (8-oxo-7,8-dihydroguanine or 8-oxoG) detected by the comet assay after incubation of nucleoids with 8-oxoG DNA glycosylase. Oxidised DNA base lesions and strand breaks caused by AgNPs were diminished by aqueous and methanolic extracts from both haulm and flower of Gentiana asclepiadea.
    Full-text · Article · Sep 2012 · Mutagenesis
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    ABSTRACT: Abstract This study aims to assess the effects of Ag particles synthesised by a chemical (Ag 20, 200 nm) and biological method (Ag 23, 27 nm) in aquatic organisms: the bacterium Vibrio fischeri, the alga Desmodesmus subspicatus and the crustacean Daphnia magna. Ag particles exerted toxic effects in all organisms studied with Ag particles 23 nm being the most potent. Although soluble Ag was released in all media, the differences between the tested Ag particles still cannot be explained solely based on soluble Ag. NanoSIMS analysis performed with D. magna showed that apart from their localisation in the gut lumen, Ag 200 nm and Ag NPs 23 nm seemed to pass through the epithelial barrier as well. Ag NPs 23 nm localised in specific areas seemed to be within the ovaries. This study strengthens the argument that size, method of synthesis as well as surface chemistry may affect the uptake and toxic effects of Ag NPs.
    Full-text · Article · Jul 2012 · Nanotoxicology
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    ABSTRACT: Saponins are detergent-like substances showing antibacterial as well as anticancer potential. In this study, the effects of saponins from Quillaja saponaria were analyzed against prokaryotic and eukaryotic cells. Multidrug-resistant clinical E. coli strains were isolated from human urine. As eukaryotic cells, the CHO-K1 cell lines were applied. Antibacterial effect of ampicillin, streptomycin, and ciprofloxacin in the presence of saponins was measured by cultivation methods. Properties of saponins against CHO-K1 cells were measured by the MTT test, hemolysis assay and flow cytometry. Saponin from Quillaja saponaria has a cytotoxic effect at concentrations higher than 25 μg/mL and in the range of 12-50 μg/mL significantly increases the level of early apoptotic cells. Saponin at dose of 12 μg/mL enhances the six E. coli strains growth. We postulate that saponins increase the influx of nutrients from the medium into E. coli cells. Saponins do not have synergetic effects on antibacterial action of tested antibiotics. In contrary, in the presence of saponins and antibiotics, more CFU/mL E. coli cells were observed. This effect was similar to saponins action alone towards E. coli cells. In conclusion, saponins was cytotoxic against CHO-K1 cells, whereas against E. coli cells this effect was not observed.
    Full-text · Article · Feb 2012 · BioMed Research International
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    ABSTRACT: The rapid expansion of nanotechnology promises to have significant benefits to society, yet there is increasing concern that exposure to nanoparticles (particles typically <100 nm in size) will have negative impact on both human and environmental health. Due to its well-known bactericide properties, silver nanoparticles (AgNPs) are nowadays among the most commercialized nanomaterials, but surprisingly studies concerning toxicity at the cellular and molecular level are rather limited and the mechanisms that lay behind AgNPs toxicity are far from being understood. This critical review presents a detailed analysis of data on the in vitro and in vivo uptake, biodistribution, and toxicity of AgNPs. Emphasis is placed on the systematization of data over animal and cell models, organs examined, doses applied, the type of particle administration, and the time of examination.
    No preview · Chapter · Jun 2011

  • No preview · Article · Jul 2010 · Toxicology Letters
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    ABSTRACT: Neutropenia is the primary dose-limiting effect of etoposide toxicity resulting in a decreased efficiency of cancer treatment. Hence, the protection of neutrophils has important clinical implications. We investigated whether quercetin, due to its antioxidant properties, is able to modulate the damaging activity of etoposide. DNA damage, evaluated by the comet assay, and apoptosis, determined by FACScan flow cytometry using Annexin/PI, increased with etoposide doses. The intracellular level of reactive oxygen species (ROS) was enhanced in resting neutrophils incubated with etoposide at concentrations up to 25 microM; above this concentration etoposide revealed antioxidant properties. Only in latex-activated neutrophils, i.e. with latex-stimulated respiratory burst was the ROS production inhibited, as assessed by the luminol amplified chemiluminescence. The characteristic electron spin resonance (ESR) signal of etoposide phenoxyl radical, which occurs in the presence of myeloperoxidase, H2O2 and etoposide, was quenched by quercetin in a dose-dependent manner (0.1-0.5 microM). Quercetin also inhibited DNA damage induced by etoposide and enhanced the inhibitory action of etoposide on the ROS formation in neutrophils. However, quercetin (1 microM) lowered early and late apoptosis/necrosis only when apoptosis was induced by 25 microM etoposide; at higher etoposide concentration apoptosis was enhanced. Summing up, antioxidant adjuvant therapy using quercetin can be beneficial in prolonging neutrophils' lifespan in peripheral blood only when etoposide plasma concentration is low.
    No preview · Article · Oct 2007 · Toxicology in Vitro
  • Anna Lankoff · Adam Kolataj
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    ABSTRACT: The activity of cathepsins D and L, arginine aminopeptidase, dipeptidase II and dipeptidase IV was determined in the lysosomal, microsomal, cytoplasmatic fractions and in the complete homogenate of the mouse hepatocytes following injection of microcystin-YR and nodularin. The effect of both toxins depended on the time of action and on the fraction of cell cytoplasm. Microcystin-YR inhibited the synthesis of the studied proteases and caused a labialization of lysosomal membranes, whereas nodularin induced the synthesis of the enzymes and destabilized the reticulum endoplasmatic membranes.
    No preview · Article · Feb 2001 · Toxicon
  • Anna Lankoff · A Kolataj
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    ABSTRACT: Microcystine-YR (20 ug/kg bodyweight) and 8 ug/kg bodyweight of nodularin were intraperitoneally injected to 90 female Swiss mice. After 15, 30, 60 min and 24 h the changes were observed in the activity of some glucosidases in the complete cell homogenate and in the lysosomal, microsomal and cytosol fraction. Significant differences were connected with the time after administration of poison and with the cellular fraction. Nodularin induces the activity of beta-D-glucuronidase, alpha-glucosidase, lysosomal esterase and N-acetyl-glucosaminidase and influenced on the labilization of endoplasmatic reticulum membranes. Microcystine-YR inhibited the biosynthesis of glucosidases and revealed a destructive effect on membranes of lysosomes and endoplasmatic reticulum.
    No preview · Article · Jun 2000 · Toxicology

Publication Stats

166 Citations
28.32 Total Impact Points


  • 2011-2015
    • The Jan Kochanowski University in Kielce
      • Department of Radiobiology and Immunology
      Kel'tsy, Świętokrzyskie, Poland
  • 2010-2012
    • Instytut Chemii i Techniki Jądrowej
      • Centre for Radiobiology and Biological Dosimetry
      Warszawa, Masovian Voivodeship, Poland
  • 2007
    • Wszechnica Swietokrzyska
      Kel'tsy, Świętokrzyskie, Poland
  • 2000-2001
    • Pedagogical University of Cracow
      • Institute of Biology
      Cracovia, Lesser Poland Voivodeship, Poland