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    Wyświetlanie 1-6 z 6
    Tytuł:
    Bactericidal effect of photodynamic therapy against methicillin-resistant Staphylococcus aureus strain with the use of various porphyrin photosensitizers
    Autorzy:
    Grinholc, Mariusz
    Szramka, Bozena
    Olender, Katarzyna
    Graczyk, Alfreda
    Powiązania:
    https://bibliotekanauki.pl/articles/1041060.pdf
    Data publikacji:
    2007
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    photosensitizer
    porphyrin
    photodynamic therapy
    MRSA
    Opis:
    Photodynamic therapy (PDT) is based on photosensitizers activated by light of appropriate wavelength. Their activation leads to generation of singlet oxygen and free radicals responsible for the cytotoxic effect. The aim of this project was to compare the bactericidal effect of PDT using different porphyrin photosensitizers against a methicillin-resistant Staphylococcus aureus strain. Exogenous sensitizers (protoporphyrin IX and newly synthesized derivative, protoporphyrin diarginate) induced a 3 log10-unit reduction in bacterial viable counts. With the use of endogenous, ALA-induced porphyrins, a 1.6 log10-unit reduction was obtained. The sensitizers tested executed their antibacterial activity with no essential change in the antibiotic resistance pattern of the studied strain.
    Źródło:
    Acta Biochimica Polonica; 2007, 54, 3; 665-670
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Photodynamic effect of protoporphyrin diarginate (PPArg2) on methicillin-resistant Staphylococcus aureus and human dermal fibroblasts
    Autorzy:
    Grinholc, Mariusz
    Kawiak, Anna
    Kurlenda, Julianna
    Graczyk, Alfreda
    Bielawski, Krzysztof
    Powiązania:
    https://bibliotekanauki.pl/articles/1040819.pdf
    Data publikacji:
    2008
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    cytotoxicity
    antimicrobial photodynamic inactivation
    MRSA
    fibroblasts
    phototoxicity
    Opis:
    The worldwide rise in the antibiotic resistance of bacteria forces the development of alternative antimicrobial treatments. A potential approach is photodynamic inactivation (PDI). The aim of the present study was to determine the phototoxicity of protoporphyrin diarginate (PPArg2) against methicillin-resistant Staphylococcus aureus and human dermal fibroblasts. Different concentrations (0 to 20 µM) of PPArg2 and light dose of 6 J cm-2 were tested. Cell viability was evaluated using the methylthiazoletetrazolium (MTT) assay. Incubation with 10 µM followed by illumination yielded a 3.6 log10-unit reduction in the viable count for Staphylococcus aureus. At the same experimental conditions, only 22.5% of the fibroblasts were photoinactivated. Protoporphyrin diarginate at concentrations up to 20 µM demonstrated no toxicity towards S. aureus or fibroblasts when not irradiated. These results suggest that the protoporphyrin diarginate exerts a high bactericidal effect against methicillin-resistant S. aureus strain without harming eukaryotic cells.
    Źródło:
    Acta Biochimica Polonica; 2008, 55, 1; 85-90
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cytotoxicity of PP(Arg)2- and Hp(Arg)2-mediated photodynamic therapy and early stage of apoptosis induction in prostate carcinoma in vitro
    Autorzy:
    Nowak-Stępniowska, Agata
    Wiktorska, Katarzyna
    Małecki, Maciej
    Romiszewska, Anna
    Padzik-Graczyk, Alfreda
    Powiązania:
    https://bibliotekanauki.pl/articles/1039837.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    confocal microscopy
    PDT
    prostate carcinoma
    Opis:
    Porphyrin photosensitizers tend to localize in mitochondria. The depolarization of mitochondrial membrane is one of the early stages of apoptosis and Laser Scanning Fluorescence Microscopy allows to determine changes in transmembrane mitochondrial potential under influence of PDT depending on the kind of photosensitizer (PP(Arg)2, Hp(Arg)2), the energy dose (5, 10, 30 and 50 J/cm2) and time periods (24 and 48 hours after irradiation) in the LNCaP (lymphonodal metastasis of prostate carcinoma, the androgen dependent cell line). Cyototoxicity induced by PP(Arg)2- and Hp(Arg)2-based PDT depending on energy dose and time after irradiation in prostate carcinoma is determined with MTT. Generally, it was shown that lower energy doses induce greater changes in transmembrane mitochondrial potential. Hp(Arg)2-based PDT was more effective causing greater mitochondrial membrane depolarization and cell viability decrease in comparison to PP(Arg)2-mediated PDT (in the case of maximal nontoxic photosensitizer doses used).
    Źródło:
    Acta Biochimica Polonica; 2011, 58, 4; 497-505
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cytotoxicity of PP(Arg)2- and PP(Ala)2(Arg)2-based photodynamic therapy and early stage of apoptosis induction in human breast cancers in vitro
    Autorzy:
    Nowak-Stępniowska, Agata
    Wiktorska, Katarzyna
    Małecki, Maciej
    Milczarek, Małgorzata
    Lubelska, Katarzyna
    Padzik-Graczyk, Alfreda
    Powiązania:
    https://bibliotekanauki.pl/articles/1039664.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    photodynamic therapy
    breast cancer
    transmembrane mitochondrial potential
    Opis:
    Mitochondria are cell energetic centers where ATP is produced. They also play a very important role in the PDT as intracellular sites of photosensitizer localization. Photosensitizers gathering in mitochondria (like porphyrin derivatives used in this work) are more effective in tumor cell destruction. Moreover, it was assumed that di-amino acid substituents attached to porphyrin ring will strengthen the effectivity of interaction with membrane receptors of examined cells. MTT assay was performed to investigate the influence of PP(Arg)2 and PP(Ala)2(Arg)2-based PDT on breast cancer cell viability for 24 h, 48 h and 120 h after cell irradiation. Then the influence of PP(Ala)2(Arg)2- and PP(Arg)2-mediated PDT on early mitochondrial apoptosis induction via measurements of the transmembrane mitochondrial potential changes was examined. Results showed that lower energy doses and maximal nontoxic photosensitizer doses of PP(Ala)2(Arg)2 and PP(Arg)2 applied in PDT can imply apoptotic cell death. It was confirmed that modification of the protoporphyrin IX by attaching two alanine substituents raised the efficiency of photodynamic therapy.
    Źródło:
    Acta Biochimica Polonica; 2012, 59, 4; 603-611
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of electrophoretic methods for detection of protein-porphyrin complexes.
    Autorzy:
    Kowalska, Agnieszka
    Kwiek, Piotr
    Miłosz, Ewa
    Gondek, Grzegorz
    Romiszewska, Anna
    Graczyk, Alfreda
    Podhajska, Anna
    Powiązania:
    https://bibliotekanauki.pl/articles/1043407.pdf
    Data publikacji:
    2003
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    porphyrins
    photodynamic therapy
    PDT
    electrophoresis
    Opis:
    Simple methods for detection and isolation of protein-porphyrin complexes were elaborated in our laboratory. They are based on the separation of protein-porphyrin complexes in native polyacrylamide gel and measurement of their fluorescence, with the use of two detection systems: the commercially available Gel DocTM 2000 system, and a system specially designed for the purpose of these investigations, concerning protein-porphyrin interactions. The fluorescent complexes can be electro-transferred from the gel onto PVDF membrane, eluted and analyzed in order to identify the protein interacting with porphyrins.
    Źródło:
    Acta Biochimica Polonica; 2003, 50, 4; 1155-1163
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bioelements in hair of children with selected neurological disorders
    Autorzy:
    Józefczuk, Jan
    Kasprzycka, Wiktoria
    Czarnecki, Rafał
    Graczyk, Alfreda
    Józefczuk, Paweł
    Krzysztof, Magda
    Lampart, Urszula
    Mrozowska-Ząbek, Ewa
    Surdy, Weronika
    Kwiatkowska-Graczyk, Róża
    Powiązania:
    https://bibliotekanauki.pl/articles/1038647.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    bioelements
    epilepsy
    Down's syndrome
    cerebral palsy
    hair
    children
    Opis:
    We have analyzed concentrations of magnesium (Mg), calcium (Ca), copper (Cu), zinc (Zn) and iron (Fe) in hair of a group of 82 children with mental retardation, in which 9 patients suffered from epilepsy, 18 from the Down's syndrome and 55 from cerebral palsy. Girls comprised little over 50% of the patients. In the group of boys with epilepsy, we found Mg, Ca, Cu and Fe deficiency, and normal level of Zn. In the group of girls with epilepsy, apart from low Fe concentration, a high level of Ca, Mg, Zn, and Cu was noted. For girls with the Down's syndrome, a high or normal level of Ca, Mg, Zn and Cu was found, whereas the Fe concentration varied and presented itself in a non-characteristic way. Both groups of children with cerebral palsy, i.e. boys and girls, displayed low Fe concentration in their hair; low Cu level was found in older patients as well. In this group of patients, we also noted high concentrations of Ca, Mg and Zn in girls and normal in boys. A high concentration of Ca in girls with cerebral palsy requires separate analysis. The obtained results could be useful as guidance in the direction and determination of the amount of possible patient nutritional supplementation.
    Źródło:
    Acta Biochimica Polonica; 2017, 64, 2; 279-285
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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