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Wyszukujesz frazę "Graczyk, Alfreda" wg kryterium: Autor


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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