title: The profile of lysosomal exoglycosidases in replicative and stress-induced senescence in early passage human fibroblasts.
abstract: The aim of the present study was to assess the profiles of the exoglycosidases: N-acetyl-β-hexosoaminidase, β glucuronidase and β galactosidase, α mannosidase and α fucosidase in fibroblast culture undergoing replicative and stress-induced senescence. Half of the cell culture was grown in normal conditions, without the stressor, and the other half of the cell was treated with 0.15 mM tert-butylhydroperoxide. The activities of total N-acetyl-β-hexosoaminidase as well as β glucuronidase in the cell lysate were determined in duplicates using the method of Marciniak et al. The activities of β galactosidase, α mannosidase and α fucosidase in the cell lysate were determined in duplicates using the method of Chatteriee et al. with the modification by Zwierz et al. The activities of the exoglycosidases examined, with the exception of β glucuronidase, showed a significant increase between individual days of the experiment in both non-stressed and stressed fibroblast cell culture. On each day of the experiment, in the cell lysate of stressed fibroblasts, the activities of exoglycosidases were significantly higher compared to the non-stressed cells. There were very strong correlations between SA-β-GAL staining and b galactosidase activity on individual days of the experiment in both non-stressed and stressed fibroblast cell culture. Replicative and stress-induced senescence results in significant changes to the level of lysosomal exoglycosidases, and results in enhanced lysosomal degradative capacity.
authors: Research Laboratory of Cosmetology, Medical University of Bialystok, Poland. knass@umb.edu.pl
authors: Małgorzata
authors: M
authors: Knaś
authors: Anna
authors: A
authors: Zalewska
authors: Rafał
authors: R
authors: Krętowski
authors: Marek
authors: M
authors: Niczyporuk
authors: Napoleon
authors: N
authors: Waszkiewicz
authors: Marzanna
authors: M
authors: Cechowska-Pasko
authors: Danuta
authors: D
authors: Waszkiel
authors: Krzysztof
authors: K
authors: Zwierz
mesh_terms: D002478:Cells, Cultured; D016922:Cellular Senescence / Q000187:drug effects; D005347:Fibroblasts / Q000166:cytology* / Q000187:drug effects / Q000201:enzymology*; D006026:Glycoside Hydrolases / Q000378:metabolism*; D006801:Humans; D008247:Lysosomes / Q000187:drug effects / Q000201:enzymology*; D012044:Regression Analysis; D013312:Stress, Physiological / Q000187:drug effects; D001616:beta-Galactosidase / Q000378:metabolism; D020122:tert-Butylhydroperoxide / Q000494:pharmacology
chemical_list: D020122:tert-Butylhydroperoxide; D006026:Glycoside Hydrolases; D001616:beta-Galactosidase