title: Lysosomal hydrolases in macrophages exposed to swainsonine.
abstract: Swainsonine reversibly inhibits macrophage lysosomal acid alpha-mannosidase in vitro. When supplied to cultured cells for periods of up to 24 h, swainsonine penetrates the cells and produces a dose- and time-dependent inhibition of cellular alpha-mannosidase. Exposure of macrophages to swainsonine for 24 h, followed by continued incubation in the absence of this agent, produces elevated cellular activity of alpha-mannosidase, relative to unexposed controls; prolonged incubation of macrophage cultures with swainsonine for 1-2 weeks results also in significant increases in cell protein, lactate dehydrogenase activity and in that of another lysosomal enzyme, beta-hexosaminidase.
mesh_terms: D000470:Alkaloids / Q000494:pharmacology*; D000818:Animals; D002478:Cells, Cultured; D006596:Hexosaminidases / Q000378:metabolism*; D007700:Kinetics; D007770:L-Lactate Dehydrogenase / Q000378:metabolism; D008247:Lysosomes / Q000187:drug effects / Q000201:enzymology*; D008264:Macrophages / Q000201:enzymology*; D008361:Mannosidases / Q000378:metabolism*; D051379:Mice; D017026:Swainsonine; D043323:alpha-Mannosidase; D001619:beta-N-Acetylhexosaminidases
chemical_list: D000470:Alkaloids; D007770:L-Lactate Dehydrogenase; D006596:Hexosaminidases; D008361:Mannosidases; D043323:alpha-Mannosidase; D001619:beta-N-Acetylhexosaminidases; D017026:Swainsonine