title: Lysosomal enzyme trafficking between phagosomes, endosomes, and lysosomes in J774 macrophages. Enrichment of cathepsin H in early endosomes.
abstract: In this study we take advantage of recently developed methods using J774 macrophages to prepare enriched fractions of early endosomes, late endosomes, dense lysosomes, as well as phagosomes of different ages enclosing 1-micron latex beads to investigate the steady state distribution and trafficking of lysosomal enzyme activity between these organelles. At steady state these cells appear to possess four different cellular structures, in addition to phagolysosomes, where acid hydrolases were concentrated. The first site of hydrolase concentration was the early endosomes, which contained the bulk of the cellular cathepsin H. This enzyme was acquired by phagosomes significantly faster than the other hydrolases tested. The second distinct site of lysosomal enzyme concentration was the late endosomes which contain the bulk of cathepsin S. The third and fourth large pools of hydrolases were found in two functionally distinct types of dense lysosomes, only one of which was found to be secreted in the presence of chloroquine or bafilomycin. Among this secreted pool was soluble furin, generally considered only as a membrane-bound trans-Golgi network resident protein. Thus, the organelles usually referred to as "lysosomes" in fact encompass a growing family of highly dynamic but functionally distinct endocytic organelles.
authors.affiliation: Max Planck Institute for Medical Research, Heidelberg, Germany.
authors.forename: V
authors.initials: V
authors.lastname: Claus
authors.forename: A
authors.initials: A
authors.lastname: Jahraus
authors.forename: T
authors.initials: T
authors.lastname: Tjelle
authors.forename: T
authors.initials: T
authors.lastname: Berg
authors.forename: H
authors.initials: H
authors.lastname: Kirschke
authors.forename: H
authors.initials: H
authors.lastname: Faulstich
authors.forename: G
authors.initials: G
authors.lastname: Griffiths
mesh_terms: D000818:Animals; D002401:Cathepsin B / Q000378:metabolism; D056655:Cathepsin H; D002403:Cathepsins / Q000378:metabolism*; D002451:Cell Compartmentation; D002458:Cell Fractionation; D002460:Cell Line; D002738:Chloroquine / Q000494:pharmacology; D003546:Cysteine Endopeptidases / Q000378:metabolism*; D018819:Dipeptidyl Peptidase 4 / Q000378:metabolism; D004705:Endocytosis; D011992:Endosomes / Q000201:enzymology*; D045683:Furin; D006026:Glycoside Hydrolases / Q000378:metabolism; D007425:Intracellular Membranes / Q000201:enzymology; D007700:Kinetics; D008247:Lysosomes / Q000201:enzymology*; D008264:Macrophages / Q000201:enzymology* / Q000648:ultrastructure; D051379:Mice; D010588:Phagosomes / Q000187:drug effects / Q000201:enzymology* / Q000502:physiology; D013381:Subtilisins / Q000378:metabolism
chemical_list: D002738:Chloroquine; D006026:Glycoside Hydrolases; D002403:Cathepsins; D018819:Dipeptidyl Peptidase 4; D013381:Subtilisins; D045683:Furin; D003546:Cysteine Endopeptidases; D002401:Cathepsin B; D056655:Cathepsin H; C534127:Ctsh protein, mouse; C028217:cathepsin S