Abstract
Incubation of kidney lysosomes at 37° results in a graded release of lysosomal enzymes. The release of enzyme occurs in two stages. First the enzymes become available to the substrate but remain sedimentable. Later the amount of soluble enzyme increases and eventually is almost equal to that of the available enzyme. Morphological studies of lysosomes showed that during the process involving increasing availability of enzymes, the lysosomes remained intact. Release of the soluble enzymes was characterized ultrastructurally by a complete loss of the electron-opaque matrix contained within the lysosomal membrane. The increased release of soluble enzymes was concomitant with an increase in the number of individual lysosomes showing complete loss of contents, rather than a gradual loss or dilution of matrix density. Lysosomes which had lost their electron-opaque contents retained their outer membrane intact and were seen to contain numerous internal membranes and small vesicles.
Full Text
The Full Text of this article is available as a PDF (462.9 KB).
Selected References
These references are in PubMed. This may not be the complete list of references from this article.
- ESSNER E., NOVIKOFF A. B. Localization of acid phosphatase activity in hepatic lysosomes by means of electron microscopy. J Biophys Biochem Cytol. 1961 Apr;9:773–784. doi: 10.1083/jcb.9.4.773. [DOI] [PMC free article] [PubMed] [Google Scholar]
- GIANETTO R., DE DUVE C. Tissue fractionation studies. 4. Comparative study of the binding of acid phosphatase, beta-glucuronidase and cathepsin by rat-liver particles. Biochem J. 1955 Mar;59(3):433–438. doi: 10.1042/bj0590433. [DOI] [PMC free article] [PubMed] [Google Scholar]
- LOWRY O. H., ROBERTS N. R., WU M. L., HIXON W. S., CRAWFORD E. J. The quantitative histochemistry of brain. II. Enzyme measurements. J Biol Chem. 1954 Mar;207(1):19–37. [PubMed] [Google Scholar]
- MILLER F. Hemoglobin absorption by the cells of the proximal convoluted tubule in mouse kidney. J Biophys Biochem Cytol. 1960 Dec;8:689–718. doi: 10.1083/jcb.8.3.689. [DOI] [PMC free article] [PubMed] [Google Scholar]
- SABATINI D. D., BENSCH K., BARRNETT R. J. Cytochemistry and electron microscopy. The preservation of cellular ultrastructure and enzymatic activity by aldehyde fixation. J Cell Biol. 1963 Apr;17:19–58. doi: 10.1083/jcb.17.1.19. [DOI] [PMC free article] [PubMed] [Google Scholar]
- STRAUS W. CYTOCHEMICAL OBSERVATIONS ON THE RELATIONSHIP BETWEEN LYSOSOMES AND PHAGOSOMES IN KIDNEY AND LIVER BY COMBINED STAINING FOR ACID PHOSPHATASE AND INTRAVENOUSLY INJECTED HORSERADISH PEROXIDASE. J Cell Biol. 1964 Mar;20:497–507. doi: 10.1083/jcb.20.3.497. [DOI] [PMC free article] [PubMed] [Google Scholar]
- TRUMP B. F., ERICSSON J. L. ELECTRON MICROSCOPIC OBSERVATIONS ON THE LOCALIZATION OF ACID PHOSPHATASE IN MOUSE HEPATIC PARENCHYMAL CELLS. Exp Cell Res. 1964 Feb;33:598–601. doi: 10.1016/0014-4827(64)90030-8. [DOI] [PubMed] [Google Scholar]