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Immunocytochemical demonstration of the lysosomal enzyme alpha-glucosidase in the brush border of human intestinal epithelial cells. 1988

J A Fransen, and L A Ginsel, and P H Cambier, and J Klumperman, and R P Oude Elferink, and J M Tager
Laboratory for Electron Microscopy, University of Leiden/The Netherlands.

In investigations on the intracellular transport route(s) of lysosomal enzymes in polarized epithelial cells, we used immunocytochemical methods to localize lysosomal alpha-glucosidase in human small-intestinal epithelial cells. Two monoclonal antibodies which can discriminate between different biosynthetic forms of this enzyme were used. One monoclonal antibody, 43D1, which recognizes all forms of the enzyme, showed labeling of the Golgi apparatus, the lysosomes and, unexpectedly, of the brush border of the cells. Multivesicular bodies were free of label. In contrast, monoclonal antibody 43G8, which recognizes all forms except the 110,000 Da precursor of alpha-glucosidase, showed labeling of the lysosomes only. This leads us to conclude that the 110,000 Da precursor form of alpha-glucosidase is present in the Golgi apparatus and the brush border of human small-intestinal epithelial cells. Moreover, biochemical experiments show that this precursor copurifies with sucrase, a typical brush-border marker, when a partially purified microvilli fraction is prepared.

UI MeSH Term Description Entries
D007150 Immunohistochemistry Histochemical localization of immunoreactive substances using labeled antibodies as reagents. Immunocytochemistry,Immunogold Techniques,Immunogold-Silver Techniques,Immunohistocytochemistry,Immunolabeling Techniques,Immunogold Technics,Immunogold-Silver Technics,Immunolabeling Technics,Immunogold Silver Technics,Immunogold Silver Techniques,Immunogold Technic,Immunogold Technique,Immunogold-Silver Technic,Immunogold-Silver Technique,Immunolabeling Technic,Immunolabeling Technique,Technic, Immunogold,Technic, Immunogold-Silver,Technic, Immunolabeling,Technics, Immunogold,Technics, Immunogold-Silver,Technics, Immunolabeling,Technique, Immunogold,Technique, Immunogold-Silver,Technique, Immunolabeling,Techniques, Immunogold,Techniques, Immunogold-Silver,Techniques, Immunolabeling
D007413 Intestinal Mucosa Lining of the INTESTINES, consisting of an inner EPITHELIUM, a middle LAMINA PROPRIA, and an outer MUSCULARIS MUCOSAE. In the SMALL INTESTINE, the mucosa is characterized by a series of folds and abundance of absorptive cells (ENTEROCYTES) with MICROVILLI. Intestinal Epithelium,Intestinal Glands,Epithelium, Intestinal,Gland, Intestinal,Glands, Intestinal,Intestinal Gland,Mucosa, Intestinal
D007422 Intestines The section of the alimentary canal from the STOMACH to the ANAL CANAL. It includes the LARGE INTESTINE and SMALL INTESTINE. Intestine
D008247 Lysosomes A class of morphologically heterogeneous cytoplasmic particles in animal and plant tissues characterized by their content of hydrolytic enzymes and the structure-linked latency of these enzymes. The intracellular functions of lysosomes depend on their lytic potential. The single unit membrane of the lysosome acts as a barrier between the enzymes enclosed in the lysosome and the external substrate. The activity of the enzymes contained in lysosomes is limited or nil unless the vesicle in which they are enclosed is ruptured or undergoes MEMBRANE FUSION. (From Rieger et al., Glossary of Genetics: Classical and Molecular, 5th ed). Autolysosome,Autolysosomes,Lysosome
D008854 Microscopy, Electron Microscopy using an electron beam, instead of light, to visualize the sample, thereby allowing much greater magnification. The interactions of ELECTRONS with specimens are used to provide information about the fine structure of that specimen. In TRANSMISSION ELECTRON MICROSCOPY the reactions of the electrons that are transmitted through the specimen are imaged. In SCANNING ELECTRON MICROSCOPY an electron beam falls at a non-normal angle on the specimen and the image is derived from the reactions occurring above the plane of the specimen. Electron Microscopy
D008871 Microvilli Minute projections of cell membranes which greatly increase the surface area of the cell. Brush Border,Striated Border,Border, Brush,Border, Striated,Borders, Brush,Borders, Striated,Brush Borders,Microvillus,Striated Borders
D004848 Epithelium The layers of EPITHELIAL CELLS which cover the inner and outer surfaces of the cutaneous, mucus, and serous tissues and glands of the body. Mesothelium,Epithelial Tissue,Mesothelial Tissue,Epithelial Tissues,Mesothelial Tissues,Tissue, Epithelial,Tissue, Mesothelial,Tissues, Epithelial,Tissues, Mesothelial
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000520 alpha-Glucosidases Enzymes that catalyze the exohydrolysis of 1,4-alpha-glucosidic linkages with release of alpha-glucose. Deficiency of alpha-1,4-glucosidase may cause GLYCOGEN STORAGE DISEASE TYPE II. Acid Maltase,Lysosomal alpha-Glucosidase,Maltase,Maltases,Maltase-Glucoamylase,Neutral Maltase,Neutral alpha-Glucosidase,alpha-Glucosidase,Lysosomal alpha Glucosidase,Maltase Glucoamylase,Neutral alpha Glucosidase,alpha Glucosidase,alpha Glucosidases,alpha-Glucosidase, Lysosomal,alpha-Glucosidase, Neutral
D000911 Antibodies, Monoclonal Antibodies produced by a single clone of cells. Monoclonal Antibodies,Monoclonal Antibody,Antibody, Monoclonal

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