Histochemical demonstration of enteropeptidase activity. New method with a synthetic substrate and its comparison with the trypsinogen procedure

1983 ◽  
Vol 78 (2) ◽  
pp. 251-270 ◽  
Author(s):  
Z. Lojda ◽  
R. Gossrau
Keyword(s):  
Histochemical Demonstration ◽  
New Method ◽  
Synthetic Substrate

scholarly journals HISTOCHEMICAL DEMONSTRATION OF β-d-GLUCURONIDASE WITH A SYNTHETIC SUBSTRATE

1954 ◽  
Vol 2 (3) ◽  
pp. 209-229 ◽  
Author(s):  
ARNOLD M. SELIGMAN ◽  
KWAN-CHUNG TSOU ◽  
SELMA H. RUTENBURG ◽  
RICHARD B. COHEN
Keyword(s):  
Histochemical Demonstration ◽  
Synthetic Substrate

A new method for the histochemical demonstration ofO-acyl sugars in human colonic epithelial glycoproteins

1988 ◽  
Vol 20 (9) ◽  
pp. 510-518 ◽  
Author(s):  
P. E. Reid ◽  
D. Volz ◽  
K. Y. Cho ◽  
D. A. Owen
Keyword(s):  
Histochemical Demonstration ◽  
New Method ◽  
Acyl Sugars

scholarly journals A novel tetrazolium method for peroxidase histochemistry and immunohistochemistry.

1991 ◽  
Vol 39 (4) ◽  
pp. 541-544 ◽  
Author(s):  
G I Murray ◽  
C O Foster ◽  
S W Ewen
Keyword(s):  
Peroxidase Activity ◽  
Histochemical Demonstration ◽  
New Method ◽  
Tetrazolium Salt ◽  
Immunoperoxidase Technique ◽  
Red Cell ◽  
Final Reaction Product ◽  
Biopsy Specimens ◽  
Oxidation Of Phenol ◽  
Indirect Immunoperoxidase

We developed a new method for the histochemical demonstration of peroxidase. This method, which has a novel reaction mechanism, is based on the oxidation of phenol by peroxidase and coupling of this reaction to the reduction of a tetrazolium salt, with the deposition of an insoluble formazan at sites of enzyme activity. This new method was compared with an established diaminobenzidine (DAB) technique for peroxidase histochemistry and immunohistochemistry. Although both methods identified peroxidase activity in myeloid cells of bone marrow biopsy specimens, there was no interference from red cell pseudoperoxidase activity with the phenol-tetrazolium method, in contrast to the diaminobenzidine method. The detection of cytokeratin using an indirect immunoperoxidase technique was compared with both methods for demonstrating peroxidase activity. The phenol-tetrazolium method gave results similar to that obtained with DAB and appeared to be at least as sensitive as DAB in detecting low amounts of antigen. In addition, the production of a formazan as the final reaction product means that the phenol-tetrazolium method is ideally suited for quantitative peroxidase histochemistry. Therefore, the phenol-tetrazolium method represents a useful alternative method to DAB and for certain applications offers significant advantages over DAB.

scholarly journals Histochemical demonstration of unsaturated hydrophilic lipids with palladium chloride.

1977 ◽  
Vol 25 (3) ◽  
pp. 200-205 ◽  
Author(s):  
J A Kiernan
Keyword(s):  
Solvent Extraction ◽  
Standard Technique ◽  
Histochemical Demonstration ◽  
New Method ◽  
Histochemical Method ◽  
Palladium Chloride ◽  
Unsaturated Lipids ◽  
Metallic Palladium

Compounds in which olefinic linkages are accessible to aqueous reagents reduce the chloropalladite ion [PdCl4]2-, to metallic palladium. This reaction is used in a histochemical method whereby hydrophilic unsaturated lipids are stained dark brown or black. The specificity of the new method has been confirmed by means of solvent-extraction and chemical blocking procedures and by comparison with other histochemical techniques. Yellow staining of collagen, keratin and cytoplasm is probably due to attachment of the chloropalladite anion to proteins. The yellow background can be largely decolorized by treating the sections with aqueous pyridine, which forms colorless complexes with divalent palladium. A standard technique for staining with palladium is presented and the method is discussed in relation to other histochemical procedures that demonstrate unsaturated lipids.

scholarly journals Improvement in the Histochemical Localization of Leucine Aminopeptidase with a New Substrate, L-Leucyl-4-Methoxy-2-Naphthylamide

1960 ◽  
Vol 7 (2) ◽  
pp. 261-264 ◽  
Author(s):  
Marvin M. Nachlas ◽  
Benito Monis ◽  
David Rosenblatt ◽  
Arnold M. Seligman
Keyword(s):  
Leucine Aminopeptidase ◽  
Hydrolysis Product ◽  
Histochemical Demonstration ◽  
New Method ◽  
Lipid Solubility ◽  
Rapid Rate ◽  
Frozen Sections ◽  
Enzyme Localization ◽  
Copper Chelate ◽  
Fresh Frozen

A new method for the histochemical demonstration of leucine aminopeptidase in fresh frozen sections was developed with the substrate L-leucyl-4-methoxy-2-naphthylamide. The superior enzyme localization is due to the more rapid rate of coupling of the hydrolysis product, 4-methoxy-2-naphthylamine as compared to 2-naphthylamine itself, and to the low lipid solubility and high substantivity for protein of the copper chelate of the dye formed on coupling with tetrazotized diorthoanisidine. A comparison of the old and the new method is illustrated, and a description is given of the localization of leucine aminopeptidase in the tissues of the rat and man.

The diagnosis of metabolic storage disease in skin biopsies (a light-, electronmicroscopic, and analytical study)

1978 ◽  
Vol 36 (2) ◽  
pp. 648-649
Author(s):  
W. Jurecka ◽  
W. Gebhart ◽  
H. Lassmann
Keyword(s):  
Storage Disease ◽  
Hunter Syndrome ◽  
Histochemical Demonstration ◽  
Sweat Glands ◽  
Type I ◽  
Storage Material ◽  
Scheie Syndrome ◽  
Storage Products ◽  
Skin Biopsies ◽  
Type V

Diagnosis of metabolic storage disease can be established by the determination of enzymes or storage material in blood, urine, or several tissues or by clinical parameters. Identification of the accumulated storage products is possible by biochemical analysis of isolated material, by histochemical demonstration in sections, or by ultrastructural demonstration of typical inclusion bodies. In order to determine the significance of such inclusions in human skin biopsies several types of metabolic storage disease were investigated. The following results were obtained.In MPS type I (Pfaundler-Hurler-Syndrome), type II (Hunter-Syndrome), and type V (Ullrich-Scheie-Syndrome) mainly “empty” vacuoles were found in skin fibroblasts, in Schwann cells, keratinocytes and macrophages (Dorfmann and Matalon 1972). In addition, prominent vacuolisation was found in eccrine sweat glands. The storage material could be preserved in part by fixation with cetylpyridiniumchloride and was also present within fibroblasts grown in tissue culture.

Selective Sampling and Orientation of Non-Homogeneous Tissues

1968 ◽  
Vol 26 ◽  
pp. 98-99
Author(s):  
C. C. Clawson ◽  
L. W. Anderson ◽  
R. A. Good
Keyword(s):  
Electron Microscopy ◽  
Electron Microscope ◽  
Light Microscopy ◽  
Random Sampling ◽  
New Method ◽  
Microscope Examination ◽  
Small Areas ◽  
Selective Sampling ◽  
Large Numbers ◽  
Specific Orientation

Investigations which require electron microscope examination of a few specific areas of non-homogeneous tissues make random sampling of small blocks an inefficient and unrewarding procedure. Therefore, several investigators have devised methods which allow obtaining sample blocks for electron microscopy from region of tissue previously identified by light microscopy of present here techniques which make possible: 1) sampling tissue for electron microscopy from selected areas previously identified by light microscopy of relatively large pieces of tissue; 2) dehydration and embedding large numbers of individually identified blocks while keeping each one separate; 3) a new method of maintaining specific orientation of blocks during embedding; 4) special light microscopic staining or fluorescent procedures and electron microscopy on immediately adjacent small areas of tissue.

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