A simple histochemical method for the identification of cytotrophoblasts in tissue sections

Placenta ◽  
2016 ◽  
Vol 42 ◽  
pp. 84-86 ◽  
Author(s):  
Carolyn J.P. Jones ◽  
Saxon C. Whittle ◽  
John D. Aplin
Keyword(s):  
Histochemical Method ◽  
Tissue Sections

scholarly journals The Histochemical Localization of Triphosphopyridine Nucleotide Diaphorase

1958 ◽  
Vol 4 (4) ◽  
pp. 467-474 ◽  
Author(s):  
Marvin M. Nachlas ◽  
Donald G. Walker ◽  
Arnold M. Seligman
Keyword(s):  
Macula Densa ◽  
Histochemical Method ◽  
Histochemical Localization ◽  
Kidney Cortex ◽  
Tetrazolium Salt ◽  
Tissue Sections ◽  
Isocitric Dehydrogenase ◽  
Diaphorase Activity

A histochemical method is described for the localization of triphosphopyridine nucleotide diaphorase using a recently synthesized tetrazolium salt (Nitro-BT). By virtue of the favorable histochemical properties of this reagent, it has been possible to demonstrate that whereas DPN diaphorase is usually restricted to the mitochondria, the TPN diaphorase activity of corresponding cells was distributed throughout the cytoplasm in granules too fine to be considered mitochondria. Furthermore, although the diaphorase alone is responsible for the passage of electrons from TPNH to the tetrazole, it has been found that sites of activity of different TPN-linked dehydrogenases can be visualized in tissue sections, and characteristic loci for each enzyme may be observed. For example, whereas TPN diaphorase and isocitric dehydrogenase have an extensive distribution in the kidney cortex, 6-phosphogluconic dehydrogenase is limited to the cells of the macula densa.

scholarly journals Quantitative Histochemical Assay for Superoxide Dismutase in Rat Brain

2003 ◽  
Vol 51 (7) ◽  
pp. 865-871 ◽  
Author(s):  
Alessandro Viggiano ◽  
Davide Viggiano ◽  
Andrea Viggiano ◽  
Bruno De Luca
Keyword(s):  
Superoxide Dismutase ◽  
Rat Brain ◽  
Uv Light ◽  
Histochemical Method ◽  
Superoxide Anions ◽  
Sod Activity ◽  
Tissue Sections ◽  
Capture Method ◽  
Copper Zinc ◽  
Major Factors

Superoxide anions are highly reactive radicals overproduced in many pathological situations such as inflammation and ischemia. One of the major factors in the protection from superoxide anions is the enzyme superoxide dismutase (SOD), which catalyzes the dismutation of superoxide to hydrogen peroxide. This study presents a quantitative histochemical method to estimate SOD activity in rat brain tissue sections. This method is based on the cerium capture method and 3,3'-diaminobenzidine amplification of transition cerium compounds. Substrate for SOD was provided by reduction of oxygen during the autoxidation of riboflavin in the presence of UV light. This histochemical method reveals the overall activity of the three different forms of SOD described in mammalian tissues: cytosolic copper-zinc SOD, mitochondrial manganese SOD, and the high molecular weight extracellular SOD. Eventually, this method can be used to quantify SOD activity in tissue sections by image analysis.

The Application of Protein A-Gold Immunocytochemistry to Studies of Protein Secretion

1985 ◽  
Vol 43 ◽  
pp. 426-429
Author(s):  
George H. Herbener ◽  
Antonio Nanci ◽  
Moise Bendayan
Keyword(s):  
Tissue Section ◽  
Colloidal Gold ◽  
Unit Area ◽  
Protein A ◽  
Extracellular Proteins ◽  
Gold Complex ◽  
Second Step ◽  
Igg Antibodies ◽  
Tissue Sections ◽  
Antigenic Sites

Protein A-gold immunocytochemistry is a two-step, post-embedding labeling procedure which may be applied to tissue sections to localize intra- and extracellular proteins. The key requisite for immunocytochemistry is the availability of the appropriate antibody to react in an immune response with the antigenic sites on the protein of interest. During the second step, protein A-gold complex is reacted with the antibody. This is a non- specific reaction in that protein A will combine with most IgG antibodies. The ‘label’ visualized in the electron microscope is colloidal gold. Since labeling is restricted to the surface of the tissue section and since colloidal gold is particulate, labeling density, i.e., the number of gold particles per unit area of tissue section, may be quantitated with ease and accuracy.

Discovery of intracellular 2,8 dihydroxyadenine crystals in bovine lymphatic and hepatic cells

1987 ◽  
Vol 45 ◽  
pp. 906-907
Author(s):  
W. E. Rigsby ◽  
D. M. Hinton ◽  
V. J. Hurst ◽  
P. C. McCaskey
Keyword(s):  
Polarized Light ◽  
Paraffin Sections ◽  
Tissue Samples ◽  
Whole Cells ◽  
Tissue Sections ◽  
Hepatic Cells ◽  
Slaughter House ◽  
Mammalian Tissues ◽  
Carbon Coated ◽  
Cellular Components

Crystalline intracellular inclusions are rarely seen in mammalian tissues and are often difficult to positively identify. Lymph node and liver tissue samples were obtained from two cows which had been rejected at the slaughter house due to the abnormal appearance of these organs in the animals. The samples were fixed in formaldehyde and some of the fixed material was embedded in paraffin. Examination of the paraffin sections with polarized light microscopy revealed the presence of numerous crystals in both hepatic and lymph tissue sections. Tissue sections were then deparaffinized in xylene, mounted, carbon coated, and examined in a Phillips 505T SEM equipped with a Tracor Northern X-ray Energy Dispersive Spectroscopy (EDS) system. Crystals were obscured by cellular components and membranes so that EDS spectra were only obtainable from whole cells. Tissue samples which had been fixed but not paraffin-embedded were dehydrated, embedded in Spurrs plastic, and sectioned.

Ultrastructural aspects of olfactory signal transduction and its development

1994 ◽  
Vol 52 ◽  
pp. 142-143
Author(s):  
Bert Ph. M. Menco
Keyword(s):  
Signal Transduction ◽  
Olfactory Receptor ◽  
Receptor Cell ◽  
Freeze Substitution ◽  
Luminal Surface ◽  
Tissue Sections ◽  
Olfactory Receptor Cells ◽  
Receptor Cells ◽  
Olfactory Signal ◽  
Odor Molecule

Vertebrate olfactory receptor cells are specialized neurons that have numerous long tapering cilia. The distal parts of these cilia line the interface between the external odorous environment and the luminal surface of the olfactory epithelium. The length and number of these cilia results in a large surface area that presumably increases the chance that an odor molecule will meet a receptor cell. Advanced methods of cryoprepration and immuno-gold labeling were particularly useful to preserve the delicate ultrastructural and immunocytochemical features of olfactory cilia required for localization of molecules involved in olfactory signal-transduction. We subjected olfactory tissues to freeze-substitution in acetone (unfixed tissues) or methanol (fixed tissues) followed by low temperature embedding in Lowicryl K11M for that purpose. Tissue sections were immunoreacted with several antibodies against proteins that are presumably important in olfactory signal-transduction.

Flat embeddment of monolayer cells, tissue sections, and other cellular materials attached onto glass substrate

1990 ◽  
Vol 48 (3) ◽  
pp. 766-767
Author(s):  
Jeffrey P. Chang ◽  
Jaang J. Wang
Keyword(s):  
Present Report ◽  
Cellular Materials ◽  
Cover Glass ◽  
Tissue Sections ◽  
Embedding Technique ◽  
Exfoliated Cells ◽  
Black Paper ◽  
Cell Concentrations ◽  
Flat Embedding

Flat embeddment of certain specimens for electron microscopy is necessary for three classes of biological materials: namely monolayer cells, tissue sections of paraffin or plastics, as well as cell concentrations, exfoliated cells, and cell smears. The present report concerns a flat-embedding technique which can be applied to all these three classes of materials and which is a modified and improved version of Chang's original methodology.Preparation of coverglasses and microslides. Chemically cleaned coverglasses, 11 × 22 mm or other sizes, are laid in rows on black paper. Ink-mark one coner for identifying the spray-side of the glass for growing cells. Lightly spray with Teflon monomer (Heddy/Contact Inductries, Paterson, NO 07524, U.S.A.) from a pressurized can. Bake the sprayed glasses at 500°F for 45 min on Cover-Glass Ceramic Racks (A. Thomas Co. Philadelphia), for Teflon to polymerize.Monolayer Cells. After sterilization, the Teflon-treated coverglasses, with cells attached, are treated or fixed in situ in Columbia staining dishes (A. Thomas Co., Philadelphia) for subsequent processing.

A combined pseudoreplica-immunocytochemical technique for research and diagnostic virology

1990 ◽  
Vol 48 (3) ◽  
pp. 900-901
Author(s):  
Blayne Fritz ◽  
Stanley J. Naides ◽  
Kenneth Moore
Keyword(s):  
Phosphotungstic Acid ◽  
Immunogold Labelling ◽  
Uranyl Acetate ◽  
Distilled Water ◽  
Clinical Specimens ◽  
Tissue Sections ◽  
Specimen Retrieval ◽  
Transmission Electron ◽  
Viral Particles ◽  
Diagnostic Virology

The pseudoreplica method of staining viral particles for visualization by transmission electron microscopy is a very popular technique. The ability to concentrate clinical specimens while semi-embedding viral particles makes it especially well suited for morphologic and diagnostic virology. Immunolabelling viral particles with colloidal gold is a technique frequently employed by both research and diagnostic virologists. We have characterized a procedure which provides the advantage of both by modifying and combining pseudoreplica staining and immunogold labelling.Modification of specimen retrieval and delay of staining allows us to utilize pseudoreplica processed specimens within our standard immunogold labelling protocol. In brief, we absorbed samples onto 2% agarose, added.25% Formvar and wicked dry. We then floated the Formvar-virus film onto double distilled water, added grids and retrieved with parafilm. The Formvar-virus specimens were then treated as thin tissue sections within our standard two stage immunolabelling protocol. Following completion of immunogold labelling; each grid was negatively stained with phosphotungstic acid or uranyl acetate contrast stains.

Sign in / Sign up

Export Citation Format

Share Document