Abstract
We report on the application of a pyrogallol red-vanadium complex (PR-V) for ultracytochemical staining of proteinaceous structures in animal tissues and cell cultures. This dye may be used as a general purpose stain in electron microscopy. In contrast to osmium tetroxide, the price of the material is low and no toxic vapors are produced. The PR-V complex was prepared by addition of vanadium (IV) oxide sulfate to pyrogallol red dissolved in acetate buffer (pH 5.6). The formation of the complex was indicated by a color change from purplered (λmax=520 nm) to violet (λmax=539 nm) which occurred at equimolar concentrations of the dye and the metal salt. Under these conditions PR-V was stable for several days. The mechanism of PR-V binding was checked in dot blots using different proteins as well as heparin for control. While heparin remained unstained, proteins were stained in a dose-dependent manner. Deamination of proteins with nitric oxide strongly reduced PR-V staining in dot blots as well as in cell cultures. Optimal staining results of animal cells and tissues were obtained in specimens that had been mildly fixed for at least 1 h or longer with a mixture of 0.1% glutaraldehyde and 1.0% paraformaldehyde dissolved in phosphate-buffered saline, pH 7.2, washed with acetate buffer, pH 5.6, and subsequently treated with PR-V in the presence of 50% ethanol at room temperature. Control specimens without PR-V but treated en bloc with uranyl acetate or sodium molybdate showed similar contrast but less details in the ultrastructure of the tissue. All specimens were embedded in epoxy resin and ultrathin sections were stained conventionally with uranyl and lead salt solutions. In electron micrographs, membrane-associated particles, stress fibers and filaments of the cell cortex, collagen fibrils, tight junctions and desmosomes, and other proteinaceous components were clearly visualized only in the PR-V-treated speciments. In conclusion, the ability to bind selectively and specifically to proteinaceous structures makes PR-V a versatile stain to study the localization and distribution of these structures in cells and tissues at the ultrastructural level.
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Antonovich VP, Pisareva EN, Grekova IM, Yakovleva TP (1976) Spectrophotometric characteristics, acid-base properties, and π-electronic structure of pyrogallol red and brompyrogallol red. J Anal Chem USSR 31:1691–1697
Bahr GF (1955) Continued studies about the fixation with osmium tetroxide, Electron stains IV. Exp Cell Res 9:277–285
Dudareva GN, Dudarev VI, Morgen EA, Vlasov NA (1977) UV and IR spectroscopic examination of complex formation between vanadium(V) and triphenylmethane dyes. J Anal Chem USSR 32:980–983
Esriche JM, Cabeza AS, Guardia Cirugeda M de la, Reig FB (1983) Spectrophotometric determination of vanadium by oxidation of pyrogallol red. Analyst 108:1402–1408
Escriche JM, Cabeza AS, Estelles ML (1986) Aplicationanalyticas del rojo de pirogalol. Quimica Analitica 5:229–244
Fujita Y, Mori I, Kitano S (1983) Color reaction between pyrogallol red-molybdenum (VI) complex and protein. Bunseki Kagaku 32:E379–386
Hopwood D (1972) Theoretical and practical aspects of glutaraldehyde fixation. Histochem J 4:267–303
Macart M, Forzy G, Gerbaut L, Vekich AJ, Guilbaud JC (1994) Measuring urinary protein with the new BioRad reagent kit: evaluation and comparison with five other methods. Ann Biol Clin 51:355–360
Mashige F, Ohkubo A (1991) Determination of proteins in urine by high-performance liquid chromatography with spectrophotometric detection using a pyrogallol red-molybdate complex. J Chromatogr 565:173–181
Mori I, Fujita Y, Fujita K, Kitano S, Ogawa I, Kawabe H, Koshiyama Y, Tanaka T (1986) Color reaction among pyrogallol red, thorium(IV) and samarium(III), and its application to the determination of these metals. Bull Chem Soc Jpn 59:955–957
Orndorf WR, Fuchs N (1939) Pyrogallolsulfonephthalein, sulfonegallein, 2,3,4-trihydroxy-benzoyl-benzene-ortho-sulfonic acid (the intermediate acid), and some of their derivatives. J Am Chem Soc 48:1939–1951
Orsonneau J-L, Douet P, Massoubre C, Lustenberger P, Bernard S (1989) An improved pyrogallol red-molybdate method for determining total urinary protein. Clin Chem 35:2233–2236
Palladini G, Lauro G, Basile A (1970) Observations sur la spécifité de la coloration aux acides phosphotungstique et posphomolybdique. Histochemie 24:315–321
Reynolds ES (1963) The use of lead citrate at high pH as an electron-opaque stain in electron microscopy. J Cell Biol 17:208–212
Sicilia D, Rubio S, Pérez-Bendito D (1993) Micellar effects on reaction kinetics. Part I. Simultaneous determination of chromium (VI), vanadium (V) and titanium (IV). Analytical Chimica Acta 284:149–157
Sohon MD (1898) An investigation of some derivatives of orthosulphobenzoic anhydride. Am Chem J 20:257–278
Spurr AR (1969) A low viscosity epoxy resin embedding medium for electron microscopy. J Ultrastruct Res 26:31–43
Spuk V, Malát M, Jenicková A (1956) Komplexometrische Titrationen (Chelatometrie) XVI. Bestimmung von Wismut, Nickel und Kobalt gegen Pyrogallolrot. Collection Czechoslov Chem Commun 21:4180–422
Vodá Z, Leminger O (1956) Sulfonphthaleine II. Darstellung und Eigenschaften von Pyrogallolsulfonphathalein (Pyrogallolrot), eines neuen chelatometrischen Indikators. Collection Czechosov Chem Commun 21:1522–1527
Watanabe N, Kamai S, Ohkubo A, Yamanaka M, Ohsawa S, Makino K, Tokuda K (1986) Urinary protein as measured with a pyrogallol red-molybdate complex, manually and in a Hitachi 726 automated analyzer. Clin Chem 32:1551–1554
Watson ML (1958) Staining of tissue sections for electron microscopy with heavy metals. J Biophys Biochem Cytol 4:475–478
Zingsheim HP, Plattner H (1976) Electron microscopic methods in membrane biology. In: Korn D (ed) Methods in membrane biology. Plenum Publishing Corporation, New York, pp 1–146
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Völker, W., Kampsmeyer, H.H. & Robenek, H. Pyrogallol red-vanadium complex—a new stain for electron microscopy. Histochem Cell Biol 106, 503–510 (1996). https://doi.org/10.1007/BF02473313
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DOI: https://doi.org/10.1007/BF02473313