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Localization of carbohydrate components in rat colon with fluoresceinated lectins

E Essner, J Schreiber and RA Griewski

Cryostat sections of rat descending colon were studied by fluorescence microscopy after exposure to conjugates of fluorescein isothicoyanate with lectins from Glycine max (soybean), Triticum vulgaris (wheat germ), Ricinus communis (castor bean), Ulex europaeus, (gorse), Dolichos biflorus (horse gram) and Canavalia ensiformis (concanavalin A) (Jack bean). No two lectins showed identical patterns of fluorescence. FITC-conjugates of soybean and D. biflorus lectins reacted strongly with the mucus present in the crypt lumens and with the surface (as well as cytoplasm) of the epithelial cells suggesting that these sites are rich in terminal, non-reducing, N- acetylgalactosamine residues. Wheat germ, R. communis, U. europaeus and concanavalin A-FITC conjugates did not stain mucus but showed fluorescence in the cytoplasm of absorptive cells as well as in the lamina propria and submucosa. The FITC-R. communis conjugate also reacted with structures in the apical portion of epithelial cells that may correspond to the Golgi apparatus.

Volume 26, Issue 6, pp. 452-458, 06/01/1978
Copyright © 1978 by The Histochemical Society


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