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Histochemistry

, Volume 42, Issue 3, pp 271–286 | Cite as

Histochemical demonstration of the intestinal hetero-β-galactosidase (glucosidase)

  • Z. Lojda
  • E. Havránková
  • J. Slabý
Article

Summary

The histochemical demonstration of hetero-β-galactosidase (glucosidase) has been attempted in sections and zymograms of rabbit, monkey and human intestine and of rat kidney.

The leakage of this enzyme from unfixed sections was prevented by the use of cold microtome sections adherent to semipermeable membranes. Methods with β-D-glucosides and galactosides of 6-Br-2-naphthol (postincubation azocoupling with Fast Blue B as well as simultaneous azocoupling with hexazonium-p-rosaniline), of α-naphthol (simultaneous azocoupling with hexazonium-p-rosaniline) and of 4-Cl-5-Br-3-indolyl (with ferricyanide, phenazonium methosulfate or nitro BT and without any oxidation agent) were used an evaluated concerning the specificity, localization ability and inhibition of enzyme activity. Pretreatment of sections with distilled water or saline and inhibition by p-Cl-mercuribenzoate, glucono- and galactono-lactones were used for the characterization of the demonstrated enzyme activity.

6-Br-2-naphthyl-β-D-glucoside is the most specific substrate for hetero-β-galactosidase. It is not split by lactase and acid β-galactosidase. Only lysosomal β-glucosidase can interfere. Because the latter enzyme is membrane-bound the difference in color intensity between untreated and prewashed sections are due to hetero-β-galactosidase. Only localization on the cellular (not intracellular) level can be achieved, however.

The simultaneous azocoupling method with α-naphthyl-β-D-glucoside and hexazonium-p-rosaniline enables a very good localization of hetero-β-galactosidase in the rabbit intestine. Due to a great inhibition exerted by hexazonium-p-rosaniline on the enzyme activity the method is unsuitable for the detection of hetero-β-galactosidase in zymograms and in the human intestine. Interference of lactase (or lactase-phlorizine hydrolase complex) is to be considered. The lysosomal β-glucosidase does not seem to interfere.

Indigogenic methods are not sensitive either. With ferricyanide as an oxidation agent it was not possible to detect the activity of hetero-β-galactosidase in zymograms and in sections. This is possibly due to overoxidation of indigo. The same holds true for phenazonium methosulfate used for the processing of zymograms. However, it was possible to reveal the activity of hetero-β-galactosidase in sections of the rabbit and monkey intestine with phenazonium methosulfate as oxidation agent. Nitro BT enhanced the coloration both in zymograms and in sections. In the latter case diffusion artifacts cannot be prevented, however. The interference of lactase, lysosomal β-galactosidase and possibly of lysosomal β-glucosidase (depending on the glycoside used) is always to be considered.

Hetero-β-galactosidase was localized in the cytoplasm (particularly in the supranuclear region) of differentiated enterocytes covering the villi of the rabbit (the highest activity), monkey and human (the lowest activity) intestine. In crypt enterocytes and in cells of Brunner's glands the activity was lower. The occurrence of a low activity of hetero-β-galactosidase in the brush border of enterocytes of the rabbit intestine was also demonstrated.

A proximodistal gradient was observed in the rabbit and monkey intestine, the upper jejunum displaying the highest activity.

In jejunal biopsies of patients with celiac sprue (in the acute stage of the disease) the activity of hetero-β-galactosidase was lowered. No changes of activity were observed in jejunal biopsies of patients with isolated deficiencies of lactase or sucrase.

In the rat kidney the enzyme was demonstrated particularly in the cytoplasm of cells of proximal convoluted tubules.

Keywords

Lactase Histochemical Demonstration Celiac Sprue Jejunal Biopsy Rabbit Intestine 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag 1974

Authors and Affiliations

  • Z. Lojda
    • 1
    • 2
  • E. Havránková
    • 1
    • 2
  • J. Slabý
    • 1
    • 2
  1. 1.Research Laboratory of Angiology, 1st Department of PathologyCharles UniversityPrahaČSSR
  2. 2.1st Department of Medical Chemistry, Faculty of General MedicineCharles UniversityPrahaČSSR

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