Abstract
The present study describes a novel method for the histochemical demonstration of β-galactosidase activity on tissue sections. We have replaced 5-bromo-4-chloro-3-indolyl-β-D-galactoside (X-Gal) with 5-bromoindolyl-β-o-galactopyranoside (Bluo-Gal) as a chromogenic substrate for the bacterial β-galactosidase (lacZ). After β-galactosidic cleavage, Bluo-Gal precipitates in form of fine birefringent crystals, whereas X-gal gives rise to an amorphous precipitate. Upon microscopic examination under polarized light, the crystals emit a strong signal consisting of yellow reflected light. This property of Bluo-Gal results in greatly enhanced sensitivity of the staining method for β-galactosidase and allows for optimal morphological resolution. To exemplify the applications of this technique, the expression is demonstrated in transgenic mice of β-galactosidase driven by a fragment of the human tissue-type plasminogen activator promoter.
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Aguzzi, A., Theuring, F. Improved in situ β-galactosidase staining for histological analysis of transgenic mice. Histochemistry 102, 477–481 (1994). https://doi.org/10.1007/BF00269579
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DOI: https://doi.org/10.1007/BF00269579