An improved method for beta-galactosidase activity detection on muscle tissue. A light and electron microscopic study

In the present study we describe a method for the histochemical demonstration of Bacterial beta-D-galactosidase activity on skeletal muscle tissue processed for light and transmission electron microscopy. Hence allowing this Enzyme to be accurately detected, Bacterial beta-galactosidase expression was studied in transgenic mouse where the Enzyme, with the nuclear localization signal (nlacZ), is under the transcriptional control of the striated muscle-specific promoter MLC3F. The chromogenic substrate, 5-bromo-3-indolyl-beta-D-galactopyranoside (Bluo-Gal), was used both to recognize labelled myofibers, and beta-gal positive organelles inside single myofibers. Moreover, because the preservation of Enzyme is highly dependent on tissue fixation, we developed a suitable fixation solution allowing good preservation of both tissue and enzymatic activity. This was achieved by briefly fixing tissue (3 hours) in glutaraldehyde (2.5%) and paraformaldehyde (1%) in combination. This method should be taken into consideration when studying the gene therapy of muscle diseases because it is sensitive, inexpensive and not time consuming.