Synopsis
In serial cross-sections of human skeletal muscles stained for either NADH-tetrazolium reductase (NADH-TR) or α-glycerophosphate dehydrogenase (α-GPD), a linear relation was found between the total content of enzyme in a cell (expressed as the thickness of the section) and the absorbance of the formazan reaction product formed. Little variation (<4.8%) was found in the concentration of formazan (absorbance per unit thickness) when the same cell was measured in serial cross-sections of various thicknesses (2–10 μm) along a longitudinal distance of at least 200 μm along the cell. The reduction in enzyme activity was found to be negligible after aqueous preincubation. A maximum of 10–12% of the formazan produced in the NADH-TR reaction might be the result of ‘nothing dehydrogenase’ activity, whereas this unspecific reaction might account for up to 20% of the formazan deposited in the α-GPD reactions after 30 min incubation. The diffusion of Nitro BT into the tissue during the incubation period was found to be unhindered. The rates of formazan production decreased with increasing incubation time, especially in the α-GPD reaction in both fibre types. The ratio of the mean absorbance of the formazan in type I fibres to that in type II fibres (in the same section) was 1.41 (coefficient of variation, 2.5%) in the NADH-TR reaction and 0.68 (coefficient of variation, 3.8%) in the α-GPD reaction. These values were not affected either by variations in the incubation time (5–40 min) or by the thickness of the section (2–8 μm). The concentrations of NADH-TR and α-GPD seem to be constant along the length of the muscle fibre. The histochemical reactions reported, together with measurements of the thickness of the sections, seem suitable for the microphotometric quantification of the two enzymes in single fibres of human skeletal muscles.
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Halkjaer-Kristensen, J., Ingemann-Hansen, T. Microphotometric analysis of NADH-tetrazolium reductase and α-glycerophosphate dehydrogenase in human quadriceps muscle. Histochem J 11, 127–136 (1979). https://doi.org/10.1007/BF01002990
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DOI: https://doi.org/10.1007/BF01002990