Abstract
Using laser confocal microscopy and some vital fluorescent dyes (acridine orange, RH 414, DiOC6(3), rhodamine 123, fluorescein dextran), changes of the T-system and cellular acidic organelles were studied during spreading (Zenker’s) necrosis of isolated frog skeletal muscle fibers. The most characteristic of the initial stages of development of Zenker’s necrosis is the formation of numerous vacuoles as a result of local T-system swellings. The vacuole length can reach tens of micrometers. They are located both near nuclear poles and between myofibrils. Until the moment of contraction knot separation, the vacuoles preserve their connections with normal T-tubules and under certain conditions (glycerol influx to the fiber) are reversible. The vacuoles deform nuclei and cisternae of the sarcoplasmic reticulum. Acidic cell organelles accumulating acridine orange (lysosomes, late endosomes, trans-Golgi cisternae) are located in the immediate vicinity both of normal and of vacuolated T-tubules. In the course of the development of the pathological process, the size and number of acidic organelles increases and they tend to be clustered. Vacuolation of the T-system during necrosis was not accompanied by vacuole content acidification. At late stages of necrosis, alterations of nuclei and sarcoplasmic reticulum were observed. The role of cellular acidic organelles and of the T-system vacuolation in development of various muscle pathologies is discussed.
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Abbreviations
- AO:
-
acridine orange
- SR:
-
sarcoplasmic reticulum
- ZN:
-
Zenker’s necrosis
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Original Russian Text © S.A. Krolenko, S.Ya. Adamyan, T.N. Belyaeva, T.P. Mozhenok, A.V. Salova, 2007, published in Tsitologiya, Vol. 49, No. 2, 2007.
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Krolenko, S.A., Adamyan, S.Y., Belyaeva, T.N. et al. Confocal microscopy study of membrane organelles of the skeletal muscle fiber in the process of Zenker’s (spreading) necrosis. Cell Tiss. Biol. 1, 183–190 (2007). https://doi.org/10.1134/S1990519X07020101
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DOI: https://doi.org/10.1134/S1990519X07020101