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Thick filaments in vertebrate smooth muscle

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Summary

Smooth muscle cells of the mouse vas deferens fixed with 5% glutaraldehyde contained three types of filaments, namely, thin (50–80 Å) filaments, intermediate (100 Å) filaments and thick (120–180 Å) filaments. However, in 2 out of 16 experiments, under identical conditions, the cells did not contain thick filaments. With OsO4 fixation, thin filaments were not prominent, the most obvious being thick (120–250 Å) and intermediate (100 Å) filaments.

After soaking in a modified Ringer solution under no applied tension for one hour, thick filaments (120–180 Å) appeared prominently in smooth muscle cells of the mouse vas deferens and thin filaments were in ordered bundles. By 4 hours, thick filaments had increased in size and density, with thin filaments distributed randomly around them. After 8 hours in Ringer, thin filaments were diffuse and difficult to discern, while thick filaments were large (up to 300 Å) and electron-dense. Intermediate (100 Å) filaments were present in association with dark bodies. Physiological experiments indicated that the intracellular components responsible for the development of a mechanical response were still functional at this time.

The presence of “thick filaments” is also reported in degenerating smooth muscle cells of the guinea-pig vas deferens in tissue culture.

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We are extremely grateful for the collaboration, helpful advice and guidance of Professor Yasuo Uehara. We would also like to thank Dr. P. Berger for performing the organ-bath studies and Professor G. Burnstock for the use of laboratory facilities. G. R. Campbell and J. H. Chamley are holders of post-doctoral research fellowships from the National Heart Foundation of Australia and the Life Insurance Medical Research Fund of Australia and New Zealand respectively.

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Campbell, G.R., Chamley, J.H. Thick filaments in vertebrate smooth muscle. Cell Tissue Res. 156, 201–216 (1975). https://doi.org/10.1007/BF00221803

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