Electron Microscope Studies on Puromycin-Induced Changes in Nerve Cells of the Medulla Oblongata

Kawakami, Kiyoshi

doi:10.1083/jcb.63.3.1091

The Journal of Cell Biology

1974

DOI: 10.1083/jcb.63.3.1091

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Electron Microscope Studies on Puromycin-Induced Changes in Nerve Cells of the Medulla Oblongata

Kiyoshi Kawakami

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1975

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Cited by 9 publications

References 33 publications

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Morphological aspects of type II alveolar pneumocytes following treatment with puromycin in vivo

Collet

Chevalier

1977

Am. J. Anat.

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Ultrastructural modifications of type II pneumocytes (PNM-II) in mice were analysed 125 and 155 minutes after puromycin treatment (12 mg/100 gm at 0, 30, 60 and 90 minutes). A quantitative evaluation of the cell compartments was carried out and the inhibition of protein synthesis in PNM-II was monitored by light microscopic radioautography, following 3H-leucine injection. In electron micrographs, following a 125-minute puromycin treatment, the number and size of lamellar bodies, the precursors of lung surfactant material appeared markedly reduced. The multivesicular bodies (MVB), which are normally very frequent in PNM-II, had almost completely disappeared, as had composite bodies. Golgi saccules were dilated, while the area occupied by Golgi vesicles was enlarged. Observations following the 155-minute puromycin treatment showed a strong enhancement of these modifications. Smooth and coated vesicles of the Golgi area, as well as peroxisomes, did not appear modified by puromycin. Elongated zones of autophagy were more prevalent after 125-minute treatment than after the 155-minute one. Small bodies were frequently observed in the cytoplasm, near the Golgi zone. They were bounded by a smooth membrane and contained tiny vesicles and/or electron-dense lamellae similar to those present within the lamellar bodies. Parallel membranes formed folds, some of them in continuity with lamellar bodies, thus encircling portions of cytoplasm. These structures, which were few in number in controls, were very frequently observed in treated cells, mainly after the 125-minute treatment. These extensive alterations of PNM-II morphology appeared to be related to a disturbed production of pulmonary surfactant.

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Morphological aspects of type II alveolar pneumocytes following treatment with puromycin in vivo

Collet

Chevalier

1977

Am. J. Anat.

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Inhibitor induced alterations of chromatoid bodies in male germ line cells of Xenopus laevis

1975

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The action of inhibitors of protein synthesis on the structure of cytoplasmic inclusions found in the male germ cell line of the anuran, Xenopus laevis, has been studied by light and electron microscopy. Results indicate that one such inclusion, the chromatoid body, is sensitive to treatment with either chloramphenicol or puromycin. These drugs administered in vivo or in vitro cause up to a thirty-fold increase in the volume of the chromatoid body in all stages where it is normally present. Maximum size increase obtainable is the same for either drug, but is different and characteristic for each germ cell stage. Drug action is dose dependent, with "chromatoid body syndrome" occurring over a relatively narrow concentration range. Cyclohexamide, in contrast to chloramphenicol or puromycin, does not produce a clear increase in the size of chromatoid bodies, and is capable of blocking the action of the other drugs at normally effective concentrations. Results obtained in this investigation suggest that primary spermatogonia contain enough chromatoid body material to account for the total amount present in all subsequent germ cell stages. This fact, coupled with other studies where chromatoid-like bodies have been observed, suggests the hypothesis that the chromatoid body represents at least in part an aggregation stage of materials associated with the microtubule population of the germ cell line. Alternately, or in addition, ribonucleoprotein may contribute to the structure of the chromatoid body.

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Fine structural and cytochemical observations on lamellar bodies in nerve cells of the medulla oblongata of the rat

Kawakami

1975

Cell Tissue Res.

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Stuctures identified as lamellar bodies have observed in neurons of the dorsal sensory nucleus of the vagus of the rat medulla oblongata. They consist of stacks of parallel, regularly spaced cisternae which either run straight or curve forming a whorl. Finely textured, electron-dense fibrils are present between adjacent cisternae which are devoid of ribosomes. Ribosomes are attached only to the outermost surface of outer cisternae which are often continous with rough endoplasmic reticulum. Cytochemical studies reveal that these intercisternal fibrils contain abundant amino and imidazole groups as well as carboxyl groups. It is suggested that lamelar bodies arise by close alignment of parallel rough surfaced cisternae with subsqent loss of ribosomes from their surface. In addition, it is inferred that polar groups of intercisternal fibrils play an important role in the regular arrangement of cisternal membranes and in the dissociation of ribosomes from cisternae.

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Electron Microscope Studies on Puromycin-Induced Changes in Nerve Cells of the Medulla Oblongata

Cited by 9 publications

References 33 publications

Morphological aspects of type II alveolar pneumocytes following treatment with puromycin in vivo

Morphological aspects of type II alveolar pneumocytes following treatment with puromycin in vivo

Inhibitor induced alterations of chromatoid bodies in male germ line cells of Xenopus laevis

Fine structural and cytochemical observations on lamellar bodies in nerve cells of the medulla oblongata of the rat

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