Summary
This study was designed to determine the effects of cycloheximide, a protein synthesis inhibitor that interferes with rRNA synthesis and processing, on the nucleoli and coiled bodies of supraoptic nucleus neurons from normally-hydrated and osmotically-stimulated rats. The number of nucleoli and the nucleolar size were estimated on smear preparations of previously silver-impregnated supraoptic nucleus. No significant differences were registered in the mean number of nucleoli per cell in cycloheximide-treated rats. The number of nucleoli per neuron remained constant, at about 1.3, in all animal groups, suggesting that the nucleoli number is strictly regulated in differentiated neurons. By contrast, a significant reduction in the average nucleolar volume of supraoptic nucleus neurons was detected in cycloheximide-treated groups of rats in comparison with their equivalent non-treated groups. By electron microscopy, most nucleoli and coiled bodies of supraoptic nucleus neurons exhibited cycloheximide-induced alterations in their fine structure and configuration. Nucleolar changes included the occurrence of a few large fibrillar centres, the formation of microspherules and small intranucleolar vacuoles or dilated interstices, and the partial segregation of nucleolar components coupled with the transformation of reticulated nucleoli — a nucleolar configuration characteristic of supraoptic nucleus neurons of non-cycloheximide-treated rats — into compact ones. The redistribution of nucleolar components might reflect the interference with rDNA transcription, and also supports the hypothesis that the normal assembly of these components into the nucleolus depends upon ongoing nucleolar transcription. Concerning coiled bodies, most of them revealed ultrastructural alterations, particularly segregation of the amorphous matrix, compactation of coiled threads and formation of coiled body-derived dense bodies of fibrillar nature. Moreover, cycloheximide also induced the formation of smaller dense bodies — here referred to as dense microbodies — which presumably represent a distinct nuclear entity different from coiled bodies. Ultrastructural silver staining of nuclear bodies showed a selective silver reaction on the dense fibrillar component of normal and altered coiled bodies, as well as on the dense microbodies. The possible relationship between the nucleolus and both coiled bodies and dense microbodies is discussed.
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References
Andersen, L. (1990) Number, volume and size distribution of nucleoli in rat neurosecretory cells with suppressed and stimulated secretion.Acta Anatomica 137, 311–15.
Andrade, L. E. C., Chan, E. K. L., Raska, I., Peebles, C. L., Rods, G. &Tan, E. M. (1991) Human autoantibody to a novel protein of the nuclear coiled body: immunological characterization and cDNA cloning of p-80-coilin.Journal of Experimental Medicine 173, 1407–19.
Bell, P., Dabauvalle, M. C. &Scheer, U. (1992)In vitro assembly of prenucleolar bodies in Xenopus egg extract.Journal of Cell Biology 118, 1297–304.
Brasch, K. (1990) Drug and metabolite-induced perturbations in nuclear structure and function: a review.Biochemistry and Cell Biology 68, 408–26.
Brasch, K. &Ochs, R. L. (1992) Nuclear bodies (NBs): a newly ‘rediscovered’ organelle.Experimental Cell Research 202, 211–23.
Carmo-Fonseca, M., Pepperkok, R., Carvalho, M. T. &Lamond, A. I. (1992) Transcription-dependent colocalization of the U1, U2, U4/U6, and U5 snRNPs in coiled bodies.Journal of Cell Biology 117, 1–14.
Carmo-Fonseca, M., Ferreira, J. &Lamond, A. I. (1993) Assembly of snRNP-containing coiled bodies is regulated in interphase and mitosis — evidence that the coiled body is a kinetic nuclear structure.Journal of Cell Biology 120, 841–52.
Cavanagh, J. B., Tomiwa, K. &Munro, M. G. (1987) Nuclear and nucleolar damage in adryamicin-induced toxicity of rat sensory ganglion cells.Neuropathology and Applied Neurobiology 13, 23–38.
Choy, V. J. &Watkins, W. B. (1977) Immunocytochemical study of the hypothalamo-neurohypophysial system. II. Distribution of neurophysin, vasopressin and oxytocin in the normal and osmotically stimulated rat.Cell and Tissue Research 180, 467–90.
Clark, P., Jones, K. J. &Lavelle, A. (1990) Ultrastructural and morphometric analysis of nucleolar and nuclear changes during the early growth period in hamster facial neurons.Journal of Comparative Neurology 302, 749–60.
Clark, P., Jones, K. J. &Lavelle, A. (1991) Ultrastructural changes in the nucleolus of facial motor neurons following axotomy during an early critical period in development.Journal of Comparative Neurology 312, 132–44.
Daskal, Y., Woodard, C., Crooke, S. T. &Busch, H. (1978) Comparative ultrastructural studies of nucleoli of tumor cells treated with adriamycin and the newer anthracyclines, carminomycin and marcellomycin.Cancer Research 38, 467–78.
Derenzini, M., Farabegoli, F., Pession, A. &Novello, F. (1987) Spatial redistribution of ribosomal chromatin in the fibrillar centres of human circulating lymphocytes after stimulation of transcription.Experimental Cell Research 170, 31–41.
Edwards, D. R. &Mahadevan, L. C. (1992) Protein synthesis inhibitors differentially superinduce c-fos and c-jun by three distinct mechanisms: lack of evidence for labile repressers.EMBO Journal 11, 2415–24.
Fakan, S. (1971) Inhibition of nucleolar RNP synthesis by cycloheximide as studied by high resolution radio-autography.Journal of Ultrastructure Research 34, 586–96.
Fakan, S., Leser, G. &Martin, T. (1984) Ultrastructural distribution of nuclear ribonucleoproteins as visualized by immunocytochemistry on thin sections.Journal of Cell Biology 98, 358–63.
Garcia-Segura, L. M., Berciano, M. T. &Lafarga, M. (1993) Nuclear compartmentalization in transcriptionally activated hypothalamic neurons.Biology of the Cell 77, 143–54.
Gokal, P. K., Cavanaugh, A. H. &Thompson, Jr., E. A. (1986) The effects of cycloheximide upon transcription of rRNA, 5S RNA, and tRNA genes.Journal of Biological Chemistry 261, 2536–41.
Hadjiolov, A. A. (1985)Thenucleolus and ribosome biogenesis. Wien: Springer Verlag.
Haggar, R. A. (1957) Behavior of the accessory body of Cajal during axonal reaction.Journal of Comparative Neurology 108, 269–83.
Hardin, J. W., Spicer, S. S. &Green, W. B. (1969) The paranucleolar structure, accessory body of Cajal, sex chromatin, and related structures in nuclei of rat trigeminal neurons: a cytochemical and ultrastructural study.Anatomical Record 164, 403–32.
Hatton, G. &Walters, J. K. (1973) Induced multiple nucleoli, nucleolar margination, and cell size changes in supraoptic neurons during dehydration and rehydration in the rat.Brain Research 59, 137–54.
Hatton, G. (1990) Emerging concepts of structure-function dynamics in adult brain: the hypothalamo-neurohypophysial system.Progress in Neurobiology 34, 437–504.
Hernandez-Verdun, D., Robert-Nicoud, M., Geraud, G. &Masson, C. (1991) Behaviour of nucleolar proteins in nuclei lacking ribosomal genes. A study by confocal laser scanning microscopy.Journal of Cell Science 98, 99–105.
Hervas, J. P., Villegas, J., Crespo, D. &Lafarga, M. (1980) Coiled bodies in supraoptic nucleus of the rat hypothalamus during the postnatal period.American Journal of Anatomy 159, 447–54.
Jones, H. B. &Cavanagh, J. B. (1986) The axon reaction in spinal ganglion neurons of acrylamide-treated rats.Acta Neuropathologica 71, 55–63.
Kawata, M., Mccabe, J. T., Harrington, C., Chikaraishi, D. &Pfaff, D. W. (1988)In situ hybridization analysis of osmotic stimulus-induced changes in ribosomal RNA in rat supraoptic nucleus.Journal Comparative Neurology 270, 528–36.
Kinderman, N. B. &Lavelle, A. (1976) A nucleolusassociated coiled body.Journal of Neurocytology 5, 545–50.
Lafarga, M., Hervas, J. P., Santa-Cruz, M. C., Villegas, J. &Crespo, D. (1983) The ‘accessory body’ of Cajal in the neuronal nucleus. A light and electron microscopic approach.Anatomy and Embryology 166, 19–30.
Lafarga, M., Berciano, M. T., Hervas, J. P. &Villegas, J. (1989) Nucleolar organization in granule cell neurons of the rat cerebellum.Journal of Neurocytology 18, 19–26.
Lafarga, M., Andres, M. A., Berciano, M. T. &Maquiera, E. (1991) Organization of nucleoli and nuclear bodies in osmotically stimulated supraoptic neurons of the rat.Journal of Comparative Neurology 308, 329–39.
Lafarga, M., Berciano, M. T., Martinez-Guijarro, F. J., Andres, M. A., Mellström, B., Lopez-Garcia, C. &Naranjo, J. R. (1992) Fos-like expression and nuclear size in osmotically stimulated supraoptic nucleus neurons.Neuroscience 50, 867–75.
Lafarga, M., Berciano, M. T. &Andres, M. A. (1993a) Protein-synthesis inhibition induces perichromatin granule accumulation and intranuclear rodlet formation in osmotically stimulated supraoptic neurons.Anatomy and Embryology 187, 363–9.
Lafarga, M., Martinez-Guijarro, F. J., Berciano, M. T., Blasco-Ibańez, J. M., Andres, M. A., Mellström, B., Lopez-Garcia, C. &Naranjo, J. R. (1993b) Nuclear Fos domains in transcriptionally activated supraoptic nucleus neurons.Neuroscience 57, 353–64.
Lamond, A. I. &Carmo-Fonseca, M. (1993) The coiled body.Trends in Cell Biology 3, 198–204.
Mccabe, J. E., Kawata, M., Sano, Y., Pfaff, D. W. &Desharnis, R. A. (1990) Quantitativein situ hybridization to measure single-cell changes in vasopressih and oxytocin mRNA levels after osmotic stimulation.Cellular and Molecular Neurobiology 10, 59–71.
Mehta, P. P., Yamamoto, M. &Rose, B. (1992) Transcription of the gene for the Gap junctional protein connexin43 and expression of functional cell-to-cell channels are regulated by cAMP.Molecular Biology of the Cell 3, 839–50.
Monneron, A. &Bernhard, W. (1969) Fine structural organization of the interphase nucleus in some mammalian cells.Journal of Ultrastructure Research 27, 266–88.
Moreno, F. J., Hernandez-Verdun, D., Masson, C. &Bouteille, M. (1985) Silver staining of the nucleolar organizer regions (NORs) on Lowicryl and cryo-ultrathin sections.Journal of Histochemistry and Cytochemistry 33, 389–99.
Moreno-Diaz De La Espina, S., Risueńo, M. C. &Medina, J. (1982) Ultrastructural, cytochemical and autoradiographic characterization of coiled bodies in the plant cell nucleus.Biology of the Cell 44, 229–38.
Olmedilla, A., Risueno, M. C. &Fernandez-Gomez, M. A. (1987) Action of alfa-amanitin, ethidium bromide and cycloheximide on rRNA metabolism in plant cells.Biology of the Cell 60, 183–92.
Paula-Barbosa, M. M., Sousa, N. &Madeira, M. D. (1993) Ultrastructural evidence of sexual dimorphism in supraoptic neurons: a morphometric study.Journal of Neurocytology 22, 697–706.
Perez, J., Naftolin, F. &Garcia-Segura, L. M. (1993) Cycloheximide mimics effects of oestradiol that are linked to synaptic plasticity of hypothalamic neurons.Journal of Neurocytology 22, 233–43.
Price, D. L. &Porter, K. R. (1972) The response of ventral horn neurons to axonal transection.Journal of Cell Biology 53, 24–37.
Ramon Y Cajal, S. (1903) Un sencillo método de coloración selectiva del retículo protoplasmático y sus efectos en los diverses órganos nerviosos de vertebrados e invertebrados.Trabajos de Laboratorio en Investigaciones Biológicas 2, 129–221.
Raska, I., Ochs, R. L., Andrade, L. E. C., Chan, E. K. L., Burlingame, R., Peebles, C., Gruol, D. &Tan, E. M. (1990) Association between the nucleolus and the coiled body.Journal of Structural Biology 104, 120–7.
Raska, I., Andrade, L. E. C., Ochs, R. L., Chan, E. K. L., Chang, C-M., Roos, G. &Tan, E. M. (1991) Immunological and ultrastructural studies of the nuclear coiled body with autoimmune antibodies.Experimental Cell Research 195, 27–37.
Spector, D. L., Lark, G. &Huang, S. (1992) Differences in snRNP localization between transformed and nontrans-formed cells.Molecular Biology of the Cell 3, 555–69.
Stoyanova, B. B. &Hadjiolov, A. A. (1979) Alterations in the processing of rat-liver ribosomal RNA caused by cycloheximide inhibition of protein synthesis.European Journal of Biochemistry 96, 349–56.
Stoykova, A. S., Dabeva, M. D., Dimova, R. N. &Hadjiolov, A. A. (1985) Ribosome biogenesis and nucleolar ultrastructure in neuronal and oligodendroglial rat brain cells.Journal of Neurochemistry 45, 1667–76.
Tomiwa, K., Nolan, C. &Cavanagh, J. B. (1986) The effects of cisplatin on rat spinal ganglia: a study by light and electron microscopy and by morphometry.Acta Neuropathologica 69, 295–308.
Vazquez, D. (1976) Twenty five years of research on inhibitors of protein synthesis: prospects for future developments in the subject. In:Reflections on Biochemistry (edited byKornberg, A., Horecker, B. L., Cornudella, L. &Oro, J.) pp. 347–56. Oxford: Pergamon Press.
Wachtler, F., Popp, W. &Schwarzacher, H. G. (1987) Structural changes in nucleoli during inhibition of protein- and RNA-biosynthesis.Cell and Tissue Research 247, 583–9.
Yu, F. L. &Feigelson, P. (1972) The rapid turnover of RNA polymerase of rat liver nucleolus, and of its messenger RNA.Proceedings of the National Academy of Sciences (USA) 69, 2833–7.
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Lafarga, M., Berciano, M.T., Andres, M.A. et al. Effects of cycloheximide on the structural organization of the nucleolus and the coiled body in normal and stimulated supraoptic neurons of the rat. J Neurocytol 23, 500–513 (1994). https://doi.org/10.1007/BF01184073
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DOI: https://doi.org/10.1007/BF01184073