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Relationship Between the Ubiquitin-Dependent Pathway and Apoptosis in Different Cells of the Central Nervous System: Effect of Thyroid Hormones

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Abstract

We have recently shown that sustained neonatal hyperthyroidism in the rat activates apoptosis of oligodendroglial cells (OLGc) and that inhibition of the proteasome-ubiquitin (Ub) pathway by lactacystin produces increased apoptosis in cerebellar granule cells (CGC). In the present study we have analyzed the relationship between the activation of the Ub-dependent pathway, the expression of the Ub genes and programmed cell death in neurons of the rat cerebellum and cerebral cortex and in OLGc. This study was carried out in normal animals, in rats submitted to sustained neonatal hyperthyroidism and in cell cultures treated with an excess of thyroid hormones. In neurons of the cerebral cortex, thyroid hormone produces an increase of Ub-protein conjugates, an enhancement in the expression of the Ub genes and an increase in apoptosis, while the opposite results are obtained in CGC. These results indicate that in neurons, the changes in the cell death program produced by thyroid hormone run in parallel with those occurring in the Ub-dependent pathway. In OLGc, thyroid hormone increases apoptosis but does not produce changes in the Ub pathway. Preliminary studies indicate that in coincidence with what occurs in optic nerves, the sciatic nerves both in controls and in hyperthyroid animals are unable to form Ub-protein conjugates. These results indicate that in cells of the CNS such as neurons, in which the Ub-dependent pathway is actively expressed, it appears to be closely correlated with apoptosis.

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Authors and Affiliations

  1. Institute of Biological and Physical Chemistry (IQUIFIB) UBA-CONICET and Department of Biological Chemistry, Faculty of Pharmacy and Biochemistry, University of Buenos Aires, Junín 956, 1113, Buenos Aires, Argentina

    Laura A. Pasquini, Cecilia B. Marta, Ana M. Adamo & Juana M. Pasquini

  2. Institute of Biological and Physical Chemistry (IQUIFIB) UBA-CONICET and Department of Biological Chemistry, Faculty of Pharmacy and Biochemistry, University of Buenos Aires, Junín 956, 1113, Buenos Aires, Argentina

    Eduardo F. Soto

Authors
  1. Laura A. Pasquini
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  2. Cecilia B. Marta
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  3. Ana M. Adamo
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  4. Juana M. Pasquini
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  5. Eduardo F. Soto
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Pasquini, L.A., Marta, C.B., Adamo, A.M. et al. Relationship Between the Ubiquitin-Dependent Pathway and Apoptosis in Different Cells of the Central Nervous System: Effect of Thyroid Hormones. Neurochem Res 25, 627–635 (2000). https://doi.org/10.1023/A:1007554902352

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