Proteasome Inhibitors Protect Against Degeneration of Nigral Dopaminergic Neurons in Hemiparkinsonian Rats

DOI Web Site PubMed 被引用文献6件 参考文献67件
  • Inden Masatoshi
    Department of Neurobiology, Kyoto Pharmaceutical University
  • Kondo Jun-ichi
    Department of Neurobiology, Kyoto Pharmaceutical University
  • Kitamura Yoshihisa
    Department of Neurobiology, Kyoto Pharmaceutical University 21st Century COE Program, Kyoto Pharmaceutical University
  • Takata Kazuyuki
    Department of Neurobiology, Kyoto Pharmaceutical University
  • Nishimura Kaneyasu
    Department of Neurobiology, Kyoto Pharmaceutical University
  • Taniguchi Takashi
    Department of Neurobiology, Kyoto Pharmaceutical University 21st Century COE Program, Kyoto Pharmaceutical University
  • Sawada Hideyuki
    Department of Neurology, Graduate School of Medicine, Kyoto University
  • Shimohama Shun
    Department of Neurology, Graduate School of Medicine, Kyoto University

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Parkinson’s disease is characterized by dopaminergic neuronal death and the presence of Lewy bodies in the substantia nigra pars compacta (SNpc). α-Synuclein and ubiquitin are components of Lewy bodies, but the process of Lewy body formation and the relationship between inclusion formation and dopaminergic neuronal death have not been resolved. In this study, unilateral intranigral microinjection of 6-hydroxydopamine caused a significant loss of tyrosine hydroxylase-immunopositive neurons in both the substantia nigra and striatum and apomorphine-induced contralateral rotation. The co-administration of proteasome inhibitors, such as lactacystin or carbobenzoxy-<sc>L</sc>-leucyl-<sc>L</sc>-leucyl-<sc>L</sc>-leucinal (MG-132), significantly prevented both dopaminergic neurodegeneration and apomorphine-induced rotational asymmetry. Proteasome inhibitors markedly formed intracellular protein inclusions labeled by thioflavin-S in the SNpc. Inclusion-like immunoreactivities for α-synuclein and ubiquitin were detected after 4 weeks. These results suggest that proteasome plays an important role in both the early phase of dopaminergic neuronal death and inclusion body formation.<br>

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