Acta Neuropathologica

, Volume 112, Issue 6, pp 681–689 | Cite as

α-Synuclein is colocalized with 14-3-3 and synphilin-1 in A53T transgenic mice

  • Yoshitomo Shirakashi
  • Yasuhiro Kawamoto
  • Hidekazu Tomimoto
  • Ryosuke Takahashi
  • Masafumi Ihara
Original Paper

Abstract

α-Synuclein is a major constituent of Lewy bodies, the neuropathological hallmark of Parkinson’s disease (PD). Three types of α-synuclein mutations, A53T, A30P, and E46K, have been reported in familial PD. Wild-type α-synuclein accumulates at high concentrations in Lewy bodies, and this process is accelerated with mutated A53T α-synuclein. The accumulation of α-synuclein is thought to be toxic, and causes neuronal death when α-synuclein aggregates into protofibrils and fibrils. Lewy bodies contain not only α-synuclein, but also other proteins including 14-3-3 proteins and synphilin-1. 14-3-3 Proteins exist mainly as dimers and are related to intracellular signal transduction pathways. Synphilin-1 is known to interact with α-synuclein, promoting the formation of cytoplasmic inclusions like Lewy bodies in vitro. To investigate the colocalization of α-synuclein, synphilin-1, and 14-3-3 proteins, we performed immunohistochemical studies on α-synuclein, 14-3-3 proteins, and synphilin-1 in the brain and spinal cord of A53T transgenic mice. In homozygous mouse brains, α-synuclein immunoreactivity was observed in the neuronal somata and processes in the medial part of the brainstem, deep cerebellar nuclei, and spinal cord. The distribution of 14-3-3 proteins and synphilin-1 immunoreactivity was similar to that of α-synuclein in the homozygous mice. Double immunofluorescent staining showed that α-synuclein and synphilin-1 or 14-3-3 proteins were colocalized in the pons and spinal cord. These results indicate that the accumulation of mutant α-synuclein occurs in association with 14-3-3 proteins and synphilin-1, and may cause the sequestration of important proteins including 14-3-3 proteins and synphilin-1. The sequestration and subsequent decrease in 14-3-3 proteins and synphilin-1 levels may account for neuronal cell death.

Keywords

α-Synuclein A53T transgenic mice Parkinson’s disease 14-3-3 Proteins Synphilin-1 Immunohistochemistry 

Notes

Acknowledgments

We are grateful to Prof. V. M. Lee (Department of Pathology and Laboratory Medicine, University of Pennsylvania) for providing the A53T-Tg mice, and to Prof. E. Iseki (Department of Psychiatry, Juntendo University School of Medicine) for providing the anti-synphilin-1 antibodies.

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Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  • Yoshitomo Shirakashi
    • 1
  • Yasuhiro Kawamoto
    • 1
  • Hidekazu Tomimoto
    • 1
  • Ryosuke Takahashi
    • 1
  • Masafumi Ihara
    • 1
    • 2
  1. 1.Department of Neurology, Graduate School of MedicineKyoto UniversityKyotoJapan
  2. 2.Biochemistry and Cell Biology Unit, Horizontal Medical Research Organization, Graduate School of MedicineKyoto UniversityKyotoJapan

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