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Related Experiment Videos

Nuclear relocation of normal huntingtin.

T Tao1, A M Tartakoff

  • 1Pathology Department and Cell Biology Program, Case Western Reserve University, School of Medicine, Cleveland, OH 44106, USA.

Traffic (Copenhagen, Denmark)
|June 8, 2001
PubMed
Summary

Normal huntingtin protein (Htt) is found on endosomes but can enter the nucleus after DNA damage triggers its cleavage. This cleavage mechanism may explain how mutant Htt accumulates in the nucleus in Huntington's Disease (HD).

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Area of Science:

  • Cell Biology
  • Neuroscience
  • Genetics

Background:

  • Huntington's Disease (HD) is characterized by the accumulation of mutant huntingtin protein (Htt) in neuronal nuclei.
  • The role of normal Htt in nuclear localization and its potential release from cellular compartments is not fully understood.

Purpose of the Study:

  • To investigate whether normal full-length huntingtin protein (Htt) can access the cell nucleus.
  • To explore the mechanisms underlying Htt nuclear entry, particularly in the context of DNA damage and caspase activation.

Main Methods:

  • Utilized HeLa cells to examine the localization of normal full-length Htt.
  • Detected RNase-sensitive nuclear foci containing an N-terminal Htt fragment.
  • Investigated the effect of DNA-damaging agents on Htt cleavage and nuclear translocation.

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Main Results:

  • A significant portion of normal full-length Htt in HeLa cells is associated with endosomes.
  • RNase-sensitive nuclear foci containing a 70-kDa N-terminal Htt fragment were identified.
  • DNA-damaging agents induced caspase-3-dependent cleavage of Htt, leading to the dramatic relocation of the 70 kDa fragment to the nucleoplasm.

Conclusions:

  • Normal Htt can be released from membrane anchors (endosomes) via caspase cleavage following DNA damage, allowing nuclear entry.
  • Polyglutamine tracts may enhance caspase activation, predisposing mutant Htt to nuclear entry in Huntington's Disease.
  • This study provides the first evidence of caspase cleavage mediating the nuclear translocation of membrane-bound proteins.