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Related Experiment Videos

Altered proteasome structure, function, and oxidation in aged muscle.

Deborah A Ferrington1, Aimee D Husom, LaDora V Thompson

  • 1Department of Ophthalmology, 380 Lions Research Bldg., 2001 6th Street SE, University of Minnesota, Minneapolis, MN 55455, USA. ferri013@umn.edu

FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology
|January 29, 2005
PubMed
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Aging impairs the proteasome, the cell

Area of Science:

  • Muscle physiology
  • Cellular biology
  • Aging research

Background:

  • The proteasome degrades oxidized proteins.
  • Oxidized protein accumulation is linked to aging.
  • Skeletal muscle aging involves proteasome changes.

Purpose of the Study:

  • Investigate age-related alterations in proteasome function.
  • Determine if proteasome dysfunction contributes to oxidized protein buildup in aging muscle.

Main Methods:

  • Compared proteasome structure, function, and oxidation in young and aged rat skeletal muscle.
  • Assessed proteasome content, regulatory protein levels, and catalytic activity.
  • Evaluated degradation of oxidized calmodulin and effects of DTT.

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Main Results:

  • Aged muscle showed increased 20S proteasome and immunoproteasome content.
  • Regulatory proteins (PA700, PA28) were reduced in aged muscle.
  • Aged proteasomes exhibited reduced specific activity and impaired degradation of oxidized calmodulin, potentially due to cysteine oxidation.

Conclusions:

  • Age-related changes in proteasome structure and function occur in skeletal muscle.
  • Reduced proteasome activity and impaired oxidized protein clearance may contribute to aging.
  • Oxidation of key cysteines may inhibit proteasome function in aged muscle.