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(American Journal of Pathology. 2002;160:255-263.)
© 2002 American Society for Investigative Pathology

Regular Articles

p62 Is a Common Component of Cytoplasmic Inclusions in Protein Aggregation Diseases

Kurt Zatloukal^*, Cornelia Stumptner^*, Andrea Fuchsbichler^*, Hans Heid, Martina Schnoelzer, Lukas Kenner^*, Reinhold Kleinert^*, Marco Prinz, Adriano Aguzzi and Helmut Denk^*

From the Department of Pathology,^*
Karl-Franzens University, Graz, Austria; the Division of Cell Biology,
German Cancer Research Center, Heidelberg, Germany; Protein Analysis Facility,
German Cancer Research Center, Heidelberg, Germany; and the Institute of Neuropathology,
University Hospital of Zürich, Zürich, Switzerland

Exposure of cells to stress, particularly oxidative stress, leads to misfolding of proteins and, if they are not refolded or degraded, to cytoplasmic protein aggregates. Protein aggregates are characteristic features of a variety of chronic toxic and degenerative diseases, such as Mallory bodies (MBs) in hepatocytes in alcoholic and non-alcoholic steatohepatitis, neurofibrillary tangles in neurons in Alzheimer’s, and Lewy bodies in Parkinson’s disease. Using 2D gel electrophoresis and mass spectrometry, we identified p62 as a novel MB component. p62 and cytokeratins (CKs) are major MB constituents; HSP 70, HSP 25, and ubiquitinated CKs are also present. These proteins characterize MBs as a prototype of disease-associated cytoplasmic inclusions generated by stress-induced protein misfolding. As revealed by transfection of tissue culture cells overexpressed p62 did not induce aggregation of regular CK filaments but selectively bound to misfolded and ubiquitinated CKs. The general role of p62 in the cellular response to misfolded proteins was substantiated by detection of p62 in other cytoplasmic inclusions, such as neurofibrillary tangles, Lewy bodies, Rosenthal fibers, intracytoplasmic hyaline bodies in hepatocellular carcinoma, and 1-antitrypsin aggregates. The presence of p62 along with other stress proteins and ubiquitin in cytoplasmic inclusions indicates deposition as aggregates as a third line of defense against misfolded proteins in addition to refolding and degradation.

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