title: Protein quality control during aging involves recruitment of the macroautophagy pathway by BAG3.
abstract: The Hsc/Hsp70 co-chaperones of the BAG (Bcl-2-associated athanogene) protein family are modulators of protein quality control. We examined the specific roles of BAG1 and BAG3 in protein degradation during the aging process. We show that BAG1 and BAG3 regulate proteasomal and macroautophagic pathways, respectively, for the degradation of polyubiquitinated proteins. Moreover, using models of cellular aging, we find that a switch from BAG1 to BAG3 determines that aged cells use more intensively the macroautophagic system for turnover of polyubiquitinated proteins. This increased macroautophagic flux is regulated by BAG3 in concert with the ubiquitin-binding protein p62/SQSTM1. The BAG3/BAG1 ratio is also elevated in neurons during aging of the rodent brain, where, consistent with a higher macroautophagy activity, we find increased levels of the autophagosomal marker LC3-II as well as a higher cathepsin activity. We conclude that the BAG3-mediated recruitment of the macroautophagy pathway is an important adaptation of the protein quality control system to maintain protein homeostasis in the presence of an enhanced pro-oxidant and aggregation-prone milieu characteristic of aging.
authors.affiliation: Department of Pathobiochemistry, Institute for Physiological Chemistry and Pathobiochemistry, Medical School, Johannes Gutenberg University, Mainz, Germany.
authors.forename: Martin
authors.initials: M
authors.lastname: Gamerdinger
authors.forename: Parvana
authors.initials: P
authors.lastname: Hajieva
authors.forename: A Murat
authors.initials: AM
authors.lastname: Kaya
authors.forename: Uwe
authors.initials: U
authors.lastname: Wolfrum
authors.forename: F Ulrich
authors.initials: FU
authors.lastname: Hartl
authors.forename: Christian
authors.initials: C
authors.lastname: Behl
mesh_terms: D048868:Adaptor Proteins, Signal Transducing / Q000378:metabolism*; D000818:Animals; D051017:Apoptosis Regulatory Proteins; D001343:Autophagy / Q000502:physiology*; D016922:Cellular Senescence / Q000502:physiology*; D004268:DNA-Binding Proteins / Q000378:metabolism; D006801:Humans; D007150:Immunohistochemistry; D051379:Mice; D046529:Microscopy, Electron, Transmission; D046988:Proteasome Endopeptidase Complex / Q000378:metabolism; D051381:Rats; D017207:Rats, Sprague-Dawley; D014157:Transcription Factors / Q000378:metabolism
chemical_list: D048868:Adaptor Proteins, Signal Transducing; D051017:Apoptosis Regulatory Proteins; C414431:BAG3 protein, human; C091732:BCL2-associated athanogene 1 protein; D004268:DNA-Binding Proteins; D014157:Transcription Factors; D046988:Proteasome Endopeptidase Complex