Abstract:
:Malfunction of the ubiquitin-proteasome system has been implicated as a causal factor in the pathogenesis of aggregation-related disorders, e.g. Parkinson's disease. We show here that Transforming growth factor-beta 1 (TGF-beta), a multifunctional cytokine and trophic factor for dopaminergic (DAergic) neurons modulates proteasome function in primary midbrain neurons. TGF-beta differentially inhibited proteasomal subactivities with a most pronounced time-dependent inhibition of the peptidyl-glutamyl peptide hydrolyzing-like and chymotrypsin-like subactivity. Regulation of proteasomal activity could be specifically quantified in the DAergic subpopulation. Protein blot analysis revealed an accumulation of ubiquitinated proteins after TGF-beta treatment. The identity of these enriched proteins was further analyzed by 2D-gel electrophoresis and mass spectrometry. We found epidermal fatty acid binding protein (EFABP) to be strongly increased and ubiquitinated after TGF-beta treatment and confirmed this finding by co-immunoprecipitation. While application of TGF-beta increased neurite regeneration in a scratch lesion model, downregulation of EFABP by siRNA significantly decreased this effect. We thus postulate that a differential regulation of proteasomal function, as demonstrated for TGF-beta, can result in an enrichment of proteins, such as EFABP, that mediate physiological functions, such as neurite regeneration.
journal_name
Neurobiol Disjournal_title
Neurobiology of diseaseauthors
Knöferle J,Ramljak S,Koch JC,Tönges L,Asif AR,Michel U,Wouters FS,Heermann S,Krieglstein K,Zerr I,Bähr M,Lingor Pdoi
10.1016/j.nbd.2010.02.011subject
Has Abstractpub_date
2010-06-01 00:00:00pages
395-404issue
3eissn
0969-9961issn
1095-953Xpii
S0969-9961(10)00059-8journal_volume
38pub_type
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