Clusterin/apolipoprotein J is a novel biomarker of cellular senescence that does not affect the proliferative capacity of human diploid fibroblasts (Journal article)

Petropoulou, C./ Trougakos, I. P./ Kolettas, E./ Toussaint, O./ Gonos, E. S.

Normal human fibroblasts have a limited replicative potential in culture and eventually reach a state of irreversible growth arrest, termed senescence. In a previous study aiming to identify genes that are differentially regulated during cellular senescence we have cloned clusterin/apolipoprotein J (Apo J), a 80 kDa secreted glycoprotein. In the current report we pursue our studies and show that senescence of human diploid fibroblasts is accompanied by up-regulation of both Apo J mRNA and protein levels, but with no altered biogenesis, binding partner profile or intracellular distribution of the two Apo J forms detected. To analyze the causal relationship between senescence and Apo J protein accumulation, we stably overexpressed the Apo J gene in primary as well as in SV40 T antigen-immortalized human fibroblasts and we showed no alteration of the proliferative capacity of the transduced cells. Despite previous reports on tumor-derived cell lines, overexpression of Apo J in human fibroblasts did not provide protection against apoptosis or growth arrest induced by hydrogen peroxide. Overall, our results suggest that Apo J overexpression does not induce senescence but it is rather a secondary consequence of the senescence phenotype. To our knowledge this is the first report that provides a functional analysis of human Apo J during replicative senescence.
Institution and School/Department of submitter: Πανεπιστήμιο Ιωαννίνων. Σχολή Επιστημών Υγείας. Τμήμα Ιατρικής
Keywords: Antigens, Differentiation/biosynthesis/genetics/*isolation & purification,Cell Aging/*physiology,Clusterin,Diploidy,Fibroblasts/cytology/*physiology,Glycoproteins/biosynthesis/genetics/*isolation & purification,Humans,Molecular Chaperones/biosynthesis/genetics/*isolation & purification,Oxidative Stress/physiology,Recombinant Proteins/biosynthesis,Up-Regulation
ISSN: 0014-5793
Appears in Collections:Άρθρα σε επιστημονικά περιοδικά ( Ανοικτά)

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