Differential influence of tacrolimus and sirolimus on mitochondrial-dependent signaling for apoptosis in pancreatic cells.
Fiche publication
Date publication
juillet 2016
Journal
Molecular and cellular biochemistry
Auteurs
Membres identifiés du Cancéropôle Est :
Pr SCHINI-KERTH Valérie
Tous les auteurs :
Constantinescu AA, Abbas M, Kassem M, Gleizes C, Kreutter G, Schini-Kerth V, Mitrea IL, Toti F, Kessler L
Lien Pubmed
Résumé
To examine and compare the mitochondria-related cellular mechanisms by which tacrolimus (TAC) or sirolimus (SIR) immunosuppressive drugs alter the pancreatic exocrine and endocrine β-cell fate. Human exocrine PANC-1 and rat endocrine insulin-secreting RIN-m5F cells and isolated rat islets were submitted to 1-100 nM TAC or SIR. In cultures, insulin secretion was measured as endocrine cell function marker. Apoptosis was quantified by annexin 5 and propidium iodide staining. Cleaved caspase-3, Bax apoptosis indicators, and p53, p21 cell cycle regulators were detected by Western blot. Cell cycle and mitochondrial membrane potential (ΔΨm) were analyzed by flow cytometry and SA-beta-galactosidase (SA-β-gal) activity by fluorescence microscopy. Only TAC reduced insulin secretion by RIN-m5F after 24 h. TAC and SIR promoted moderate apoptosis in both PANC-1 and RIN-m5F after 24 h. Apoptosis was associated with up-regulated Bax (threefold) and cleaved caspase-3 (fivefold) but only in PANC-1, while p53 and p21 were up-regulated (twofold) in both cell lines. ΔΨm was impaired only in PANC-1 by TAC and SIR. Only SIR prompted cell cycle arrest in both cell lines. The induction of a premature senescence-like phenotype was confirmed in isolated islets by SA-β-gal activity. TAC and SIR are early inducers of pancreatic cell dysfunction and apoptosis but differentially alter endocrine and exocrine cells via mitochondrial-driven pathways. In rat islets, TAC and SIR prompt a senescence-like phenotype.
Mots clés
Animals, Apoptosis, drug effects, Cell Line, Humans, Insulin-Secreting Cells, metabolism, Membrane Potential, Mitochondrial, drug effects, Mitochondria, metabolism, Pancreas, Exocrine, metabolism, Rats, Signal Transduction, drug effects, Sirolimus, pharmacology, Tacrolimus, pharmacology
Référence
Mol. Cell. Biochem.. 2016 Jul;418(1-2):91-102