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Rostambeigi 2011 Transplantation

From Bioblast
Publications in the MiPMap
Rostambeigi N, Lanza IR, Dzeja PP, Deeds MC, Irving BA, Reddi HV, Madde P, Zhang S, Asmann YW, Anderson JM, Schimke JM, Nair KS, Eberhardt NL, Kudva YC. (2011) Unique cellular and mitochondrial defects mediate FK506-induced islet Ξ²-cell dysfunction. Transplantation 91(6):615-623.

Β» PMID:21200364

Rostambeigi N, Lanza IR, Dzeja PP, Deeds MC, Irving BA, Reddi HV, Madde P, Zhang S, Asmann YW, Anderson JM, Schimke JM, Nair KS, Eberhardt NL, Kudva YC (2011) Transplantation

Abstract: OBJECTIVE: To determine biological mechanisms involved in posttransplantation diabetes mellitus caused by the immunosuppressant tacrolimus (FK506).

METHODS: INS-1 cells and isolated rat islets were incubated with vehicle or FK506 and harvested at 24-hr intervals. Cells were assessed for viability, apoptosis, proliferation, cell insulin secretion, and content. Gene expression studies by microarray analysis, quantitative polymerase chain reaction, and motifADE analysis of the microarray data identified potential FK506-mediated pathways and regulatory motifs. Mitochondrial functions, including cell respiration, mitochondrial content, and bioenergetics were assessed.

RESULTS: Cell replication, viability, insulin secretion, oxygen consumption, and mitochondrial content were decreased (P<0.05) 1.2-, 1.27-, 1.77-, 1.32-, and 1.43-fold, respectively, after 48-hr FK506 treatment. Differences increased with time. FK506 (50 ng/mL) and cyclosporine A (800 ng/mL) had comparable effects. FK506 significantly decreased mitochondrial content and mitochondrial bioenergetics and showed a trend toward decreased oxygen consumption in isolated islets. Cell apoptosis and proliferation, mitochondrial DNA copy number, and ATP:ADP ratios were not significantly affected. Pathway analysis of microarray data showed FK506 modification of pathways involving ATP metabolism, membrane trafficking, and cytoskeleton remodeling. PGC1-Ξ± mRNA was down-regulated by FK506. MotifADE identified nuclear factor of activated T-cells, an important mediator of Ξ²-cell survival and function, as a potential factor mediating both up- and down-regulation of gene expression.

CONCLUSIONS: At pharmacologically relevant concentrations, FK506 decreases insulin secretion and reduces mitochondrial density and function without changing apoptosis rates, suggesting that posttransplantation diabetes induced by FK506 may be mediated by its effects on mitochondrial function. β€’ Keywords: FK506, islet toxicity, mitochondrial density, mitochondrial DNA, insulin secretion, motifADE.

β€’ O2k-Network Lab: US_MN Rochester_Nair K


Labels:


Organism: Rat  Tissue;cell: Islet Cell; Pancreas; Thymus"Islet Cell; Pancreas; Thymus" is not in the list (Heart, Skeletal muscle, Nervous system, Liver, Kidney, Lung;gill, Islet cell;pancreas;thymus, Endothelial;epithelial;mesothelial cell, Blood cells, Fat, ...) of allowed values for the "Tissue and cell" property.  Preparation: Intact Cell; Cultured; Primary"Intact Cell; Cultured; Primary" is not in the list (Intact organism, Intact organ, Permeabilized cells, Permeabilized tissue, Homogenate, Isolated mitochondria, SMP, Chloroplasts, Enzyme, Oxidase;biochemical oxidation, ...) of allowed values for the "Preparation" property. 

Regulation: ATP; ADP; AMP; PCr"ATP; ADP; AMP; PCr" is not in the list (Aerobic glycolysis, ADP, ATP, ATP production, AMP, Calcium, Coupling efficiency;uncoupling, Cyt c, Flux control, Inhibitor, ...) of allowed values for the "Respiration and regulation" property. 


HRR: Oxygraph-2k