Rosiglitazone counteracts palmitate-induced beta-cell dysfunction by suppression of MAP kinase, inducible nitric oxide synthase and caspase 3 activities.

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

Abstract

Chronic exposure of pancreatic islets to elevated levels of palmitate leads to beta-cell dysfunction. We examined possible involvement of mitogenactivated protein kinases (MAPKs) and caspase-3 in palmitate-induced beta-cell dysfunction and tested the influence of the anti-diabetic drug rosiglitazone (ROZ). Palmitate amplified glucose-stimulated augmentation of intracellular free calcium ([Ca(2+)](i)) and insulin secretion in incubated islets. ROZ suppressed this amplification, whereas it modestly augmented glucose-induced increase in these events. ROZ suppressed short-term palmitate-induced phosphorylation of pro-apoptotic MAPKs, i.e., SAPK/JNK and p38. Long-term islet culturing with palmitate induced inducible nitric oxide synthase (iNOS) and activated SAPK/JNK-p38. ROZ counteracted these effects. Both palmitate and cytokines activated caspase-3 in MIN6c4-cells and isolated islets. ROZ suppressed palmitate- but not cytokine-induced caspase-3 activation. Finally, after palmitate culturing, ROZ reversed the inhibitory effect on glucose-stimulated insulin release. We suggest that ROZ counteracts palmitateinduced deleterious effects on beta-cell function via suppression of iNOS, pro-apoptotic MAPKs and caspase-3 activities, as evidenced by restoration of glucose-stimulated insulin release.

Detaljer

Författare
Forskningsområden

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Cellbiologi
Originalspråkengelska
Sidor (från-till)2256-2265
TidskriftCellular and Molecular Life Sciences
Volym65
Utgivningsnummer14
StatusPublished - 2008
PublikationskategoriForskning
Peer review utfördJa

Relaterad forskningsoutput

Meidute, S., 2008, Department of Clinical Sciences, Lund University. 146 s.

Forskningsoutput: AvhandlingDoktorsavhandling (sammanläggning)

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