ENGL.: BACKGROUND: Metabolic syndrome (MetS) appears closely linked with ceramide accumulation inducing insulin resistance and toxicity to multiple cell types. Animal studies demonstrate that thiazolidinediones (TZDs) reduce ceramide concentrations in plasma and skeletal muscle and support lowering of ceramide levels as a potential mediator of TZDs' mechanism of action in reducing insulin resistance; however, studies in humans have yet to be reported. This study investigated the effects of pioglitazone therapy on plasma ceramides to understand the mechanism by which TZDs improve insulin resistance in MetS.
ENGL: METHODS: 37 subjects with MetS were studied in a single-center, randomized, double-blind, placebo-controlled, trial comparing pioglitazone to placebo. Data were collected at baseline and after 6 months of therapy. The primary endpoint was the change from baseline in plasma ceramide concentrations.
RESULTS: Treatment with pioglitazone for 6 months, compared to placebo, significantly reduced multiple plasma ceramide concentrations: C18:0 (p = .001), C20:0 (p = .0004), C24:1 (p = .009), dihydroceramide C18:0 (p = .005), dihydroceramide C24:1 (p = .004), lactosylceramide C16:0 (p = .02) and the hexosylceramides C16:0 (p = .0003), C18:0 (p = 0.00001), C22:0 (p = .00002) and C24:1 (p = .0006). Additionally, significant reductions were found when ceramides were grouped by species: ceramides (p = .03), dihydroceramides (p = .02), hexosylceramides (p = .00001), and lactosylceramides (p = .02). The total of all measured ceramides was also significantly reduced (p = .001). Following treatment with pioglitazone, the decrease in some ceramide species correlated negatively with the change in insulin sensitivity (dihydroceramide C16:0, r = -.54; p = .02), and positively with total (lactosylceramide C24:0, r = .53; p = .02) and high molecular weight (lactosylceramide C24:0, r = .48; p = .05) adiponectin measurements; however, significant associations with changes in liver fat and glycemic control reduction were not found.
CONCLUSIONS: Pioglitazone in individuals with MetS induces a potent decrease in plasma ceramides, and some of the changes correlate with changes in insulin resistance and adiponectin levels. This article is protected by copyright. All rights reserved.
- PMID:
- 25959529
- [PubMed - as supplied by publisher] Suomennos 14.5. 2015)
LÄHDE: Diabetes Metab Res Rev. 2015 May 10. doi: 10.1002/dmrr.2662. [Epub ahead of print]
Effect of pioglitazone on plasma ceramides in adults with metabolic syndrome.
Warshauer JT1, Lopez X1, Gordillo R1, Hicks J1, Holland WL1, Anuwe E1, Blankfard MB2, Scherer PE1, Lingvay I1.
Inga kommentarer:
Skicka en kommentar