Kilka badan na ludziach (zadne nie wykazalo kancerogennosci):
Phase 4 trial (Clinical trials id NCT00841217)
This was a double-blind randomised crossover trial of 6 week intervention periods to determine whether PPAR-delta agonists (GW5015156) had favorable effects on lipoprotein metabolism (2.5 mg/day).
This clinical trial was conducted in Australia (April 2003 to December 2008). The authors concluded that GW501516 increased the hepatic removal of VLDL particles, which might have resulted from decreased apoC-III concentration. GW501516 increased apoA-II production, resulting in an increased concentration of LpA-I: A-II particles. This study elucidates the mechanism of action of this PPARδ agonist on lipoprotein metabolism and supports its potential use in treating dyslipidemia in obesity. All these results were achieved without any significant alteration in body weight or insulin resistance. No adverse events were observed [6]
Eric J. Olson et al., (2012) [7]
Cardarine (GW501516) (2.5, 5.0, or 10.0 mg) or placebo was given for 12 weeks to patients (n=268) with high-density lipoprotein (HDL) cholesterol <1.16 mmol/L. Fasting lipids/apolipoproteins (apos), insulin, glucose, and free fatty acid were measured; changes from baseline were calculated and assessed. A second smaller exploratory study (n=37) in a similar population was conducted using a sequence of 5 and 10 mg dosing for the assessment of lipoprotein particle concentration. GW501516 produced significant changes in HDL cholesterol, LDL cholesterol, apoA1, and apoB. Fewer very LDL and larger LDL support a transition toward less atherogenic lipoprotein profiles. The doses used were found to be safe with regard to safety outcomes assessed.
Dennis L. Sprecher et al., (2007)
[8] Healthy volunteers were allocated placebo (n=6) or PPARδ agonist (GW501516) at 2.5 mg (n=9) or 10 mg (n=9), orally, once-daily for 2 weeks while hospitalised and sedentary. Standard lipid/lipoproteins were measured and in vivo fat feeding studies were conducted. Human skeletal muscle cells were treated with GW501516 in vivo and evaluated for lipid-related gene expression and fatty acid oxidation (FAO). Serum TG trended downwards (P=0.08, 10 mg), whereas TG clearance post fat-feeding improved with drug (P=0.02). HDLc was enhanced in both treatment groups (2.5 mg P=0.004, 10 mg P<0.001) when compared with the decrease in the placebo group (−11.5±1.6%, P=0.002). These findings complimented in vivo cell culture results whereby GW501516 induced FAO and upregulated CPT1 and CD36 expression. No adverse events were identified.
Elizabeth E. Girroir et al., (2007) [13]
Girroir et al., 2007 examined the effect of ligand activation of PPARδ on cell growth of two human cancer cell lines, MCF7 (breast cancer) and UACC903 (melanoma) in the presence or absence of serum using two highly specific PPARδ ligands, GW0742 or cardarine (GW501516). Culturing cells in the presence of either GW0742 or GW501516 caused up-regulation of the known PPARδ target gene angiopoietin-like protein 4 (ANGPTL4). Inhibition of cell growth was observed in both cell lines cultured in the presence of either GW0742 or GW501516, and the presence or absence of serum had little influence on this inhibition. The authors concluded that ligand activation of PPARδ inhibits the growth of both MCF7 and UACC903 cell lines and provide further evidence that PPARδ ligands are not mitogenic in human cancer cell lines.
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