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XIII International Symposium Heart Failure & Co. New perspectives in the therapy with PPAR- γ agonists. Carlo Maria Rotella, Ilaria Dicembrini. Napoli, 12-13 aprile 2013. Properties of PPAR- γ. PPAR- γ ligands. Adverse events associated with PPAR- γ agonists. - PowerPoint PPT Presentation
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New perspectives in the therapy with
PPAR-γ agonists.
Carlo Maria Rotella, Ilaria Dicembrini
Napoli, 12-13 aprile 2013
XIII International Symposium Heart Failure & Co.
Properties of PPAR-γ
PPAR-γ ligands
Adverse events associated with PPAR-γ agonists
• Chronic heart failure/oedema and fluid retention Increasing sodium retention and plasma volume expansion due to PPAR-γ in the epithelium of the renal
collecting ducts Act synergistically with insulin to increase sympathetic nervous activity, which causes arterial vasodilation
leading to sodium retention Change in endothelial permeability leading to extracellular fluid increase Similarity in thiazolidinediones to the dihyrdopyridine type of calcium-channel blockers, which exert their
effect through L-type calcium channels and cause increased fluid permeability
• Weight gain Redistribution of fat from central to peripheral sites Adipocyte hyperplasia, fluid retention and decreased glycosuria Genetic factors
• Bone fractures Associated with a loss of bone density Decreased osteoblast differentiation: PPAR-γ signals preferential differentiation of mesenchymal cells to
adipocytes rather than osteoblasts, thereby reducing bone formation and mass Increased osteoclast formation
Reported meta-analysis about the effct of TZD on cardiovascular risk in type 2 Diabetes
Pioglitazone like a partial PPAR-α agonist in vitro
PPAR- γ independent mechanisms:Cardiomycocytes protective effects induced by
Pioglitazone
PPAR- α dependent mechanisms:Cardiomycocytes protective effects
induced by PioglitazonePioglitazone limits myocardial infarct size, activates Akt, and upregulates cPLA2 and COX-2 in a PPAR-γ-independent manner.
Basic Res Cardiol. 2011;106(3):431-46.
Pioglitazone-treated animalsControl animals
Hippocampus
Temporal Cortex
PPAR-γ ligands & Sepsis
On a mouse model of sepsis induced by a bacterial endotoxin , PPAR-γ like a anti-inflammatory mediator by inhibiting early and late proinflammatory cytokines such as TNF-α, IL-6, iNOS, and HMGB1.
Pioglitazone and Bladder cancer
PPAR-γ ligands & Cancer
1. Cell growth and proliferation
2. Inflammatory pathways
3. TGF-β pathway
EMT= epithelial mesenchymal transition
A.K. Reka et al. Lung Cancer 72 (2011) 154–159
4. Prevent cytoxicity induced by platinum drugs, 5. Synergy with cisplatin and paclitaxel, 6. Facilitation of the epidermal growth factor receptor signaling (gefitinib), 7.Potentiation of HDAC inhibitor (phenylbutirate)
PPAR-γ ligands & Cancer
A.K. Reka et al. Lung Cancer 72 (2011) 154–159
PPAR-γ agonists & Cancer
Retrospective analysis of more than 80.000 TZD users compared to nonusers after adjusting for confounding variables:
33% reduction in lung cancer risk.
Conclusions