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Phenolic Compounds Inhibit 3T3-L1 Adipogenesis Depending on the Stage of Differentiation and Their Binding Affinity
Paula Aranaz1, David Navarro-Herrera2,3, María Zabala4
1Centre for Nutrition Research, University of Navarra, Irunlarrea 1, 31008 Pamplona, Spain. paranaz@unav.es.
Abstract:
Phenolic compounds might modulate adiposity. Here, we report our observation that polyphenols and phenolic acids inhibit adipogenesis in 3T3-L1 with different intensity depending on the family and the stage of differentiation. While quercetin and resveratrol inhibited lipid accumulation along the whole process of differentiation, apigenin and myricetin were active during the early and latest stages, but not intermediate, contrary to hesperidin. The activity of phenolic acids was limited to the early stages of the differentiation process, except p-coumaric and ellagic acids. This anti-adipogenic effect was accompanied by down-regulation of Scd1 and Lpl. Molecular docking analysis revealed that the inhibitory activity of these phenolic compounds over the early stages of adipogenesis exhibits a significant correlation (r = 0.7034; p = 0.005) with their binding affinity to the ligand-binding domain of PPARγ. Results show that polyphenols and phenolic acids would interact with specific residues of the receptor, which could determine their potential anti-adipogenic activity during the early stages of the differentiation. Residues Phe264, His266, Ile281, Cys285 and Met348 are the most frequently involved in these interactions, which might suggest a crucial role for these amino acids modulating the activity of the receptor. These data contribute to elucidate the possible mechanisms of phenolic compounds in the control of adipogenesis.
Insights
Polyphenols and phenolic acids inhibit fat cell formation (adipogenesis) in a stage-dependent manner. Their anti-adipogenic effects correlate with binding to PPARγ, suggesting a mechanism for controlling adiposity.
Area of Science:
- Biochemistry
- Cell Biology
- Nutritional Science
Background:
- Phenolic compounds are plant-derived molecules with potential health benefits.
- Adipogenesis, the process of fat cell formation, is a complex pathway implicated in metabolic disorders.
- Understanding how dietary compounds influence adipogenesis is crucial for developing strategies to manage obesity.
Purpose of the Study:
- To investigate the inhibitory effects of various polyphenols and phenolic acids on adipogenesis in 3T3-L1 cells.
- To determine the stage-specific activity of these compounds during fat cell differentiation.
- To elucidate the molecular mechanisms underlying their anti-adipogenic potential, focusing on interactions with PPARγ.
Main Methods:
- 3T3-L1 cells were used to model adipogenesis.
- Lipid accumulation was quantified to assess anti-adipogenic effects.
- Gene expression analysis (Scd1, Lpl) was performed.
- Molecular docking simulations were employed to predict binding affinities to PPARγ.
Main Results:
- Polyphenols and phenolic acids exhibited varying degrees of inhibition on adipogenesis, dependent on their chemical structure and the differentiation stage.
- Quercetin and resveratrol inhibited lipid accumulation throughout differentiation, while others showed stage-specific effects.
- Anti-adipogenic activity correlated significantly with binding affinity to the ligand-binding domain of PPARγ.
- Key amino acid residues (Phe264, His266, Ile281, Cys285, Met348) in PPARγ were identified as crucial for these interactions.
Conclusions:
- Phenolic compounds can modulate adipogenesis through distinct mechanisms.
- The interaction with specific residues of PPARγ is a key factor in the early-stage inhibition of adipogenesis by these compounds.
- These findings provide insights into the potential of dietary phenolics for controlling fat cell development and managing metabolic health.
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