Citrus flavanone metabolites protect pancreatic β-cells against cholesterol stress through a multi-proteomic...

Area of Science:

• Metabolomics
• Proteomics
• Cell Biology

Background:

• Western diets can induce oxidative stress and insulin resistance, impacting pancreatic beta-cell function.
• Citrus flavanones show potential for mitigating these effects, but their impact on protein expression is not well understood.

Purpose of the Study:

• To investigate the protective effects and molecular mechanisms of citrus flavanone metabolites, hesperetin 7-glucuronide (H7G) and 3-(4'-hydroxyphenyl) propanoic acid (PA), on pancreatic beta-cells under cholesterol-induced oxidative stress.
• To utilize global proteomics to analyze changes in protein expression profiles.

Main Methods:

• Pancreatic beta-cell line (Min6) was exposed to cholesterol to induce oxidative stress.
• Proteomics analysis was performed on cells treated with H7G and PA.
• Bioinformatics and molecular docking were used to analyze differentially expressed proteins and potential molecular targets.

Main Results:

• Cholesterol induced significant changes in the proteomic profile of Min6 cells.
• H7G and PA treatments resulted in differential expression of 254 and 352 proteins, respectively, largely counteracting cholesterol-induced changes.
• Affected proteins are involved in crucial pathways including insulin signaling, MAPK signaling, glucokinase and glutathione metabolism, and inflammatory responses (TNF-α, NF-κB).
• Molecular docking suggested H7G and PA bind to transcription factors (PPAR-γ, STAT-3, CREB1, NF-κB, NFYA) and signaling proteins (IKK, RAS, Pi3K, ERK).

Conclusions:

• Hesperetin 7-glucuronide (H7G) and 3-(4'-hydroxyphenyl) propanoic acid (PA) protect pancreatic beta-cells against cholesterol-induced stress.
• These protective effects are mediated through multi-proteomic mechanisms involving modulation of key cellular pathways.