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Published on: February 3, 2023
Anthocyanidins-enriched bilberry extracts inhibit 3T3-L1 adipocyte differentiation via the insulin pathway
Rieko Suzuki1, Masami Tanaka1, Masakatsu Takanashi1
1Department of Molecular Pathology, Tokyo Medical University, Tokyo, Japan.
Background:
Obesity and metabolic syndrome are important public concerns, and there is increasing demand for effective therapeutic strategies. Flavonoids are expected to improve the risk factors associated with metabolic syndrome. Anthocyanidins are a kind of flavonoids; well known for their anti-oxidative, anti-inflammatory and anti-tumor properties. However, their effects on adipocytes and molecular systems are not well defined. In this study, we examined the effects of anthocyanidins-enriched bilberry extracts on adipocyte differentiation.
Methods:
Utilizing 3T3-L1 cell line, we investigated that bilberry extracts and anthocyanidins induced inhibition of lipid accumulation during adipogenesis. To identify what is the most important bilberry mediated-effect, we analyzed the expressions of key transcriptional factors associated with adipocyte differentiation by Real Time (RT)-PCR. From the results of RT-PCR, we hypothesized that bilberry extracts and anthocyanidins blocks insulin signal, we determined the phosphorylation of tyrosine residues of insulin receptor substrate 1 (IRS1) protein by western blotting analysis. In addition, we compared the whole-genome expression profiles of early stage of adipocyte differentiation under four different growth conditions (DMSO, bilberry, two anthocyanidins) by microarray analyses and Gene Set Enrichment Analysis (GSEA).
Results:
Exposure to bilberry extracts and anthocyanidins during adipocyte differentiation inhibited 3T3-L1 differentiation. During this period, bilberry extracts and anthocyanidin significantly decreased a key adipocyte differentiation-associated marker, peroxisome proliferator-activated receptor- γ (Ppar γ ) and sterol regulatory element-binding protein 1c (Srebp1c). Western blotting analysis showed that bilberry extracts and anthocyanidin decreased the phosphorylation of tyrosine residues of IRS1. In addition, microarray experiments and GSEA data revealed significantly altered expression of the known genes of the insulin pathway in cells treated with bilberry extracts or anthocyanidins in the early differentiation stages.
Conclusions:
Our data demonstrate that anthocyanidin enriched bilberry extracts strongly inhibit the adipocyte differentiation via the insulin pathway. Furthermore, bilberry extracts might be used as a potential complementary treatment for the obese patients with metabolic syndrome.
Insights
Bilberry extracts rich in anthocyanidins inhibit fat cell differentiation by impacting the insulin pathway. This suggests bilberry may help manage obesity and metabolic syndrome.
Area of Science:
- Biochemistry
- Cell Biology
- Nutritional Science
Background:
- Obesity and metabolic syndrome are significant public health issues requiring effective treatments.
- Flavonoids, particularly anthocyanidins, show potential in mitigating metabolic syndrome risk factors.
- The specific effects of anthocyanidins on adipocytes and molecular pathways require further elucidation.
Purpose of the Study:
- To investigate the impact of anthocyanidin-rich bilberry extracts on adipocyte differentiation.
- To explore the molecular mechanisms by which bilberry extracts influence fat cell development.
- To assess the potential of bilberry extracts as a therapeutic strategy for obesity and metabolic syndrome.
Main Methods:
- Utilized 3T3-L1 cells to study the effects of bilberry extracts and anthocyanidins on adipogenesis.
- Employed Real Time (RT)-PCR to analyze key adipocyte differentiation transcriptional factors.
- Applied Western blotting to assess insulin signaling pathway modulation (IRS1 phosphorylation).
- Conducted microarray and Gene Set Enrichment Analysis (GSEA) to compare whole-genome expression profiles.
Main Results:
- Bilberry extracts and anthocyanidins significantly inhibited 3T3-L1 adipocyte differentiation.
- Key markers of adipocyte differentiation, Pparγ and Srebp1c, were decreased by bilberry treatment.
- Insulin signaling was disrupted, evidenced by reduced IRS1 tyrosine phosphorylation.
- Microarray and GSEA revealed significant alterations in insulin pathway gene expression.
Conclusions:
- Anthocyanidin-rich bilberry extracts effectively inhibit adipocyte differentiation through modulation of the insulin pathway.
- Bilberry extracts demonstrate potential as a complementary therapy for individuals with obesity and metabolic syndrome.
