A Combination of Plant-Derived Extracts Modulates Nutrient-Responsive Metabolic Signalling in an In Vitro...

Area of Science:

• Metabolic research
• Pharmacology
• In vitro modeling

Background:

• Glucagon-like peptide-1 (GLP-1) is key for metabolic regulation across gut, liver, and adipose tissues.
• Limited mechanistic data exists for plant extracts' integrated metabolic effects.
• Investigating plant extracts' molecular impact on multiple metabolic systems is crucial.

Purpose of the Study:

• To explore the molecular effects of a plant extract combination (Gastrodia elata, Morus alba, Paeonia lactiflora) using an integrated in vitro gut-liver-adipose model.
• To assess the impact of these extracts on GLP-1 secretion and epithelial integrity.
• To evaluate downstream metabolic signaling pathways in hepatocytes and adipocytes.

Main Methods:

• Utilized differentiated Caco-2 cells to assess GLP-1 secretion and barrier function upon extract exposure.
• Employed HepG2 hepatocytes exposed to intestinal cell-conditioned media to analyze lipid metabolism.
• Used 3T3-L1 adipocytes exposed to hepatic cell-conditioned media to evaluate lipid accumulation and signaling.

Main Results:

• The plant extract combination significantly increased GLP-1 secretion from intestinal cells without compromising barrier integrity.
• Hepatocytes showed reduced triglyceride levels and modulated lipid handling markers (e.g., resistin, FGF21, SREBP-1c, AMPK, SIRT1).
• Adipocytes exhibited decreased lipid accumulation and enhanced browning markers (e.g., UCP1, SIRT1, STAT3).

Conclusions:

• The tested plant extract combination modulates GLP-1-associated metabolic signaling pathways across intestinal, hepatic, and adipose systems in vitro.
• Findings suggest potential mechanistic roles for these extracts in metabolic regulation.
• Further in vivo and clinical studies are warranted to validate these hypothesis-generating results.