A New Mechanism for Ginsenoside Rb1 to Promote Glucose Uptake, Regulating Riboflavin Metabolism and Redox Homeostasis

Area of Science:

• Metabolic regulation
• Nutraceutical science
• Pharmacology

Background:

• Glucose absorption promoters mimic insulin, enhancing glucose transport and consumption.
• American ginseng (Panax quinquefolius L.) saponins show potential for improving glucose uptake and stabilizing postprandial blood glucose.
• Identifying key active components and their mechanisms is crucial for developing effective glucose-lowering agents.

Purpose of the Study:

• To identify active components in American ginseng that promote glucose uptake.
• To elucidate the metabolic mechanisms underlying ginsenoside Rb1 (GRb1)-mediated glucose transport.
• To investigate GRb1's role in regulating redox homeostasis and its molecular targets.

Main Methods:

• Bio-guided isolation using zebrafish larvae and 2-NBDG indicator for activity screening.
• Ultra-Performance Liquid Chromatography-Quadrupole Time-of-Flight tandem Mass Spectrometry (UPLC-QTOF-MS/MS) for component identification.
• Reverse Transcription quantitative Polymerase Chain Reaction (RT-qPCR) and phenotypic verification to confirm mechanisms.

Main Results:

• Ginsenoside Rb1 (GRb1) was identified as the most potent promoter of glucose uptake.
• GRb1 facilitates glucose transport by modulating riboflavin metabolism.
• GRb1 restores redox homeostasis by targeting riboflavin transporters (SLC52A1, SLC52A3) and riboflavin kinase (RFK).

Conclusions:

• Ginsenoside Rb1 (GRb1) from American ginseng effectively promotes glucose uptake.
• Riboflavin metabolism serves as a key regulatory pathway for GRb1-induced glucose transport.
• GRb1's mechanism involves targeting specific riboflavin transporters and kinases, impacting redox balance and glucose homeostasis.