Lignans from Sambucus williamsii Protect Bone Via Microbiome

Area of Science:

• Integrative Medicine
• Microbiome Research
• Pharmacology

Background:

• Traditional Chinese Medicine offers unique approaches to bone diseases like osteoporosis.
• Sambucus williamsii Hance (SWH) shows bone-protective effects in preclinical models.
• Lignans are identified as key bioactive compounds in SWH, but their low serum levels pose a challenge.

Purpose of the Study:

• To investigate the mechanism behind the bone-protective effects of SWH lignans.
• To explore the potential role of the gut microbiome in mediating SWH's action.
• To identify specific microbial pathways or metabolites involved in bone health.

Main Methods:

• Administered lignan-rich fraction of SWH to ovariectomized (OVX) rats.
• Analyzed gut microbiota composition and diversity.
• Conducted metabolomic studies to identify key metabolites, including serotonin.

Main Results:

• SWH lignans did not alter overall gut microbiota diversity but increased specific beneficial genera correlated with bone mineral density (BMD).
• Gut-derived serotonin levels were implicated in mediating the bone-protective effects.
• Identified lignan-derived inhibitors of serotonin synthesis within SWH.

Conclusions:

• The gut microbiome is essential for SWH lignans to exert bone-beneficial effects.
• Modulation of gut microbiota and serotonin pathways by SWH contributes to bone health.
• Findings suggest a novel therapeutic strategy targeting the gut-microbiome-bone axis.