Isolation and microbial transformation of tea sapogenin from seed pomace of Camellia oleifera with anti-inflammatory effects

Abstract

In the current study, tea saponin, identified as the primary bioactive constituent in seed pomace of Camellia oleifera Abel., was meticulously extracted and hydrolyzed to yield five known sapogenins: 16-O-tiglogycamelliagnin B (a), camelliagnin A (b), 16-O-angeloybarringtogenol C (c), theasapogenol E (d), theasapogenol F (e). Subsequent biotransformation of compound a facilitated the isolation of six novel metabolites (a1−a6). The anti-inflammatory potential of these compounds was assessed using pathogen-associated molecular patterns (PAMPs) and damage-associated molecular patterns molecules (DAMPs)-mediated cellular inflammation models. Notably, compounds b and a2 demonstrated significant inhibitory effects on both lipopolysaccharide (LPS) and high-mobility group box 1 (HMGB1)-induced inflammation, surpassing the efficacy of the standard anti-inflammatory agent, carbenoxolone. Conversely, compounds d, a3, and a6 selectivity targeted endogenous HMGB1-induced inflammation, showcasing a pronounced specificity. These results underscore the therapeutic promise of C. oleifera seed pomace-derived compounds as potent agents for the management of inflammatory diseases triggered by infections and tissue damage.

Keywords

Camellia oleifera / Seed pomace / Tea sapogenin / Microbial transformation / Damage-associated molecular patterns and Pathogen-associated molecular patterns / Anti-inflammatory activity

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Funding

National Nature Science Foundation of China(21302052)

“Program for New Century Excellent Talents in University” awarded to ZHANG Jian(NECT-11-0739)

Postgraduate Research & Practice Innovation Program of Jiangsu Province(SJKY19_0658)

Jiangsu Funding Program for Excellent Postdoctoral Talent, and “ Jiangsu Funding Program for Excellent Postdoctoral Talent” awarded to SHEN Pingping