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Boswellic acids from frankincense inhibit lipopolysaccharide functionality through direct molecular interference.

Arne Henkel¹, Nicole Kather, Bettina Mönch

¹Department for Pharmaceutical Analytics, Pharmaceutical Institute, University of Tuebingen, Germany. adhenkel@gmx.de

Biochemical Pharmacology

|October 18, 2011

Summary

Boswellic acids (BAs) directly inhibit lipopolysaccharide (LPS) functionality, reducing inflammatory responses. This discovery explains the anti-inflammatory effects of Boswellia extracts in infections.

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Isolation and Chemical Characterization of Lipid A from Gram-negative Bacteria

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Area of Science:

Pharmacology
Natural Products Chemistry
Immunology

Background:

Lipophilic extracts of Boswellia species (BSE) are traditionally used for inflammatory conditions.
The precise molecular mechanisms underlying BSE's therapeutic effects remain largely unknown.
Boswellic acids (BAs) are key bioactive components identified in BSE.

Purpose of the Study:

To investigate the direct inhibitory effects of defined boswellic acids (BAs) on lipopolysaccharide (LPS) and its induced cellular responses.
To elucidate the molecular interactions between BAs and LPS.
To establish structure-activity relationships for BA inhibition of LPS.

Main Methods:

Pull-down assays to detect direct binding between immobilized BAs and LPS.
Modified Limulus Amebocyte Lysate (LAL) assay to quantify LPS inhibitory activity of BAs in vitro.
Assessment of LPS-induced inducible nitric oxide synthase (iNOS) expression in RAW264.7 cells.

Main Results:

Defined BAs directly bind to LPS, inhibiting its biological activity.
Beta-boswellic acid demonstrated the most potent inhibition with an IC50 of 1.8 μM.
BAs selectively inhibited LPS-induced iNOS expression in RAW264.7 cells, but not interferon-γ-induced iNOS.

Conclusions:

Structurally defined boswellic acids function as direct inhibitors of lipopolysaccharide.
Beta-boswellic acid's potent LPS inhibitory activity suggests its significant contribution to the anti-inflammatory properties of Boswellia extracts during infections.