Identification of potential inflammatory inhibitors from Aster tataricus

Area of Science:

• Phytochemistry
• Immunology
• Pharmacology

Background:

• Aster tataricus L.f. is a traditional Eastern Asian herb used for cough remedies.
• Its roots contain numerous known compounds and novel monoterpene glycosides.

Purpose of the Study:

• To isolate and characterize compounds from A. tataricus roots.
• To investigate the anti-inflammatory potential of these compounds.

Main Methods:

• Compound isolation using spectroscopic techniques.
• In vitro assays on lipopolysaccharide-activated RAW264.7 cells.
• Analysis of nitric oxide (NO) and inflammatory cytokine production.
• Western blot analysis for inflammatory enzyme and signaling pathway activation.

Main Results:

• Two novel monoterpene glycosides and 32 known compounds were identified.
• Compound 7 demonstrated potent inhibition of NO secretion (IC50 = 8.5 µM).
• Compound 7 suppressed prostaglandin E2, interleukin-6, and interleukin-1 beta.
• It inhibited inducible nitric oxide synthase and cyclooxygenase-2 expression via nuclear factor-kappa B (NF-κB) pathway.
• Compound 7 also inhibited mitogen-activated protein kinase (MAPK) signaling.

Conclusions:

• Compound 7 possesses significant anti-inflammatory properties.
• It acts by inhibiting NF-κB and MAPK pathways.
• Compound 7 is a potential therapeutic agent for inflammatory diseases such as atopic dermatitis, asthma, and allergies.