Structural Characterization and Anti-Inflammatory Activity of a Bioactive Polysaccharide from Cistanche deserticola

Area of Science:

• Natural Product Chemistry
• Immunology
• Metabolomics

Background:

• Cistanche deserticola is a traditional medicinal herb.
• Polysaccharides are known for their diverse biological activities.
• Inflammation is a complex biological response implicated in various diseases.

Purpose of the Study:

• To isolate and characterize a bioactive polysaccharide (CDP-D1) from Cistanche deserticola.
• To investigate the anti-inflammatory effects of CDP-D1 in lipopolysaccharide (LPS)-stimulated macrophages.
• To explore the underlying mechanisms, including metabolic reprogramming.

Main Methods:

• Isolation and purification of CDP-D1 using DEAE anion-exchange chromatography.
• Structural and molecular characterization using GC-MS and NMR.
• In vitro anti-inflammatory assays in RAW264.7 macrophages stimulated with LPS.
• Metabolomic analysis using PLS-DA to assess metabolic changes.

Main Results:

• CDP-D1 was identified as a heteropolysaccharide (142.52 kDa) with high purity.
• CDP-D1 significantly restored cell viability and suppressed pro-inflammatory mediators (TLR4, IL-1, IL-6, TNF-α) in LPS-treated macrophages.
• CDP-D1 reversed LPS-induced metabolic suppression, particularly in glutathione and amino acid metabolism, restoring homeostasis.

Conclusions:

• CDP-D1 exhibits significant anti-inflammatory properties in macrophages.
• The protective effects may involve the regulation of oxidative stress and metabolic reprogramming.
• CDP-D1 represents a promising therapeutic candidate for inflammatory conditions, warranting further mechanistic studies.