Five matrine-type alkaloids from Sophora tonkinensis.

Area of Science:

• Natural Product Chemistry
• Pharmacology

Background:

• Sophora plants are a source of bioactive alkaloids.
• Matrine is a key representative compound with known bioactivity.
• Inflammation is implicated in various diseases, making anti-inflammatory agents a research focus.

Purpose of the Study:

• To isolate and characterize novel matrine-type alkaloids from Sophora tonkinensis.
• To evaluate the anti-inflammatory potential of isolated compounds.
• To compare the efficacy of novel compounds with matrine.

Main Methods:

• Isolation of alkaloids using chromatographic techniques.
• Structure elucidation via UV, IR, HRESIMS, and NMR spectroscopy.
• Determination of absolute configurations using X-ray diffraction.
• In vitro anti-inflammatory assays using LPS-induced RAW 264.7 macrophages.

Main Results:

• Five matrine-type alkaloids were isolated, including two new compounds (1 and 3) and a new natural product (2).
• Compound 1 exhibited the most potent inhibition of tumor necrosis factor-alpha (TNF-α) and interleukin-6 (IL-6) levels.
• The anti-inflammatory activity of compound 1 was superior to that of matrine.

Conclusions:

• Sophora tonkinensis is a valuable source of bioactive matrine-type alkaloids.
• Compound 1 represents a promising novel anti-inflammatory agent.
• Further investigation into compound 1's mechanism of action is warranted.