Traditional Chinese medicines with caspase-inhibitory activity

Area of Science:

• Neuroscience
• Pharmacology
• Traditional Chinese Medicine

Background:

• Clinical evidence suggests Traditional Chinese Medicine (TCM) drugs reduce stroke-related brain damage.
• The molecular mechanisms underlying the neuroprotective effects of TCM in stroke remain largely unknown.
• Neuronal loss in ischemic stroke is linked to cell death programs, particularly caspase activation during reperfusion.

Purpose of the Study:

• To screen commonly used TCM drugs for neuroprotective activity relevant to stroke therapy.
• To investigate the caspase inhibitory potential of TCM extracts.
• To identify specific TCM compounds that modulate caspase activity.

Main Methods:

• A collection of 58 TCM drugs used in stroke therapy was screened.
• Nuclear Magnetic Resonance (NMR) and fluorescence assays were employed.
• Aqueous extracts were tested for caspase inhibitory activity.

Main Results:

• Aqueous extracts of Lianqiao (Fructus Forsythiae) and Shouwuteng (Caulis Polygoni multiflori) demonstrated significant caspase inhibitory activity.
• These extracts effectively blocked the activity of initiator caspase-8 and effector caspases-3 and -7.
• Inhibition occurred in a dose-dependent manner with an IC(50) of less than 10 microg/ml.

Conclusions:

• Lianqiao and Shouwuteng possess caspase inhibitory properties, suggesting a molecular basis for their neuroprotective effects in stroke.
• This finding facilitates the development of testable hypotheses for further research into TCM stroke therapies.
• Further investigation is warranted to elucidate the precise mechanisms of TCM in stroke treatment.