The effect of a medicinal Chinese herb on platelet function

Area of Science:

• Pharmacology
• Biochemistry
• Cardiovascular Research

Background:

• Platelet aggregation plays a crucial role in thrombosis and cardiovascular diseases.
• Traditional Chinese medicine, including Salvia miltiorrhizae, has been explored for cardiovascular benefits.

Purpose of the Study:

• To investigate the in vitro effects of Injectio Salvia Miltiorrhizae (ISM) on human platelet function.
• To elucidate the underlying molecular mechanisms of ISM's antiplatelet activity.

Main Methods:

• In vitro assays measuring platelet aggregation and serotonin release induced by ADP or epinephrine.
• Analysis of ISM's active component stability (heat, acid, base, proteolysis) and molecular weight.
• Measurement of intracellular cyclic AMP (cAMP) levels in platelets.
• Assessment of ISM's interaction with platelet alpha-adrenergic receptors.

Main Results:

• ISM demonstrated a dose-dependent inhibition of platelet aggregation and serotonin release.
• The antiplatelet effect was observed in both gel-filtered platelets and platelets in plasma.
• The active molecule(s) in ISM were heat-stable, acid/base/proteolysis-resistant, with an approximate molecular weight of 280 Da.
• ISM increased intracellular cAMP levels in platelets without interacting with alpha-adrenergic receptors.

Conclusions:

• ISM inhibits human platelet aggregation and serotonin release.
• The mechanism involves increasing platelet cAMP levels, likely through inhibition of cyclic AMP phosphodiesterase.
• These findings suggest a potential therapeutic mechanism for ISM in managing coronary artery disease.