Pharmacodynamic studies on Polypodium vulgare (Linn.)

Area of Science:

• Pharmacology
• Herbal Medicine Research

Background:

• Plantago vulgare (PV) is a medicinal herb with traditional uses.
• Understanding the pharmacological properties of PV is crucial for validating its therapeutic applications.

Purpose of the Study:

• To investigate the central nervous system (CNS) effects of an aqueous root extract of P. vulgare (PV).
• To explore the cardiovascular and gastrointestinal activities of PV.
• To determine the receptor interactions underlying PV's pharmacological actions.

Main Methods:

• Administration of PV extract to rodents to assess CNS depressant effects (motor activity, hypnosis, body temperature, pain reaction time).
• Evaluation of anticonvulsant properties against electroshock and pentylenetetrazol-induced seizures.
• Assessment of effects on isolated frog heart and blood pressure/heart rate in anesthetized dogs.
• In vitro studies on rabbit small intestine contractions.
• Pharmacological blockade studies using propranolol.

Main Results:

• PV extract significantly reduced spontaneous motor activity, prolonged pentobarbitone-induced hypnosis, decreased body temperature, and increased pain reaction time.
• PV demonstrated protective effects against seizures induced by electroshock and pentylenetetrazol.
• PV exhibited positive inotropic and chronotropic effects on the frog heart and caused hypotension and tachycardia in dogs, effects blocked by propranolol.
• PV inhibited rabbit small intestine contractions in a dose-dependent manner, an effect also blocked by propranolol.

Conclusions:

• The aqueous root extract of P. vulgare (PV) possesses significant CNS depressant and anticonvulsant properties.
• PV exhibits beta-adrenoceptor agonistic activity, influencing cardiovascular and gastrointestinal functions.
• These findings support the traditional use of P. vulgare and highlight its potential as a source of novel therapeutic agents.