Involvement of phospholipase A2 pathway for the Indian red scorpion venom-induced augmentation of cardiopulmonary reflexes elicited by phenyldiguanide.
The present study was conducted to examine the role of phospholipase A(2) and prostaglandins in Indian red scorpion (Mesobuthus tamulus; MBT) venom-induced augmentation of cardiopulmonary reflexes elicited by phenyldiguanide (PDG). Trachea, femoral artery and jugular vein were cannulated in urethane anesthetized adult albino rats. The effect of jugular venous injection of PDG on ECG, BP and respiratory activity were recorded. Injection of PDG (10 microg/kg) evoked tachypnea/apnea, bradycardia and hypotension lasting for 60s. After injecting MBT venom (100 microg/kg) for 30 min, the PDG evoked reflex responses were augmented by two times and increased the pulmonary water content in envenomed animals, significantly. The venom-induced augmentation of PDG reflex and the increase in pulmonary water content were blocked in animals pretreated with B(2) kinin receptor antagonist (Hoe 140; 2.32 microg/kg). These responses induced by venom were also blocked by a phospholipase A(2) antagonist (PACOCF(3); 1 mg/kg) and a prostaglandin synthase inhibitor (indomethacin; 10 mg/kg). The observations indicate that the venom-induced responses (augmentation of PDG reflex response and increased pulmonary water content) involve PLA(2)-prostaglandin pathway that is triggered by B(2) kinin receptors to sensitize the receptors located on the vagal C-fibres.
Department of Physiology, Institute of Medical Sciences, Banaras Hindu University, Varanasi 221005, India.
Sadhana
S
Kanoo
Shripad B
SB
Deshpande
D000818:Animals; D001645:Biguanides / Q000494:pharmacology; D001794:Blood Pressure / Q000187:drug effects; D004333:Drug Administration Routes; D004357:Drug Synergism; D004562:Electrocardiography / Q000379:methods; D004791:Enzyme Inhibitors / Q000494:pharmacology; D005260:Female; D006321:Heart / Q000187:drug effects*; D006339:Heart Rate / Q000187:drug effects; D007004:Hypoglycemic Agents / Q000494:pharmacology; D007659:Ketones / Q000494:pharmacology; D054467:Phospholipases A2 / Q000378:metabolism*; D011654:Pulmonary Edema / Q000139:chemically induced; D051381:Rats; D012018:Reflex / Q000187:drug effects*; D012119:Respiration / Q000187:drug effects*; D012604:Scorpion Venoms / Q000494:pharmacology*; D015398:Signal Transduction / Q000187:drug effects*
D001645:Biguanides; D004791:Enzyme Inhibitors; D007004:Hypoglycemic Agents; D007659:Ketones; D012604:Scorpion Venoms; C109341:palmitoyl trifluoromethyl ketone; D054467:Phospholipases A2; C008846:phenyl biguanide