Biomaterial Database

6-Keto-prostaglandin E1 is a potent coronary vasodilator and stimulates a vagal reflex in dogs. 1988

M J Panzenbeck, and T H Hintze, and G Kaley

Department of Physiology, New York Medical College, Valhalla.

These studies were performed to examine the effects of 6-keto-prostaglandin E1 (6-keto-PGE1) on coronary artery blood flow and reflex cardiovascular regulation. In seven chloralose-anesthetized dogs 6-keto-PGE1 and prostacyclin (PGI2) were injected as a bolus into the left circumflex coronary artery in doses of 250 to 4000 ng. Coronary artery blood flow significantly increased and coronary artery resistance decreased in a dose-related manner. There were no significant differences observed between 6-keto-PGE1 and PGI2 in the magnitude of the maximum increase in coronary blood flow or decrease in coronary artery resistance. In six additional anesthetized dogs in which the carotid arteries were ligated in order to minimize baroreflexes, intracoronary injection of 6-keto-PGE1 and PGI2 (in doses of 7, 14 and 23 micrograms) caused systemic hypotension and bradycardia. Bilateral vagotomy attenuated the hypotension and abolished the bradycardia induced by these substances. In five conscious dogs, 6-keto-PGE1 and PGI2 were infused (2, 10 and 20 micrograms/min i.v.) for 10 min. 6-keto-PGE1 and PGI2 caused significant decreases in mean arterial pressure; however PGI2 was significantly more potent in this respect. The tachycardia to the highest doses was compared to that induced by infusion of nitroprusside (500 micrograms/min i.v.). 6-keto-PGE1 and PGI2 caused significantly less baroreflex tachycardia per millimeter of mercury decrease in arterial pressure than did nitroprusside. Thus, in anesthetized dogs, 6-keto-PGE1 and PGI2 are equipotent coronary vasodilators. These PGs also stimulate a vagal reflex which results in hypotension, bradycardia and attenuation of baroreflex-mediated tachycardia.(ABSTRACT TRUNCATED AT 250 WORDS)

UI	MeSH Term	Description	Entries
D008297	Male		Males
D011311	Pressoreceptors	Receptors in the vascular system, particularly the aorta and carotid sinus, which are sensitive to stretch of the vessel walls.	Baroreceptors,Receptors, Stretch, Arterial,Receptors, Stretch, Vascular,Stretch Receptors, Arterial,Stretch Receptors, Vascular,Arterial Stretch Receptor,Arterial Stretch Receptors,Baroreceptor,Pressoreceptor,Receptor, Arterial Stretch,Receptor, Vascular Stretch,Receptors, Arterial Stretch,Receptors, Vascular Stretch,Stretch Receptor, Arterial,Stretch Receptor, Vascular,Vascular Stretch Receptor,Vascular Stretch Receptors
D011464	Epoprostenol	A prostaglandin that is a powerful vasodilator and inhibits platelet aggregation. It is biosynthesized enzymatically from PROSTAGLANDIN ENDOPEROXIDES in human vascular tissue. The sodium salt has been also used to treat primary pulmonary hypertension (HYPERTENSION, PULMONARY).	Prostacyclin,Prostaglandin I2,Epoprostanol,Epoprostenol Sodium,Epoprostenol Sodium Salt, (5Z,9alpha,11alpha,13E,15S)-Isomer,Flolan,Prostaglandin I(2),Veletri
D012018	Reflex	An involuntary movement or exercise of function in a part, excited in response to a stimulus applied to the periphery and transmitted to the brain or spinal cord.
D001794	Blood Pressure	PRESSURE of the BLOOD on the ARTERIES and other BLOOD VESSELS.	Systolic Pressure,Diastolic Pressure,Pulse Pressure,Pressure, Blood,Pressure, Diastolic,Pressure, Pulse,Pressure, Systolic,Pressures, Systolic
D003326	Coronary Circulation	The circulation of blood through the CORONARY VESSELS of the HEART.	Circulation, Coronary
D004285	Dogs	The domestic dog, Canis familiaris, comprising about 400 breeds, of the carnivore family CANIDAE. They are worldwide in distribution and live in association with people. (Walker's Mammals of the World, 5th ed, p1065)	Canis familiaris,Dog
D006339	Heart Rate	The number of times the HEART VENTRICLES contract per unit of time, usually per minute.	Cardiac Rate,Chronotropism, Cardiac,Heart Rate Control,Heartbeat,Pulse Rate,Cardiac Chronotropy,Cardiac Chronotropism,Cardiac Rates,Chronotropy, Cardiac,Control, Heart Rate,Heart Rates,Heartbeats,Pulse Rates,Rate Control, Heart,Rate, Cardiac,Rate, Heart,Rate, Pulse
D000527	Alprostadil	A potent vasodilator agent that increases peripheral blood flow.	PGE1,Prostaglandin E1,Caverject,Edex,Lipo-PGE1,Minprog,Muse,PGE1alpha,Prostaglandin E1alpha,Prostavasin,Prostin VR,Prostine VR,Sugiran,Vasaprostan,Viridal,Lipo PGE1
D000818	Animals	Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA.	Animal,Metazoa,Animalia