title: Effects of angiotensin III and angiotensin IV on pentylenetetrazol seizure susceptibility (threshold and kindling): interaction with adenosine A(1) receptors.
abstract: The effects of angiotensin (ANG) III and ANG IV on pentylenetetrazol (PTZ) seizure susceptibility--threshold and kindling in mice--as well as the influence of adenosine A(1) receptor agents (agonist and antagonist) on these effects were studied. It was found that ANG III and ANG IV increased dose-dependently the PTZ seizure threshold and decreased the seizure intensity in PTZ kindled mice. Cyclohexyladenosine (CHA), an adenosine A(1) receptor agonist, potentiated the effects of ANG III and ANG IV on the seizure threshold and kindling, whereas DPCPX (an A(1) receptor antagonist) reversed peptide-induced effects on the PTZ kindling. Taken together, ANG III and ANG IV decrease the PTZ seizure susceptibility. We could suggest that these effects are realized in part through interaction with adenosine A(1) receptors.
authors.affiliation: Laboratory Experimental Psychopharmacology, Institute of Physiology, Bulgarian Academy of Sciences, Sofia, Bulgaria. jane_tch@yahoo.com
authors.forename: J
authors.initials: J
authors.lastname: Tchekalarova
authors.forename: T
authors.initials: T
authors.lastname: Kambourova
authors.forename: V
authors.initials: V
authors.lastname: Georgiev
mesh_terms: D000241:Adenosine / Q000819:agonists / Q000031:analogs & derivatives* / Q000378:metabolism* / Q000494:pharmacology; D000804:Angiotensin II / Q000031:analogs & derivatives* / Q000378:metabolism / Q000494:pharmacology; D000805:Angiotensin III / Q000378:metabolism / Q000494:pharmacology; D000809:Angiotensins / Q000378:metabolism* / Q000494:pharmacology; D000818:Animals; D001921:Brain / Q000187:drug effects / Q000378:metabolism* / Q000503:physiopathology; D003292:Convulsants / Q000494:pharmacology; D004198:Disease Susceptibility / Q000378:metabolism / Q000503:physiopathology; D004305:Dose-Response Relationship, Drug; D004347:Drug Interactions / Q000502:physiology; D004827:Epilepsy / Q000378:metabolism* / Q000503:physiopathology; D007696:Kindling, Neurologic / Q000187:drug effects / Q000502:physiology*; D008297:Male; D051379:Mice; D008813:Mice, Inbred ICR; D010433:Pentylenetetrazole / Q000494:pharmacology; D058906:Purinergic P1 Receptor Agonists; D058915:Purinergic P1 Receptor Antagonists; D018047:Receptors, Purinergic P1 / Q000378:metabolism*; D012640:Seizures / Q000139:chemically induced / Q000378:metabolism* / Q000503:physiopathology; D014970:Xanthines / Q000494:pharmacology
chemical_list: D000809:Angiotensins; D003292:Convulsants; D058906:Purinergic P1 Receptor Agonists; D058915:Purinergic P1 Receptor Antagonists; D018047:Receptors, Purinergic P1; D014970:Xanthines; D000804:Angiotensin II; D000805:Angiotensin III; C012877:angiotensin II, des-Asp(1)-des-Arg(2)-Ile(5)-; C027513:N(6)-cyclohexyladenosine; C051360:1,3-dipropyl-8-cyclopentylxanthine; D000241:Adenosine; D010433:Pentylenetetrazole