HOMEPRODUCTSCOMPANYCONTACTFAQResearchDictionaryPharmaSign Up FREE or Login

The selective A2A receptor antagonist SCH 58261 reduces striatal transmitter outflow, turning behavior and ischemic brain damage induced by permanent focal ischemia in the rat.

Abstract
Adenosine A(2A) receptor antagonists have been proved protective in different ischemia models. In this study we verified if the protective effect of the selective A(2A) antagonist, SCH 58261, could be attributed to the reduction of the excitatory amino acid outflow induced by cerebral focal ischemia. A vertical microdialysis probe was inserted into the striatum of male Wistar rats and, after 24 h, permanent right intraluminal middle cerebral artery occlusion (MCAo) was induced. Soon after waking, rats showed a definite contralateral turning behavior, which persisted up to 7 h after MCAo. During 4 h after MCAo, glutamate, aspartate, GABA, adenosine and taurine outflow increased. SCH 58261 (0.01 mg/kg, i.p.), administered 5 min after MCAo, suppressed turning behavior and significantly reduced the outflow of glutamate, aspartate, GABA and adenosine. At 24 h after MCAo, the rats showed severe sensorimotor deficit and damage in both the striatum and cortex. SCH 58261 significantly reduced cortical damage but did not protect against the sensorimotor deficit. The protective effect of SCH 58261 against turning behavior and increased outflow of excitatory amino acids in the first hours after MCAo suggests the potential utility of selective adenosine A(2A) antagonists when administered in the first hours after ischemia. Furthermore, this study, for the first time, proposes that turning behavior after permanent intraluminal MCAo, be used as a precocious index of neurological deficit and neuronal damage.
AuthorsAlessia Melani, Leonardo Pantoni, Francesca Bordoni, Marco Gianfriddo, Loria Bianchi, Maria Giuliana Vannucchi, Rosalia Bertorelli, Angela Monopoli, Felicita Pedata
JournalBrain research (Brain Res) Vol. 959 Issue 2 Pg. 243-50 (Jan 10 2003) ISSN: 0006-8993 [Print] Netherlands
PMID12493612 (Publication Type: Comparative Study, Journal Article, Research Support, Non-U.S. Gov't)
Chemical References
  • 5-amino-7-(2-phenylethyl)-2-(2-furyl)pyrazolo(4,3-e)-1,2,4-triazolo(1,5-c)pyrimidine
  • Neurotransmitter Agents
  • Purinergic P1 Receptor Antagonists
  • Pyrimidines
  • Receptor, Adenosine A2A
  • Receptors, Purinergic P1
  • Triazoles
Topics
  • Animals
  • Brain Ischemia (drug therapy, metabolism, pathology)
  • Corpus Striatum (drug effects, metabolism)
  • Male
  • Motor Activity (drug effects)
  • Neurotransmitter Agents (metabolism)
  • Purinergic P1 Receptor Antagonists
  • Pyrimidines (pharmacology, therapeutic use)
  • Rats
  • Rats, Wistar
  • Receptor, Adenosine A2A
  • Receptors, Purinergic P1 (metabolism)
  • Triazoles (pharmacology, therapeutic use)

Join CureHunter, for free Research Interface BASIC access!

Take advantage of free CureHunter research engine access to explore the best drug and treatment options for any disease. Find out why thousands of doctors, pharma researchers and patient activists around the world use CureHunter every day.
Realize the full power of the drug-disease research graph!


Choose Username:
Email:
Password:
Verify Password:
Enter Code Shown: