Effects of transient, global, cerebral ischemia on striatal extracellular dopamine, serotonin and their metabolites.
Rat striatal extracellular fluid levels of dopamine, serotonin, 3-methoxytyramine (3-MT), 3,4-dihydroxyphenylacetic acid (DOPAC), homovanillic acid (HVA) and 5-hydroxyindoleacetic acid (5-HIAA) were measured before, during and after transient, global cerebral ischemia in awake rats using in vivo brain microdialysis. Before ischemia, extracellular levels of dopamine, DOPAC, HVA and 5-HIAA were detectable and consistent from sample to sample. During cerebral ischemia, there was a large increase in extracellular dopamine levels and a decrease in the extracellular levels of DOPAC, HVA, and 5-HIAA. During reperfusion, dopamine levels returned to normal as did those of DOPAC, HVA and 5-HIAA. Dialysate serotonin and 3-methoxytyramine concentrations were below detection limits except for samples collected during ischemia and early reperfusion.
Phebus
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LA
Lilly Research Laboratories, Lilly Corporate Center, Indianapolis, Indiana 46285.
Clemens
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JA
D015102:3,4-Dihydroxyphenylacetic Acid / Q000378:metabolism; D000818:Animals; D002545:Brain Ischemia / Q000378:metabolism*; D003342:Corpus Striatum / Q000378:metabolism*; D004298:Dopamine / Q000378:metabolism*; D005110:Extracellular Space / Q000378:metabolism; D006719:Homovanillic Acid / Q000378:metabolism; D006897:Hydroxyindoleacetic Acid / Q000378:metabolism; D002546:Ischemic Attack, Transient / Q000378:metabolism*; D008297:Male; D051381:Rats; D011919:Rats, Inbred Strains; D012016:Reference Values; D015424:Reperfusion; D012701:Serotonin / Q000378:metabolism*
D015102:3,4-Dihydroxyphenylacetic Acid; D012701:Serotonin; D006897:Hydroxyindoleacetic Acid; D004298:Dopamine; D006719:Homovanillic Acid