Distribution of mRNA encoding a nitrobenzylthioinosine-insensitive nucleoside transporter (ENT2) in rat brain.
Nucleoside transporters may play a role in regulating levels of extracellular adenosine and adenosine receptor activity. Two members of the equilibrative nucleoside transporter family have recently been cloned. ENT1 is potently inhibited by nitrobenzylthioinosine (NBMPR) (K(i) approximately 1 nM) and was previously found to have a wide distribution in rat and human brain. ENT2 is insensitive to inhibition by NBMPR at low nanomolar concentrations and there is limited information describing its distribution in rat brain. The present study used RT-PCR, northern blot and in situ hybridization and detected rENT2 transcript in several brain regions including hippocampus, cortex, striatum and cerebellum. Our results indicate a wide cellular and regional distribution for ENT2 in rat brain, similar to ENT1, indicating that control of adenosine levels in brain is achieved by multiple transport processes.
Department of Pharmacology and Therapeutics, University of Manitoba, 753 McDermot Avenue, Winnipeg, Canada.
C M
CM
Anderson
S A
SA
Baldwin
J D
JD
Young
C E
CE
Cass
F E
FE
Parkinson
D000818:Animals; D001921:Brain / Q000378:metabolism*; D002352:Carrier Proteins / Q000235:genetics*; D002560:Cerebrovascular Circulation / Q000502:physiology; D002831:Choroid Plexus / Q000378:metabolism; D006624:Hippocampus / Q000378:metabolism; D006801:Humans; D017403:In Situ Hybridization; D008565:Membrane Proteins / Q000235:genetics*; D033703:Nucleoside Transport Proteins; D009928:Organ Specificity; D012333:RNA, Messenger / Q000032:analysis / Q000235:genetics*; D051381:Rats; D020133:Reverse Transcriptase Polymerase Chain Reaction; D014158:Transcription, Genetic
D002352:Carrier Proteins; D008565:Membrane Proteins; D033703:Nucleoside Transport Proteins; D012333:RNA, Messenger