PMID: 11311901Apr 20, 2001Paper

Distinct regional distribution of human equilibrative nucleoside transporter proteins 1 and 2 (hENT1 and hENT2) in the central nervous system

Neuropharmacology
L L JenningsCarol E Cass

Abstract

Nucleoside transport processes play an important role in human cells in salvage of nucleosides used in the biosynthesis of nucleic acids and in regulating endogenous adenosine concentrations in the human central nervous system (CNS). By altering the levels of adenosine available to interact with cell-surface receptors, nucleoside transporters have profound effects on the ability of adenosine to modulate neurotransmission, vascular tone and other physiological events. Although the human equilibrative nucleoside transporters 1 and 2 (hENT1 and hENT2) are believed to play a crucial role in modulating brain function, their distribution within the major divisions of the human CNS is not known. In this work, antibodies specific for hENT1 and hENT2 were produced against fragments of the transporter proteins and used for immunoblot analysis of enriched membrane fractions prepared from several regions of the human brain. While hENT1 was most prevalent in the frontal and parietal lobes of the cerebral cortex, thalamus, midbrain and basal ganglia, hENT2 was concentrated in the cerebellum and brainstem regions, particularly the pons. The apparent reciprocal distribution of hENT1 and hENT2 in human brain suggests that these nucleoside trans...Continue Reading

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