Adenosine receptor expression and function in rat striatal cholinergic interneurons

Z Preston, K Lee, L Widdowson, T C Freeman, A K Dixon, P J Richardson

Research output: Contribution to journalArticlepeer-review

Abstract

Cholinergic neurons were identified in rat striatal slices by their size, membrane properties, sensitivity to the NK(1) receptor agonist (Sar(9), Met(O(2))(11)) Substance P, and expression of choline acetyltransferase mRNA. A(1) receptor mRNA was detected in 60% of the neurons analysed, and A(2A) receptor mRNA in 67% (n=15). The A(1) receptor agonist R-N(6)-(2-phenylisopropyl)adenosine (R-PIA) hyperpolarized cholinergic neurons in a concentration dependent manner sensitive to the A(1) antagonist 8-cyclopentyl-1, 3-dipropylxanthine (DPCPX, 100 nM). In dual stimulus experiments, the A(2A) receptor antagonist 8-(3-chlorostyryl)caffeine (CSC, 500 nM) decreased release of [(3)H]-acetylcholine from striatal slices (S2/S1 0.78+/-0.07 versus 0.95+/-0.05 in control), as did adenosine deaminase (S2/S1 ratio 0.69+/-0.05), whereas the A(1) receptor antagonist DPCPX (100 nM) had no effect (S2/S1 1.05+/-0.14). In the presence of adenosine deaminase the adenosine A(2A) receptor agonist 2-p-((carboxyethyl)phenylethylamino)-5'-N-ethylcarboxamidoadeno sin e (CGS21680, 10 nM) increased release (S2/S1 ratio 1.03+/-0.05 versus 0.88+/-0.05 in control), an effect blocked by the antagonist CSC (500 nM, S2/S1 0.68+/-0.05, versus 0.73+/-0.08 with CSC alone). The combined superfusion of bicuculline (10 microM), saclofen (1 microM) and naloxone (10 microM) had no effect on the stimulation by CGS21680 (S2/S1 ratio 0.99+/-0.04). The A(1) receptor agonist R-PIA (100 nM) inhibited the release of [(3)H]-acetylcholine (S2/S1 ratio 0.70+/-0.03), an effect blocked by DPCPX (S2/S1 ratio 1.06+/-0.07). It is concluded that both A(1) and A(2A) receptors are expressed on striatal cholinergic neurons where they are functionally active.
Original languageEnglish
Pages (from-to)886-90
Number of pages5
JournalBritish Journal of Pharmacology
Volume130
Issue number4
DOIs
Publication statusPublished - Jun 2000

Keywords

  • Acetylcholine
  • Adenosine
  • Adenosine Deaminase
  • Animals
  • Baclofen
  • Bicuculline
  • Caffeine
  • Cholinergic Fibers
  • Corpus Striatum
  • Dose-Response Relationship, Drug
  • GABA Antagonists
  • Gene Expression
  • Male
  • Membrane Potentials
  • Naloxone
  • Narcotic Antagonists
  • Neurons
  • Phenethylamines
  • RNA, Messenger
  • Rats
  • Rats, Sprague-Dawley
  • Receptors, Purinergic P1
  • Tritium
  • Xanthines

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