Determination of Acetylcholine Release in the Striatum of Anesthetized Rats Using In Vivo Microdialysis and a Radioimmunoassay

Koichiro Kawashima, Toru Hayakawa, Yuko Kashima, Takeshi Suzuki, Kazuko Fujimoto, Hisayo Oohata

研究成果: Article査読

48 被引用数 (Scopus)


A vertical‐type in vivo microdialysis probe and a sensitive, specific radioimmunoassay (RIA) were used to study the mechanism of acetylcholine (ACh) release in the striatum of anesthetized rats. Without the use of physostigmine, a cholincsterase inhibitor, our RIA could still detect the amount of ACh present in the perfusate (5.6 ± 0.6 fmol/min, n = 16). Tetrodotoxin (1 μM) produced a significant decrease in the amount of ACh collected in the perfusate, suggesting that basal ACh determined under the present experimental conditions was related to cholinergic neural activity. Atropine (0.1–1 μM) applied topically via the dialysis probe did not affect the amount of ACh recovered in the perfusate in the absence of physostigmine. Addition of physostigmine (10 μM) to the perfusion fluid produced about a 100‐fold increase in the amount of ACh collected. In the presence of physostig mine, topical administration of atropine and pirenzepine (0.01–1 μM) through a dialysis probe produced a further three‐to fourfold increase in ACh output, whereas a slight increase was produced by AF‐DX 116 at the highest concentration (1 μM). These results indicate that presynaptic modulation of ACh release in the striatum does not occur under basal conditions, and that presynaptic M, muscarinic receptors are involved in the modulation of ACh release when the ACh concentration is raised under certain conditions.

ジャーナルJournal of Neurochemistry
出版ステータスPublished - 1991 9月

ASJC Scopus subject areas

  • 生化学
  • 細胞および分子神経科学


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