Regional difference in ischaemia-induced myocardial interstitial noradrenaline and acetylcholine releases

Toru Kawada, Toji Yamazaki, Tsuyoshi Akiyama, Toshiaki Shishido, Shuji Shimizu, Masaki Mizuno, Hidezo Mori, Masaru Sugimachi

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

Knowledge of the regional differences in myocardial interstitial noradrenaline (NA) and acetylcholine (ACh) levels during ischaemia would be important to understand the abnormality of neuronal environment surrounding the ischaemic heart. Using a cardiac microdialysis technique, we compared ischaemia-induced changes in the myocardial interstitial NA and ACh levels among three groups of anesthetized cats: the anterior free wall of the left ventricle (ANT group, n = 7; the left anterior descending coronary artery was occluded), the posterior free wall of the left ventricle (POST group, n = 6; the left circumflex coronary artery was occluded), and the right ventricle (RV group, n = 6; the right coronary artery was occluded). The maximum NA level was not different between the ANT and POST groups but was significantly lower in the RV group (P < 0.01) [70 nM (SD 37), 106 nM (SD 99), and 7 nM (SD 10), respectively]. The maximum ACh level was not different between the ANT and POST groups but was significantly lower in the RV group (P < 0.05) [16 nM (SD 7), 20 nM (SD 15), and 6 nM (SD 2), respectively]. In contrast, there were no significant differences in NA or ACh release in response to a local administration of ouabain (10 mM) among the ANT, POST, and RV groups (n = 6 each). In conclusion, the regional difference of the ischaemic effects, rather than the regional difference in the functional distributions of sympathetic and vagal efferent nerve terminals, might contribute to the lower levels of ischaemia-induced NA and ACh releases in the RV group.

Original languageEnglish (US)
Pages (from-to)44-50
Number of pages7
JournalAutonomic Neuroscience: Basic and Clinical
Volume137
Issue number1-2
DOIs
StatePublished - Dec 30 2007

Keywords

  • Cardiac microdialysis
  • Cats
  • Coronary artery occlusion
  • Ouabain

ASJC Scopus subject areas

  • Endocrine and Autonomic Systems
  • Clinical Neurology
  • Cellular and Molecular Neuroscience

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