Cellular Mechanisms of Myogenic Activity in Gastric Smooth Muscle

この論文にアクセスする

この論文をさがす

著者

抄録

In many regions of the intestine, a thin layer of interstitial cells of Cajal (ICC) lie in the myenteric region, between the circular and longitudinal muscle layers. ICC are connected by gap junctions to surrounding ICC and also with circular and longitudinal smooth muscle cells, forming a large electrical syncytium. Damage of the ICC causes a disorder in the patterns of rhythmic activity. Isolated ICC produce a rhythmic oscillation of the membrane potential. All these observations have led to the suggestion that ICC may be the pacemaker cell responsible for intestinal activity. Gastric smooth muscles generate slow oscillatory membrane potential changes (slow waves) and spike potentials. The activity is considered to be linked to the metabolism in the cell. Three types of cells located in the gastric wall (circular and longitudinal smooth muscle cells and ICC) produce synchronized electrical responses with different shapes. The electrical responses appear to originate in ICC and then spread to the smooth muscle layers, indicating that ICC may also be the pacemaker cells responsible for gastric activity. However, isolated circular smooth muscle tissues spontaneously generate regenerative potentials, suggesting that there are at least two sites for the initiation of spontaneous activity in the stomach. Regenerative potentials persist in the presence of Ca-antagonists and are inhibited by agents which disrupt intracellular Ca<sup>2+</sup> homeostasis. Depolarization of the membrane elicits regenerative potentials after a long delay and the potentials have long refractory periods. This suggests that an unidentified 2nd messenger may be formed during the delay between membrane depolarization and the initiation of a regenerative potential. In gastric muscles of mutant mice which do not express inositol trisphosphate (InsP<sub>3</sub>) receptors, spike potentials but not slow waves are generated, suggesting the possible involvement of InsP<sub>3</sub> in the initiation of spontaneous activity.<br>

収録刊行物

  • The Japanese journal of physiology

    The Japanese journal of physiology 50(3), 289-301, 2000-06

    PHYSIOLOGICAL SOCIETY OF JAPAN

参考文献:  91件中 1-91件 を表示

被引用文献:  16件中 1-16件 を表示

各種コード

  • NII論文ID(NAID)
    10008291245
  • NII書誌ID(NCID)
    AA00691224
  • 本文言語コード
    ENG
  • 資料種別
    REV
  • ISSN
    0021521X
  • NDL 記事登録ID
    5525733
  • NDL 雑誌分類
    ZS8(科学技術--医学--解剖学・生理学・生化学)
  • NDL 請求記号
    Z53-D40
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
ページトップへ