자궁평활근의 Carbachol 및 Oxytocin 수축에 있어서의 세포내 Ca2+ 동원

• 영문명: Intracellular Ca²⁺ Movement in Contraction Induced by Carbachol and Oxytocin in Rat Myometrium
• 발행기관: 대한약리학회
• 저자명: 김보경(Bo-Kyung Kim) 정동수(Dong-Su Chung) 김윤선(Yoon-Sun Kim) 이윤호(Yoon-Ho Lee) 용준환(Jun-Hwan Yong) 이원창(Won-C
• 간행물 정보: 『대한약리학잡지』제32권 제2호, 221~232쪽, 전체 12쪽
• 주제분류: 의약학 > 기타의약학
• 파일형태: PDF
• 발행일자: 1996.09.30

영문 초록

The properties of cytosolic Ca²⁺ level([Ca²⁺]_i) movement of high KCl, carbachol and oxytocin were examined with myometrium isolated from non-pregnant rat(estrus cycle). High concentration of KCl≤23.3mM) induced rhythmic increases in [Ca²⁺]_i and muscle contraction. However, sustained [Ca²⁺]_i and contracion were obtained at higher KCl concentration (≥30.3mM) The rhythmic and sustained contraction closely associated with changes in [Ca²⁺]_i induced by high KCl. Carbachol (3 ~ 30μM generated rhythmic increases with tonic component in [Ca²⁺]_i and muscle contraction. Myometrial contraction stimulated by carbachol was also closely correlated with change in [Ca²⁺]_i. And the [Ca²⁺]_i/contraction relationships were similar when muscle strips were stimulated by high KCl and carbachol. Maximal concentration of carbachol (10μM) and oxytocin(100 nM) increased [Ca²⁺]_i and contraction which were slightly greater than that of high KCl in non-pregnant myometrium, respectively. However, the [Ca²⁺]_i and contraction were strongly inhibited by verapamil (10μM), a 1-type Ca²⁺ channel blocker, as in the case of high KCl. Additionally, although carbachol further increased [Ca²⁺]_i and contraction induced by high KCl, these changes also strongly inhibited by application of verapamil. These results suggest that uterotonic agents, carbachol and oxytocin, induced contraction by increase in [Ca²⁺]_i through Ca²⁺ influx than by a regulation of Ca²⁺-sensitization in non-pregnant myometrium.

키워드

Intracellular Ca²⁺ Myometrium Ca²⁺ sensitivity Smooth muscle contraction