华西口腔医学杂志

• 基础研究 • 上一篇    下一篇

周期性牵张体外培养面颌成肌细胞肌浆网Ca~(2+)-Mg~(2+)ATP酶活性及其mRNA变化的研究

车晓霞1,曾 宏2,罗颂椒3   

  1. 1.首都医科大学北京口腔医院 正畸科,北京100050;2.成都地奥集团,四川 成都610000; 3.四川大学华西口腔医院 正畸科,四川 成都610041
  • 收稿日期:2004-08-25 修回日期:2004-08-25 出版日期:2004-08-20 发布日期:2004-08-20
  • 通讯作者: 罗颂椒,Tel:028-85501492
  • 作者简介:车晓霞(1969-),女,河北人,住院医师,博士
  • 基金资助:
    国家自然科学基金资助项目(30171024)

Changes of Sarco(endo)plasmic Reticulum Ca2+-Mg2+-ATPase Activity of Cultured Myoblast Induced by Cyclic Stretch

CHEXiao-xia1,ZENGHong2,LUO Song-jiao3   

  1. 1.Dept.ofOrthodontics,BeijingStomatologyHospital,Beijing100050, China; 2.Institute ofMateria Medical,Diao Group,Chengdu610000,China; 3.Dept.ofOrthodontics,West China College ofStomatology,Sichuan University,Chengdu610041,China
  • Received:2004-08-25 Revised:2004-08-25 Online:2004-08-20 Published:2004-08-20

摘要:

目的 观察牵张引起的成肌细胞内Ca2+-Mg2+ATP酶活性及mRNA变化,探求口腔正畸功能矫形治疗中肌肉改建机理,为正畸临床治疗及防止复发提供理论性指导。方法 采用四点弯曲加力装置,使体外培养的SD大鼠面颌部成肌细胞发生牵张变形后,无机磷-钼酸铵直接比色法测定加力后不同时段Ca2+-Mg2+ATP酶活性,RT- PCR测定肌浆网Ca2+-Mg2+ATP酶mRNA变化。结果 SD大鼠体外培养成肌细胞在加力变形后的4 h内Ca2+- Mg2+ATP酶活性显著降低,8 h到24 h期间明显升高,48 h基本接近对照组水平;此外,RT-PCR结果显示成肌细胞受牵张力后Ca2+-Mg2+ATP酶mRNA水平在各时间段组均较对照组升高,其中以2 h和48 h段组升高最明显。结论 随着受力时间的延长,成肌细胞发生了适应性变化,Ca2+-Mg2+ATP酶活性变化的控制发生在基因翻译前水平,Ca2+-Mg2+ATP酶活性及其mRNA变化会直接影响对细胞内游离Ca2+浓度的调节,继而引起细胞内发生的一系列生物学反应的变化。

关键词: 牵张, 成肌细胞, Ca2+-Mg2+ATP酶

Abstract:

Objective To evaluate the effect of stretch on sarco(endo)plasmic reticulum Ca2+-Mg2+ATPases activity and mR- NA level and study the remodeling reaction of muscle in a variety of mechanical environments.Methods Myoblast from maxillo- facial skeletal muscle of one-week-old male Sprague-Dawley ratwas cultured and stretched cyclicly using a four-point bend device. Inorganic Phosphorus test was used to compare the activity of Ca2+-Mg2+ATPases of myoblast before and after stretch. RT-PCR was also used to observe the Ca2+-Mg2+ATPases mRNA level.Results The activity of Ca2+-Mg2+ATPases of myoblast down regulated significantly in 4 hours. During the period of 8 hours to 24 hours, up-regulation followed then returned to control level at the 48 hour point. RT-PCR showed that Ca2+-Mg2+ATPases mRNA level were elevated by stretch, particularly at 2 hour and 48 hour point.Conclusion The results suggested a transcriptional control of Ca2+-Mg2+ATPases activitywas involved in the muscle remodeling process induced by stretch.

Key words: stretch, myoblast, Ca2+-Mg2+ATPases