中国组织工程研究

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L型钙通道在碱性成纤维细胞生长因子调控软骨细胞增殖中的作用

王  强,何金山,熊传芝,冯新民,王静成,颜连启,陈鹏涛,蔡  俊   

  1. 江苏省苏北人民医院骨科,江苏省扬州市  225001
  • 修回日期:2013-10-08 出版日期:2013-12-10 发布日期:2013-12-10
  • 通讯作者: 蔡俊,硕士,主治医师,江苏省苏北人民医院骨科,江苏省扬州市 225001 13952579389@126.com
  • 作者简介:王强★,男,1974年生,江苏省泰州市人,汉族, 1999年南京大学医学院毕业,硕士,副主任医师,主要从事关节置换及关节内、关节周围创伤的临床医疗科研工作。 wangqiangyz@sina.com
  • 基金资助:

    扬州市后备人才基金*;江苏省苏北人民医院院级基金资助项目(NJPH200910)*

Effects of the L-type calcium channels on chondrocytes in response to basic fibroblast growth factor

Wang Qiang, He Jin-shan, Xiong Chuan-zhi, Feng Xin-min, Wang Jing-cheng, Yan Lian-qi, Chen Peng-tao, Cai Jun   

  1. Department of Orthopedics, Northern Jiangsu People’s Hospital, Yangzhou  225001, Jiangsu Province, China
  • Revised:2013-10-08 Online:2013-12-10 Published:2013-12-10
  • Contact: Cai Jun, Master, Attending physician, Department of Orthopedics, Northern Jiangsu People’s Hospital, Yangzhou 225001, Jiangsu Province, China 13952579389@126.com
  • About author:Wang Qiang★, Master, Associate chief physician, Department of Orthopedics, Northern Jiangsu People’s Hospital, Yangzhou 225001, Jiangsu Province, China wangqiangyz@sina.com
  • Supported by:

    the Backup Talented Man Foundation of Yangzhou City*; the Northern Jiangsu People’s Hospital Foundation of Jiangsu Province, No. NJPH200910*

摘要:

背景:L型钙通道作为电压依赖式钙通道的一种,是细胞外钙离子进入细胞内的主要途径,在维持细胞的形态及生理活动上起重要作用,具有单通道电导较大,通道衰减较慢,通道开放持续时间较长的特点,以往研究表明碱性成纤维细胞生长因子能够促进体外培养的软骨细胞的增殖。
目的:利用膜片钳技术探讨L型钙通道在碱性成纤维细胞生长因子对软骨细胞增殖分化调控中的作用。
方法:取3日龄新西兰兔关节软骨细胞,培养至第2代后,随机分为实验组和对照组,关节软骨细胞分别在含有10 μg/L的碱性成纤维细胞生长因子及不含生长因子的培养液中培养。采用膜片钳记录L型钙通道在碱性成纤维细胞生长因子作用下的开放情况。然后采用激光共聚焦显微镜观察碱性成纤维细胞生长因子培养2周后软骨细胞内游离钙离子浓度。最后用Cell Titer单溶液细胞增殖反应试剂盒分析连续培养8 d软骨细胞增殖情况和免疫组织化学染色方法观察培养10 d后软骨细胞合成Ⅱ型胶原情况。
结果与结论:碱性成纤维细胞生长因子对L型钙通道的开放有一定的抑制作用,导致细胞内游离钙离子浓度降低(P < 0.01)。碱性成纤维细胞生长因子培养的软骨细胞与常规条件下培养的软骨细胞相比细胞数量增多   (P < 0.01),Ⅱ型胶原染色面积明显增大(P < 0.05)。结果证实,碱性成纤维细胞生长因子能够通过抑制L型钙通道的开放使软骨细胞内钙离子浓度维持在较低水平,以此促进软骨细胞的增殖和分化。



中国组织工程研究
杂志出版内容重点:组织构建;骨细胞;软骨细胞;细胞培养;成纤维细胞;血管内皮细胞;骨质疏松组织工程


全文链接:

关键词: 组织构建, 软骨组织构建, 软骨细胞, 碱性成纤维细胞生长因子, 钙离子, 钙通道, 膜片钳, 组织工程

Abstract:

BACKGROUND: L-type calcium channels, as a kind of voltage-dependent calcium channel, is the main way of extracellular calcium ions into the cell, and play an important role in maintaining cell morphology and physiological activities, characterized by a large single-channel conductance, slow channel attenuation, and longer duration of channel opening. Previous studies showed that basic fibroblast growth factor can promote the proliferation of chondrocytes cultured in vitro.
OBJECTIVE: To explore the effect of the L-type calcium channels on regulating chondrocyte proliferation and differentiation in response to basic fibroblast growth factor with patch-clamp.
METHODS: The chondrocytes were harvested from the joints of 3-day-old New Zealand rabbits. The second passage of chondrocytes was divided into experimental group and control group. Chondrocytes were incubated in media containing 10 μg/L basic fibroblast growth factor and media alone separately. The opening of L-type calcium channels under the action of basic fibroblast growth factor was detected by patch-clamp. The intracellular calcium concentration was detected with laser confocal microscopy in the chondrocytes after 2 weeks of culture with basic fibroblast growth factor. Chondrocyte proliferation was analyzed by Cell Titer kit after 8 days of culture. Type Ⅱ collagen was assessed quantitatively by immunohistochemistrical staining after 10 days of culture. 
RESULTS AND CONCLUSION: Basic fibroblast growth factor has an inhibitory effect on the opening of the L-type calcium channels, resulting in a decrease in intracellular free calcium concentration (P < 0.01). Cell number was higher after culture with basic fibroblast growth factor than that cultured under conventional condition (P < 0.01), and staining area of type II collagen significantly increased (P < 0.05). Results verified that basic fibroblast growth factor can maintain intracellular Ca2+ concentration at a low level by inhibiting the opening of L-type calcium channels, which can promote the proliferation and differentiation of chondrocytes.



中国组织工程研究
杂志出版内容重点:组织构建;骨细胞;软骨细胞;细胞培养;成纤维细胞;血管内皮细胞;骨质疏松组织工程


全文链接:

Key words:  patch clamp, L-type calcium channel, chondrocytes, cell proliferation, cell growth factor

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