在人类结肠腺癌细胞系上鉴定VIP的核受体
1Department of Medicine, University of California, San Diego, La Jolla 92093.
概括
在人类结肠癌细胞中发现了血管活性肠 (VIP) 的核受体. 这些核VIP受体具有相似之处,但大小不同于细胞表面的VIP受体.
科学领域:
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
- 神经信号传递的神经信号传递
背景情况:
- 血管活性肠 (VIP) 是一种具有广泛组织分布的神经.
- VIP的确切功能在很大程度上是未知的,但据信它与细胞表面受体相互作用.
- 核VIP受体的存在和作用以前没有被确立.
研究的目的:
- 调查VIP核受体的存在和特征.
- 将核VIP受体与已知的细胞表面VIP受体进行比较.
主要方法:
- 使用125I标记的VIP来评估HT29人类结肠腺癌细胞与分离的细胞核的结合.
- 采用交叉链接技术来识别完整核上的VIP受体.
- 使用电子显微镜验证核纯度.
- 将VIP受体结合与125I标记的转激素结合进行比较.
主要成果:
- 在HT29细胞中观察到125I标记的VIP与细胞核的特定结合.
- 交叉链接证实了VIP受体在完整的细胞核上存在.
- 标记为125I的转激素显示了最小的核结合,支持了VIP核结合的特异性.
- 核和细胞表面VIP受体的表面分子大小相似,但不完全相同.
结论:
- 在人类结肠癌细胞中已经确定了VIP的核受体.
- 这些发现表明,VIP信号的潜在直接核作用.
- 核VIP受体与它们的细胞表面对应物有微妙的差异.
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