相关实验视频
Updated: Jun 23, 2026

08:00
Patch Clamp Recording of Ion Channels Expressed in Xenopus Oocytes
Published on: October 16, 2008
通过Xenopus卵细胞对中的连接素的表达形成间隙结
K I Swenson1, J R Jordan, E C Beyer
1Department of Anatomy and Cellular Biology, Harvard Medical School, Boston, Massachusetts 02115.
Cell
|April 7, 1989
概括
在Xenopus卵细胞中注射RNA显示,connexin32和connexin43诱导了细胞-细胞合. 连接素43,但不是连接素32或MP26,与对照卵细胞形成了不对称的结点.
科学领域:
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
- 神经科学是一个神经科学.
背景情况:
- 间隙连接对于细胞间通信至关重要,它介导离子和小分子直接从细胞到细胞的传递.
- 连接素是形成间隙结的主要蛋白质子单元,不同的连接素亚型表现出不同的通道特性.
- 了解连接素的功能需要研究它们形成功能性细胞-细胞通道的能力.
研究的目的:
- 为了研究Xenopus卵细胞中connexin32,connexin43和MP26RNAs的功能表达.
- 确定这些RNA诱导细胞-细胞合并形成功能间隙结的能力.
- 为了描述诱导导电的电特性.
主要方法:
- 在体外转录编码为connexin32,connexin43和MP26.6的RNAs.
- 这些RNA的微注射到Xenopus laevis卵子中.
- 用两电极电压技术对接注入的卵细胞和测量电气合.
主要成果:
- 在同型和异型卵细胞对中注射connexin32和connexin43RNA诱导了大,电压不敏感的导电量.
- MP26 RNA注射并没有诱导比控制水平高的显著导电量.
- 与注射水的卵细胞配对的connexin43RNA注射卵细胞表现出独特的,不对称的电压依赖导电量,与connexin32对不同.
结论:
- 连接32和连接43RNA可以诱导Xenopus卵细胞中的功能性细胞-细胞合.
- 康尼辛43在与未注射卵细胞形成异型间隙连接方面表现出独特的特性.
- 在这些实验条件下,MP26似乎没有形成功能性差距连接.
相关概念视频
Contact-dependent Signaling
Contact-dependent signaling, as the name suggests, requires that communicating cells be in direct contact with each other. This is achieved either through receptor-ligand interactions or by specialized cytoplasmic channels that allow the flow of small molecules between cells. In animal cells, channels called gap junctions facilitate contact-dependent signaling in certain tissues, whereas, plasmodesmata perform a similar function in plants.
Gap Junctions
In animal cells, gap junctions are formed...
Gap Junctions
In animal cells, gap junctions are formed...
Gap Junctions
Multicellular organisms employ a variety of ways for cells to communicate with each other. Gap junctions are specialized proteins that form pores between neighboring cells in animals, connecting the cytoplasm between the two, and allowing for the exchange of molecules and ions. They are found in a wide range of invertebrate and vertebrate species, mediate numerous functions including cell differentiation and development, and are associated with numerous human diseases, including cardiac and...
Overview of Cell-Matrix Interactions
The extracellular matrix or ECM holds cells together to form a tissue and allows the cells within the tissue to communicate. ECM comprises proteins such as fibronectin, collagen, laminin, etc. The most abundant protein in this space is collagen. Collagen fibers are interwoven with carbohydrate-containing protein molecules called proteoglycans. ECM allows cell migration and provides a structural scaffold at cell adhesion that anchors the cell when the extracellular matrix proteins interact with...
Overview of Cell-Cell Junctions
The complex three-dimensional arrangement of cells in any multicellular organism is defined and maintained by interactions of cells with each other and the extracellular matrix. Cell-cell junctions are specialized structures where the multi-protein complexes on one cell interact with the multi-protein complexes on another cell. These cell junctions are classified into three main types based on their function — occluding, anchoring, and gap junctions.
Occluding or Tight Junctions
Tight...
Occluding or Tight Junctions
Tight...
Tight Junctions
Tight junctions are molecular seals between cells that prevent the leaking of fluids, ions, and other small solutes across cavities and compartments in multicellular organisms. They are mainly composed of claudin and occludin transmembrane proteins, and other proteins such as tricellulin and JAM (junctional adhesion molecule). All these proteins are 4-pass transmembrane proteins, except JAM, which is a single-pass transmembrane protein belonging to the immunoglobulin superfamily. The...
Gap Junctions
The cytoplasm of adjacent animal cells can exchange small molecules, ions, and secondary messengers via the communication channels which form the gap junctions. These junctions comprise a few hundred to thousands of molecular channels, each made of two halves, called the connexon hemichannel. A connexon is a hexamer of six transmembrane connexin proteins, which assemble radially, thus forming a pore or channel in the center. One connexon hemichannel docks with a corresponding connexon on the...

