一种化物通道在上皮细胞和非上皮细胞中广泛表达
A Thiemann1, S Gründer, M Pusch
1Centre for Molecular Neurobiology (ZMNH), Hamburg University, Hamburg, Germany.
Nature
|March 5, 1992
概括
研究人员确定了ClC-2,这是一个新的电压关闭的化物通道,对大多数细胞来说很重要. 这个通道表达广泛,可能在诸如囊性纤维化等疾病中起作用.
科学领域:
- 分子生物学分子生物学
- 生理学 生理学 生理学
- 离子通道研究
背景情况:
- 化通道调节重要的细胞功能,如体积,膜潜力和运输.
- 化物通道的缺陷与诸如囊性纤维化和肌等疾病有关.
- 现有的克隆通道分为联接式,电压式和潜在的ATP结合式磁带输送器类.
研究的目的:
- 为了描述ClC-2,一个新发现的电压化物通道家族的成员.
- 研究ClC-2的表达模式和功能性质.
主要方法:
- 序列分析比较ClC-2与已知的通道 (ClC-0,ClC-1).
- 在各种老鼠组织 (心脏,大脑) 和细胞系 (纤维细胞,神经元,上皮细胞) 中进行表达分析.
- 使用Xenopus卵细胞表达来测量化物电流的功能研究.
主要成果:
- ClC-2与ClC-0和ClC-1共享大约50%的序列相同性.
- ClC-2在多种组织和细胞类型中广泛表达,包括受囊性纤维化影响的组织和细胞类型.
- 表达的ClC-2通道在超极化时表现出缓慢的激活和线性电流电压关系,其导电序列为Cl- ≥ Br- > I-.
结论:
- 与ClC-1相比,ClC-2代表了一种新的电压化通道,与ClC-1相比,它具有独特的表达特征.
- 广泛的表达表明ClC-2在大多数细胞生理学中的基本作用.
- 对ClC-2功能的进一步研究可能会为涉及化通道功能障碍的疾病提供见解.
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...
Cell Specific Gene Expression
Multicellular organisms contain a variety of structurally and functionally distinct cell types, but the DNA in all the cells originated from the same parent cells. The differences in the cells can be attributed to the differential gene expression. Liver cells, whose functions include detoxification of blood, production of bile to metabolize fats, and synthesis of proteins essential for metabolism, must express a specific set of genes to perform their functions. Gene expression also varies with...
Cell Specific Gene Expression
Multicellular organisms contain a variety of structurally and functionally distinct cell types, but the DNA in all the cells originated from the same parent cells. The differences in the cells can be attributed to the differential gene expression. Liver cells, whose functions include detoxification of blood, production of bile to metabolize fats, and synthesis of proteins essential for metabolism, must express a specific set of genes to perform their functions. Gene expression also varies with...
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...
Cellular Membranes and Drug Transport
Drugs must traverse multiple biological barriers, such as multi-layered skin, single-layered intestinal epithelium, and the plasma membrane, to reach their target sites within the body. The plasma membrane, a highly structured composite of phospholipids, carbohydrates, and proteins, is the cell's protective boundary, facilitating selective substance exchange.
Phospholipids arrange themselves into a bilayer, with hydrophilic heads oriented outward and hydrophobic tails facing inward.
Phospholipids arrange themselves into a bilayer, with hydrophilic heads oriented outward and hydrophobic tails facing inward.


