CELL RECEPTORS - DEFINITION, MECHANISMS AND REGULATION OF RECEPTOR-MEDIATED ENDOCYTOSIS

被引:0
|
作者
FEGER, J [1 ]
GILFALGON, S [1 ]
LAMAZE, C [1 ]
机构
[1] SCRIPPS RES INST, LA JOLLA, CA USA
关键词
RECEPTORS; TRANSDUCTION; ENDOCYTOSIS;
D O I
暂无
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Receptors allow the cells to recognize specific ligands and to receive extracellular messages. They can be classified into five families: 1) receptors for lipidic or lipophilic ligands; 2) the seven transmembrane receptors which mediate their messages by tranduction through the activation of G-proteins, effecters and second messengers to amplify the response; 3) receptors which present an enzymatic activity on their transmembrane domains; 4) channel-receptors, transmembrane oligomeric molecules which let ions flow into the cell and 5) receptors which role is to internalize ligands, whatever their various functions. In parallel a concept of membrane plasticity was developped: vesicles are constantly formed from the plasma membrane, adressing complexes of ligand-recceptors to specific intracellular compartments. This receptor-mediated endocytosis of ligand plays a critical role in regulating the number of a given receptor at the plasma membrane and in the cellular uptake of nutrients, growth factors and hormones. Many pathways exist for these transports but little is known about the signals which select the ligands or the receptors and direct them to their appropriate intracellular destination.
引用
收藏
页码:1039 / 1061
页数:23
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