Analysis of Na+,K+-ATPase Motion and Incorporation into the Plasma Membrane in Response to G Protein–coupled Receptor Signals in Living CellsV⃞
AUTOR(ES)
Bertorello, Alejandro M.
FONTE
The American Society for Cell Biology
RESUMO
Dopamine (DA) increases Na+,K+-ATPase activity in lung alveolar epithelial cells. This effect is associated with an increase in Na+,K+-ATPase molecules within the plasma membrane (Ridge et al., 2002). Analysis of Na+,K+-ATPase motion was performed in real-time in alveolar cells stably expressing Na+,K+-ATPase molecules carrying a fluorescent tag (green fluorescent protein) in the α-subunit. The data demonstrate a distinct (random walk) pattern of basal movement of Na+,K+-ATPase–containing vesicles in nontreated cells. DA increased the directional movement (by 3.5 fold) of the vesicles and an increase in their velocity (by 25%) that consequently promoted the incorporation of vesicles into the plasma membrane. The movement of Na+,K+-ATPase–containing vesicles and incorporation into the plasma membrane were microtubule dependent, and disruption of this network perturbed vesicle motion toward the plasma membrane and prevented the increase in the Na+,K+-ATPase activity induced by DA. Thus, recruitment of new Na+,K+-ATPase molecules into the plasma membrane appears to be a major mechanism by which dopamine increases total cell Na+,K+-ATPase activity.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=151586Documentos Relacionados
- G protein-coupled receptors regulate Na+,K+-ATPase activity and endocytosis by modulating the recruitment of adaptor protein 2 and clathrin
- Regulation of endocytic pH by the Na+,K+-ATPase in living cells.
- Increased pressure on G protein-coupled receptor kinases.
- The Rat Cytomegalovirus R33-Encoded G Protein-Coupled Receptor Signals in a Constitutive Fashion
- G protein-coupled receptor kinase-5 regulates thrombin-activated signaling in endothelial cells