Journal
CURRENT OPINION IN CELL BIOLOGY
Volume 15, Issue 2, Pages 128-135Publisher
CURRENT BIOLOGY LTD
DOI: 10.1016/S0955-0674(03)00004-8
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Binding of external factors to cell membrane receptors triggers intracellular signalling pathways that ultimately determine if the cell proliferates, differentiates or undergoes apoptosis. Activated receptors also initiate a cascade of events, called negative receptor signalling, that decreases the amplitude of positive signals and modulates the level of cell stimulation. Recent studies have revealed that negative signalling by receptor tyrosine kinases involves coordinated action of ubiquitin ligases (i.e. Cbl), adaptor proteins (i.e. Grb2 and CIN85), inhibitory molecules (i.e. Sprouty), cytoplasmic kinases (i.e. activated Cdc42-associated kinase) and phosphoinositol metabolites. These inhibitory signals are essential for normal cell functioning, and their deregulation often results in human diseases.
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