Interleukin 2 receptors and detergent-resistant membrane domains define a clathrin-independent endocytic pathway - PubMed (original) (raw)
Comparative Study
Interleukin 2 receptors and detergent-resistant membrane domains define a clathrin-independent endocytic pathway
C Lamaze et al. Mol Cell. 2001 Mar.
Free article
Abstract
Clathrin-dependent endocytosis has long been presented as the only efficient mechanism by which transmembrane receptors are internalized. We selectively blocked this process using dominant-negative mutants of Eps15 and showed that clathrin-mediated endocytosis of transferrin was inhibited, while endocytosis of interleukin 2 (IL2) receptors proceeded normally. Ultrastructural and biochemical experiments showed that clathrin-independent endocytosis of IL2 receptors exists constitutively in lymphocytes and is coupled to their association with detergent-resistant membrane domains. Finally, clathrin-independent endocytosis requires dynamin and is specifically regulated by Rho family GTPases. These results define novel properties of receptor-mediated endocytosis and establish that the IL2 receptor is efficiently internalized through this clathrin-independent pathway.
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