2009 September ; 10(9): 597–608. | Barth D. Grant* and Julie G. Donaldson$
The article reviews the pathways and mechanisms of endocytic recycling, which is crucial for maintaining the composition of the plasma membrane and various cellular processes. Endocytic recycling can occur through clathrin-dependent (CDE) and clathrin-independent (CIE) pathways. CDE involves the internalization of proteins and lipids into clathrin-coated vesicles, while CIE includes mechanisms like caveolar endocytosis and dynamin-independent endocytosis. Recent studies have highlighted the importance of regulated recycling in processes such as cytokinesis, cell adhesion, morphogenesis, cell fusion, and learning and memory. The early endosome serves as a sorting station for cargo, with Rab5 and PI3K marking it and facilitating sorting. Rapid recycling routes, such as those involving Rab4 and Rab35, allow for immediate return of cargo to the plasma membrane, while slow recycling routes involve transport to the juxtanuclear endocytic recycling compartment (ERC). Arf6 plays a key role in CIE recycling, regulating phospholipase D and phosphatidylinositol 4-phosphate (PIP4) to facilitate membrane fission and fusion. Polarity proteins and other regulators also contribute to the regulation of endocytic recycling. The article discusses the involvement of endocytic recycling in specific biological processes, such as cytokinesis, cell adhesion, myoblast fusion, and learning and memory, emphasizing the importance of these pathways in maintaining cellular function and development.The article reviews the pathways and mechanisms of endocytic recycling, which is crucial for maintaining the composition of the plasma membrane and various cellular processes. Endocytic recycling can occur through clathrin-dependent (CDE) and clathrin-independent (CIE) pathways. CDE involves the internalization of proteins and lipids into clathrin-coated vesicles, while CIE includes mechanisms like caveolar endocytosis and dynamin-independent endocytosis. Recent studies have highlighted the importance of regulated recycling in processes such as cytokinesis, cell adhesion, morphogenesis, cell fusion, and learning and memory. The early endosome serves as a sorting station for cargo, with Rab5 and PI3K marking it and facilitating sorting. Rapid recycling routes, such as those involving Rab4 and Rab35, allow for immediate return of cargo to the plasma membrane, while slow recycling routes involve transport to the juxtanuclear endocytic recycling compartment (ERC). Arf6 plays a key role in CIE recycling, regulating phospholipase D and phosphatidylinositol 4-phosphate (PIP4) to facilitate membrane fission and fusion. Polarity proteins and other regulators also contribute to the regulation of endocytic recycling. The article discusses the involvement of endocytic recycling in specific biological processes, such as cytokinesis, cell adhesion, myoblast fusion, and learning and memory, emphasizing the importance of these pathways in maintaining cellular function and development.