Authors:Austin CD, Lawrence DA, Peden AA, Varfolomeev EE, Totpal K, De Mazière AM, Klumperman J, Arnott D, Pham V, Scheller RH, Ashkenazi A
Journal:Proc Natl Acad Sci U S A
PubMed ID:16801533
'Endocytosis is crucial for various aspects of cell homeostasis. Here, we show that proapoptotic death receptors (DRs) trigger selective destruction of the clathrin-dependent endocytosis machinery. DR stimulation induced rapid, caspase-mediated cleavage of key clathrin-pathway components, halting cellular uptake of the classic cargo protein transferrin. DR-proximal initiator caspases cleaved the clathrin ... More
Persistent cAMP-signals triggered by internalized G-protein-coupled receptors.
'G-protein-coupled receptors (GPCRs) are generally thought to signal to second messengers like cyclic AMP (cAMP) from the cell surface and to become internalized upon repeated or prolonged stimulation. Once internalized, they are supposed to stop signaling to second messengers but may trigger nonclassical signals such as mitogen-activated protein kinase (MAPK) ... More
Receptor and membrane recycling can occur with unaltered efficiency despite dramatic Rab5(q79l)-induced changes in endosome geometry.
Authors:Ceresa BP, Lotscher M, Schmid SL
Journal:J Biol Chem
PubMed ID:11136733
'Current models for sorting in the endosomal compartment suggest that endosomal geometry plays a significant role as membrane-bound proteins accumulate in tubular regions for recycling, and lumenal markers accumulate in large vacuolar portions for delivery to lysosomes. Rab5, a small molecular weight GTPase, functions in the formation and maintenance of ... More
SLAM is a microbial sensor that regulates bacterial phagosome functions in macrophages.
Authors:Berger SB, Romero X, Ma C, Wang G, Faubion WA, Liao G, Compeer E, Keszei M, Rameh L, Wang N, Boes M, Regueiro JR, Reinecker HC, Terhorst C,
Journal:Nat Immunol
PubMed ID:20818396
'Phagocytosis is a pivotal process by which macrophages eliminate microorganisms after recognition by pathogen sensors. Here we unexpectedly found that the self ligand and cell surface receptor SLAM functioned not only as a costimulatory molecule but also as a microbial sensor that controlled the killing of gram-negative bacteria by macrophages. ... More
The small GTPase Rab22 interacts with EEA1 and controls endosomal membrane trafficking.
Authors:Kauppi M, Simonsen A, Bremnes B, Vieira A, Callaghan J, Stenmark H, Olkkonen VM
Journal:J Cell Sci
PubMed ID:11870209
'Rab22a is a small GTPase that is expressed ubiquitously in mammalian tissues and displays the highest sequence homology to Rab5. In BHK-21 cells, overexpression of the wild-type Rab22a caused formation of abnormally large vacuole-like structures containing the early-endosomal antigen EEA1 but not Rab11, a marker of recycling endosomes or the ... More