Insect lipoprotein follows a transferrin-like recycling pathway that is mediated by the insect LDL receptor homologue.
Authors:Van Hoof D, Rodenburg KW, Van der Horst DJ
Journal:J Cell Sci
PubMed ID:12356906
'The lipoprotein of insects, high-density lipophorin (HDLp), is homologous to that of mammalian low-density lipoprotein (LDL) with respect to its apolipoprotein structure. Moreover, an endocytic receptor for HDLp has been identified (insect lipophorin receptor, iLR) that is homologus to the LDL receptor. We transfected LDL-receptor-expressing CHO cells with iLR cDNA ... More
Distinct pathways of antigen uptake and intracellular routing in CD4 and CD8 T cell activation.
Authors:Burgdorf S, Kautz A, Böhnert V, Knolle PA, Kurts C
Journal:Science
PubMed ID:17463291
The mechanisms that allow antigen-presenting cells (APCs) to selectively present extracellular antigen to CD8+ effector T cells (cross-presentation) or to CD4+ T helper cells are not fully resolved. We demonstrated that APCs use distinct endocytosis mechanisms to simultaneously introduce soluble antigen into separate intracellular compartments, which were dedicated to presentation ... More
Cholesterol level regulates endosome motility via Rab proteins.
Authors:Chen H, Yang J, Low PS, Cheng JX,
Journal:Biophys J
PubMed ID:17981910
The role of cholesterol in the regulation of endosome motility was investigated by monitoring the intracellular trafficking of endocytosed folate receptors (FRs) labeled with fluorescent folate conjugates. Real-time fluorescence imaging of HeLa cells transfected with green fluorescent protein-tubulin revealed that FR-containing endosomes migrate along microtubules. Moreover, microinjection with antibodies that ... More
Dynamics and mechanisms of quantum dot nanoparticle cellular uptake.
Authors:Xiao Y, Forry SP, Gao X, Holbrook RD, Telford WG, Tona A,
Journal:J Nanobiotechnology
PubMed ID:20550705
ABSTRACT: BACKGROUND: The rapid growth of the nanotechnology industry and the wide application of various nanomaterials have raised concerns over their impact on the environment and human health. Yet little is known about the mechanism of cellular uptake and cytotoxicity of nanoparticles. An array of nanomaterials has recently been introduced ... More
Plasma membrane associated location of sulfonated meso-tetraphenylporphyrins of different hydrophilicity probed by total internal reflection fluorescence spectroscopy.
Sulfonated meso-tetraphenylporphyrins of different hydrophilicity were microspectrofluorimetrically examined in endothelial cells using total internal reflection (TIR) illumination or epi-illumination. Since the penetration depth of the evanescent field during TIR illumination is limited to a few hundred nanometers, photosensitizers were almost selectively examined in close vicinity to the plasma membrane. Pronounced ... More