Once at the plasma membrane, peptide-loaded MHC-II (pMHC-II) complexes are displayed for recognition by CD4 T cells. T cells are exquisitely sensitive and are capable of recognizing very small amounts of pMHC-II. We first reported that pMHC-II is constitutively associated with plasma membrane microdomains, termed lipid rafts, and that raft association increases the local density of pMHC-II to support T cell activation by small numbers of pMHC-II complexes. We have been following the kinetics of pMHC-II complex formation in living cells from their initial site of formation in intracellular antigen processing compartments until their movement and deposition in the plasma membrane of dendritic cells. We have found that newly-generated pMHC-II complexes first arrive at the plasma membrane in small microclusters that remain stable over time. These microclusters are stabilized by cholesterol/lipid interactions, as perturbing cholesterol levels disrups these pMHC-II microclusters. Our current goal is to identify the molecular signals that regulate pMHC-II association with lipid membrane domains.

Agency
National Institute of Health (NIH)
Institute
National Cancer Institute (NCI)
Type
Investigator-Initiated Intramural Research Projects (ZIA)
Project #
1ZIABC011033-10
Application #
9556431
Study Section
Project Start
Project End
Budget Start
Budget End
Support Year
10
Fiscal Year
2017
Total Cost
Indirect Cost
Name
Basic Sciences
Department
Type
DUNS #
City
State
Country
Zip Code
Bandola-Simon, Joanna; Roche, Paul A (2018) Dysfunction of antigen processing and presentation by dendritic cells in cancer. Mol Immunol :
Lei, Lei; Bandola-Simon, Joanna; Roche, Paul A (2018) Ubiquitin-conjugating enzyme E2 D1 (Ube2D1) mediates lysine-independent ubiquitination of the E3 ubiquitin ligase March-I. J Biol Chem 293:3904-3912
Kaul, Sunil; Mittal, Sharad K; Roche, Paul A (2018) A major isoform of the E3 ubiquitin ligase March-I in antigen-presenting cells has regulatory sequences within its gene. J Biol Chem 293:4478-4485
Klein, Ofir; Roded, Amit; Zur, Neta et al. (2017) Rab5 is critical for SNAP23 regulated granule-granule fusion during compound exocytosis. Sci Rep 7:15315
Cresswell, Peter; Roche, Paul A (2017) Editorial Overview: Antigen Processing and Presentation; many fingers in many pies. Curr Opin Immunol 46:v-vii
Da, Q; Shaw, T; Pradhan, S et al. (2017) Disruption of protein complexes containing protein phosphatase 2B and Munc18c reduces the secretion of von Willebrand factor from endothelial cells. J Thromb Haemost 15:1032-1039
Roche, Paul A; Cresswell, Peter (2016) Antigen Processing and Presentation Mechanisms in Myeloid Cells. Microbiol Spectr 4:
Anderson, Howard A; Roche, Paul A (2015) MHC class II association with lipid rafts on the antigen presenting cell surface. Biochim Biophys Acta 1853:775-80
Roche, Paul A; Furuta, Kazuyuki (2015) The ins and outs of MHC class II-mediated antigen processing and presentation. Nat Rev Immunol 15:203-16
Bosch, Berta; Heipertz, Erica L; Drake, James R et al. (2013) Major histocompatibility complex (MHC) class II-peptide complexes arrive at the plasma membrane in cholesterol-rich microclusters. J Biol Chem 288:13236-42

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