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https://www.readbyqxmd.com/read/19553546/direct-antigen-presentation-and-gap-junction-mediated-cross-presentation-during-apoptosis
#1
Baoxu Pang, Joost Neijssen, Xiaohang Qiao, Lennert Janssen, Hans Janssen, Christoph Lippuner, Jacques Neefjes
MHC class I molecules present peptides from endogenous proteins. Ags can also be presented when derived from extracellular sources in the form of apoptotic bodies. Cross-presentation of such Ags by dendritic cells is required for proper CTL responses. The fate of Ags in cells initiated for apoptosis is unclear as is the mechanism of apoptosis-derived Ag transfer into dendritic cells. Here we show that novel Ags can be generated by caspases and be presented by MHC class I molecules of apoptotic cells. Since gap junctions function until apoptotic cells remodel to form apoptotic bodies, transfer and cross-presentation of apoptotic peptides by neighboring and dendritic cells occurs...
July 15, 2009: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/17467043/gap-junction-mediated-intercellular-communication-in-the-immune-system
#2
REVIEW
Joost Neijssen, Baoxu Pang, Jacques Neefjes
Immune cells are usually considered non-attached blood cells, which would exclude the formation of gap junctions. This is a misconception since many immune cells express connexin 43 (Cx43) and other connexins and are often residing in tissue. The role of gap junctions is largely ignored by immunologists as is the immune system in the field of gap junction research. Here, the current knowledge of the distribution of connexins and the function of gap junctions in the immune system is discussed. Gap junctions appear to play many roles in antibody productions and specific immune responses and may be important in sensing danger in tissue by the immune system...
May 2007: Progress in Biophysics and Molecular Biology
https://www.readbyqxmd.com/read/15744304/cross-presentation-by-intercellular-peptide-transfer-through-gap-junctions
#3
Joost Neijssen, Carla Herberts, Jan Wouter Drijfhout, Eric Reits, Lennert Janssen, Jacques Neefjes
Major histocompatibility complex (MHC) class I molecules present peptides that are derived from endogenous proteins. These antigens can also be transferred to professional antigen-presenting cells in a process called cross-presentation, which precedes initiation of a proper T-cell response; but exactly how they do this is unclear. We tested whether peptides can be transferred directly from the cytoplasm of one cell into the cytoplasm of its neighbour through gap junctions. Here we show that peptides with a relative molecular mass of up to approximately 1,800 diffuse intercellularly through gap junctions unless a three-dimensional structure is imposed...
March 3, 2005: Nature
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