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Division of Molecular Immunology, La Jolla Institute for Allergy and Immunology, San Diego, CA 92121
LIGHT is a member of the TNF cytokine superfamily that
signals through the lymphotoxin (LT)
receptor and the herpesvirus
entry mediator. LIGHT may function as a costimulatory factor for the
activation of lymphoid cells and as a deterrent to infection by
herpesvirus, which may provide significant selective pressure shaping
the evolution of LIGHT. Here, we define the molecular genetics of the
human LIGHT locus, revealing its close linkage to the
TNF superfamily members CD27 ligand and 4-1BB
ligand, and the third complement protein
(C3), which positions LIGHT within the MHC paralog on
chromosome 19p13.3. An alternately spliced isoform of LIGHT mRNA that
encodes a transmembrane-deleted form is detected in activated T cells
and gives rise to a nonglycosylated protein that resides in the
cytosol. Furthermore, membrane LIGHT is shed from the cell surface of
human 293 T cells. These studies reveal new mechanisms involved in
regulating the physical forms and cellular compartmentalization of
LIGHT that may contribute to the regulation and biological function of
this cytokine.
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