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2015 ; 12
(2
): 154-69
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Cytomegalovirus immune evasion by perturbation of endosomal trafficking
#MMPMID25263490
Lu?in P
; Mahmutefendi? H
; Blagojevi? Zagorac G
; Ili? Toma? M
Cell Mol Immunol
2015[Mar]; 12
(2
): 154-69
PMID25263490
show ga
Cytomegaloviruses (CMVs), members of the herpesvirus family, have evolved a
variety of mechanisms to evade the immune response to survive in infected hosts
and to establish latent infection. They effectively hide infected cells from the
effector mechanisms of adaptive immunity by eliminating cellular proteins (major
histocompatibility Class I and Class II molecules) from the cell surface that
display viral antigens to CD8 and CD4 T lymphocytes. CMVs also successfully
escape recognition and elimination of infected cells by natural killer (NK)
cells, effector cells of innate immunity, either by mimicking NK cell inhibitory
ligands or by downregulating NK cell-activating ligands. To accomplish these
immunoevasion functions, CMVs encode several proteins that function in the
biosynthetic pathway by inhibiting the assembly and trafficking of cellular
proteins that participate in immune recognition and thereby, block their
appearance at the cell surface. However, elimination of these proteins from the
cell surface can also be achieved by perturbation of their endosomal route and
subsequent relocation from the cell surface into intracellular compartments.
Namely, the physiological route of every cellular protein, including immune
recognition molecules, is characterized by specific features that determine its
residence time at the cell surface. In this review, we summarize the current
understanding of endocytic trafficking of immune recognition molecules and
perturbations of the endosomal system during infection with CMVs and other
members of the herpesvirus family that contribute to their immune evasion
mechanisms.