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2015 ; 83
(10
): 3918-25
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gab.com Text
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English Wikipedia
Pseudomonas aeruginosa Quorum Sensing Molecule
N-(3-Oxododecanoyl)-L-Homoserine-Lactone Induces HLA-G Expression in Human Immune
Cells
#MMPMID26195547
Bortolotti D
; LeMaoult J
; Trapella C
; Di Luca D
; Carosella ED
; Rizzo R
Infect Immun
2015[Oct]; 83
(10
): 3918-25
PMID26195547
show ga
HLA-G is a nonclassical class I human leukocyte antigen (HLA) involved in
mechanisms of immune tolerance. The objective of this study was to determine
whether N-(3-oxododecanoyl)-l-homoserine lactone (3O-C12-HSL), a quorum sensing
molecule produced by Pseudomonas aeruginosa, could modify HLA-G expression to
control the host immune response. We evaluated the ability of 3O-C12-HSL to
induce HLA-G expression in primary immune cells, monocytes (U937 and THP1), and
T-cell lines (Jurkat) in vitro and analyzed the cellular pathway responsible for
HLA-G expression. We studied the HLA-G promoter with a luciferase assay and
interleukin-10 (IL-10) and p38/CREB signaling with enzyme-linked immunosorbent
assay and immunofluorescence, respectively. We observed that 3O-C12-HSL is able
to induce HLA-G expression in human monocytes and T cells. We showed that the
induction of HLA-G by 3O-C12-HSL is p38/CREB and IL-10 dependent. 3O-C12-HSL
treatment is able to arrest only the U937 cell cycle, possibly due to the
peculiar expression of the ILT2 receptor in the U937 cell line. Our observations
suggest HLA-G as a mechanism to create a protected niche for the bacterial
reservoir, similar to the role of HLA-G molecules during viral infections.