INVESTIGADORES
FOSSATI Carlos Alberto
congresos y reuniones científicas
Título:
CHEMOKINE AND MATRIX METALLOPROTEINASE RESPONSE OF SWAN-71 TROPHOBLASTIC CELLS TO INFECTION WITH BRUCELLA ABORTUS AND TO FACTORS PRODUCED BY BRUCELLA-INFECTED MONOCYTES
Autor/es:
FERNANDEZ AG; FERRERO MC,; HIELPOS S; DELPINO MV,; FOSSATI CA; BALDI PC,
Lugar:
Los Cocos, Córdoba
Reunión:
Congreso; LXI Reunión Anual de la Sociedad Argentina de Inmunología; 2013
Institución organizadora:
Sociedad Argentina de Inmunología
Resumen:
Brucella is well known to produce abortion in humans and animals, presumably by
inducing a proinflammatory response that affects fetus viability. In this work
we evaluated the cytokine and matrix metalloproteinase (MMP) response of human
trophoblasts to Brucella infection. Swan-71, a human trophoblastic
cell line, was infected with B. abortus at multiplicities of infection
(MOI) from 50 to 500. After treatment with gentamicin, cells were lysed at
different times post-infection (p.i.) and lysates were plated onto
bacteriological agar. For each time point, intracellular CFU increased with
increasing MOI. In addition, CFU counts increased between 2 and 24 h p.i.,
indicating the capacity of Brucella to replicate in trophoblasts. This
finding was confirmed by confocal microscopy using DsRed-labeled Brucella.
A significant increase of TNF-α (p<0.05) levels
was detected in supernatants from infected cells (MOI 100 and 500), whereas
IL-8, MCP-1 and IL-10 did not increase. MMP-9 activity as detected by
zymography was unchanged except for a decrease at MOI 500 (p<0.05). To
verify the capacity of trophoblasts to respond to PAMPs, Swan-71 were
stimulated with different TLRs agonists. An increase of IL-8 was detected after
stimulation with Pam3Cys and flagellin (p<0.01), with no change in IL-10 and
TNF-α. No response to E. coli LPS
was detected. To evaluate the interaction of trophoblasts and monocytes during
infection (a feasible situation in the maternal-fetus interface), Swan-71 were
stimulated with supernatants from Brucella-infected THP-1 cells (a monocytic
cell line), detecting an increase in IL-8, MCP-1 (p<0.001) and MMP-9
(p<0.05) but no change in IL-10 and TNF-α. These findings
suggest that Swan-71 cells produce TNF-α upon Brucella infection
and secrete chemokines and MMP-9 upon interaction with Brucella-infected
monocytes. The resulting inflammatory environment, together with modifications
in MMPs levels,