INVESTIGADORES
RUMBO Martin
congresos y reuniones científicas
Título:
Characterization of leucocyte subpopulations in the early phase of response against Bordetella pertussis infection
Autor/es:
GRISELDA MORENO; ERREA AGUSTINA; ROY ROBERTS; AUGUSTO GRAIEB; LAURYE VAN MAELE; JEAN CLAUDE SIRARD; DANIELA HOZBOR; MARTIN RUMBO
Lugar:
Viña del Mar, Chile.
Reunión:
Congreso; IX Congreso of the Latin American Association of Immunology; 2009
Resumen:
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Although
many aspects of the respiratory disease (named whooping cough) caused by
Bordetella pertussis are well known,
some related to early stages of
infectious process are only partially understood. Our aim was to characterize the cell
populations recovered from broncoalveolar lavage at 2, 6, and 24 h after B.
pertussis mice infection (1.108CFU/40μl). By flow cytometry we observed that the
influx of neutrophils (PMN, CD11c-, CD11b+, GR1+) into the airways was
significant, rising from less than 1.103/lung to 7.105 ± 1.105
cells/lung at 6 h. While at 24 h this value was doubled, alveolar macrophages
population (AM) (CD11c+, CD11b+, GR1-) was diminished. Transcriptional analysis
of immunomagnetic isolated PMN and AM showed an induction of CXCL10 (Fold
induction, FI 300±100), IL1β (FI 150±50), IL6 (FI 20±10) in PMN and overexpression
of IL1β
(FI 25±2), TNFa (FI 50±20) and Cholesterol25hydroxylase (FI 9±2) in AM.
Depletion of PMN by specific monoclonal antibodies before infection, increased
bacterial loads from 7.7±0.12 to 8.4±0.53 logCFU/lung at 24 hs and 7.15 ± 0.21
to 8.36 ± 0.026 log CFU/lung at 48 hs. Our results indicate that PMN
participate actively in elimination of B. pertussis in the early phase of
infection.