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Comparison of the pulmonary response against lethal and non-lethal intranasal challenges with two different pneumococcal strains.

Abstract：

:The differences between the immune response elicited during a self-limiting and a life-threatening lung infection with Streptococcus pneumoniae was analyzed in a mouse model of intranasal challenge using two different pneumococcal strains. M10, a serotype 11A strain, induced an early response within the first 12h after the challenge, which was characterized by the early local secretion of TNF-alpha and IL-6, followed by a sharp and rapid neutrophil influx. Bacterial loads in the lungs already started to fall at 12h after the challenge and no pneumococci could be recovered after 36h, at the time point when the animals started to show improvement in disease symptoms. ATCC6303, a serotype 3 strain, on the other hand, showed only a late increase in local TNF-alpha and IL-6 levels, when bacterial growth already seems to be out of control. Although cell influx was also observed, neutrophil rise was not as marked as with M10 (type 11A). Pneumococcal loads increased constantly and bacteria started to be recovered from the blood at 30h after the challenge. After this time point, animals showed worsening of symptoms and became lethargic. The resolution of the acute infection could be thus correlated with the early induction of proinflammatory cytokines, which could be due to the presence of a thinner polysaccharide capsule in M10 (type 11A), rendering bacterial components capable of activating the innate immune response more accessible.

journal_name

Microb Pathog

journal_title

Microbial pathogenesis

authors

Ferreira DM,Moreno AT,Cianciarullo AM,Ho PL,Oliveira ML,Miyaji EN

doi

10.1016/j.micpath.2009.05.005

subject

Has Abstract

pub_date

2009-09-01 00:00:00

pages

157-63

issue

3

eissn

0882-4010

issn

1096-1208

pii

S0882-4010(09)00085-0

journal_volume

47

pub_type

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