Therapeutic Administration of a Monoclonal Anti-Il-1ß Antibody Protects Against Experimental Melioidosis.
Shock
; 46(5): 566-574, 2016 11.
Article
em En
| MEDLINE
| ID: mdl-27219859
ABSTRACT
BACKGROUND:
Melioidosis, caused by the gram-negative bacterium Burkholderia pseudomallei, is a common cause of community-acquired sepsis in Southeast Asia and Northern Australia. The NLRP3 inflammasome and its downstream product interleukin-1 beta (IL-1ß) have been proposed to play crucial roles in melioidosis. In this study, we characterized the role of IL-1ß more closely and we assessed its therapeutic potential.METHODS:
mRNA expression of inflammasome components was determined in isolated leukocytes of 32 healthy controls and 34 patients with sepsis caused by B pseudomallei.Wild-type (WT), NLRP3-deficient (Nlrp3), and Asc mice were infected with B pseudomallei. In additional experiments, infected WT mice were treated with an anti-IL-1ß antibody. After 24, 48, and 72âhours (h) mice were sacrificed and organs were harvested. Furthermore, survival studies were performed.RESULTS:
Patients with melioidosis exhibited lower mRNA levels of caspase-1, NLRP3, and ASC. Bacterial dissemination and organ damage were increased in B pseudomallei-infected Nlrp3 and Asc mice, together with a reduced pulmonary cell influx. Anti-IL-1ß treatment of B pseudomallei challenged mice resulted in strongly reduced bacterial counts, organ damage, and pulmonary granulocyte influx together with reduced mortality. Postponement of anti-IL-1ß treatment for 24âh postinfection still protected mice during melioidosis.CONCLUSION:
Expression of caspase-1, NLRP3, and ASC is altered in melioidosis patients. In mice, both NLRP3 and ASC contribute to the host defense against melioidosis. Anti-IL-1ß treatment protects mice against B pseudomallei infection and might be a novel treatment strategy in melioidosis.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Interleucina-1beta
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Melioidose
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Anticorpos Monoclonais
Limite:
Adolescent
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Adult
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Aged
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Animals
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Humans
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Middle aged
Idioma:
En
Ano de publicação:
2016
Tipo de documento:
Article