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J Infect Dis. 2014 Mar;209(6):905-12. doi: 10.1093/infdis/jit614. Epub 2013 Nov 18.

In vivo evaluation of antibiotic activity against Mycobacterium abscessus.

Author information

1
Laboratoire de Bactériologie-Hygiène, Faculté de Médecine, Université Pierre et Marie Curie.

Abstract

BACKGROUND:

The prognosis of Mycobacterium abscessus infections is poor due to the lack of effective drug treatment. The objective of this study was to set up an animal model suitable to test antibiotic activity against M. abscessus.

METHODS:

The following mouse strains were evaluated: Swiss, BALB/c, C57BL/6, nude, beige, A/J, and GKO. Antibiotic activity was tested for clarithromycin, amikacin, cefoxitin, tigecycline, and bedaquiline (TMC207). Finally, we evaluated the 3-drug combination clarithromycin, cefoxitin, and amikacin.

RESULTS:

Nude and GKO mice fulfilled criteria for the model but only nude mice offered sufficient availability for large therapeutic experiments. Among the 3 drugs usually combined for treatment of M. abscessus infection, cefoxitin was the most active because it improved survival and reduced bacillary loads in spleen whereas clarithromycin and amikacin prevented death but had little impact on bacillary loads. The triple-drug combination was not more active than cefoxitin alone. Tigecycline displayed bactericidal activity whereas bedaquiline was almost inactive.

CONCLUSIONS:

Nude mice are an adequate model for in vivo chemotherapy studies. Among tested drugs, cefoxitin and tigecycline showed promising in vivo activity against M. abscessus. The best drug combination remains to be determined.

KEYWORDS:

Mycobacterium abscessus; TMC207; amikacin; bedaquiline; cefoxitin; clarithromycin; cystic fibrosis; murine model; nude mouse; tigecycline

PMID:
24253289
DOI:
10.1093/infdis/jit614
[Indexed for MEDLINE]

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