Cultivation of the smooth colony Mycobacterium abscessus
at the sub-minimum inhibitory concentration (MIC) of amikacin
changed its growth pattern including its colony morphology
(smooth to rough) and cell arrangement (dispersed
to cord formation). In addition, reduced sliding motility and
biofilm formation were observed. The amount of glycogpetidolipid
(GPL) and mRNA expression of key genes involved
in GPL synthesis were decreased in the amikacin-treated M.
abscessus strain. An in vitro infection assay revealed that the
amikacin-treated smooth M. abscessus strain induced more
pro-inflammatory cytokines (TNF-α, IL-1β, IL-6) than that
of the smooth strain in murine macrophage cells. These results
suggest that long-term exposure to a low concentration of
amikacin causes a physical change in the cell wall which may
increase its virulence.
Citations
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