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2017 ; 7
(1
): 9844
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Label-free optical vibrational spectroscopy to detect the metabolic state of M
tuberculosis cells at the site of disease
#MMPMID28852109
Baron VO
; Chen M
; Clark SO
; Williams A
; Hammond RJH
; Dholakia K
; Gillespie SH
Sci Rep
2017[Aug]; 7
(1
): 9844
PMID28852109
show ga
Tuberculosis relapse is a barrier to shorter treatment. It is thought that lipid
rich cells, phenotypically resistant to antibiotics, may play a major role. Most
studies investigating relapse use sputum samples although tissue bacteria may
play an important role. We developed a non-destructive, label-free technique
combining wavelength modulated Raman (WMR) spectroscopy and fluorescence
detection (Nile Red staining) to interrogate Mycobacterium tuberculosis cell
state. This approach could differentiate single "dormant" (lipid rich, LR) and
"non-dormant" (lipid poor, LP) cells with high sensitivity and specificity. We
applied this to experimentally infected guinea pig lung sections and were able to
distinguish both cell types showing that the LR phenotype dominates in infected
tissue. Both in-vitro and ex-vivo spectra correlated well, showing for the first
time that Mycobacterium tuberculosis, likely to be phenotypically resistant to
antibiotics, are present in large numbers in tissue. This is an important step in
understanding the pathology of relapse supporting the idea that they may be
caused by M. tuberculosis cells with lipid inclusions.