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2015 ; 5
(ä): 15214
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Expression profiling of lymph nodes in tuberculosis patients reveal inflammatory
milieu at site of infection
#MMPMID26469538
Maji A
; Misra R
; Kumar Mondal A
; Kumar D
; Bajaj D
; Singhal A
; Arora G
; Bhaduri A
; Sajid A
; Bhatia S
; Singh S
; Singh H
; Rao V
; Dash D
; Baby Shalini E
; Sarojini Michael J
; Chaudhary A
; Gokhale RS
; Singh Y
Sci Rep
2015[Oct]; 5
(ä): 15214
PMID26469538
show ga
Extrapulmonary manifestations constitute 15 to 20% of tuberculosis cases, with
lymph node tuberculosis (LNTB) as the most common form of infection. However,
diagnosis and treatment advances are hindered by lack of understanding of LNTB
biology. To identify host response, Mycobacterium tuberculosis infected lymph
nodes from LNTB patients were studied by means of transcriptomics and
quantitative proteomics analyses. The selected targets obtained by comparative
analyses were validated by quantitative PCR and immunohistochemistry. This
approach provided expression data for 8,728 transcripts and 102 proteins,
differentially regulated in the infected human lymph node. Enhanced inflammation
with upregulation of T-helper1-related genes, combined with marked dysregulation
of matrix metalloproteinases, indicates tissue damage due to high immunoactivity
at infected niche. This expression signature was accompanied by significant
upregulation of an immunoregulatory gene, leukotriene A4 hydrolase, at both
transcript and protein levels. Comparative transcriptional analyses revealed
LNTB-specific perturbations. In contrast to pulmonary TB-associated increase in
lipid metabolism, genes involved in fatty-acid metabolism were found to be
downregulated in LNTB suggesting differential lipid metabolic signature. This
study investigates the tissue molecular signature of LNTB patients for the first
time and presents findings that indicate the possible mechanism of disease
pathology through dysregulation of inflammatory and tissue-repair processes.