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2015 ; 290
(23
): 14407-17
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Mycobacterium tuberculosis TlyA Protein Negatively Regulates T Helper (Th) 1 and
Th17 Differentiation and Promotes Tuberculosis Pathogenesis
#MMPMID25847237
Rahman MA
; Sobia P
; Dwivedi VP
; Bhawsar A
; Singh DK
; Sharma P
; Moodley P
; Van Kaer L
; Bishai WR
; Das G
J Biol Chem
2015[Jun]; 290
(23
): 14407-17
PMID25847237
show ga
Mycobacterium tuberculosis, the causative agent of tuberculosis, is an ancient
pathogen and a major cause of death worldwide. Although various virulence factors
of M. tuberculosis have been identified, its pathogenesis remains incompletely
understood. TlyA is a virulence factor in several bacterial infections and is
evolutionarily conserved in many Gram-positive bacteria, but its function in M.
tuberculosis pathogenesis has not been elucidated. Here, we report that TlyA
significantly contributes to the pathogenesis of M. tuberculosis. We show that a
TlyA mutant M. tuberculosis strain induces increased IL-12 and reduced IL-1? and
IL-10 cytokine responses, which sharply contrasts with the immune responses
induced by wild type M. tuberculosis. Furthermore, compared with wild type M.
tuberculosis, TlyA-deficient M. tuberculosis bacteria are more susceptible to
autophagy in macrophages. Consequently, animals infected with the TlyA mutant M.
tuberculosis organisms exhibited increased host-protective immune responses,
reduced bacillary load, and increased survival compared with animals infected
with wild type M. tuberculosis. Thus, M. tuberculosis employs TlyA as a host
evasion factor, thereby contributing to its virulence.