[Effect of the Expression of
iNOS Induced by
Mycobacterium tuberculosis CRISPR-associated
Csm4 (
Rv2820
c) on Intracellular Viability of
Mycobacterium smegmatis].
SICHUAN DA XUE XUE BAO. YI XUE BAN = JOURNAL OF SICHUAN UNIVERSITY. MEDICAL SCIENCE EDITION 2018;
49:319-324. [PMID:
30014627]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
OBJECTIVE
To determine how Csm4 protein expression affects intracellular survival of Mycobacterium smegmatis(MS).
METHODS
Csm 4 gene was amplified by PCR to construct pMV261-Csm4 shuttle expression plasmid. The Csm4 protein expression in MS_Csm4 was detected by Western blot after electroporation of the recombinant plasmid into MS. The growth kinetics of MS_Csm4 in vitro and the influence of reactive N,O species on the growth of MS_Csm4were observed. The intracellular survival of MS_Csm4 and expressions of inducible nitric oxide synthase gene (iNOS) and nitric oxide production (NO) were detected after infection with THP-1 macrophages.
RESULTS
Csm4 protein was successfully expressed in MS_Csm4,which did not affect the growth of the recombinant MS. Reactive N,O species decreased MS_Csm4 colony forming unit (CFU) in vitro. THP-1 increased the expression of iNOS and NO production and decreased intracellular survival of MS_Csm4.
CONCLUSION
Recombinant MS_Csm4 is susceptible to reactive N,O species in vitro. THP-1 promotes NO release and thus discourages intracellular survival of MS.
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