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2016 ; 7
(1
): 374-85
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Salmonella overcomes tumor immune tolerance by inhibition of tumor indoleamine 2,
3-dioxygenase 1 expression
#MMPMID26517244
Kuan YD
; Lee CH
Oncotarget
2016[Jan]; 7
(1
): 374-85
PMID26517244
show ga
Over the past decades, Salmonella has been proven capable of inhibiting tumor
growth. It can specifically target tumors and due to its facultative anaerobic
property, can be more penetrative than other drug therapies. However, the
molecular mechanism by which Salmonella inhibits tumor growth is still
incompletely known. The antitumor therapeutic effect mediated by Salmonella is
associated with an inflammatory immune response at the tumor site and a T
cell-dependent immune response. Many tumors have been proven to have a high
expression of indoleamine 2, 3-dioxygenase 1 (IDO), which is a rate-limiting
enzyme that catalyzes tryptophan to kynurenine, thus causing immune tolerance
within the tumor microenvironment. With decreased expression of IDO, increased
immune response can be observed, which might be helpful when developing cancer
immunotherapy. The expression of IDO was decreased after tumor cells were
infected with Salmonella. In addition, Western blot analysis showed that the
expression levels of phospho-protein kinase B (P-AKT), phospho-mammalian targets
of rapamycin (P-mTOR), and phospho-p70 ribosomal s6 kinase (P-p70s6K) in tumor
cells were decreased after Salmonella infection. In conclusion, our results
indicate that Salmonella inhibits IDO expression and plays a crucial role in
anti-tumor therapy, which might be a promising strategy combined with other
cancer treatments.