Neutrophils are Essential in Short Hairpin RNA of Indoleamine 2,3- Dioxygenase Mediated-antitumor Efficiency.

Abstract:

:Indoleamine 2,3-dioxygenase (IDO) is a rate limiting enzyme in tryptophan-degrading pathways and IDO activity results in immune suppression. Targeting IDO is a strategy of cancer immunotherapies. Our previous studies demonstrate that delivery of short hairpin against IDO (IDO shRNA) suppresses tumor growth and increases neutrophils infiltration into tumor. Neutrophils reveal antitumorigenic "N1" or protumorigenic "N2" phenotype in tumor microenvironment. However, the function of IDO shRNA-induced neutrophils is not clear. The LLC1 lung cancer model was used to investigate the role of these neutrophils. Intramuscular injection of IDO shRNA or IDO inhibitor treatment delayed tumor growth and both treatments increased neutrophil infiltration in tumor. Enriched tumor-infiltrating neutrophils expressed both high level of tumor necrosis factor-α and tumor necrosis factor-β (N1 and N2 associated molecules, respectively). In addition, IDO shRNA treatment induced interferon-γ and tryptophan transfer RNA expression in splenocytes. Systematic depletion of neutrophils abolished the IDO shRNA-induced therapeutic effect but did not affect the effect of IDO inhibitor. The levels of interferon-γ and tumor necrosis factor-α were suppressed in IDO shRNA treatment splenocytes after neutrophils depletion. In conclusion, these tumor-infiltrating neutrophils show antitumorigenic phenotype in spleen after IDO shRNA treatment in a murine lung cancer model.

journal_name

Mol Ther Nucleic Acids

authors

Liu KT,Liu YH,Liu HL,Chong IW,Yen MC,Kuo PL

doi

10.1038/mtna.2016.105

subject

Has Abstract

pub_date

2016-12-06 00:00:00

pages

e397

issue

12

issn

2162-2531

pii

S2162-2531(17)30021-5

journal_volume

5

pub_type

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