Journal
IMMUNOLOGY
Volume 152, Issue 1, Pages 36-51Publisher
WILEY
DOI: 10.1111/imm.12746
Keywords
microsomal prostaglandin E synthase-1; natural killer T cells; pancreatic cancer; prevention; treatment
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Funding
- College of Medicine Alumni Association award
- Kerley-Cade Chair Endowment
- National Institute of General Medical Sciences of the National Institutes of Health [8P20GM103447]
- [NCI-CN-53300]
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The role of the unique T-cell population, natural killer T (NKT) cells, which have similar functions to NK cells in pancreatic cancer (PC), is not yet evaluated. To address the regulatory roles of NKT cells on tumour progression through tumour-associated macrophages (TAM) and their production of microsomal prostaglandin E synthase-1 (mPGES-1) and 5-lipoxygenase (5-LOX) in (Kras)-driven pancreatic tumour (KPT) progression, we crossed CD1d(-/-) mice deficient in both invariant and variant NKT cells with the Kras(G12D) mice. Loss of NKT cells significantly increased pancreatic intraepithelial neoplasia (PanIN) lesions and also increased 5-LOX and mPGES-1 expression in M2-type macrophages and cancer stem-like cells in pancreatic tumours. Pharmacological inhibition of mPGES-1 and 5-LOX in M2 macrophages with specific inhibitor YS-121 in KPT-CD1d(-/-) mice decreased PanIN lesions and suppressed tumour growth in association with elevated levels of active CD8a cells. Hence, NKT cells regulate PC by modulating TAMs (M2) through mPGES-1 and 5-LOX; and the absence of NKT cells leads to aggressive development of PC.
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