RNAi-Mediated PD-L1 Inhibition for Pancreatic Cancer Immunotherapy.

Abstract:

:The recent past has seen impressive progress in the treatment of various malignancies using immunotherapy. One of the most promising approaches involves immune checkpoint inhibitors. However, the clinical results with these agents have demonstrated variability in the response. Pancreatic cancer, in particular, has proven resistant to initial immunotherapy approaches. Here, we describe an alternative strategy that relies on combining gemcitabine and a novel programmed death-ligand 1 (PD-L1) inhibitor, termed MN-siPDL1. MN-siPDL1 incorporates small interfering RNA against PD-L1 (siPDL1) conjugated to a magnetic nanocarrier (MN). We show that noninvasive magnetic resonance imaging (MRI) could be used to monitor therapeutic response. Combination therapy consisting of gemcitabine and MN-siPDL1 in a syngeneic murine pancreatic cancer model resulted in a significant reduction in tumor growth and an increase in survival. Following optimization, a 90% reduction in tumor volume was achieved 2 weeks after the beginning of treatment. Whereas 100% of the control animals had succumbed to their tumors by week 6 after the beginning of treatment, there was no mortality in the experimental group by week 5, and 67% of the experimental animals survived for 12 weeks. This method could provide therapeutic benefit against an intractable disease for which there are no effective treatments and which is characterized by a mere 1% 5-year survival.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Yoo B,Jordan VC,Sheedy P,Billig AM,Ross A,Pantazopoulos P,Medarova Z

doi

10.1038/s41598-019-41251-9

subject

Has Abstract

pub_date

2019-03-18 00:00:00

pages

4712

issue

1

issn

2045-2322

pii

10.1038/s41598-019-41251-9

journal_volume

9

pub_type

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