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Published in: Journal of Nanoparticle Research 6/2023

01-06-2023 | Research paper

Phytoglycogen-dsRNA nanoparticles demonstrate differential cytotoxicity and immunostimulatory potential in two ovarian cancer cell lines

Authors: A. Lewis, A. Tran, N. L. Aldor, N. A. Jadaa, T. Feng, E. Moore, S. J. DeWitte-Orr, S. J. Poynter

Published in: Journal of Nanoparticle Research | Issue 6/2023

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Abstract

Ovarian cancer is a leading cause of cancer mortality in women, and novel treatments with improved efficacy are needed to fight ovarian cancer. Double-stranded (ds) RNA, including the synthetic polyinosinic cytidylic acid (poly (I:C), has shown promise as a cancer therapeutic. Phytoglycogen derived from sweet corn, nanodendrix (NDX) is a carrier for dsRNA. The responsiveness to NDX-delivered poly (I:C), NDX-poly (I:C), was tested in two ovarian cancer cell lines, SKOV-3 and OVCAR-3, previously identified as dsRNA-resistant and dsRNA-sensitive, respectively. NDX bound poly (I:C) at a w/w ratio of 2:1 NDX:poly (I:C) and poly (I:C)-NDX was tested for biological activity through uptake and two therapeutic modes of action, cytotoxicity, and immune stimulation. Immunocytochemistry demonstrated both cells bound to poly (I:C)-NDX. In OVCAR-3, poly (I:C)-NDX caused significant cell death, even at concentrations as low as 62.5 ng/mL; no cell death was observed with poly (I:C) alone at concentrations up to 5 μg/mL in SKOV-3 and 0.5 μg/mL in OVCAR-3. In both cell lines poly (I:C)-NDX stimulated the production of CXCL10 protein and transcripts, an innate immune chemokine, and at significantly higher levels than poly (I:C) alone. Interestingly, in response to poly (I:C)-NDX SKOV-3 produced a more robust immune response and higher levels of capase-3/-7 activation compared to OVCAR-3, despite showing no significant cell death. Poly (I:C)-NDX represents a robust and multifunctional therapy, potentiating poly (I:C) and sensitizing resistant cells. Additionally, the SKOV-3 and OVCAR-3 combination represents a powerful comparative model to help unravel dsRNA-mediated immune responses in ovarian cancer cells.

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Metadata
Title
Phytoglycogen-dsRNA nanoparticles demonstrate differential cytotoxicity and immunostimulatory potential in two ovarian cancer cell lines
Authors
A. Lewis
A. Tran
N. L. Aldor
N. A. Jadaa
T. Feng
E. Moore
S. J. DeWitte-Orr
S. J. Poynter
Publication date
01-06-2023
Publisher
Springer Netherlands
Published in
Journal of Nanoparticle Research / Issue 6/2023
Print ISSN: 1388-0764
Electronic ISSN: 1572-896X
DOI
https://doi.org/10.1007/s11051-023-05758-7

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