
How to test for immune activation by your therapeutic oligonucleotide
Presenter: Arthur M. Krieg, MD, Checkmate Pharmaceuticals
Date: 19 April 2018
Description:
RNA and DNA oligonucleotides with charged backbones commonly cause immune activation, which can be recognized by appropriate in vitro and/or in vivo testing.
Eukaryotic innate immune systems have evolved multiple receptors to detect foreign or self nucleic acids as signs of infection or tissue damage. Receptors to detect both RNA and DNA are present in both the endosomes and cytoplasm of many cells, and are commonly activated by therapeutic oligonucleotides. Recognition of these effects is critical to appropriate interpretation of experimental data. Various strategies involving sequence selection and nucleotide/backbone modification can be used to reduce undesired immune stimmulatory effects.
In this webinar Art will share his expertise in how to best detect innate immune system activation and distinguish between effect of such activation and your therapeutic oligonucleotide. The presentation will be followed by a Q&A session where you can ask Art your questions during the broadcast.
Recording of the Webinar: Click Play to View
In addition, Dr. Krieg would like to make the slides available for download. Art’s OTS webinar final
These are Dr. Krieg’s responses to questions that came up during the Q&A session but which he was unable to answer due to time constraints.
In immunocompromised mice, if the therapeutic activity of the RNAi already leads to lineage switch or/and differentiation of the targeted human haematopoietic cells (in leukaemia context). How to distinguish between the immuno activation by the siRNA from one side, and by the interaction between the mouse cells and the new treated leukaemic cells?
Indeed, this can be hard! My suggestion is to use a control siRNA that is not able to mediate siRNA, such as a mismatch sequence that can not cleave the target.
Because NHPs can be costly early on, are there any small animal models that could be used for testing in vivo TLR8 activity?
I am not aware of any, but you could use humanized mice (with human hematopoietic cells – still pretty expensive!)
What about the repetitive or accumulative effect? In most of the therapies a delivery of the molecule needs to be repeated weekly or monthly, so could it be that those chemistries that do not seem to trigger any immune reaction (apparently) will end up producing a reaction? Is there anything known?
Oligos accumulate in the kidney and liver with repeated dosing and so yes, you are quite correct that repeated dosing is more likely to cause problems in those organs than single dosing. Also, with repeated SC injection over time there is more risk of chronic changes in the injection site. In general however if there are no obvious immune effects like fever with the first few doses, then you are not likely to see these as dosing continues. This is probably because the cytokine induction from oligo injection does not increase over time – the responding immune cells do not seem to accumulate oligo.
Do you think immune response against delivery agents that are packed with DNA/RNA be different from unpackaged delivery agents? If so what is the best way to check for this?
Yes, it definitely is true that the DNA/RNA cargo makes a huge difference in the response to the delivery agent. To test for this I like to use an inactive control, such as a fully 2’OMe oligo that generally has little or no immune effect compared to a positive control, such as an unmodified RNA with TLR7/8 activating sequences.
Presenter Biography

Arthur M. Krieg, MD,
Checkmate Pharmaceuticals
Art graduated from Haverford College in 1979, received his MD from Washington University in 1983, and completed a residency in Internal Medicine at the University of Minnesota in 1986. He was a Staff Fellow at the NIH in the Arthritis Institute from 1986 to 1991, when he joined the University of Iowa, becoming Professor of Internal Medicine in the Division of Rheumatology. He has had 19 years of patient care experience, although his focus has always been on basic research and teaching. Art left academia and joined Coley full-time in 2001. He has published more than 250 scientific papers and is an inventor on 48 issued US patents covering oligonucleotide technologies.
References
- Sequence motifs associated with hepatotoxicity of locked nucleic acid–modified antisense oligonucleotides.
Burdick AD, Sciabola S, Mantena SR, Hollingshead BD, Stanton R, Warneke JA, Zeng M, Martsen E, Medvedev A, Makarov SS, Reed LA, Davis JW 2nd, Whiteley LO.
Nucleic Acids Res. 2014 Apr;42(8):4882-91. - Hepatotoxicity of high affinity gapmer antisense oligonucleotides is mediated by RNase H1 dependent promiscuous reduction of very long pre-mRNA transcripts.
Burel SA, Hart CE, Cauntay P, Hsiao J, Machemer T, Katz M, Watt A, Bui HH, Younis H, Sabripour M, Freier SM, Hung G, Dan A, Prakash TP, Seth PP, Swayze EE, Bennett CF, Crooke ST, Henry SP.
Nucleic Acids Res. 2016 Mar 18;44(5):2093-109. - Identification of RNA sequence motifs stimulating sequence-specific TLR8-dependent immune responses.
Forsbach A, Nemorin JG, Montino C, Müller C, Samulowitz U, Vicari AP, Jurk M, Mutwiri GK, Krieg AM, Lipford GB, Vollmer J.
J Immunol. 2008 Mar 15;180(6):3729-38. - The DNA Inflammasome in Human Myeloid Cells Is Initiated by a STING-Cell Death Program Upstream of NLRP3.
Gaidt MM, Ebert TS, Chauhan D, Ramshorn K, Pinci F, Zuber S, O’Duill F, Schmid-Burgk JL, Hoss F, Buhmann R, Wittmann G, Latz E, Subklewe M, Hornung V.
Cell. 2017 Nov 16;171(5):1110-1124.e18. - Nucleic Acid Immunity.
Hartmann G.
Adv Immunol. 2017;133:121-169. - Selection of GalNAc-conjugated siRNAs with limited off-target-driven rat hepatotoxicity.
Janas MM, Schlegel MK, Harbison CE, Yilmaz VO, Jiang Y, Parmar R, Zlatev I, Castoreno A, Xu H, Shulga-Morskaya S, Rajeev KG, Manoharan M, Keirstead ND, Maier MA, Jadhav V.
Nat Commun. 2018 Feb 19;9(1):723. - A minimal RNA ligand for potent RIG-I activation in living mice.
Linehan MM, Dickey TH, Molinari ES, Fitzgerald ME, Potapova O, Iwasaki A, Pyle AM.
Sci Adv. 2018 Feb 21;4(2):e1701854. - 2′-O-methyl-modified RNAs act as TLR7 antagonists.
Robbins M, Judge A, Liang L, McClintock K, Yaworski E, MacLachlan I.
Mol Ther. 2007 Sep;15(9):1663-9. - Discriminating self from non-self in nucleic acid sensing.
Schlee M, Hartmann G.
Nat Rev Immunol. 2016 Sep;16(9):566-80. - 5′-triphosphate RNA requires base-paired structures to activate antiviral signaling via RIG-I.
Schmidt A, Schwerd T, Hamm W, Hellmuth JC, Cui S, Wenzel M, Hoffmann FS, Michallet MC, Besch R, Hopfner KP, Endres S, Rothenfusser S.
Proc Natl Acad Sci U S A. 2009 Jul 21;106(29):12067-72. - Sequences derived from self-RNA containing certain natural modifications act as suppressors of RNA-mediated inflammatory immune responses.
Tluk S, Jurk M, Forsbach A, Weeratna R, Samulowitz U, Krieg AM, Bauer S, Vollmer J.
Int Immunol. 2009 May;21(5):607-19. - Highly immunostimulatory CpG-free oligodeoxynucleotides for activation of human leukocytes.
Vollmer J, Janosch A, Laucht M, Ballas ZK, Schetter C, Krieg AM.
Antisense Nucleic Acid Drug Dev. 2002 Jun;12(3):165-75. - Oligodeoxynucleotides lacking CpG dinucleotides mediate Toll-like receptor 9 dependent T helper type 2 biased immune stimulation.
Vollmer J, Weeratna RD, Jurk M, Samulowitz U, McCluskie MJ, Payette P, Davis HL, Schetter C, Krieg AM.
Immunology. 2004 Oct;113(2):212-23.