ssPolyU Naked

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ssPolyU Naked

TLR8 Agonist - RNA homopolymer

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10 mg


TLR7 and/or TLR8 activation with ssRNA
TLR7 and/or TLR8 activation with ssRNA

TLR8 Agonist - RNA homopolymer - non-complexed

Poly(U) is a lyophilized preparation of a synthetic single-stranded poly-uridine (ssPolyU), able to activate the Toll-like receptors TLR7 and/or TLR8. 

Single-stranded RNA (ssRNA) has been identified as the natural ligand of TLR7 and TLR8 [1]. ssRNA derived from HIV-1 or the influenza virus were shown to induce the production of proinflammatory cytokines in pDC [2,3]. This induction was reproduced using polyU or GU-rich oligoribonucleotides (ORNs).



InvivoGen's ssPolyU Naked is not complexed and therefore, not protected from degradation. Still, ssPolyU Naked is a specific agonist of human TLR8 as verified by using our HEK-Blue™ reporter cell lines (see figure). Moreover, it activates mouse TLR7 [data not shown].

InvivoGen also offers a complexed version ssPolyU/LyoVec™

Key features of ssPolyU Naked

  • Specific activator of human TLR8 
  • No activation of human TLR7
  • Complexed ssPolyU/LyoVec™ is available
  • Non-complexed
  • Each lot of ssPolyU Naked is functionally tested


More infoRead our review about TLR7 and TLR8.



1. Heil F. et al., 2004. Species-specific recognition of single-stranded RNA via toll-like receptor 7 and 8. Science. 5;303(5663):1526-9.
2. Alter G. et al., 2007. Single-Stranded RNA Derived from HIV-1 Serves as a Potent Activator of NK Cells. J Immunol. 178:7658-7666.
3. Hornung V. et al., 2005. Sequence-specific potent induction of IFN-alpha by short interfering RNA in plasmacytoid dendritic cells through TLR7.Nat Med. 11(3):263-70.


NF-κB response of HEK-Blue™-derived cells to ssPolyU Naked
NF-κB response of HEK-Blue™-derived cells to ssPolyU Naked

NF-κB response of HEK-Blue™-derived cells to ssPolyU Naked. HEK-Blue™ cells expressing hTLR7 or hTLR8 were stimulated with increasing concentrations of ssPolyU Naked. After 24h incubation, the NF-κB-induced SEAP activity was assessed using QUANTI-Blue™. Data are shown as optical density (OD) at 650 nm (mean ± SEM). Of note, HEK-Blue™ Null* comprises data from parental cell lines HEK-Blue Null1 and HEK-Blue Null1-v.

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Specificity: human TLR8/mouse TLR7 agonist

Working Concentration: 1 - 10 μg/ml

CAS number: 28086-43-3

Solubility: 1 mg/ml in water

Quality control:

  • The biological activity of ssPolyU Naked has been validated using cellular assays.
  • The absence of bacterial contamination (e.g. lipoproteins and endotoxins) has been confirmed using HEK-Blue™ hTLR2 and HEK-Blue™ hTLR4 cells.
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  • 10 mg of lyophilized Poly(U)
  • 10 ml of endotoxin-free water

room temperature Poly(U) is shipped at room temperature.

store Store lyophilized Poly(U) at -20 °C.

stability Lyophilized product is stable 1 year when stored -20 ̊C.

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