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ODN 1826 FITC

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ODN 1826 FITC

Class B - FITC-labeled ODN 1826

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50 µg

tlrl-1826f
+-
$150
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FITC labeled CpG oligonucleotide - Murine TLR9-preferred ligand

TLR9 activation with ODN 1826
TLR9 activation with ODN 1826

ODN 1826 FITC is the labeled version of ODN 1826, a Class B CpG oligonucleotide (ODN) with a preference for the mouse Toll-like receptor 9 (mTLR9). ODN 1826 is a short synthetic single-stranded DNA molecule containing unmethylated CpG dinucleotides (CpG motifs). It contains a full phosphorothioate backbone and is nuclease-resistant. These synthetic unmethylated CpG motifs mimic microbial DNA and act as immunostimulants via TLR9. 

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Mode of action

Stimulatory CpG ODNs are internalized and activate the endosomal receptor TLR9. Activation of TLR9 triggers NF-κB- and interferon regulatory factor (IRF)-mediated pro-inflammatory responses upon the recognition of unmethylated cytosine-phosphorothioate-guanosine (CpG) forms of DNA [1-3]. Unmethylated CpG dinucleotides are a hallmark of microbial (bacterial, viral, fungal, and parasite) DNA, as well as mitochondrial self-DNA [3, 4]. Class B (also called Type K) CpG ODNs, such as ODN 1826, contain a full phosphorothioate backbone with one or more CpG dinucleotides. They strongly activate B cells but weakly stimulate IFN-α secretion in plasmacytoid dendritic cells [5].

InvivoGen's ODN 1826 FITC is the labeled version of the ODN 1826, a strong mTLR9 agonist verified using our HEK-Blue™ reporter cell lines expressing human or mouse TLR9 (see figures here). 

ODN 1826 FITC can be used to evaluate CpG ODN binding, cellular uptake, and localization by confocal laser-scanning microscopy (excitation 495 nm, emission 520 nm) (data not shown) or flow cytometry (see figure). The labeled ODN retains the biological activity. 

 

Key features of ODN 1826 FITC

  • Potent activator of mouse TLR9
  • FITC labeled
  • Synthetic ODN with unmethylated CpG motifs
  • Each lot is functionally tested

 

Get more information about CpG ODNs Classes.

 

Read our review Read our review on TLR9 agonists: double-edged sword for immune therapies.

 

 

References

1. Kumagai Y. et al., 2008. TLR9 as a key receptor of the recognition of DNA. Adv. Drug. Deliv. Rev. 60(7):795-804.
2. Heinz L.X. et al., 2021. TASL is the SLC15A4-associated adaptor for IRF5 activation by TLR7-9. Nature. 581(7808):316-322.
3. Kayraklioglu N. et al., 2021. CpG oligonucleotides as vaccine adjuvants. DNA Vaccines: Methods and Protocols. Methods in Molecular Biology. Vol. 2197. p51-77.
4. Kumar V., 2021. The trinity of cGAS, TLR9, and ALRs: guardians of the cellular galaxy against host-derived self-DNA. Front. Immunol. 11:624597.
5. Krieg A.M. et al., 1995. CpG motifs in bacterial DNA trigger direct B-cell activation. Nature. 374(6522):546-9.

Figures

Detection of ODN 1826 FITC
Detection of ODN 1826 FITC

Detection of ODN 1826 FITC. RAW-Blue™ cells were left untreated or incubated with ODN 1826 (unlabeled) or ODN 1826 FITC. After 16h - 24h, the cells were analyzed using flow cytometry.

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Specifications

Specificity: murine TLR9 agonist

Working concentration: 1-5 μM

ODN 1826 sequence : 5’-tccatgacgttcctgacgtt-3’ (20 mer)
Note: Bases are phosphorothioate (nuclease resistant).

Spectral Properties of FITC:

  • Excitation λ max: 495 nm
  • Emission λ max: 520 nm

Quality control:

  • ODN 1826 FITC has been validated by flow cytometry and cellular assays.
  • The absence of bacterial contamination (e.g. lipoproteins and endotoxins) has been confirmed using HEK-Blue™ TLR2 and HEK-Blue™ TLR4 cell
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Contents

  • 50 μg (7.31 nmol) lyophilized ODN 1826 labeled with FITC at the 3’ terminus
  • 1 ml sterile endotoxin-free water

room temperature ODN 1826 FITC is shipped at room temperature.

store Store at -20°C. Resuspended product should be stored at -20°C and protected from light.

stable Product is stable for 6 months.

Alert Protect from light. Avoid repeated freeze-thaw cycles.

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Details

CpG ODNs

Synthetic oligodeoxynucleotides containing unmethylated CpG motifs (CpG ODNs), such as ODN 1018, have been extensively studied as adjuvants [1]. These CpG motifs are present at a 20-fold greater frequency in bacterial DNA compared to mammalian DNA [2]. CpG ODNs are recognized by the Toll-like receptor 9 (TLR9), which is expressed on human B cells and plasmacytoid dendritic cells (pDCs), thereby inducing Th1-dominated immune responses [3]. Pre-clinical studies, conducted in rodents and non-human primates, as well as human clinical trials, have demonstrated that CpG ODNs can significantly improve vaccine-specific antibody responses [1]. Three types of stimulatory CpG ODNs have been identified, types A, B, and C, which differ in their immune-stimulatory activities [4-5]. 

 

Toll-like receptor 9

The Toll-like Receptor 9 (TLR9) is an endosomal receptor that triggers NF-κB- and interferon regulatory factor (IRF)-mediated pro-inflammatory responses upon the recognition of unmethylated cytosine-phosphorothioate-guanosine (CpG) forms of DNA [6-8]. Unmethylated CpG dinucleotides are a hallmark of microbial (bacterial, viral, fungal, and parasite) DNA, as well as mitochondrial self-DNA [8,9]. These TLR9 agonists can be mimicked by synthetic oligonucleotides containing CpG motifs (CpG ODNs), which have been extensively studied to improve adaptive immune responses in the context of vaccination [6,8].

TLR9 is mainly expressed in subsets of Dendritic Cells and B cells of all mammals. In rodents, but not in humans, TLR9 is also expressed in monocytes and macrophages [8]. The structure of the receptor varies by 24% between human TLR9 (hTLR9) and mouse TLR9 (mTLR9) [8]. They recognize different CpG motifs, the optimal sequences being GTCGTT and GACGTT for hTLR9 and mTLR9, respectively [10].
 

 

References:

1. Steinhagen F. et al., 2011. TLR-based immune adjuvants. Vaccine 29(17):3341-55.
2. Hemmi H. et al., 2000. A Toll-like receptor recognizes bacterial DNA. Nature 408:740-5.
3. Coffman RL. et al., 2010. Vaccine adjuvants: Putting innate immunity to work. Immunity 33(4):492-503.
4. Krug A. et al., 2001. Identification of CpG oligonucleotide sequences with high induction of IFN-alpha/beta in plasmacytoid dendritic cells. Eur J Immunol, 31(7): 2154-63.
5. Marshall JD. et al., 2005. Superior activity of the type C class of ISS in vitro and in vivo across multiple species. DNA Cell Biol. 24(2):63-72.
6. Kumagai Y. et al., 2008. TLR9 as a key receptor of the recognition of DNA. Adv. Drug. Deliv. Rev. 60(7):795-804.
7. Heinz L.X. et al., 2021. TASL is the SLC15A4-associated adaptor for IRF5 activation by TLR7-9. Nature. 581(7808):316-322.
8. Kayraklioglu N. et al., 2021. CpG oligonucleotides as vaccine adjuvants. DNA Vaccines: Methods and Protocols. Methods in Molecular Biology. Vol. 2197. p51-77.
9. Kumar V., 2021. The trinity of cGAS, TLR9, and ALRs: guardians of the cellular galaxy against host-derived self-DNA. Front. Immunol. 11:624597.
10. Bauer S. et al., 2001. Human TLR9 confers responsiveness to bacterial DNA via species-specific CpG motif recognition. Proc Natl Acad Sci USA, 98(16):9237-42.

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