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Related Experiment Videos

Extended sequence preferences for oligodeoxyribonucleotide activity.

Petar Lenert1, Adam J Goeken, Robert F Ashman

  • 1Division of Rheumatology, Department of Internal Medicine, Carver College of Medicine, The University of Iowa, Iowa City, IA 52242, USA. petar-lenert@uiowa.edu

Immunology
|March 25, 2006
PubMed
Summary
This summary is machine-generated.

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Synthetic oligodeoxyribonucleotides (ODN) activate immune cells through Toll-like receptor 9 (TLR9). Specific sequence features determine whether ODN stimulate or inhibit B cell responses, providing insights into TLR9 activation mechanisms.

Area of Science:

  • Immunology
  • Molecular Biology
  • Medicinal Chemistry

Background:

  • Synthetic phosphorothioate oligodeoxyribonucleotides (ODN) are known to activate mouse B cells.
  • This activation is mediated through Toll-like receptor 9 (TLR9).

Purpose of the Study:

  • To delineate the specific sequence requirements for stimulatory (ST-) and inhibitory (IN-) ODN activity.
  • To develop a model for Toll-like receptor 9 (TLR9) aggregation and signaling initiation by ODN.

Main Methods:

  • Comparative analysis of 15-mer prototype ODN with varying sequences.
  • Assays measuring apoptosis protection, G(1) cell cycle entry, and interleukin-6 secretion in mouse B cells.
  • NF-kappaB activation assays in HEK293 cells transfected with TLR9.

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Main Results:

  • Stimulatory ODN require a 5' T, an obligatory central CG, and flanking 3' TT, unlike inhibitory ODN.
  • Inhibitory ODN tolerate 3' end truncation better than stimulatory ODN.
  • Both types of ODN share requirements for adjacent 5' CC and avoidance of 5' CC near the central CG.
  • ODN potency in HEK293 cells transfected with TLR9 paralleled biological activity in mouse B cells.

Conclusions:

  • Specific sequence motifs dictate whether ODN are stimulatory or inhibitory via TLR9.
  • A model for TLR9 activation involving ODN-mediated aggregation is proposed.
  • TLR9 is confirmed as the primary receptor for ODN-induced immune cell activation.