ACR Meeting Abstracts

ACR Meeting Abstracts

  • Meetings
    • ACR Convergence 2024
    • ACR Convergence 2023
    • 2023 ACR/ARP PRSYM
    • ACR Convergence 2022
    • ACR Convergence 2021
    • ACR Convergence 2020
    • 2020 ACR/ARP PRSYM
    • 2019 ACR/ARP Annual Meeting
    • 2018-2009 Meetings
    • Download Abstracts
  • Keyword Index
  • Advanced Search
  • Your Favorites
    • Favorites
    • Login
    • View and print all favorites
    • Clear all your favorites
  • ACR Meetings

Abstract Number: 2784

Contribution at the Spinal Level of Innate and Adaptive Immunity to the Development of Persistent Post-Inflammatory Mechanical Allodynia in Arthritic Mice

Sarah Woller1, Cody Ocheltree2, Tony Yaksh1 and Marpiat Corr3, 1Anesthesiology, UCSD, La Jolla, CA, 2Division of Rheumatology, Allergy, and Immunology, UCSD, La Jolla, CA, 3University of California at San Diego, La Jolla, CA

Meeting: 2014 ACR/ARHP Annual Meeting

Keywords: adaptive immunity, innate immunity, pain and toll-like receptors

  • Tweet
  • Click to email a link to a friend (Opens in new window) Email
  • Click to print (Opens in new window) Print
Session Information

Title: ACR Plenary Session III: Discovery 2014

Session Type: Plenary Sessions

Background/Purpose

Individuals with arthritis frequently develop persistent pain despite adequate treatment of synovitis. There is a need to better understand the mechanisms underlying pain occurring with arthritis. Recently, it has been shown that Toll-like receptor 4 (TLR4) mediates the transition from acute to chronic pain in a murine model of arthritis. Rather than developing persistent pain, animals deficient in TLR4 showed an attenuation of the late phase of pain. This receptor is unique in signaling through both MyD88-dependent and independent pathways. In order to further understand the role of TLR signaling, we examined the development of arthritis and persistent pain in mice deficient in these adaptor proteins.

Methods

Adult arthritic K/BxN mice were bled and the sera pooled. 100μl of the pooled sera was injected into recipient mice on Days 0 and 2. Clinical arthritis scores and mechanical reactivity, using the up-down method of von Frey testing, were assessed over a period of 28 days in male C57Bl/6, Tlr4-/-, Triflps2, Myd88-/-, Tnf-/–, and Ifnar1-/- mice. Spinal cords were collected from WT and Tlr4-/- arthritic mice and changes in gene expression were measured using nanoString™ nCounter™ analysis. Behavioral data were analyzed using repeated measures ANOVAs, and Duncan New Multiple Range post–hoc analyses when appropriate.

Results

As shown previously, WT mice develop a persistent increase in mechanical reactivity that outlasts the period of inflammation; the 50% withdrawal thresholds dropped from 1.66 at baseline to 0.74 on day 28.  In addition, Tlr4-/- mice develop an initial increase in reactivity, which resolves concurrent with inflammation (WT AUC 13.2 and TLR4 AUC 9.7, p<.05). MyD88 and TRIF play distinct roles in the development of pain: mice lacking MyD88 do not develop swelling or allodynia (AUC 2.6, p<0.01), while those deficient in TRIF develop a prolonged allodynia (AUC 12.2), similar to WT animals and outlasting the period of inflammation. NanoString™ nCounter™ analysis of 516 immune genes in the spinal cords of WT and Tlr4-/- mice harvested on Day 10 of arthritis showed differences in expression levels of IL2, RANKL, IFNβ, and TNF transcripts. Therefore, we also examined the development of pain resulting from arthritis in Rag1-/-, Ifnar1-/-, and Tnf-/– mice. In the Tnf-/– mice there was an attenuated development of pain (AUC 8.0, p<.001), the Rag1 (10.0, p<.05) mice developed pain, which resolved with the resolution of inflammation similar to Tlr4-/- mice and Ifnar1-/- mice developed pain that was not different than the WT mice (AUC 12.2).

Conclusion

These results suggest that pain can persist after resolution of inflammation. The innate and adaptive immune systems appear to have distinct roles in the development of the chronic pain state, and this pain cannot be attributed solely to increased TNF or IFNβ transcription.


Disclosure:

S. Woller,
None;

C. Ocheltree,
None;

T. Yaksh,
None;

M. Corr,
None.

  • Tweet
  • Click to email a link to a friend (Opens in new window) Email
  • Click to print (Opens in new window) Print

« Back to 2014 ACR/ARHP Annual Meeting

ACR Meeting Abstracts - https://acrabstracts.org/abstract/contribution-at-the-spinal-level-of-innate-and-adaptive-immunity-to-the-development-of-persistent-post-inflammatory-mechanical-allodynia-in-arthritic-mice/

Advanced Search

Your Favorites

You can save and print a list of your favorite abstracts during your browser session by clicking the “Favorite” button at the bottom of any abstract. View your favorites »

All abstracts accepted to ACR Convergence are under media embargo once the ACR has notified presenters of their abstract’s acceptance. They may be presented at other meetings or published as manuscripts after this time but should not be discussed in non-scholarly venues or outlets. The following embargo policies are strictly enforced by the ACR.

Accepted abstracts are made available to the public online in advance of the meeting and are published in a special online supplement of our scientific journal, Arthritis & Rheumatology. Information contained in those abstracts may not be released until the abstracts appear online. In an exception to the media embargo, academic institutions, private organizations, and companies with products whose value may be influenced by information contained in an abstract may issue a press release to coincide with the availability of an ACR abstract on the ACR website. However, the ACR continues to require that information that goes beyond that contained in the abstract (e.g., discussion of the abstract done as part of editorial news coverage) is under media embargo until 10:00 AM ET on November 14, 2024. Journalists with access to embargoed information cannot release articles or editorial news coverage before this time. Editorial news coverage is considered original articles/videos developed by employed journalists to report facts, commentary, and subject matter expert quotes in a narrative form using a variety of sources (e.g., research, announcements, press releases, events, etc.).

Violation of this policy may result in the abstract being withdrawn from the meeting and other measures deemed appropriate. Authors are responsible for notifying colleagues, institutions, communications firms, and all other stakeholders related to the development or promotion of the abstract about this policy. If you have questions about the ACR abstract embargo policy, please contact ACR abstracts staff at [email protected].

Wiley

  • Online Journal
  • Privacy Policy
  • Permissions Policies
  • Cookie Preferences

© Copyright 2025 American College of Rheumatology