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Arthritis develops but fails to resolve during inhibition of cyclooxygenase 2 [COX-2] in a murine model of Lyme disease – Source: Arthritis and Rheumatism, Apr 25, 2008

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By Victoria A Blaho, et al. • www.ProHealth.com • May 1, 2008


[Note: COX-2 is an enzyme responsible for inflammation and pain. COX-2 inhibitor products include non-steroidal anti-inflammatory drugs (NSAIDs) such as aspirin or ibuprofen. This study suggests COX-2 inhibitors may also inhibit pro-resolution eicosanoids.]

Objective: Recent studies have implicated products of cyclooxygenase 2 (COX-2) in not only induction but also resolution of the inflammatory response; however, the contribution of COX-2 products to the in vivo response to infection is unknown. The aim of this study was to determine the contribution of COX-2 to temporal regulation of the inflammatory response to infection in a murine model of Lyme arthritis.

Methods: Experimental Lyme disease was induced in both arthritis-resistant DBA/2J and arthritis-susceptible C3H/HeJ mice by inoculation in the hind footpads with Borrelia burgdorferi. COX-2 inhibitors were administered daily, and their effect on arthritis pathology was assessed at various time points post-infection.

The COX-2 deficiency was also backcrossed onto both DBA and C3H backgrounds to confirm the findings from COX-2 inhibitor-treated mice.

Results:

  • In COX-2 inhibitor-treated or COX-2(-/-) C3H mice, arthritis developed normally but did not resolve.
  • Cessation of COX-2 inhibitor treatment on day 14 post-infection did not induce resolution of arthritis, indicating an early onset for the molecular mechanisms governing resolution.
  • The lack of resolution of arthritis correlated with altered COX-2 and cytosolic phospholipase A(2) messenger RNA levels in the joints of C3H mice. In addition, the proresolution lipid molecule 15-deoxy-Delta(12,14)-prostaglandin J(2) was produced in response to B burgdorferi infection, and its production was attenuated by the inhibition of COX-2.

Conclusion: Our results demonstrate:

  • That early production of COX-2 products is necessary for resolution of the inflammatory arthritis induced by Borrelia infection,
  • And that COX-2 inhibition may result in prolonged inflammatory states, possibly by inhibition of pro-resolution eicosanoids [‘signaling molecules’ made by oxygenation of the omega-3 essential fatty acid EPA (found in fish oil), and influencing inflammation/immunity].

Source: Arthritis and Rheumatism, April 2008;58(5):1485-1495. PMID: 18438879 [E-publication ahead of print] by Blaho VA, Jefferson Mitchell W, Brown CR. University of Missouri, Columbia, Missouri, USA.





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