Hyaluronic acid induces COX-2 Expression via CD44 in orbital fibroblasts from patients with thyroid-associated ophthalmopathy

Hun Sub Lim, Keum Ok Back, Hee Ja Kim, Youn Hee Choi, Young Mi Park, Koung Hoon Kook

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

Purpose: The aim of this study was to determine the effect of hyaluronic acid (HA) on cyclooxygenase (COX)-2 expression in orbital fibroblasts from patients with thyroidassociated ophthalmopathy (TAO).

Methods: Primary cultured orbital fibroblasts were obtained from patients with TAO and non- TAO subjects. Dermal and conjunctival fibroblasts were cultured from the eyelid skin of subjects undergoing cosmetic lid surgery or cataract surgery, respectively. The cells were treated with HA and the transcriptional and translational levels of COX-2 were measured. The expression of CD44 on each type of cells was determined, and the involvement of CD44 in the HA-induced COX-2 increase in orbital fibroblasts from patients with TAO was evaluated by using CD44 knockdown cells and by pretreatment with neutralizing antibody. The relevance of the mitogen-activated protein kinase (MAPK) or nuclear factor kappa-light-chain-enhancer of activated B cells (NF-jB)-mediated signaling pathway was assessed by immunoblotting for the phosphorylated form of each MAPK or IκB and by using specific inhibitors to these pathways.

Results: Hyaluronic acid increased COX-2 expression in orbital fibroblasts from patients with TAO, which was not observed in the cells from non-TAO subjects and conjunctival or dermal fibroblasts. Orbital fibroblasts from patients with TAO expressed significantly higher level of CD44 than non-TAO cells, and the increased COX-2 expression by HA in these cells was attenuated by knockdown or neutralizing of CD44. Hyaluronic acid induced MAPK and IκB phosphorylation; and cotreatment with specific MAPK or NF-κB inhibitors halted HA-induced transcription of COX-2, suggesting the involvement of these signaling pathways.

Conclusions: Hyaluronic acid induced COX-2 expression in orbital fibroblasts from patients with TAO via CD44 through the MAPK and NF-κB-mediated signaling pathways. These results suggest that HA may have a proinflammatory role in the pathogenesis of TAO by inducing COX-2.

Original languageEnglish
Pages (from-to)7441-7450
Number of pages10
JournalInvestigative Ophthalmology and Visual Science
Volume55
Issue number11
DOIs
StatePublished - 23 Oct 2014

Bibliographical note

Publisher Copyright:
© 2014 The Association for Research in Vision and Ophthalmology, Inc.

Keywords

  • CD44
  • COX-2
  • Hyaluronic acid
  • Orbital fibroblast
  • Thyroid-associated ophthalmopathy

Fingerprint

Dive into the research topics of 'Hyaluronic acid induces COX-2 Expression via CD44 in orbital fibroblasts from patients with thyroid-associated ophthalmopathy'. Together they form a unique fingerprint.

Cite this