PMID- 32663289 OWN - NLM STAT- MEDLINE DCOM- 20210107 LR - 20210107 IS - 1552-5783 (Electronic) IS - 0146-0404 (Print) IS - 0146-0404 (Linking) VI - 61 IP - 8 DP - 2020 Jul 1 TI - Retinoic Acid Potentiates Orbital Tissues for Inflammation Through NF-kappaB and MCP-1. PG - 17 LID - 10.1167/iovs.61.8.17 [doi] LID - 17 AB - PURPOSE: The orbit displays unique vulnerability to inflammatory conditions. The most prevalent of these conditions, thyroid eye disease (TED), occurs in up to 50% of patients with Graves' disease (GD). Whereas the pathology of both TED and GD is driven by autoantibodies, it is unclear why symptoms manifest specifically in the orbit. METHODS: We performed retinoic acid treatment on both normal and TED patient-derived orbital fibroblasts (OFs) followed by mRNA and protein isolation, quantitative real-time polymerase chain reaction (qRT-PCR), enzyme-linked immunosorbent assay, RNA sequencing, and Western blot analyses. RESULTS: Both normal and TED patient-derived OFs display robust induction of monocyte chemoattractant protein 1 (MCP-1) upon retinoid treatment; TED OFs secrete significantly more MCP-1 than normal OFs. In addition, pretreatment of OFs with thiophenecarboxamide (TPCA-1) inhibits retinoid-induced MCP-1 induction, suggesting an NF-kappaB (nuclear factor kappa-light-chain-enhancer of activated B cells)-dependent mechanism. We also found that treatment with cholecalciferol (vitamin D3) mitigates MCP-1 induction, likely because of competition between retinoic acid receptors (RARs) and vitamin D receptors (VDR) for their common binding partner retinoid nuclear receptors (RXRs). CONCLUSIONS: Retinoids that naturally accumulate in orbital adipose tissue can act on orbital fibroblasts to induce the expression of inflammation-associated genes. These data suggest a potential role for retinoids in sensitizing the orbit to inflammation. FAU - Unsworth, Shelby P AU - Unsworth SP AD - ,. FAU - Heisel, Curtis J AU - Heisel CJ AD - ,. FAU - Tingle, Christina F AU - Tingle CF AD - ,. FAU - Rajesh, Niharika AU - Rajesh N AD - ,. FAU - Kish, Phillip E AU - Kish PE AD - ,. FAU - Kahana, Alon AU - Kahana A AD - ,. AD - ,. LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't PL - United States TA - Invest Ophthalmol Vis Sci JT - Investigative ophthalmology & visual science JID - 7703701 RN - 0 (CCL2 protein, human) RN - 0 (Chemokine CCL2) RN - 0 (NF-kappa B) RN - 0 (RNA, Messenger) RN - 5688UTC01R (Tretinoin) SB - IM MH - Blotting, Western MH - Cells, Cultured MH - Chemokine CCL2/biosynthesis/*genetics MH - Fibroblasts/metabolism/pathology MH - Gene Expression Regulation/*drug effects MH - Humans MH - Inflammation/*genetics/metabolism/pathology MH - NF-kappa B/biosynthesis/*genetics MH - Orbit/metabolism/pathology MH - RNA, Messenger/*genetics MH - Signal Transduction MH - Tretinoin/*pharmacology PMC - PMC7425727 COIS- Disclosure: S.P. Unsworth, None; C.J. Heisel, None; C.F. Tingle, None; N. Rajesh, None; P.E. Kish, None; A. Kahana, None EDAT- 2020/07/15 06:00 MHDA- 2021/01/08 06:00 PMCR- 2020/07/14 CRDT- 2020/07/15 06:00 PHST- 2020/07/15 06:00 [entrez] PHST- 2020/07/15 06:00 [pubmed] PHST- 2021/01/08 06:00 [medline] PHST- 2020/07/14 00:00 [pmc-release] AID - 2770311 [pii] AID - IOVS-20-29843 [pii] AID - 10.1167/iovs.61.8.17 [doi] PST - ppublish SO - Invest Ophthalmol Vis Sci. 2020 Jul 1;61(8):17. doi: 10.1167/iovs.61.8.17.