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Murine Dermal Fibroblast Isolation by FACS
Published on: January 7, 2016
Orbital fibroblast interleukin-6 gene expression and immunomodulation
M A Burnstine1, S G Elner, R M Strieter
1Department of Ophthalmology (W. K. Kellogg Eye Center), University of Michigan Medical School, Ann Arbor, USA.
Ophthalmic Plastic and Reconstructive Surgery
|October 8, 1999
Summary
Orbital fibroblasts (OFs) express interleukin-6 (IL-6) when exposed to inflammatory signals. Dexamethasone (DEX) inhibits this IL-6 production, while cyclosporin A (CSA) increases it, offering insights into orbital disease treatment.
Area of Science:
- Ophthalmology
- Immunology
- Molecular Biology
Background:
- Orbital inflammation mechanisms, particularly leukocytic infiltration, are not fully understood.
- Human orbital fibroblasts (OFs) play a role in orbital inflammation.
Purpose of the Study:
- To investigate human orbital fibroblast (OF) interleukin-6 (IL-6) gene expression in response to proinflammatory stimuli.
- To determine the effects of dexamethasone (DEX) and cyclosporin A (CSA) on cytokine-stimulated OF IL-6 gene expression.
Main Methods:
- Cultured OFs were stimulated with lipopolysaccharide (LPS) or recombinant cytokines (IL-1beta, TNF-alpha, IFN-gamma).
- OF IL-6 mRNA expression was analyzed using Northern blot after stimulation with varying concentrations and durations.
- The impact of DEX and CSA on IL-1beta-induced IL-6 expression was assessed.
Main Results:
- OFs showed no constitutive IL-6 gene expression.
- Proinflammatory stimuli induced significant, time- and dose-dependent increases in OF IL-6 mRNA expression.
- DEX demonstrated dose-dependent inhibition of IL-1beta-induced IL-6 mRNA, whereas CSA potentiated it.
Conclusions:
- OFs are capable of expressing IL-6 mRNA in response to inflammatory triggers.
- DEX effectively inhibits OF IL-6 mRNA expression, while CSA enhances IL-1beta-induced IL-6 expression.
- These findings may explain the limited efficacy of CSA in corticosteroid-responsive human orbital diseases.
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