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[Human corneal epithelial, stromal and endothelial cells produce interleukin-6]
1Department of Bacteriology, School of Medicine, Iwate Medical University, Morioka, Japan.
Insights
Human corneal cells produce interleukin-6 (IL-6), a key cytokine. Stromal and endothelial cells show induced IL-6 production in response to inflammatory stimuli like lipopolysaccharide (LPS) and IL-1 alpha.
Area of Science:
- Ophthalmology
- Immunology
- Cell Biology
Context:
- Cytokines play crucial roles in ocular tissue function and disease.
- Understanding cytokine production in the cornea is vital for diagnosing and treating inflammatory eye conditions.
Purpose:
- To investigate the in vitro production of interleukin-6 (IL-6) by human corneal epithelial, stromal, and endothelial cells.
- To characterize the induction and kinetics of IL-6 production in response to inflammatory stimuli.
Summary:
- Enzyme-linked immunosorbent assay (ELISA) demonstrated IL-6 production by human corneal cells.
- Stromal cells showed dose-dependent IL-6 induction by lipopolysaccharide (LPS) or IL-1 alpha, with peak activity at 48 hours post-IL-1 alpha.
- Endothelial cells produced IL-6 constitutively and upon LPS stimulation.
- Gel filtration and Western blotting confirmed the molecular weight of corneal IL-6 to be approximately 30 kDa.
Impact:
- This study elucidates the capacity of corneal cells to produce IL-6, a significant inflammatory cytokine.
- Findings contribute to understanding the corneal inflammatory response and may inform therapeutic strategies for ocular diseases.
Abstract:
We have been investigating the production of cytokines in ocular tissues. In this paper, we demonstrated the in vitro production of interleukin-6 (IL-6) by human corneal epithelial, stromal and endothelial cells using enzyme-linked immunosorbent assay (ELISA). In culture supernatant of the stromal cells, the production of immunoreactive IL-6 was induced, depending upon the doses of lipopolysaccharide (LPS) or IL-1 alpha added into the culture. Detectable IL-6 activity in the supernatant of the stromal cells was found 2 hours after addition of IL-1 alpha and the activity increased to a peak level at 48 hours. On the other hand, in the supernatant of the endothelial cells, IL-6 activity was found even in unstimulated-culture, and induced further by LPS stimulation. The molecular weights (MWs) of the IL-6 produced by the epithelial, stromal and endothelial cells were calculated by gel filtration as about 30 kDa. From Western blotting analysis, the MW of IL-6 produced by the stromal cells was also determined to be 30 kDa.