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IFN-alpha induces MxA gene expression in cultured human corneal fibroblasts
M E Abrams1, M J Balish, C R Brandt
1Department of Ophthalmology and Visual Sciences, University of Wisconsin Medical School, Madison 53706-1532, USA.
Abstract:
Treatment of certain human cells with Interferon-alpha (IFN-alpha) induces the synthesis of a 76 kDa protein designated MxA that is involved in resistance to viral infection. We have used a specific cDNA clone and monoclonal Ab to show that MxA is induced in IFN-alpha treated human corneal fibroblast cultures. Mx RNA was increased 23-fold and 45-fold after 5 and 9 h of IFN-alpha treatment, respectively. The MxA protein was detectable by immunoblotting at 5 hr after IFN treatment and peaked at 17 hr. Concentrations of IFN-alpha as low as 1 U/ml induced detectable amounts of MxA, and expression was maximal at 1 x 10(3) U ml-1. These results confirm that MxA synthesis is induced in human corneal fibroblasts treated with IFN-alpha.
Insights
Interferon-alpha (IFN-alpha) treatment induces MxA protein synthesis in human corneal fibroblasts, enhancing resistance to viral infection. This antiviral protein
Area of Science:
- Molecular biology
- Immunology
- Virology
Background:
- Interferon-alpha (IFN-alpha) is a key cytokine in antiviral defense.
- The MxA protein is known to confer resistance to viral infections.
- Investigating MxA induction in specific human cell types is crucial for understanding antiviral mechanisms.
Purpose of the Study:
- To investigate the induction of MxA protein synthesis in human corneal fibroblasts upon IFN-alpha treatment.
- To quantify the changes in MxA RNA and protein levels in response to IFN-alpha.
Main Methods:
- Treatment of human corneal fibroblasts with varying concentrations of IFN-alpha.
- Quantitative analysis of MxA RNA levels using cDNA clones.
- Detection and quantification of MxA protein using immunoblotting techniques.
Main Results:
- IFN-alpha treatment significantly increased MxA RNA levels (23-fold at 5h, 45-fold at 9h).
- MxA protein became detectable by 5h and peaked at 17h post-treatment.
- Detectable MxA induction occurred at low IFN-alpha concentrations (1 U/ml), with maximal expression at 1 x 10(3) U/ml.
Conclusions:
- IFN-alpha effectively induces MxA synthesis in human corneal fibroblasts.
- The MxA protein plays a role in the antiviral response of corneal cells.
- These findings contribute to understanding cellular defense mechanisms against viral pathogens.