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Interferon consensus sequence-binding protein is constitutively expressed and differentially regulated in the ocular
W Li1, C N Nagineni, H Ge
1Laboratory of Immunology, National Institutes of Health, Bethesda, Maryland 20892, USA.
The Journal of Biological Chemistry
|March 27, 1999
Summary
Interferon consensus sequence-binding protein (ICSBP) is found in the mouse lens, challenging its lymphoid-specific designation. Its expression and localization in the lens suggest novel, non-immune functions.
Area of Science:
- Molecular Biology
- Immunology
- Ophthalmology
Background:
- Interferon signaling involves transcription factors like STATs and interferon regulatory factors (IRFs).
- Interferon consensus sequence-binding protein (ICSBP) was previously thought to be exclusively expressed in lymphoid cells.
Purpose of the Study:
- To investigate the expression and function of ICSBP in the mouse ocular lens.
- To determine if ICSBP has roles beyond immune responses.
Main Methods:
- Investigated ICSBP expression in mouse lens cells using molecular biology techniques.
- Analyzed ICSBP subcellular localization and promoter activity.
- Examined the role of STAT1 in ICSBP gene activation.
Main Results:
- ICSBP is constitutively and inducibly expressed in the mouse lens.
- ICSBP is found in both the cytoplasm and nucleus of lens cells, with nuclear ICSBP having lower molecular weight.
- ICSBP promoter activation requires lens nuclear factors and STAT1.
- Interferon gamma induces selective nuclear localization of ICSBP in proliferating lens epithelial cells.
Conclusions:
- ICSBP expression in the ocular lens suggests non-immunity related functions.
- The established view of ICSBP as solely lymphoid-specific needs revision based on these findings.