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The distribution of immunoreactive interferon-alpha in normal human tissues
N U Khan1, K A Pulford, M A Farquharson
1Department of Pathology, Royal Infirmary, Glasgow, U.K.
Immunology
|February 1, 1989
Summary
Interferon-alpha (IFN-alpha) is present in most human tissues, even without viral infection. This suggests a role for IFN-alpha in normal physiology and immune defense.
Area of Science:
- Immunology
- Cell Biology
- Histology
Background:
- Interferon-alpha (IFN-alpha) is a cytokine primarily known for its role in antiviral responses.
- Its presence and function in non-infected tissues are less understood.
Purpose of the Study:
- To investigate the cellular distribution of immunoreactive IFN-alpha in normal human tissues.
- To explore the potential physiological roles of IFN-alpha beyond antiviral defense.
Main Methods:
- Analysis of formalin-fixed paraffin-embedded normal human tissues from 36 organs.
- Immunohistochemical staining for IFN-alpha in samples from over 300 individuals without viral infection.
Main Results:
- IFN-alpha was detected in tissue histiocytes across most organs, including Kupffer cells, alveolar macrophages, and lymph node macrophages.
- Positive staining was also observed in parenchymal cells of the choroid plexus, thyroid, pituitary, adrenal cortex, and parathyroid glands.
- The mononuclear phagocyte system showed widespread presence of IFN-alpha.
Conclusions:
- IFN-alpha is constitutively expressed in various normal human tissues, independent of viral infection.
- This widespread distribution suggests a role for IFN-alpha in maintaining normal physiological functions.
- The presence of IFN-alpha in mononuclear phagocytes indicates their potential importance in innate immunity against viral pathogens.