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Related Experiment Videos

Alpha-1-antitrypsin in human macrophages.

P Isaacson, D B Jones, G H Millward-Sadler

    Journal of Clinical Pathology
    |September 1, 1981
    PubMed
    Summary

    Alpha-1-antitrypsin (A1AT) reliably marks histiocytes and related cancers. This immunohistochemical marker is synthesized by these cells, confirming its diagnostic value for lymphoreticular neoplasms.

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    Area of Science:

    • Immunohistochemistry
    • Oncology
    • Cell Biology

    Background:

    • Alpha-1-antitrypsin (A1AT) has shown potential as an immunohistochemical marker for histiocytes (monocytes/macrophages).
    • Further validation is needed to confirm its reliability in identifying histiocytic cells and neoplasms.

    Purpose of the Study:

    • To confirm the reliability of alpha-1-antitrypsin (A1AT) as an immunohistochemical marker for histiocytes.
    • To evaluate A1AT's utility in diagnosing lymphoreticular neoplasms of histiocytic origin.

    Main Methods:

    • Immunoperoxidase staining was performed on various benign and malignant lymphoreticular tissues.
    • Immunodiffusion, isotope labeling, and isoelectric focusing were used to analyze A1AT in cell lysates.

    Main Results:

    • Positive A1AT staining was exclusively observed in histiocytes.
    • Studies confirmed that monocytes and malignant histiocytes synthesize their own A1AT, identical to serum A1AT.

    Conclusions:

    • Immunoperoxidase staining for A1AT is a dependable marker for identifying histiocytes.
    • This marker is reliable for diagnosing lymphoreticular neoplasms originating from true histiocytes.

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