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Related Experiment Videos

Plasminogen activators in human malignant melanoma.

G Markus, S Kohga, S M Camiolo

    Journal of the National Cancer Institute
    |June 1, 1984
    PubMed
    Summary

    Melanoma tissue showed low plasminogen activator activity, primarily of the urokinase type, localized to cell membranes. This contrasts with other studies on metastatic melanoma cell cultures.

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    Area of Science:

    • Oncology
    • Biochemistry
    • Cell Biology

    Background:

    • Plasminogen activators (PAs) play roles in tumor invasion and metastasis.
    • Previous studies suggested tissue-type PA (t-PA) is dominant in melanoma cell lines.

    Purpose of the Study:

    • To investigate plasminogen activator activity and type in metastatic malignant melanoma tissue and organ cultures.
    • To compare findings with existing literature on melanoma cell lines.

    Main Methods:

    • Azocaseinolysis assay for PA activity in tumor extracts and organ culture medium.
    • Immunoinhibition with anti-urokinase antibody and SDS-PAGE zymography to determine PA type.
    • Immunoperoxidase staining for urokinase localization.

    Main Results:

    • Metastatic melanoma tissue exhibited low extractable PA content and secretion rates.
    • Urokinase-type PA (u-PA) constituted a significant portion (77% in extracts, 90% in culture fluids) of the total activity.
    • Immunoperoxidase staining localized u-PA primarily to the melanoma cell membrane.

    Conclusions:

    • Metastatic melanoma tissue displays predominantly urokinase-type plasminogen activator activity.
    • The high prevalence of u-PA in tissue contrasts with findings of t-PA dominance in cultured melanoma cells.
    • This discrepancy warrants further investigation into factors influencing PA expression in melanoma.

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