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Related Experiment Videos

Tumor cell proteinase visualization and quantification using a fluorescent transition-state analog probe.

K A Kozlowski, F H Wezeman, R M Schultz

    Proceedings of the National Academy of Sciences of the United States of America
    |February 1, 1984
    PubMed
    Summary

    This study introduces a fluorescent probe, DnsArgH, for detecting specific proteinases in fibrosarcoma cells. Higher probe fluorescence in tumor cells suggests proteinases play a role in cancer development.

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    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Cancer Research

    Background:

    • Proteinases are enzymes crucial for various cellular processes, and their dysregulation is implicated in diseases like cancer.
    • Developing selective probes for studying proteinase activity in complex biological systems remains a challenge.

    Purpose of the Study:

    • To evaluate the fluorescent proteinase transition-state analog inhibitor, dansyl-L-argininal (DnsArgH), as a selective probe for cysteine and serine proteinases.
    • To investigate the potential role of proteinases in fibrosarcoma malignancy using DnsArgH.

    Main Methods:

    • Utilized DnsArgH as a fluorescent probe to interact with proteinases in HSDM1C1 fibrosarcoma cells and IMR-90 fibroblast controls.
    • Assessed DnsArgH binding affinity and fluorescence yield.

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  • Employed specific inhibitors (diisopropyl fluorophosphate and p-chloromercuribenzoate) to confirm enzyme class specificity.
  • Quantified proteinase concentration and visualized cellular distribution using fluorescence microscopy.

    • Main Results:

    • DnsArgH demonstrated high-affinity binding to proteinases, resulting in a significant increase in fluorescence.
    • Inhibition studies confirmed DnsArgH's interaction with both serine and cysteine proteinases.
    • Immediate fluorescence emission suggested cell surface-associated proteinase binding.
    • Fibrosarcoma cells exhibited substantially higher DnsArgH fluorescence compared to normal fibroblasts, indicating elevated proteinase levels.

    Conclusions:

    • DnsArgH serves as a selective and sensitive fluorescent probe for cysteine and serine proteinases.
    • The increased proteinase activity in fibrosarcoma cells supports a role for these enzymes in malignancy.
    • DnsArgH is a valuable tool for quantifying proteinase concentration and studying their distribution in cancer cells.