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Related Experiment Videos

Enzyme-linked immunosorbent assays for plasminogen activators

F Buessecker1, J Reinartz, U Schirmer

  • 1Institut für Immunologie und Serologie der Universität, Laboratorium für Immunpathologie, Heidelberg, Germany.

Journal of Immunological Methods
|June 18, 1993
PubMed
Summary

This study presents reliable ELISA methods for quantifying urokinase-type plasminogen activator (uPA) and tissue-type PA (tPA) in cell cultures. These assays accurately detect various forms of PA, even with serum present.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Immunology

Background:

  • Plasminogen activators (PAs), including urokinase-type (uPA) and tissue-type (tPA), play crucial roles in physiological and pathological processes.
  • PAs exist in various molecular forms (e.g., single-chain/two-chain tPA, pro-uPA, high/low molecular weight uPA) and can form complexes with inhibitors (PAI-1, PAI-2).
  • Accurate quantification of these distinct PA forms in complex biological matrices like cell culture supernatants is essential for research.

Purpose of the Study:

  • To develop and validate Enzyme-Linked Immunosorbent Assays (ELISAs) for the quantitative analysis of uPA and tPA in cell culture supernatants.
  • To ensure the developed assays can detect various molecular forms of uPA and tPA, including those complexed with inhibitors.
  • To confirm the reliability and ease of use of the ELISA systems for analyzing PAs in both serum-free and serum-containing cell culture media.

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Main Methods:

  • Development of specific monoclonal antibodies targeting distinct molecular forms of uPA and tPA.
  • Establishment of ELISA protocols for the quantitative detection of uPA and tPA.
  • Testing the performance of the assays in the presence of fetal calf serum and in different cell culture supernatant conditions.
  • Integration of ELISA with functional assays for comprehensive PA component analysis.

Main Results:

  • Successfully developed specific ELISAs for quantitative analysis of uPA and tPA.
  • Demonstrated that the assays recognize distinct molecular forms of PAs, irrespective of the presence of fetal calf serum.
  • Confirmed the reliability and ease of performance of the developed test systems.
  • Validated the detection of both uPA and tPA in serum-free and serum-containing cell culture supernatants.

Conclusions:

  • The developed ELISA procedures provide a reliable and straightforward method for quantifying uPA and tPA in cell culture supernatants.
  • These assays are capable of detecting various forms of PAs, even in the presence of common cell culture media components like serum.
  • The ELISA, combined with functional tests, enables comprehensive analysis of PA components in cell lines producing uPA or tPA.