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Related Experiment Videos

Epitope mapping of the human TSH receptor; structure function studies

N Hunt1, J Ruppert, K Willey

  • 1Institute for Hormone and Fertility Research, University of Hamburg, Germany.

Experimental and Clinical Endocrinology & Diabetes : Official Journal, German Society of Endocrinology [And] German Diabetes Association
|January 1, 1996
PubMed
Summary

Researchers created a functional FLAG-tagged human TSH receptor using recombinant DNA technology. This tagged receptor binds TSH and elicits a cAMP response, identical to the wild type, enabling new studies on TSH receptor interactions.

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Area of Science:

  • Molecular Biology
  • Endocrinology
  • Cell Biology

Background:

  • The human TSH receptor (TSHR) is crucial for thyroid hormone regulation.
  • Understanding TSHR function and interactions is vital for diagnosing and treating thyroid disorders.
  • Developing tools to study TSHR is essential for advancing research in endocrinology.

Purpose of the Study:

  • To engineer a functional FLAG-epitope tagged human TSH receptor.
  • To validate the expression, binding affinity, and functional activity of the tagged TSHR.
  • To establish stable cell lines for studying TSHR and its interactions.

Main Methods:

  • Recombinant DNA technology (PCR, site-directed mutagenesis, sequencing) to introduce a FLAG epitope tag.
  • Cloning into a eukaryotic expression vector and stable transfection into HeLa cells.

Related Experiment Videos

  • Immune-precipitation, Western blotting, TSH radio receptor assays, and cAMP response assays to characterize the tagged receptor.

    • Main Results:

    • Successful expression of the FLAG-tagged TSH receptor in HeLa cells, detected via Western blotting.
    • Identification of two distinct protein bands (90-120 KDa), likely representing differentially glycosylated forms.
    • Comparable TSH binding affinity and TSH-stimulated cAMP response between the FLAG-tagged TSHR and wild-type TSHR.

    Conclusions:

    • The FLAG-tagged TSH receptor is functionally equivalent to the wild-type receptor.
    • Stable expression of the tagged TSHR in HeLa cells provides a valuable tool for research.
    • These engineered cell lines will facilitate studies on TSHR/autoantibody interactions and drug discovery.