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Autoradiographical evidence for increased thyrotropin binding to autonomously functioning thyroid gland tissue.
H W Müller-Gärtner1, M Jessel, C Schneider
1Department of Nuclear Medicine, University of Hamburg, West-Germany.
Journal of Endocrinological Investigation
|March 1, 1988
Summary
Autonomously functioning thyroid tissue (AFTT) shows significantly increased thyrotropin (TSH) binding compared to normal cells. This heightened TSH binding may explain the overactive metabolism in AFTT.
Area of Science:
- Endocrinology
- Cell Biology
- Molecular Biology
Background:
- Autonomously functioning thyroid tissue (AFTT) can exhibit metabolic hyperactivity.
- Understanding the molecular mechanisms of AFTT is crucial for diagnosing and managing thyroid disorders.
Purpose of the Study:
- To quantify and compare thyrotropin (TSH) binding in AFTT versus non-autonomous thyroid cells.
- To investigate the cellular characteristics of AFTT related to TSH interaction.
Main Methods:
- Cryostatic tissue sections from thyroid adenomas were used.
- Incubation with 125I-labeled TSH followed by autoradiography and reflection photometry.
- TSH-binding density (TBD) was quantified per cell.
Main Results:
- AFTT demonstrated a significant, up to tenfold increase in TSH-binding density (TBD) compared to non-autonomous cells.
- All specimens showed increased TSH molecules bound per thyrocyte in AFTT.
- Increased TBD in AFTT was confirmed after transplantation in nude mice.
Conclusions:
- AFTT exhibits distinct cell membrane characteristics, evidenced by elevated TSH binding.
- Increased TSH binding is a potential cause of metabolic hyperactivity in AFTT.
- Paranodular tissue may also show altered TSH binding, potentially masking autonomous adenoma activity.