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Related Experiment Videos

Sodium iodide symporter and pendrin expression in human thyroid tissues.

C Mian1, L Lacroix, L Alzieu

  • 1Department of Clinical Biology, Institut Gustave-Roussy, Villejuif, France.

Thyroid : Official Journal of the American Thyroid Association
|September 29, 2001
PubMed
Summary

Thyroid hormone synthesis involves iodide transport via sodium iodide symporter (NIS) and pendrin. Their expression varies in normal and diseased thyroids, with higher levels in hyperfunctioning tissues.

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Area of Science:

  • Endocrinology
  • Molecular Biology
  • Cell Biology

Background:

  • Thyroid hormone synthesis relies on iodide transport across thyrocyte membranes.
  • Sodium iodide symporter (NIS) and pendrin are key proteins involved in this iodide transport.
  • Characterization of NIS and pendrin provides insights into thyroid function.

Purpose of the Study:

  • To investigate the expression of NIS and pendrin at mRNA and protein levels in normal and pathological human thyroid tissues.
  • To correlate NIS and pendrin expression with thyroid function and disease states.
  • To identify different thyrocyte populations based on NIS and pendrin expression.

Main Methods:

  • Quantitative reverse transcription-polymerase chain reaction (RT-PCR) for mRNA analysis.

Related Experiment Videos

  • Single and double immunostaining for protein expression analysis.
  • Examination of normal, hyperfunctioning (Graves' disease, toxic adenoma), and hypofunctioning (adenomas, carcinomas) thyroid tissues.

    • Main Results:

    • NIS and pendrin were detected in 20% and 40%-60% of normal thyrocytes, respectively.
    • Hyperfunctioning tissues showed significantly higher NIS and pendrin-positive cell counts compared to normal tissue.
    • Hypofunctioning tissues and carcinomas exhibited low or absent NIS and pendrin expression.
    • Three thyrocyte populations were identified: NIS-/pendrin-, NIS+/pendrin+, and NIS-/pendrin+.

    Conclusions:

    • NIS and pendrin expression levels are indicative of thyroid cell activity and thyroid disease status.
    • NIS-positive/pendrin-positive cells likely represent active thyrocytes.
    • The functional role of NIS-negative/pendrin-positive thyrocytes requires further investigation.