Expression of pendrin in benign and malignant human thyroid tissues

Area of Science:

• Endocrinology
• Molecular Biology
• Oncology

Background:

• The Pendred syndrome gene (PDS) encodes pendrin, a transmembrane protein crucial for apical iodide transport in follicular thyroid cells.
• Pendrin expression is linked to thyroid tissue function and has been investigated in various thyroid neoplasms.

Purpose of the Study:

• To investigate pendrin expression and localization in normal thyroid tissue and different types of thyroid tumors.
• To correlate pendrin expression levels with tumor characteristics such as type, size, and stage.

Main Methods:

• Immunohistochemistry (IHC) was used to detect pendrin protein.
• Western blot and RT-quantitative real-time PCR were employed to assess pendrin at the molecular level.
• Analysis included normal thyroid tissue, nodular goiters, Graves' disease, follicular adenomas, follicular thyroid carcinomas (FTC), and papillary thyroid carcinomas (PTC).

Main Results:

• Pendrin was expressed at the apical pole in normal, goiter, and Graves' disease tissues.
• In follicular adenomas, pendrin was found in both cell membranes and cytoplasm.
• In FTC and PTC, pendrin was predominantly cytoplasmic, with reduced apical localization, and mRNA levels were lower in cancers than normal tissues.

Conclusions:

• Pendrin is expressed in the majority of differentiated thyroid tumors, but its apical targeting is impaired.
• Altered pendrin localization may affect iodide transport in thyroid neoplasms.
• Pendrin expression varies significantly among individuals and tumor types.