Primary human thyrocytes maintained the function of thyroid hormone production and secretion in vitro

Area of Science:

• Endocrinology
• Cell Biology
• Biotechnology

Background:

• Thyroid cell lines fail to produce hormones in vitro.
• Primary thyrocytes dedifferentiate ex vivo, hindering hormone detection.
• Exogenous hormones in culture media interfere with endogenous hormone studies.

Purpose of the Study:

• To develop an in vitro culture system for primary human thyrocytes that maintains hormone production and secretion.
• To overcome limitations of existing cell models for studying thyroid physiology and pathology.

Main Methods:

• Established a Transwell culture system for primary human thyrocytes, mimicking thyroid follicle structure.
• Utilized hormone-reduced serum and serum-free culture recipes to eliminate exogenous hormones.
• Cultured thyrocytes on a porous membrane with differential exposure of top and bottom surfaces.

Main Results:

• Transwell system cultures showed higher expression of thyroid-specific genes compared to monolayer cultures.
• Thyroid hormones were detected in the Transwell system, even in serum-free conditions.
• Donor age negatively correlated with in vitro thyrocyte hormone production; FT3 secretion exceeded FT4.

Conclusions:

• Primary human thyrocytes can maintain hormone production and secretion in the Transwell system.
• This system provides a valuable tool for in vitro studies of thyroid function.
• The findings offer new insights into thyroid hormone regulation and thyrocyte behavior.