Primary Cell Culture Systems for Human Thyroid Studies.

Area of Science:

• Endocrinology
• Cell Biology
• Molecular Biology

Background:

• Thyroid cell models are crucial for in vitro research.
• Permanent cell lines often originate from tumors, necessitating comparison with normal thyroid cells.
• Primary normal thyroid cultures have limitations, including slow growth, limited lifespan, and loss of thyroid characteristics.

Purpose of the Study:

• To evaluate coding and noncoding thyroid markers in different culture systems.
• To determine optimal conditions for in vitro thyroid experimentation using primary cells.

Main Methods:

• Primary human thyroid cells were cultured in two media (6H and h7H).
• Cell morphology and gene expression (9 key thyroid markers) were monitored via RT-PCR at days 8, 21, and 43.
• A pilot study used a 3D hanging-drop culture system.

Main Results:

• Primary thyroid cells grew and retained morphology for the first two weeks.
• Most thyroid gene markers were present by day 21, but declined by day 43.
• lncRNA transcripts PTCSC2 and PTCSC3 were the earliest markers to be lost. The 3D system retained markers longer by day 21.

Conclusions:

• Thyroid cell cultures maintain characteristics up to 21 days.
• Dedifferentiation occurs with the emergence of fibroblast-like cells after 21 days.
• Culture duration is a critical factor for maintaining thyroid cell identity in vitro.