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Summary
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Human embryonic stem cells were differentiated into functional thyroid cells using PAX8 and NKX2-1 transcription factors. These cells formed three-dimensional thyroid follicles capable of radioiodine uptake, demonstrating a new method for generating thyroid cell lines.

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Area of Science:

  • Stem cell biology
  • Endocrinology
  • Developmental biology

Background:

  • Human thyroid cell speciation mechanisms are not fully understood.
  • Overexpression of Pax8 and Nkx2-1 in murine stem cells induces thyroid differentiation and follicular organization.

Purpose of the Study:

  • To recapitulate thyroid cell differentiation and follicular formation using human embryonic stem cells (hESCs).
  • To generate functional human thyroid cell lines from hESCs.

Main Methods:

  • Human embryonic stem cells (H9 line) were transduced with lentiviral vectors to express PAX8-eGFP and NKX2-1-mCherry.
  • Differentiation was induced using Activin A and thyrotropin (TSH).
  • Thyroid-specific gene expression and protein production were assessed via RT-PCR and immunostaining.

Main Results:

  • Efficient expression of PAX8 and NKX2-1 in hESCs was achieved.
  • Induced cells expressed key thyroid-specific genes (TG, TPO, NIS, TSHR).
  • Differentiated cells formed three-dimensional thyroid follicles with thyroglobulin in lumens and exhibited TSH-stimulated cAMP generation and radioiodine uptake.

Conclusions:

  • Induced expression of PAX8 and NKX2-1 promotes hESC differentiation into functional thyroid epithelial cells.
  • These cells commit to forming three-dimensional neo-follicular structures.
  • This study provides proof of principle for generating functional human thyroid cells from hESCs.