Abstract
Purpose
Thyroid cell lines are useful tools to study the physiology and pathology of the thyroid, however, they do not produce or secrete hormones in vitro. On the other hand, the detection of endogenous thyroid hormones in primary thyrocytes was often hindered by the dedifferentiation of thyrocytes ex vivo and the presence of large amounts of exogenous hormones in the culture medium. This study aimed to create a culture system that could maintain the function of thyrocytes to produce and secrete thyroid hormones in vitro.
Methods
We established a Transwell culture system of primary human thyrocytes. Thyrocytes were seeded on a porous membrane in the inner chamber of the Transwell with top and bottom surfaces exposed to different culture components, mimicking the ‘lumen-capillary’ structure of the thyroid follicle. Moreover, to eliminate exogenous thyroid hormones from the culture medium, two alternatives were tried: a culture recipe using hormone-reduced serum and a serum-free culture recipe.
Results
The results showed that primary human thyrocytes expressed thyroid-specific genes at higher levels in the Transwell system than in the monolayer culture. Hormones were detected in the Transwell system even in the absence of serum. The age of the donor was negatively related to the hormone production of thyrocytes in vitro. Intriguingly, primary human thyrocytes cultured without serum secreted higher levels of free triiodothyronine (FT3) than free thyroxine (FT4).
Conclusion
This study confirmed that primary human thyrocytes could maintain the function of hormone production and secretion in the Transwell system, thus providing a useful tool to study thyroid function in vitro.
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Data availability
All data will be available upon requests directed to the corresponding authors.
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Acknowledgements
The authors thank Professor Koichi Suzuki (Teikyo University, Tokyo, Japan) sincerely for his generous advice during the progression of this study.
Funding
This work was supported by the National Natural Science Foundation of China #81900712.
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BJ and CW contributed to this work equally. LS, and YL contributed to the study concept and design. BJ, CQ, CJ, and CZ contributed to the acquisition of data (sample collection, processing, performance of experiment, etc.). CW, YC, and FC contributed to the analysis, interpretation, and statistical analysis. YL and CW contributed to the drafting of the manuscript. LS and FC contributed to the critical revision of the manuscript for important intellectual content. All authors read and approved the final manuscript.
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This study was performed in line with the principles of the Declaration of Helsinki. Approval was granted by the Ethical Committee of the institutional review boards of Nanjing Drum Tower Hospital, Nanjing, China (No. 2021-601-02).
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40618_2023_2103_MOESM1_ESM.pdf
Supplementary file1 (PDF 52 KB) Supplementary Fig. 1 Transwell system and monolayer culture of primary human thyrocytes. (a) In the Transwell system, primary human thyrocytes were seeded on a porous membrane of the inner chamber. After cells reached 100% confluency, the inner chamber was refilled with DMEM while the outer chamber with DMEM supplemented with 10% FBS or otherwise indicated. Thus, the up and bottom surfaces of primary human thyrocytes, mimicking the apical and basal sides, could access different culture components. (b) In a conventional monolayer culture, the primary human thyrocytes has only one surface unattached that was exposed to DMEM supplemented with 10% FBS. (c) For analysis of thyroid-specific genes, primary human thyrocytes were seeded in Transwell system using DMEM supplemented with 10% FBS and cultured for 6 days. On day 7, the inner chamber was refilled with DMEM, and the outer chamber with DMEM supplemented with 10% FBS. (d) For analysis of thyroid hormones, primary human thyrocytes were seeded in Transwell system using DMEM supplemented with 10% FBS and cultured for 6 days. On day 7, the inner chamber was refilled with DMEM, and the outer chamber with the cFBS-formulated medium or the rHSA-formulated medium (details in Materials and Methods). The medium of the outer chamber was then collected on day 10 and day 14 and subjected to hormone analysis. Supplementary Fig. 2 The workflow of embedding and cryostat of the porous membrane with cultured primary human thyrocytes. The porous membrane (on which the primary human thyrocytes were seeded) of Transwell was carefully removed from the inner chamber and dehydrated. For dehydration, the membrane was first placed in 30% sucrose at 4°C for overnight and then in a mixture of 30% sucrose and cryostat embedding media OCT (1:1) at room temperature for 2h. The dehydrated membrane was then cut into pieces and embedded in OCT in a vertical position followed by cryostat of a transverse plane
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Jiang, B., Wang, C., Qu, C. et al. Primary human thyrocytes maintained the function of thyroid hormone production and secretion in vitro. J Endocrinol Invest 46, 2501–2512 (2023). https://doi.org/10.1007/s40618-023-02103-6
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DOI: https://doi.org/10.1007/s40618-023-02103-6