Transplantable human thyroid organoids generated from embryonic stem cells to rescue hypothyroidism
Preprint posted on 1 December 2021 https://www.biorxiv.org/content/10.1101/2021.12.01.470729v1?ct=
Categories: cell biology, developmental biology
Background
The thyroid gland uses iodine to produce thyroid hormones (TH) that regulate the body’s growth and metabolism. Insufficient TH production leads to hypothyroidism, a common disorder that causes symptoms ranging from fatigue and weight gain to impaired cardiac function. TH replacement therapy for hypothyroidism was established more than a century ago and is currently based on supplementation with the synthetic hormone levothyroxine1. However, there is mounting evidence that it inadequately treats up to one-third of patients and new therapeutic approaches are needed2.
In the last decade, stem cell-derived self-organized microtissues called organoids have become powerful tools for disease modeling and drug discovery3. Another ambitious but so far lesser-explored application of organoids is to use them as a source of tissue for regenerative medicine. Highly functional thyroid organoids generated from mouse pluripotent stem cells have already been reported, but it remains challenging to translate the technology to human pluripotent stem cells. Organoids obtained from human adult thyroid cells, on the other hand, have shown limited in vivo functionality4. In this preprint, the authors used forward programming to establish human embryonic stem cell-derived thyroid organoids that recapitulate key features of thyroid morphology and function in vitro and in vivo.
Key findings
The authors first engineered a human embryonic stem cell (ESC) line allowing doxycycline-inducible expression of the transcription factors NKX2-1 and PAX8, which they had previously shown to drive thyroid differentiation of mouse ESCs5. Indeed, after endoderm induction of embryoid bodies, the transient overexpression of NKX2-1 and PAX8 activated an endogenous thyroid differentiation program. The composition of the culture media was then optimized to promote maturation, resulting in monolayer-organized thyroid follicles with well-delimited lumen around day 45 of differentiation. Single-cell RNA sequencing (scRNA-Seq) of these structures allowed the characterization of three populations of thyroid cells – progenitors, immature thyrocytes, and mature thyrocytes – showing progressive upregulation of mature thyroid markers such as TG, TSHR, and TPO. Extending the culture time by another two weeks further increased the expression of these markers and culminated in TH hormone synthesis, as shown by the accumulation of the hormone thyroxine (T4) in the lumen of the follicles (Fig. 1).
Figure 1. Human ESC-derived thyroid follicular structures. (a-d) Immunofluorescence staining for NKX2-1, E-cadherin, TG, TPO, and T4 at day 58 of differentiation. Adapted from Figure 2 of this preprint.
To test the in vivo functionality of the organoids, the authors then transplanted them under the kidney capsule of immunodeficient NOD-SCID mice which had undergone thyroid ablation. After 4 weeks, SPECT-CT imaging showed that the implanted follicles could efficiently take up the radioactive iodine isotope 123I. Importantly, there was also a notable increase in plasma T4 levels in transplanted animals compared to non-transplanted controls.
In conclusion, the organoids established by Romitti and colleagues not only offer a platform to study various facets of thyroid biology in vitro but could also pave the way towards human stem cell-based regenerative therapy for hypothyroidism.
Why I chose this preprint
Remarkable progress has been made in the generation of human organoids mimicking various systems of the body. However, compared to the explosion of their use in various in vitro applications, organoid-based regenerative medicine is still in its infancy. I was therefore quite fascinated by the achievements presented in this study, which suggest that implanted organoids can have a significant impact at the systemic level.
References
- Wiersinga, W. M. Thyroid hormone replacement therapy. Horm. Res. Paediatr. 56, 74–81 (2001).
- Dew, R. et al. Clinical, behavioural and pharmacogenomic factors influencing the response to levothyroxine therapy in patients with primary hypothyroidism—protocol for a systematic review. Syst. Rev. 6, (2017).
- Kim, J., Koo, B.-K. & Knoblich, J. A. Human organoids: model systems for human biology and medicine. Nat. Rev. Mol. Cell Biol. 21, 571–584 (2020).
- Ogundipe, V. M. L. et al. Generation and Differentiation of Adult Tissue-Derived Human Thyroid Organoids. Stem Cell Reports 16, 913–925 (2021).
- Antonica, F. et al. Generation of functional thyroid from embryonic stem cells. Nature 491, 66–71 (2012).
Posted on: 10 January 2022
doi: https://doi.org/10.1242/prelights.31254
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Sanjay Pillay
when will a “cure” for hypothyroidism be made available to the public? I was rendered hypothyroid through radioactive iodine for my graves disease..can this be reveresed through stem cells?