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Bulk RNA-Seq of Foxe1KO and control Nkx2-1/mKO2+ mouse ESC-derived cells

ABSTRACT: Functional thyroid follicles generation in vitro is obtained at high efficiency by doxycycline-mediated expression of Nkx2-1 and Pax8, two proteins involved in early specification of thyroid lineage. Although those factors are sufficient to induce thyroid specification in vitro, other players, such as Foxe1, are also present in early thyroid primordium and its loss-of-function is responsible for thyroid congenital defects in mice and humans. Here we show that Foxe1KO mESCs can be induced to differentiate towards thyroid lineage but the efficiency of thyroid follicular cells generated is drastically low. Moreover, correct expression of maturation genes and capacity to produce thyroid hormone in vitro are completely disrupted. On the other hand, Nkx2-1 expressing cells derived from Foxe1KO have an unexpected ability to deviate to a lung epithelium differentiation program and form organoids containing multiple lung cell types. These findings demonstrate that Foxe1 is required to reinforce thyroid cell fate in vitro and to promote terminal maturation of thyroid follicles.

ORGANISM(S): Mus musculus

PROVIDER: GSE182480 | GEO | 2023/12/31

REPOSITORIES: GEO

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Project description:Amiodarone reversibly decreases sodium-iodide symporter mRNA expression at therapeutic concentrations and induces antioxidant responses at supraphysiological concentrations in cultured human thyroid follicles Amiodarone, a potent antiarrhythmic agent, is a highly active oxidant, exerting cytotoxic effects on thyrocytes at pharmacological concentrations. Patients receiving amiodarone usually remain euthyroid, but occasionally develop thyroid dysfunction, such as amiodarone-associated hypothyroidism or amiodarone-induced thyrotoxicosis. To elucidate the mechanism by which amiodarone elicits thyroid dysfunction, human thyroid follicles were cultured with TSH and amiodarone at therapeutic (1-2 microM) and pharmacological (10-20microM) concentrations, and the drug-induced effect on whole human gene expression was analyzed by cDNA microarray. Amiodarone at 1-2microM decreased the expression level of the sodium-iodide symporter (NIS) to nearly half, but did not affect genes participating in thyroid hormonogenesis (thyroid peroxidase, thyroglobulin, pendrin, NADPH oxidase). Higher concentrations (10-20 microM) decreased the expression of all these genes, accompanied by increased expression of antioxidant proteins such as heme oxygenase 1 and ferritin. When thyroid follicles obtained from a patient with Graves’ disease who had been treated with amiodarone for 2 months before thyroidectomy were cultured in amiodarone-free medium, TSH-induced thyroid function was intact, suggesting that amiodarone at a maintenance dose did not elicit any cytotoxic effect on thyrocytes. The ultrastructural features of cultured thyroid follicles were compatible with these in vitro findings. These in vitro and ex vivo findings suggest that patients taking maintenance doses of amiodarone usually remain euthyroid, probably due to escape from the Wolff-Chaikoff effect mediated by decreased expression of NIS mRNA. Furthermore, amiodarone is not cytotoxic for thyrocytes at therapeutic concentrations but elicits cytotoxicity through oxidant activity at supra-physiological concentrations. Keywords: Cultured human thyroid follicles

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Bulk RNA-Seq of Foxe1KO and control Nkx2-1/mKO2+ mouse ESC-derived cells

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