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Induces Embryonic Ζ-Globin Expression Via Thyroid Hormone Receptor Α

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Induces Embryonic Ζ-Globin Expression Via Thyroid Hormone Receptor Α Chen et al. J Hematol Oncol (2021) 14:99 https://doi.org/10.1186/s13045-021-01108-z LETTER TO THE EDITOR Open Access 3,3′,5-Triiodothyroacetic acid (TRIAC) induces embryonic ζ-globin expression via thyroid hormone receptor α Huiqiao Chen1,2,3†, Zixuan Wang1,2†, Shanhe Yu1†, Xiao Han1,2, Yun Deng1,2, Fuhui Wang1, Yi Chen1, Xiaohui Liu1,2, Jun Zhou1,2, Jun Zhu2,4* and Hao Yuan1,2* Abstract The human ζ-globin gene (HBZ) is transcribed in primitive erythroid cells only during the embryonic stages of devel- opment. Reactivation of this embryonic globin synthesis would likely alleviate symptoms both in α-thalassemia and sickle-cell disease. However, the molecular mechanisms controlling ζ-globin expression have remained largely unde- fned. Moreover, the pharmacologic agent capable of inducing ζ-globin production is currently unavailable. Here, we show that TRIAC, a bioactive thyroid hormone metabolite, signifcantly induced ζ-globin gene expression during zebrafsh embryogenesis. The induction of ζ-globin expression by TRIAC was also observed in human K562 erythro- leukemia cell line and primary erythroid cells. Thyroid hormone receptor α (THRA) defciency abolished the ζ-globin- inducing efect of TRIAC. Furthermore, THRA could directly bind to the distal enhancer regulatory element to regulate ζ-globin expression. Our study provides the frst evidence that TRIAC acts as a potent inducer of ζ-globin expression, which might serve as a new potential therapeutic option for patients with severe α-thalassemia or sickle-cell disease. Keywords: ζ-Globin, Thyroid hormone, Thalassemia, Sickle-cell disease To the editor, Embryonic ζ-globin gene expression is normally lim- Te inherited hemoglobin disorders, including thalas- ited to the early stages of primitive erythropoiesis and semia and sickle-cell disease, are an emerging global transcriptionally silenced at 6–7 weeks of gestation [2]. health burden. It is estimated that in excess of 330,000 Relatively little attention has been paid to understanding afected infants are born annually [1]. Tere is an the processes that control ζ-globin expression in the past urgent need to identify new types of agents for these few decades. Intriguingly, recent reports have shown that hemoglobinopathies. continued expression of human ζ-globin is not only able to rescue a lethal α-thalassemia mouse model [3], but also efciently inhibits sickle hemoglobin polymerization in a transgenic mouse model of sickle-cell disease [4], *Correspondence: [email protected]; [email protected] †Huiqiao Chen, Zixuan Wang and Shanhe Yu have contributed equally to suggesting induction of this embryonic globin may act as this study a novel therapeutic for both α-thalassemia and sickle-cell 1 Shanghai Institute of Hematology, State Key Laboratory of Medical disease. However, pharmacologic compounds capable Genomics, National Research Center for Translational Medicine at Shanghai, Ruijin Hospital Afliated to Shanghai Jiao Tong University of activating ζ-globin gene expression have not yet been School of Medicine, Shanghai, China available so far. 2 CNRS-LIA Hematology and Cancer, Sino-French Research Center for Life 3,3′,5-triiodothyroacetic acid (TRIAC, also known Sciences and Genomics, Ruijin Hospital Afliated to Shanghai Jiao Tong University School of Medicine, Shanghai, China as Tiratricol) is a naturally occurring thyroid hormone Full list of author information is available at the end of the article metabolite, with high afnity for thyroid hormone © The Author(s) 2021. Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http:// creat iveco mmons. org/ licen ses/ by/4. 0/. The Creative Commons Public Domain Dedication waiver (http:// creat iveco mmons. org/ publi cdoma in/ zero/1. 0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data. Chen et al. J Hematol Oncol (2021) 14:99 Page 2 of 6 (See fgure on next page.) Fig. 1 Thyroid hormones induce ζ-globin expression. A, B qPCR was performed on RNA from the TRIAC, T3- or T4-treated zebrafsh embryos at 5 dpf and normalized to the level of zebrafsh β-actin. Data shown are the means SEM. Statistical signifcance was calculated using the Student’s ± t test. C, D WISH assay of hbae5 shows TRIAC, T3- or T4-induced ζ-globin gene expression in zebrafsh embryos at 5 dpf, respectively. dpf, days post-fertilization. E TRIAC induced ζ-globin production in hemin-treated K562 cells. qPCR was performed after 48 h of incubation with TRIAC, and normalized to the level of human β-actin. Data shown are the means SEM. Statistical signifcance was calculated using the Student’s t test. F ± Western blots of lysates of TRIAC-treated K562 cells. G Volcano plot of diferentially expressed genes in TRIAC-treated K562 cells compared with control cells. Globin genes are indicated by arrows. FDR, false discovery rate. H Thyroid hormones induced ζ-globin gene expression in primary human erythroid cells. Human CD34+ cells were induced into an erythroid lineage and treated with TRIAC, T3 or T4, respectively. The total RNAs were isolated on day 7 of diferentiation and subjected to qPCR analysis. Data shown are the means SEM. Statistical signifcance was calculated ± using the Student’s t test receptors. It has been used on an empirical basis to treat cells (Fig. 1E, F), although it also has a comparatively patients with thyroid hormone resistance [5]. More weak stimulatory efect on other globin genes expres- recently, TRIAC has also displayed great therapeutic sion. To evaluate genome-wide gene expression changes potential for the treatment of Allan–Herndon–Dudley promoted by TRIAC, we performed RNA sequencing syndrome [6]. Although the relevance and use of TRIAC (RNA-seq) analysis. As expected, TRIAC-treated K562 have been extensively explored over the last decades, its cells showed signifcant induction of HBZ, with a mild role in the regulation of globin gene expression has not induction in other globin levels (Fig. 1G). Tus, these previously been elucidated. experiments indicate that TRIAC preferentially induces As a frst step in seeking whether TRIAC afects globin ζ-globin expression in diferentiated K562 cells. gene expression, we used zebrafsh as a model organism, We next determined whether thyroid hormone was which is an ideal system for modeling erythropoiesis of able to induce ζ-globin expression in primary human humans [7]. Zebrafsh larvae were incubated with TRIAC erythroid cells. To this end, we used human CD34 + for up to 24 h, and then, globin gene expression was hematopoietic stem and progenitor cell (HSPC)-derived assessed by quantitative real-time PCR (qPCR). Te data primary erythroblasts. During erythroid diferentia- showed that TRIAC administration strikingly increased tion, CD34+ cells were incubated with TRIAC, T3 or hbae5 mRNA levels, an ortholog of human HBZ, while T4, respectively. Te total RNA samples were collected had little efect on other embryonic globin genes expres- on day 7 of diferentiation and then subjected to qPCR sion (Fig. 1A). To further confrm this, we examined the analysis. Again, we found that TRIAC, as well as T3 or efect of TRIAC on hbae5 expression by whole-mount T4, triggered an increase in HBZ mRNA levels, as com- mRNA in situ hybridization (WISH). In line with the pared with control cells (Fig. 1H). Collectively, these data qPCR result, we found that the expression of hbae5 was suggest that thyroid hormones could also induce ζ-globin dramatically induced by TRIAC treatment (Fig. 1C). expression in human cells. Since the biological actions of TRIAC closely resemble Te biological efect of thyroid hormone is predomi- those of the bioactive hormone 3,3′,5-triiodothyronine nantly mediated by thyroid hormone receptors, which (T3) [8], we wonder whether T3 or the pro-hormone are encoded by the thyroid hormone receptor α (THRA) thyroxine (T4) has a similar efect. Zebrafsh larvae were and thyroid hormone receptor β (THRB) genes. An treated with T3 or T4 for up to 24 h, and then, qPCR increasing number of reports have implicated that and WISH assay were performed. Expectedly, the results THRA, but not THRB, is required for erythroid devel- showed that both T3 and T4 administration also sig- opment [9–11], implying that ζ-globin expression might nifcantly increase hbae5 transcripts (Fig. 1B, D). Taken be positively regulated by THRA in erythroid cells. To together, these data suggest that thyroid hormones have determine whether THRA was essential for TRIAC- the abilities to selectively induce embryonic ζ-globin gene induced ζ-globin production, we frst knocked down expression in zebrafsh. THRA expression in K562 cells by lentiviral-mediated In order to examine whether thyroid hormone could short hairpin RNA (shRNA). As shown in Fig. 2A, the also induce ζ-globin production in human cells, we used THRA shRNA efciently reduced the THRA mRNA K562-derived erythroid cells. During hemin-induced levels to 10% after 5 days of infection. Western blot erythroid diferentiation of K562 cells, TRIAC was using an anti-THRA antibody further confrmed that added and incubated for up to 48 h, and then, globin the THRA protein level was indeed decreased after gene expression was assessed by qPCR assay and western knockdown of the THRA mRNA (Fig.
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