MicroRNA‑1236‑3p/translationally controlled tumor protein (TPT1) axis participates in congenital hypothyroidism progression by regulating neuronal apoptosis

Meng,Tingting; Shen,Shiman; Li,Cheng; Liu,Xuehua

doi:10.3892/etm.2019.8262

MicroRNA‑1236‑3p/translationally controlled tumor protein (TPT1) axis participates in congenital hypothyroidism progression by regulating neuronal apoptosis

Authors:
- Tingting Meng
- Shiman Shen
- Cheng Li
- Xuehua Liu
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Affiliations: Pediatric Blood Care Station, The First Hospital of Jilin University, Changchun, Jilin 130012, P.R. China
Published online on: November 29, 2019 https://doi.org/10.3892/etm.2019.8262
Pages: 459-466
Copyright: © Meng et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

Congenital hypothyroidism (CH) is an endocrine disease caused by congenital thyroid hormone (TH) deficiency. MicroRNAs (miRNAs or miRs) have been reported to inhibit the progression of congenital hypothyroidism. However, the expression and role of miR‑1236‑3p in CH remains unclear. To address this, 12 day old Sprague‑Dawley rats were divided into five groups: Control; Congenital hypothyroidism (CH), miR‑1236‑3p inhibitor control (inhibitor control); miR‑1236‑3p inhibitor (inhibitor); and miR‑1236‑3p inhibitor + translationally‑controlled tumor protein 1 (TPT1)‑small interfering (si)RNA (inhibitor + siRNA). Propylthiouracil (50 mg/day) was injected intraperitoneally into pregnant rats to generate pups with CH. The levels of miR‑1236‑3p and TPT1 were detected via reverse transcription‑quantitative PCR and western blot analysis. Bioinformatics analysis was performed to predict the targets of miR‑1236‑3p, which was confirmed using dual luciferase reporter assay. Flow cytometry and MTT assay were used to measure neuronal cell apoptosis and cell viability, whereas western blotting was applied to detect the expression of Pim‑3, p‑Bad (Ser112), Bad and Bcl‑xL, proteins associated with apoptosis. The results revealed that miR‑1236‑3p expression was significantly upregulated, whilst TPT1 expression was significantly downregulated in the hippocampus tissues of CH rats compared with the control group. TPT1 was confirmed as a target of miR‑1236‑3p. MiR‑1236‑3p inhibitor prevented hippocampal neuron apoptosis induced by CH induction, which was reversed by TPT1‑siRNA transfection. In addition, following miR‑1236‑3p inhibitor transfection, neuronal cell apoptosis significantly reduced compared with the control group, which was accompanied by significantly increased expressions of Pim‑3, p‑Bad (Ser112) and Bcl‑xL expression. These effects were reversed by TPT1‑siRNA co‑transfection. These results indicated that inhibition of miR‑1236‑3p expression inhibited neuron apoptosis in vivo and in vitro by targeting TPT1, serving a protective role in CH.

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