WITHDRAWN: LncRNA-ROR is involved in cerebral hypoxia/reoxygenation-induced injury via regulating miR-135a-5p/ROCK1/2

LINC01087 Promotes the Proliferation, Migration, and Invasion of Thyroid Cancer Cells by Upregulating PPM1E

This study is aimed at investigating the effect and mechanism of LINC01087 on the malignant evolution of thyroid cancer cells. The expression levels of LINC01087, miR-135a-5p, and PPM1E in thyroid carcinoma tissues were detected by QRT-PCR. Cell viability was detected using the CCK-8 method. Transwell assay was used to assess the ability of cells to invade. The targeting relationship between LINC01087 and miR-135a-5p was detected by dual luciferase reporting assay. In comparison with normal thyroid tissues and cells, the expression level of LINC01087 in thyroid cancer tissues and TPC-1 and K1 cells increased, and the expression level of miR-135a-5p in thyroid cancer tissues and TPC-1 and K1 cells decreased. LINC01087 knockdown and the high expression of miR-143-3p inhibited the proliferation, invasion, and EMT processes of TPC-1 and K1 in thyroid cancer cells. LINC01087 negatively targeted miR-135a-5p. Has-miR-135a-5p inhibited the malignant evolution and EMT of thyroid cancer by targeting PPM1E. The PPM1E overexpression can reverse the inhibitory effect of LINC01087 gene knockdown on the proliferation, migration, and invasion of thyroid cancer cells. LINC01087 can promote the proliferation and apoptosis of thyroid cancer cells, and its mechanism may be related to the miR-135a-5p/PPM1E axis.

Overexpressed lncRNA ROR Promotes the Biological Characteristics of ox-LDL-Induced HUVECs via the let-7b-5p/HOXA1 Axis in Atherosclerosis

The long non-coding RNA regulator of reprogramming (lncRNA ROR) is involved in atherosclerosis (AS), but the specific mechanism remains unclear. The expressions of lncRNA ROR, let-7b-5p, Homeobox A1 (HOXA1), and apoptosis-associated proteins in the serum of AS patients and human umbilical vein endothelial cells (HUVECs) were determined by quantitative real-time PCR (qRT-PCR) and Western blot. The relationships of lncRNA ROR, let-7b-5p, and HOXA1 were analyzed by Pearson's correlation test. The viability and the migration of HUVECs were measured by Cell Counting Kit-8, wound healing, and Transwell assays. The predicted target gene and the potential binding sites were confirmed by dual-luciferase reporter assay. lncRNA ROR was highly expressed in AS, which promoted the cell viability and migration of HUVECs, while lncRNA ROR silencing produced the opposite results. The expression of let-7b-5p, which bound to lncRNA ROR, was downregulated in AS, indicating that the two genes were negatively correlated. Besides this, let-7b-5p reversed the effects of upregulated lncRNA ROR expression on let-7b-5p expression, cell viability, and migration as well as the expressions of apoptosis-related proteins of ox-LDL-treated HUVECs. HOXA1 was targeted by let-7b-5p and upregulated in AS, with its expression being negatively correlated with let-7b-5p but positively correlated with lncRNA ROR. In ox-LDL-treated HUVECs, overexpressed HOXA1 reversed the effects of let-7b-5p, and HOXA1 silencing reversed the effects of lncRNA ROR. In AS, lncRNA ROR promoted the biological characteristics of oxidation of low-density lipoprotein-induced HUVECs via the let-7b-5p/HOXA1 axis.

Influence of miR-1 on Nerve Cell Apoptosis in Rats with Cerebral Stroke via Regulating ERK Signaling Pathway

To explore the effect of miR-1 on neuronal apoptosis in rats with stroke through the ERK signaling pathway. Methods. Forty male rats (180-220 g) were selected and randomly divided into the sham, model, miR-1 inhibitor, and miR-1 mimic groups (10 rats per group) by average body weight. Cerebral ischemia/reperfusion (I/R) models were established using a modified middle cerebral artery wire thrombosis (MCAO) method in rats in the model group, miR-1 inhibitor group, and miR-1 mimic group. After the successful model establishment, the miR-1inhibitor group and miR-1 mimic group were intravenously injected with miR-1 inhibitor and miR-1 mimic, respectively, once a day for 3 days. The sham and model groups were given the same dose of normal saline. TTC staining was applied to detect the cerebral infarct size and calculate the infarct volume. Histopathological changes in the hippocampus of rat brains were observed by HE staining. Flow cytometry was used to detect neuronal apoptosis in rat brains. The mRNA expressions of miR-1, ERK1/2, Bcl-2, and Bax in rat brain tissues were determined by QRT PCR, and the protein levels of ERK1/2, Bcl-2, Bax, and caspase-3 were determined by Western blot analysis. Results. Compared with the sham group, the neurological impairment score, cerebral infarct size, and volume of rats in the model group were significantly increased (p < 0.05). Compared with the model group, the neurological impairment score, cerebral infarct size, and volume were significantly increased in the miR-1 mimic group and significantly decreased in the miR-1 inhibitor group (p < 0.05). In the model group, the hippocampal tissue of rats had malaligned cells, neuron cell atrophy became smaller, the intercellular spaces became larger, and vacuoles appeared. Compared with the model group, the miR-1 inhibitor group could effectively alleviate the pathological changes in the hippocampus, and the miR-1 mimic group could significantly add to the pathological changes in the rat hippocampus. Compared with the sham group, the mRNA expression of miR-1 and Bax in the brain of model rats increased significantly (p < 0.05), and the mRNA expression of ERK1/2 decreased significantly; Compared with the model group, the miR-1 and Bax mRNA expressions in the brain tissues of rats in the miR-1 inhibitor group were significantly decreased, the ERK1/2 and bcl-2 mRNA expressions were significantly increased, and the miR-1 and Bax mRNA expressions in the brain tissues of rats in the miR-1 inhibitor group were significantly decreased, and the Bcl-2 mRNA expression was significantly increased (p < 0.05). Compared with the sham group, neuronal apoptosis was increased in the brain tissues of rats in the model group and miR-1 mimic group. Compared with the model group, neuronal apoptosis was decreased in the brain tissues of rats in the miR-1 inhibitor group. Compared with the sham group, the ERK1/2 proteins in the model group were significantly decreased, the Bcl-2, Bax, and caspase-3 proteins were significantly increased, and the ERK1/2, Bcl-2, Bax, and caspase-3 proteins in the miR-1 inhibitor group and miR-1 mimic group were significantly increased. Compared with the model group, the protein levels of ERK1/2 and Bcl-2 in the miR-1 inhibitor group were significantly increased, the proteins of Bax and caspase-3 were significantly decreased, and the protein levels of ERK1/2 and Bcl-2 in the miR-1 inhibitor group were significantly increased (p < 0.05). Conclusions. miR-1 can interfere with neuronal apoptosis in rats with stroke through the ERK signaling pathway.