LncRNA SNHG1 alleviated apoptosis and inflammation during ischemic stroke by targeting miR-376a and modulating CBS/H2S pathway.

BACKGROUND: Ischemic stroke (IS) is a major public health issue causing mortality and disability and is more difficult to treat than other cerebral diseases. Previous study reported that miR-376a was upregulated in the serum of stroke patients, indicating that miR-376a played potential role in occurrence and development of stroke. METHODS: IS cell model was induced by oxygen-glucose deprivation (OGD) exposed HCMEC/D3 cells. The mRNA level of SNHG1, miR-376a and inflammatory cytokines were detected by q-PCR. Protein level of CBS, apoptotic proteins were examined by Western blot. Apoptosis was analyzed by flow cytometry, and H2S level was measured by kit. Interaction among lncRNA, miRNA and target gene was validated by luciferase assay. RESULTS: Our research revealed that mRNA level of SNHG1 and CBS in HCMEC/D3 cells was downregulated while miR-376a was upregulated under OGD conditions. Further results demonstrated that miR-376a overexpression promoted apoptosis and inflammation while SNHG1 overexpressing alleviated such processes. Mechanistically, SNHG1 directly targeted miR-376a, and CBS was a target of miR-376a. Moreover, SNHG1 exert its function via inhibiting miR-376a to regulate CBS expression. CONCLUSION: LncRNA SNHG1 depressed apoptosis and inflammation of IS cell model via inhibiting miR-376a and upregulating CBS/H2S signal. These results show light on underlying mechanisms of IS and provide potential targets for IS therapy.

lncRNA SNHG16 promotes glioma tumorigenicity through miR-373/EGFR axis by activating PI3K/AKT pathway.

Glioma is one of the most common and aggressive malignant primary brain tumor with invariably poor 5-year survival rates. Because of the high recurrence rate and mortality rate, effective therapies for glioma are still weak. Recently, several studies has been proved that long non-coding RNAs (lncRNAs) have been identified to play regulatory mediators in the tumorigenesis of glioma. Nevertheless, the role of lncRNAs and their downstream transcripts are still elusive in the progression of glioma. Small nucleolar RNA host gene 16 (SNHG16), a newly identified lncRNA, has been verified to be up-regulated in human malignant carcinomas. In the present study, we confirmed that lncRNA SNHG16 was highly expressed in glioma and may exert oncogenic function as a competing endogenous RNA (ceRNA) to regulate EGFR by sponging of miR-373-3p through activating PI3K/AKT pathway, which providing a new insight of the regulatory network of lncRNA SNHG16 in the development of glioma.

lncRNA SNHG16 Exerts Oncogenic Functions in Promoting Proliferation of Glioma Through Suppressing p21.

Glioma is a malignant brain tumor that accounts for 30% of all brain tumors and 80% of malignant brain tumors. This poor clinical outcome makes the study of molecular mechanisms in glioma as an urgent subject. However, the certain mechanism remains unclear. Long non-coding RNAs (lncRNAs) plays a key role in glioma development and progression. In the present study, we aimed to explore the potential mechanisms of lncRNA SNHG16 in glioma. The levels of lncRNA SNHG16 were qualified in both glioma tissues and cell lines using qRT-PCR assay. The ability of cell proliferation was tested via CCK-8 and colony formation assays. Transfections were performed to knockdown SNHG16 and its target gene p21. The cell cycles and cell apoptosis were evaluated using flow cytometry, and the expression of SNHG16, p21 and apoptosis biomarkers were qualified with qRT-PCR and western blot assays. The expression of SNHG16 were up-regulated in both glioma tissues and cell lines. Knockdown of SNHG16 was associated with poor proliferation, decreased monoclonal formation rates, but increased apoptosis rates, which also caused the high expression of p21. Moreover, p21 could mediate cell proliferation and monoclonal formation, promote cell apoptosis in glioma, which was negatively correlated with lncRNA SNHG16. The molecule mechanism experiments revealed that SNHG16 could not only inhibit the expression of p21 but also suppressed the level of caspase 3 and 9, while promoted cyclinD1 and cyclinB1 expression. lncRNA SNHG16 could promote the cell proliferation and inhibit the apoptosis of glioma through suppressing p21, indicating that lncRNA SNHG16 might be quite vital for the diagnosis and progression of glioma and could even be a novel therapeutic target for glioma.