A single-nucleotide polymorphism in lnc-LAMC2-1:1 interferes with its interaction with miR-128 to alter the expression of deleted in colorectal cancer and its effect on the survival rate of subjects with ovarian cancer

PVT1 inhibition stimulates anti-tumor immunity, prevents metastasis, and depletes cancer stem cells in squamous cell carcinoma

Cancer stem cells (CSCs) cause tumor metastasis and immune evasion by as-yet-unknown molecular mechanisms. In the present study, we identify a long noncoding RNA (lncRNA), termed PVT1, which is highly expressed in CSCs and correlated closely with lymph node metastasis of head and neck squamous cell carcinoma (HNSCC). PVT1 inhibition eliminates CSCs, prevents metastasis, and stimulates anti-tumor immunity, while inhibiting HNSCC growth. Moreover, PVT1 inhibition promotes the infiltration of CD8⁺ T cells into the tumor microenvironment, thereby enhancing immunotherapy by PD1 blockade. Mechanistically, PVT1 inhibition stimulates the DNA damage response, which induces CD8⁺ T cell-recruiting chemokines, while preventing CSCs and metastasis via regulating the miR-375/YAP1 axis. In conclusion, targeting PVT1 might potentiate the elimination of CSCs via immune checkpoint blockade, prevent metastasis, and inhibit HNSCC growth.

RHPN1‑AS1 promotes ovarian carcinogenesis by sponging miR‑6884‑5p thus releasing TOP2A mRNA

Ovarian cancer, a severe lethal gynecological malignancy, is characterized by both high morbidity and mortality. Long noncoding RNAs (lncRNAs) have recently caused extensive concern due to their regulatory function in various human tumors. There are a mounting number of lncRNAs that are in extreme need of research, serving as biomarkers for diagnosis and therapy for ovarian cancer. In the present study, RT-qPCR was employed to detect how Rhophilin Rho GTPase binding protein 1 antisense RNA1 (RHPN1-AS1), miR-6884-5p and DNA topoisomerase IIα (TOP2A) are expressed in ovarian cancer tissues or cell lines. BrdU, MTT, colony formation and cell adhesion assays, caspase-3 activity, flow cytometry and wound healing assay were employed to assess cell proliferation, viability, colony number, adhesion, apoptosis and migration in ovarian cancer, respectively. RHPN1-AS1 was determined to be enriched in ovarian cancer tissues and cell lines. Silencing of RHPN1-AS1 was reported to increase cell apoptosis and impair cell proliferation, viability, colony number, adhesion and migration in vitro. Furthermore, RHPN1-AS1 was able to sponge miR-6884-5p which directly targets TOP2A in ovarian cancer. Notably, silencing of RHPN1-AS1 functionally reversed the oncogenic effect induced by the miR-6884-5p inhibitor, while the miR-6884-5p inhibitor markedly restored the inhibition of ovarian carcinogenesis modulated by silencing TOP2A in ovarian cancer. RHPN1-AS1 was found to promote ovarian carcinogenesis via sponging miR-6884-5p thus releasing TOP2A, and RHPN1-AS1 may act as a promising biomarker for the prognosis and therapy of ovarian cancer.

microRNA-128 mediates CB1 expression and regulates NF-KB/p-JNK axis to influence the occurrence of diabetic bladder disease

Background

Diabetic bladder disease is common complications of diabetes, its symptoms are diverse, can be due to different stages. In this study we investigate the mechanism of miR-128 targeting CB1 expression to mediate the occurrence of diabetic bladder disease.

Methods

Bioinformatics analysis predicts related regulatory factors of miR-128 in diabetic bladder disease. Models of diabetic bladder lesions were constructed in male SD rats by intraperitoneal injection of streptozotocin at 65 mg/kg body weight. The expression of miR-128 and CB1 mRNA in bladder tissues of each group was detected by RT-qPCR, and CB1, NF-KB, p-JNK and Bcl2 protein expression was detected by Western Blotting. We tested the function of the bladder by urodynamics, detected the pathological characteristics of the bladder tissue by HE staining, and verified the targeting relationship between miR-128 and CB1 through the prediction of the biological website, dual luciferase reporter gene assay and RIP.

Results

miR-128 was highly expressed in the bladder tissue of diabetic rats. Inhibition of miR-128 could improve the occurrence of diabetic bladder lesions in rats. miR-128 could target the inhibition of CB1 expression, and high expression of CB1 could antagonize miR-128 against diabetic bladder. In the diabetic bladder, miR-128 can regulate the expression of NF-KB and p-JNK through CB1 and affect the level of apoptosis. miR-128 regulates NF-KB/p-JNK through CB1, thus affecting the occurrence of diabetic bladder disease.

Conclusion

The high expression of miR-128 can down-regulate the expression of CB1, promote the activation of NF-KB and p-JNK, increase the level of apoptosis and promote the occurrence of diabetic bladder disease.