[Role of Circular RNA in Diagnosis, Development and Durg Resistance of Lung Cancer]

CircWHSC1 (CircNSD2): A Novel Circular RNA in Multiple Cancers

Circular RNAs (circRNAs) are a type of non-coding RNA (ncRNA) that possesses a unique single-stranded circular structure. They are primarily formed through alternative splicing of pre-mRNA (messenger RNA). The primary biological function of circRNAs is to regulate gene expression at both the transcriptional and post-transcriptional levels. Recent studies have increasingly demonstrated a close association between the dysregulation of circRNAs and the progression of diverse cancers, where they can function as either tumor suppressors or oncogenes. circWHSC1 (circNSD2) is a circular ncRNA that originates from the first 2 exons of the Wolf-Hirschhorn syndrome candidate gene (WHSC1). As Chen 2019 discovery that circWHSC1 (circNSD2) functions as a sponge for miRNAs and promotes cancer, this circRNA has garnered significant interest among researchers. circWHSC1 (circNSD2) has been found to be up-regulated in various malignant tumors, including nasopharyngeal carcinoma, lung cancer, breast cancer, liver cancer, colorectal cancer, ovarian cancer, cervical cancer, and endometrial cancer. It exerts its effects on cancer by either inhibiting or promoting the expression of related genes through direct or indirect pathways, ultimately affecting cancer proliferation, invasion, and prognosis. This article provides a comprehensive review and discussion of the biological roles of circWHSC1 (circNSD2) and its target genes in various cancers, as well as the latest research progress on related molecular biological regulatory mechanisms. Furthermore, the potential significance of circWHSC1 (circNSD2) in future clinical applications and transformations is thoroughly analyzed and discussed.

Circ_0137287 suppresses cell tumroigenesis and aerobic glycolysis in papillary thyroid carcinoma through miR-183-5p/PPP2R2A axis

Circ_0137287 was found to be decreased in papillary thyroid cancer (PTC) tissues and related to aggressive clinicopathologic characteristics. However, the role and mechanism of circ_0137287 in PTC remain vague. Circ_0137287 expression was decreased in PTC and its low expression predicted poor survival. The ROC analysis suggested circ_0137287 might be a marker for PTC diagnosis. Circ_0137287 overexpression in PTC cells impaired cell proliferation, migration, invasion, and aerobic glycolysis, but induced apoptosis in vitro and in vivo. Circ_0137287 specifically bound to miR-183-5p, and miR-183-5p reversed the inhibitory effects of circ_0137287 on PTC tumor growth, motility and aerobic glycolysis. MiR-183-5p directly targeted PPP2R2A, and promoted PTC progression through regulating PPP2R2A. Mechanistically, circ_0137287 could indirectly modulate PPP2R2A expression through targeting miR-183-5p. Circ_0137287 suppressed PTC tumorigenesis and aerobic glycolysis through up-regulating PPP2R2A via miR-183-5p absorption, indicating a promising prognostic, diagnostic and therapeutic target.