Background
The significance of long non-coding RNAs, a new class of regulatory RNAs, is progressively emerging in the initiation, progression, and invasion of cancers, including thyroid cancer. PURPL (LINC01021) is one of the novel lincRNAs that has just been identified in a few human cancers. Considering the inadequate comprehension of PURPL expression and its alteration in thyroid cancer, the primary objective of this study was to quantitatively assess PURPL expression in thyroid tissue and to explore its dysregulation in patients with thyroid cancer for the first time.
Materials and methods
The Cancer Genome Atlas database was utilized to evaluate the relative expression of PURPL across various cancer types. Subsequently, quantitative real-time PCR was employed to assess PURPL expression in paired tumor and adjacent tumor-free tissue samples obtained from 30 individuals with thyroid cancer. Bioinformatics analysis was then performed to identify co-expressed genes and associated pathways with PURPL. One of the identified co-expressed genes, MDM2, was further investigated for its correlation with PURPL expression through real-time PCR. Additionally, efforts were made to correlate PURPL expression with clinicopathological features of thyroid cancer.
Results
Real-time PCR analysis revealed the upregulation of PURPL during tumorigenesis in thyroid cancer. However, dysregulation of PURPL did not show a significant correlation with clinical characteristics. Bioinformatics analysis identified approximately 1000 genes correlated with PURPL expression, with MDM2 exhibiting the highest positive correlation. Experimental validation through real-time PCR confirmed a positive correlation between MDM2 and PURPL expression in thyroid cancer cells. Additionally, the oncogenic CASC19 and tumor suppressor TLE5 demonstrated strong positive and negative correlations with PURPL, respectively, suggesting a complex regulatory role in thyroid cancer progression.
Conclusion
The significant upregulation of PURPL in thyroid cancer, along with its positive correlation with oncogenes such as MDM2, underscores the potential role of PURPL in cancer-associated pathways.
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