ENTPD2 Transcript-Protein Divergence in Colorectal Cancer and Its Association with miR-708-5p: An Integrative...

Ectonucleoside triphosphate diphosphohydrolase 2 (ENTPD2), an enzyme involved in extracellular nucleotide metabolism and purinergic signaling, has been linked to tumor-immune interactions, although its role in colorectal cancer (CRC) remains unclear. This study examined the expression pattern and regulatory context of ENTPD2 through integrative analysis of transcriptomic, proteomic, microRNA (miRNA), and single-cell transcriptomic datasets. Transcriptomic analyses showed that ENTPD2 mRNA levels are elevated in colorectal tumors compared with normal tissues and that higher expression is associated with shorter relapse-free survival. In contrast, proteomic analyses indicated reduced ENTPD2 protein abundance in tumor samples, suggesting a divergence between transcript and protein expression. Analysis of candidate miRNAs identified miR-708-5p as a potential post-transcriptional regulator, supported by its increased expression in CRC and a predicted binding site within the ENTPD2 3'-untranslated region (UTR). Single-cell transcriptomic datasets further indicated that ENTPD2 transcripts are mainly detected in malignant epithelial cells. We performed a functional validation using dual-luciferase reporter assays, qRT-PCR, and Western blot analysis in CRC cell lines. Experimental analyses demonstrated that miR-708-5p directly targets the ENTPD2 3'UTR in HCT116 cells and suppresses ENTPD2 expression in both HCT116 and HT-29 cells. These findings support a potential contribution of miR-708-5p to ENTPD2 regulation in CRC.