Knockdown of zinc transporter ZIP5 (SLC39A5) expression significantly inhibits human esophageal cancer progression

摘要

ZIPS is a central player in mammalian zinc metabolism. Studies suggest that ZIP5 is differentially expressed during esophageal tumorigenesis, yet the role of ZIPS in esophageal cancer cells has not yet been clarified. Immunohistochemistry, western blotting and qRT-PCR techniques were used to detect ZIPS expression in esophageal squamous cell carcinoma (ESCC) tissues. We established a stable knockdown ZIPS cell line (KYSE170K) derived from the ESCC cell line KYSE170. We conducted MTT and CCK-8 assays to determine the role of ZIPS in cell proliferation, Transwell assays to detect migration and invasion, and flow cytometry (FCM) to detect apoptosis and cell cycle percentage using KYSE170K cells. We conducted a gene profiling study to detect the expression of genes related to tumor progression. The results demonstrated that ZIPS protein and mRNA expression was highest in ESCC, intermediate in para-carcinoma and lowest in normal tissue. ZIPS knockdown decreased proliferation by 28 and 38%, respectively, according to the MTT and CCK-8 assays. Migration and invasion decreased by 54 and 68%, respectively, according to the Transwell assays. COX2 expression was decreased by 68 and 75% at the mRNA and protein level, respectively, and cyclin D1 mRNA and protein expression was decreased following 62 and 60%, respectively, by knockdown of ZIPS, which upregulated the mRNA and protein expression of E-cadherin by 80 and 60%, respectively. ZIPS knockdown inhibited the proliferation, migration and invasion of ESCC and suppressed COX2, cyclin D1 and E-cadherin expression, which led to the inhibition of cell progression in ESCC.