{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,8]],"date-time":"2026-10-08T18:50:43Z","timestamp":1791485443336,"version":"4.3.4"},"reference-count":62,"publisher":"MDPI AG","issue":"12","license":[{"start":{"date-parts":[[2025,6,17]],"date-time":"2025-06-17T00:00:00Z","timestamp":1750118400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Kuwait University","award":["# MG 04\/19"],"award-info":[{"award-number":["# MG 04\/19"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["IJMS"],"abstract":"<jats:p>Thyroid carcinogenesis has multiple hallmarks, including evasion of tumor suppressors. Reactivation of wild-type p53 function is the ultimate goal in cancer therapy, which requires an understanding of the p53 suppression mechanism specific to the cancer type. MiR-7-5p and IPO7 are implicated in the pathogenesis of several human diseases. This work aims to investigate the role of miR-7-5p and IPO7 in p53 regulation in papillary thyroid cancer (PTC) cells. Primary cultured thyroid cells and FFPE thyroid tissues from PTC and benign cases were used. Functional experiments were performed by transfection with IPO7 siRNA or miR-7-5p mimic\/inhibitor, followed by apoptosis and luciferase reporter assays, immunoblot assays, and RT-PCR. The expression and subcellular localization of IPO7, p53, MDM2, and ribosomal proteins (RPL11 and RPL5) were studied by immunofluorescence staining and confocal microscopy. The results show that IPO7 is overexpressed in PTC and regulated by miR-7-5p. Modulation of IPO7 expression in cultured thyroid cells altered the nucleocytoplasmic shuttling of p53, MDM2, RPL11, and RPL5, in addition to the p53 protein level and activity. The expression pattern of IPO7, p53, and MDM2 in cultured thyroid cells and clinical thyroid tissue specimens confirmed the association between IPO7 overexpression and reduced p53 stability in PTC. In conclusion, the data here show that p53 level and activity are differentially controlled in malignant and benign thyroid cells through miR-7-5P\/IPO7-mediated regulation of RP-MDM2-p53 nucleocytoplasmic trafficking. In PTC, downregulation of miR-7-5p with consequent overexpression of IPO7 might be a protective mechanism used by cancer cells to evade p53 growth suppression during carcinogenesis.<\/jats:p>","DOI":"10.3390\/ijms26125813","type":"journal-article","created":{"date-parts":[[2025,6,17]],"date-time":"2025-06-17T11:53:14Z","timestamp":1750161194000},"page":"5813","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["miR-7-5p and Importin-7 Regulate the p53 Dynamics and Stability in Malignant and Benign Thyroid Cells"],"prefix":"10.3390","volume":"26","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8577-802X","authenticated-orcid":false,"given":"Abeer","family":"Al-Abdallah","sequence":"first","affiliation":[{"name":"Pathology Department, College of Medicine, Kuwait University, P.O. Box 24923, Safat 13110, Kuwait"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Iman","family":"Jahanbani","sequence":"additional","affiliation":[{"name":"Research Core Facility, Health Sciences Center, Kuwait University, P.O. Box 24923, Safat 13110, Kuwait"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bashayer","family":"Al-Shammari","sequence":"additional","affiliation":[{"name":"Research Core Facility, Health Sciences Center, Kuwait University, P.O. Box 24923, Safat 13110, Kuwait"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2025,6,17]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"1338","DOI":"10.1001\/jama.2017.2719","article-title":"Trends in Thyroid Cancer Incidence and Mortality in the United States, 1974\u20132013","volume":"317","author":"Lim","year":"2017","journal-title":"JAMA"},{"key":"ref_2","unstructured":"American Cancer Society (2024, January 31). 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