{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,17]],"date-time":"2026-08-17T13:25:15Z","timestamp":1786973115853,"version":"build-2736575974"},"reference-count":81,"publisher":"MDPI AG","issue":"8","license":[{"start":{"date-parts":[[2026,8,15]],"date-time":"2026-08-15T00:00:00Z","timestamp":1786752000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Vet. Sci.","Veterinary Sciences"],"abstract":"<jats:p>Feline mammary tumors are the third most common neoplasms in female cats and they are characterized by high aggressiveness and high metastatic rates. Given the pivotal role of iron in human breast cancer development, in this study, we preliminarily explore the immunohistochemical expression of proteins involved in iron uptake, storage and efflux [Transferrin Receptor 1 (TfR1), Transferrin Receptor 2 (TfR2), ferritin (FTH1), and ferroportin (SLC40A1)] in non-metastatic and metastatic feline mammary carcinomas and their tributary lymph node and the possible correlation with hypoxia-inducible factor-1 (HIF-1). Our results showed an increased expression of TfR1 and TfR2 in relation to tumor progression. FTH1 immunolabeling was mainly observed in cancer cells delimiting necrotic areas and in lymph node metastasis, indicating greater iron storage possibly associated with hypoxic environments, as suggested by increased expression of HIF-1\u03b1. Also, an increase in SLC40A1 labeling in tumoral cells suggested greater iron efflux. Although preliminary, our results underline interesting differences between feline normal and tumoral mammary tissues, which could pave the way to further in vitro studies to better understand the role of iron in the progression of feline mammary tumors.<\/jats:p>","DOI":"10.3390\/vetsci13080810","type":"journal-article","created":{"date-parts":[[2026,8,17]],"date-time":"2026-08-17T12:01:26Z","timestamp":1786968086000},"page":"810","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Exploring the Immunohistochemical Expression of Iron-Related Proteins in Non-Metastatic and Metastatic Feline Mammary Carcinomas"],"prefix":"10.3390","volume":"13","author":[{"ORCID":"https:\/\/orcid.org\/0009-0006-1509-5294","authenticated-orcid":false,"given":"Rebecca","family":"Leandri","sequence":"first","affiliation":[{"name":"Department of Biology, University of Naples Federico II, 80126 Naples, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0005-9508-9953","authenticated-orcid":false,"given":"Giorgia","family":"Rosato","sequence":"additional","affiliation":[{"name":"Department of Biology, University of Naples Federico II, 80126 Naples, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Teresa","family":"Chianese","sequence":"additional","affiliation":[{"name":"Department of Biology, University of Naples Federico II, 80126 Naples, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0008-6975-1482","authenticated-orcid":false,"given":"Evaristo","family":"Di Napoli","sequence":"additional","affiliation":[{"name":"Department of Veterinary Medicine and Animal Productions, University of Naples Federico II, 80126 Naples, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1577-4223","authenticated-orcid":false,"given":"Manuela","family":"Martano","sequence":"additional","affiliation":[{"name":"Department of Veterinary Medicine and Animal Productions, University of Naples Federico II, 80126 Naples, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2940-7520","authenticated-orcid":false,"given":"Karen","family":"Power","sequence":"additional","affiliation":[{"name":"Department of Biology, University of Naples Federico II, 80126 Naples, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,8,15]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"98","DOI":"10.1017\/S0022029905001263","article-title":"Feline Mammary Tumours in Comparative Oncology","volume":"72","author":"Zappulli","year":"2005","journal-title":"J. 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