{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,15]],"date-time":"2026-10-15T12:35:50Z","timestamp":1792067750521,"version":"4.4.0"},"reference-count":69,"publisher":"Bioscientifica","issue":"5","funder":[{"DOI":"10.13039\/100009863","name":"Neuroendocrine Tumor Research Foundation","doi-asserted-by":"publisher","id":[{"id":"10.13039\/100009863","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100005032","name":"Funda\u00e7\u00e3o Bial","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100005032","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["journals.bioscientifica.com"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2025,5,1]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>The crosstalk between tumour cells and microenvironment components in pituitary neuroendocrine tumours (PitNETs), including chemokines, may impact tumour behaviour and clinical outcomes. CCL2 was previously identified as a key chemokine in PitNETs, but its role remains unknown. We aimed to study the role of CCL2 in defining the phenotype and clinical outcomes of PitNETs and in regulating macrophage chemotaxis, epithelial-to-mesenchymal transition (EMT) and angiogenesis. We studied CCL2 and E-cadherin expression, macrophages (CD68 and CD163) and vessels (CD31) in samples from 86 PitNET patients. Higher CCL2 mRNA expression was found in patients who required multimodal and multiple treatments and had active disease at the last follow-up. Higher CCL2 immunoreactivity was observed in patients with larger PitNETs. Among somatotroph tumours, CCL2 mRNA expression correlated with serum IGF-1 at the last follow-up. CCL2 mRNA expression levels correlated negatively with CDH1 expression and with E-cadherin complete membranous staining. In vitro, CCL2 downregulated E-cadherin expression in GH3 cells but did not affect cell morphology or migration. CCL2 expression correlated with the number of vessels, vessel perimeter and vessel area in PitNETs but not with PitNET-infiltrating macrophages. Our data suggest that CCL2 may lead to (or is at least a predictive marker of) poorer clinical outcomes and more difficult-to-treat PitNETs, potentially through its regulatory effects on different tumour-related mechanisms beyond immune cell chemotaxis, including in the activation of the EMT pathway and modulation of angiogenesis in PitNETs. Further studies are needed to corroborate our findings and to validate CCL2 as a potential predictive marker and therapeutic target in PitNETs.<\/jats:p>","DOI":"10.1530\/erc-24-0293","type":"journal-article","created":{"date-parts":[[2025,3,10]],"date-time":"2025-03-10T11:13:45Z","timestamp":1741605225000},"update-policy":"https:\/\/doi.org\/10.1530\/crossmarkpolicy-8","source":"Crossref","is-referenced-by-count":7,"title":["CCL2 expression predicts clinical outcomes and regulates E-cadherin and angiogenesis in pituitary tumours"],"prefix":"10.1530","volume":"32","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4839-8279","authenticated-orcid":true,"given":"Ana Lu\u00edsa","family":"Silva","sequence":"first","affiliation":[{"name":"Faculdade de Medicina, Universidade Cat\u00f3lica Portuguesa 1 , ,","place":["Lisbon, Portugal"]},{"name":"Instituto de Sa\u00fade Ambiental da Faculdade de Medicina da Universidade de Lisboa (ISAMB-FMUL) 2 , ,","place":["Lisbon, 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