{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,28]],"date-time":"2026-07-28T11:18:53Z","timestamp":1785237533915,"version":"3.55.0"},"reference-count":58,"publisher":"Frontiers Media SA","license":[{"start":{"date-parts":[[2026,5,20]],"date-time":"2026-05-20T00:00:00Z","timestamp":1779235200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["frontiersin.org"],"crossmark-restriction":true},"short-container-title":["Front. Endocrinol."],"abstract":"<jats:sec>\n                    <jats:title>Introduction<\/jats:title>\n                    <jats:p>The insulin-like growth factor (IGF-1\/IGF1R) pathway has been implicated in breast cancer aggressiveness; however, inhibition of this pathway has not been successful in clinical trials, indicating a lack of understanding about its role in TNBC metastasis. Recent studies have explored IGF1R involvement in integrin function and cancer cell adhesion dynamics. The goal of this study was to test the hypothesis that IGF1R itself regulates cancer cell adhesion.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>We use MDA-MB-231, Hs578T, BT-549 and MCF7 breast cancer cell lines, siRNA-mediated knockdown, and adhesion assays to assess how IGF1R and integrin knockdowns impact cancer cell adhesion. Using xCELLigence E-plates, we quantify the effect of IGF-1 ligand stimulation versus IGF1R knockdown on functional cell adhesion. We also use HUVEC human endothelial cells to determine how IGF1R regulates adhesion to the endothelium.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>We found that IGF-1 stimulation increased MDA-MB-231 TNBC adhesion, which was reversed by the IGF1R tyrosine kinase inhibitor BMS-754807 and the ligand-dependent receptor internalization inhibitor dansylcadaverine. Unexpectedly, IGF1R knockdown also potently stimulated cell adhesion. Concomitant \u03b21 integrin knockdown reversed the increased cell adhesion after both IGF-1 stimulation or IGF1R knockdown, indicating that the increased adhesion is \u03b21 integrin dependent. This was also seen via immunocytochemistry when cells were seeded on fibronectin. Finally, inhibiting IGF1R signaling also reduced MDA-MB-231 cell adhesion to HUVEC endothelial cells.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Discussion<\/jats:title>\n                    <jats:p>Both IGF-1 stimulation and IGF1R knockdown in TNBC cells promote cell adhesion, which seems paradoxical. However, the commonality of both interventions is removal of IGF1R from the cell surface, since IGF-1 stimulation causes IGF1R internalization and intracellular trafficking. Blocking IGF1R activation using a tyrosine kinase inhibitor preserves IGF1R on the cell surface. Thus, we propose a model whereby surface-bound IGF1R inhibits \u03b21 integrin function and blocks cell adhesion. This model is supported further by our finding that treatment of MDA-MB-231 cells with dansylcadaverine, which inhibits ligand-mediated receptor internalization, blocked the effect of IGF-1 on adhesion. These findings further elucidate IGF1R function during breast cancer metastasis by modulating cell adherence.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.3389\/fendo.2026.1701560","type":"journal-article","created":{"date-parts":[[2026,5,20]],"date-time":"2026-05-20T04:37:04Z","timestamp":1779251824000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":1,"title":["Insulin-like growth factor 1 receptor regulates breast cancer cell adhesion through beta-1 integrin"],"prefix":"10.3389","volume":"17","author":[{"given":"Christopher A.","family":"Galifi","sequence":"first","affiliation":[{"name":"Department of Pharmacology, Physiology, & Neuroscience, Center for Cell Signaling and Cancer Institute of New Jersey, New Jersey Medical School, Rutgers Health","place":["Newark, NJ, United 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Medical School, Rutgers Health","place":["Newark, NJ, United States"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Utz","family":"Herbig","sequence":"additional","affiliation":[{"name":"Department of Pharmacology, Physiology, & Neuroscience, Center for Cell Signaling and Cancer Institute of New Jersey, New Jersey Medical School, Rutgers Health","place":["Newark, NJ, United States"]},{"name":"Department of Microbiology, Biochemistry & Molecular Genetics, Center for Cell Signaling, New Jersey Medical School, Rutgers Health","place":["Newark, NJ, United States"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Amir K.","family":"Miri","sequence":"additional","affiliation":[{"name":"Department of Biomedical Engineering, Newark College of Engineering, New Jersey Institute of Technology","place":["Newark, NJ, United States"]},{"name":"Department of Mechanical and Industrial Engineering, Newark College of Engineering, New Jersey Institute of 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