{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,1]],"date-time":"2026-10-01T20:22:51Z","timestamp":1790886171665,"version":"4.1.0"},"reference-count":216,"publisher":"MDPI AG","issue":"13","license":[{"start":{"date-parts":[[2026,7,3]],"date-time":"2026-07-03T00:00:00Z","timestamp":1783036800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["IJMS"],"abstract":"<jats:p>Bone metastasis develops within a specialized marrow ecosystem where hematopoiesis, immune regulation, vascular trafficking, and skeletal remodeling intersect. Neutrophil-lineage cells occupy a unique position in this setting because they are generated, retained, mobilized, aged, and reprogrammed within the same bone marrow niches that disseminated tumor cells exploit for homing and survival. This review examines how neutrophils, tumor-associated neutrophils, immature neutrophils, low-density neutrophils, and PMN-MDSCs shape skeletal colonization. We discuss tumor-to-marrow signaling, CXCR2-dependent recruitment, CXCR4\/CXCL12-mediated marrow retention, neutrophil\u2013circulating tumor cell interactions, vascular arrest, dormancy escape, NET-mediated matrix remodeling, immune suppression, and effects on osteoclast\u2013osteoblast coupling. Evidence is strongest in breast and prostate cancer models, where pathways such as CXCL5\/CXCR2, CTNND1\u2013CXCR4\/CXCL12, PR3\u2013RAGE, and DKK1\u2013CKAP4\u2013STAT6\u2013CHI3L3 link neutrophil-lineage cells to skeletal progression and immunotherapy resistance. However, several mechanisms, including CTC\u2013neutrophil clustering and NET-driven dormancy awakening, remain partly extrapolated from non-skeletal models. We therefore emphasize evidence hierarchy, methodological limitations, and therapeutic opportunities, arguing that selective reprogramming or functional inhibition of pro-metastatic neutrophil states may be more promising than indiscriminate neutrophil depletion in metastatic bone disease. A clearer understanding of these context-dependent neutrophil programs may help refine biomarker development and guide combination therapies for patients with skeletal metastases.<\/jats:p>","DOI":"10.3390\/ijms27135975","type":"journal-article","created":{"date-parts":[[2026,7,3]],"date-time":"2026-07-03T07:59:47Z","timestamp":1783065587000},"page":"5975","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["From Bone Marrow Reserve to Metastatic Niche: How Neutrophil-Lineage Cells Shape Skeletal Colonization"],"prefix":"10.3390","volume":"27","author":[{"ORCID":"https:\/\/orcid.org\/0009-0002-5625-3683","authenticated-orcid":false,"given":"Fatheia N.","family":"Hamza","sequence":"first","affiliation":[{"name":"Department of Biochemistry and Molecular Medicine, College of Medicine, Alfaisal University, Riyadh 11533, Saudi Arabia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5067-4984","authenticated-orcid":false,"given":"Mahmoud","family":"Zhra","sequence":"additional","affiliation":[{"name":"Department of Anatomy, College of Medicine, Alfaisal University, Riyadh 11533, Saudi Arabia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7743-6740","authenticated-orcid":false,"given":"Jasmine","family":"Holail","sequence":"additional","affiliation":[{"name":"Department of Biochemistry and Molecular Medicine, College of Medicine, Alfaisal University, Riyadh 11533, Saudi Arabia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0001-1821-7983","authenticated-orcid":false,"given":"Samaa","family":"Alotab","sequence":"additional","affiliation":[{"name":"Department of Biochemistry and Molecular Medicine, College of Medicine, Alfaisal University, Riyadh 11533, Saudi Arabia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0006-7361-6895","authenticated-orcid":false,"given":"Sidra","family":"Alshater","sequence":"additional","affiliation":[{"name":"Department of Anatomy, College of Medicine, Alfaisal University, Riyadh 11533, Saudi Arabia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0758-9818","authenticated-orcid":false,"given":"Alaa A.","family":"Al-Masud","sequence":"additional","affiliation":[{"name":"Tissue Biobank Section, Research Department, Natural and Health Science Research Center, Princess Nourah Bint Abdulrahman University, P.O. Box 84428, Riyadh 11671, Saudi Arabia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0006-9708-2111","authenticated-orcid":false,"given":"Khalid Said","family":"Mohammad","sequence":"additional","affiliation":[{"name":"Department of Anatomy, College of Medicine, Alfaisal University, Riyadh 11533, Saudi Arabia"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,7,3]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"117328","DOI":"10.1016\/j.bone.2024.117328","article-title":"Immune microenvironment of cancer bone metastasis","volume":"191","author":"Hiraga","year":"2025","journal-title":"Bone"},{"key":"ref_2","doi-asserted-by":"crossref","unstructured":"He, N., and Jiang, J. (2022). Contribution of immune cells to bone metastasis pathogenesis. Front. 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