A Unidirectional Transition from Migratory to Perivascular Macrophage Is Required for Tumor Cell Intravasation
Overview
Cell Biology
Molecular Biology
Authors
Affiliations
Tumor-associated macrophages (TAMs) are critical for tumor metastasis. Two TAM subsets support cancer cell intravasation: migratory macrophages guide cancer cells toward blood vessels, where sessile perivascular macrophages assist their entry into the blood. However, little is known about the inter-relationship between these functionally distinct TAMs or their possible inter-conversion. We show that motile, streaming TAMs are newly arrived monocytes, recruited via CCR2 signaling, that then differentiate into the sessile perivascular macrophages. This unidirectional process is regulated by CXCL12 and CXCR4. Cancer cells induce TGF-β-dependent upregulation of CXCR4 in monocytes, while CXCL12 expressed by perivascular fibroblasts attracts these motile TAMs toward the blood vessels, bringing motile cancer cells with them. Once on the blood vessel, the migratory TAMs differentiate into perivascular macrophages, promoting vascular leakiness and intravasation.
Invasion and metastasis in cancer: molecular insights and therapeutic targets.
Li Y, Liu F, Cai Q, Deng L, OuYang Q, Zhang X Signal Transduct Target Ther. 2025; 10(1):57.
PMID: 39979279 PMC: 11842613. DOI: 10.1038/s41392-025-02148-4.
Immune Microenvironment in Breast Cancer Metastasis.
Qian B, Ma R Adv Exp Med Biol. 2025; 1464():413-432.
PMID: 39821036 DOI: 10.1007/978-3-031-70875-6_20.
The Roles of Myeloid Cells in Breast Cancer Progression.
Rivas C, Liu F, Zhang X Adv Exp Med Biol. 2025; 1464():397-412.
PMID: 39821035 DOI: 10.1007/978-3-031-70875-6_19.
The Microenvironment in DCIS and Its Role in Disease Progression.
Roozitalab M, Prekete N, Allen M, Grose R, Jones J Adv Exp Med Biol. 2025; 1464():211-235.
PMID: 39821028 DOI: 10.1007/978-3-031-70875-6_12.
FAM20C: A key protein kinase in multiple diseases.
Zhang R, Ren Y, Ju Y, Zhang Y, Zhang Y, Wang Y Genes Dis. 2025; 12(2):101179.
PMID: 39790934 PMC: 11714710. DOI: 10.1016/j.gendis.2023.101179.