John Condeelis, Jeffrey W. Pollard  Cell 

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Macrophages: Obligate Partners for Tumor Cell Migration, Invasion, and Metastasis  John Condeelis, Jeffrey W. Pollard  Cell  Volume 124, Issue 2, Pages 263-266 (January 2006) DOI: 10.1016/j.cell.2006.01.007 Copyright © 2006 Elsevier Inc. Terms and Conditions

Figure 1 Tumor Cells Co-opt Macrophage Functions Macrophages aid in the invasion of epithelial cells during morphogenesis (left) and are co-opted by tumor cells during metastasis (right). Multiphoton image at the bottom left: epithelial cells (blue) of a terminal end bud in a mouse mammary gland during normal glandular development. The bud is surrounded by macrophages (red) that precede the invasion of the fat pad by the epithelial cells. Multiphoton image at the bottom right: tumor-associated macrophages (red) and tumor cells (green) at an invasive edge in a mouse mammary tumor. Adapted from Wyckoff et al. (2004) and Lin et al. (2002). Cell 2006 124, 263-266DOI: (10.1016/j.cell.2006.01.007) Copyright © 2006 Elsevier Inc. Terms and Conditions

Figure 2 Six Traits for Malignancy Promoted by Macrophages Tumors direct macrophages to adopt a trophic role that facilitates six traits that are extrinsic to the intrinsic genetic changes of tumor cells. The wheel (in deference to Hanahan and Weinberg, 2000) can turn in either direction, allowing macrophages to contribute to invasion, intravasation, angiogenesis, and extravasation equally. The image in the center is a multiphoton micrograph of a mammary tumor (green) and associated macrophages (red) in a living mouse. Cell 2006 124, 263-266DOI: (10.1016/j.cell.2006.01.007) Copyright © 2006 Elsevier Inc. Terms and Conditions

Figure 3 Macrophages Play a Direct Role in the Invasion and Intravasation of Mammary Tumor Cells Macrophages are involved in a paracrine loop with tumor cells during the initial stages of metastasis. Carcinoma cells of metastatic tumors exhibit high-velocity polarized movement along collagen fibers toward blood vessels as a result of chemotaxis. Chemotaxis to the blood vessel occurs in response to chemoattractants such as EGF secreted by macrophages associated with the vessels. Cancer cells express the EGF receptor (EGFR) and secrete CSF-1, which attracts macrophages and induces them to express EGF, thereby completing the paracrine loop. Collagen-containing fibers support tumor-associated vessels like a spider web with the vessel at the center. The convergence of these fibers on vessels has the effect of directing macrophage-induced tumor cell movement to the vessels. (Adapted from Lin et al., 2002; Condeelis and Segall, 2003.) Inset: signaling between the macrophage and the tumor cell affects the activity of actin regulators such as WASP and N-WASP, resulting in the formation of podosomes in macrophages and invadopodia in tumor cells to promote tumor cell intravasation. Cell 2006 124, 263-266DOI: (10.1016/j.cell.2006.01.007) Copyright © 2006 Elsevier Inc. Terms and Conditions