Abstract:
:Tumor-associated macrophages (TAMs) invade the tumor stroma in many cancers, yet their role is incompletely understood. To visualize and better understand these critical cells in tumor progression, we screened a portfolio of rationally selected, injectable agents to image endogenous TAMs ubiquitously in three different cancer models (colon carcinoma, lung adenocarcinoma, and soft tissue sarcoma). AMTA680, a functionally derivatized magneto-fluorescent nanoparticle, labeled a subset of myeloid cells with an "M2" macrophage phenotype, whereas other neighboring cells, including tumor cells and a variety of other leukocytes, remained unlabeled. We further show that AMTA680-labeled endogenous TAMs are not altered and can be tracked noninvasively at different resolutions and using various imaging modalities, e.g., fluorescence molecular tomography, magnetic resonance imaging, and multiphoton and confocal intravital microscopy. Quantitative assessment of TAM distribution and activity in vivo identified that these cells cluster in delimited foci within tumors, show relatively low motility, and extend cytoplasmic protrusions for prolonged physical interactions with neighboring tumor cells. Noninvasive imaging can also be used to monitor TAM-depleting regimen quantitatively. Thus, AMTA680 or related cell-targeting agents represent appropriate injectable vehicles for in vivo analysis of the tumor microenvironment.
journal_name
Neoplasiajournal_title
Neoplasia (New York, N.Y.)authors
Leimgruber A,Berger C,Cortez-Retamozo V,Etzrodt M,Newton AP,Waterman P,Figueiredo JL,Kohler RH,Elpek N,Mempel TR,Swirski FK,Nahrendorf M,Weissleder R,Pittet MJdoi
10.1593/neo.09356subject
Has Abstractpub_date
2009-05-01 00:00:00pages
459-68, 2 p following 468issue
5eissn
1522-8002issn
1476-5586journal_volume
11pub_type
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