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Updated: May 5, 2026
Colorectal Cancer Cell Surface Protein Profiling Using an Antibody Microarray and Fluorescence Multiplexing
Published on: September 25, 2011
CD169+ macrophages identify and eliminate tumor cells in colorectal cancer through CD169/CD43 interaction and
Junqing Hu1, Feilong Guo2, Congwei Han3
1State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University, Nanjing, Jiangsu 210023, China; NJU Xishan Institute of Applied Biotechnology, Xishan District, Wuxi, Jiangsu 214101, China.
Abstract:
Tumor-associated macrophages (TAMs) play key roles in tumor progression and therapy resistance. In colorectal cancer (CRC), TAM heterogeneity challenges macrophage-targeted therapies, with certain antitumor macrophage subpopulations not yet fully characterized. This study bridges this gap by identifying a distinct subset of tumoricidal CD169+ macrophages. Increased infiltration of CD169+ macrophages was observed in CRC tissues, which was significantly associated with improved overall survival in patients with CRC. Deleting CD169+ macrophages in genetically engineered mouse models (MC38 orthotopic/ectopic and CD169DTR/+ApcMin/+ intestinal adenoma) accelerated tumor growth. Integrated multi-omics data and functional assays, including cell coculture models and animal experiments with antibody blockade, reveal an antitumor mechanism in which CD169+ macrophages directly interact with CRC cells. This interaction, mediated by CD169/CD43 molecular engagements, leads to tumor cell apoptosis via high levels of factor-related apoptosis ligand (FasL). Our results not only deepen our understanding of the CRC tumor microenvironment but also open avenues for cancer immunotherapy targeting.
Insights
Researchers identified tumoricidal CD169+ macrophages in colorectal cancer (CRC). These macrophages improve patient survival and exhibit antitumor properties by inducing tumor cell apoptosis, offering new immunotherapy targets.
Area of Science:
- Immunology
- Oncology
- Molecular Biology
Background:
- Tumor-associated macrophages (TAMs) are crucial in cancer progression and treatment resistance.
- Colorectal cancer (CRC) presents challenges for macrophage-targeted therapies due to TAM heterogeneity.
- Antitumor macrophage subsets in CRC remain incompletely understood.
Purpose of the Study:
- To identify and characterize novel antitumor macrophage subsets in colorectal cancer.
- To elucidate the mechanisms by which these macrophages exert tumoricidal effects.
- To explore the therapeutic potential of targeting these macrophages in CRC.
Main Methods:
- Multi-omics data integration and functional assays.
- Analysis of CD169+ macrophage infiltration in CRC tissues.
- Genetic manipulation in mouse models (MC38 and CD169DTR/+ApcMin/+) to delete CD169+ macrophages.
- In vitro cell coculture models and in vivo antibody blockade experiments.
Main Results:
- A distinct subset of tumoricidal CD169+ macrophages was identified in CRC.
- Increased CD169+ macrophage infiltration correlated with improved patient survival.
- Deletion of CD169+ macrophages accelerated tumor growth in mouse models.
- CD169+ macrophages induce CRC cell apoptosis via CD169/CD43 engagement and FasL expression.
Conclusions:
- CD169+ macrophages represent a promising target for colorectal cancer immunotherapy.
- Understanding the CD169+ macrophage antitumor mechanism enhances knowledge of the CRC tumor microenvironment.
- Targeting CD169/CD43 interactions could be a novel therapeutic strategy for CRC.
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