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Inhibition of Notch4 with Novel Neutralizing Antibodies Reduces Tumor Growth in Multiple Tumor Types and Targets Endothelium and Tumor Associated Macrophages in a Mouse Breast Cancer Model

ABSTRACT: Inhibition of Notch4 with Novel Neutralizing Antibodies Reduces Tumor Growth in Multiple Tumor Types and Targets Endothelium and Tumor Associated Macrophages in a Mouse Breast Cancer Model

PROVIDER: PRJNA1009012 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR25585012_1.fastq.gz	Fastqsanger.gz
	SRR25585012_2.fastq.gz	Fastqsanger.gz
	SRR25585013_1.fastq.gz	Fastqsanger.gz
	SRR25585013_2.fastq.gz	Fastqsanger.gz
	SRR25585014_1.fastq.gz	Fastqsanger.gz

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Inhibition of Notch4 with Novel Neutralizing Antibodies Reduces Tumor Growth in Multiple Tumor Types and Targets Endothelium and Tumor Associated Macrophages in a Mouse Breast Cancer Model [scRNA-seq]

Project description:Endothelial Notch signaling is critical for tumor angiogenesis. Notch1 blockade reduces tumor vessel function but causes vascular dysfunction, hypoxia, and gastrointestinal toxicity. Notch4 expression is restricted to developing vasculature, where it promotes angiogenesis. Unlike other Notch proteins, Notch4 has rarely been targeted therapeutically. We developed highly specific Notch4-blocking antibodies, 6-3-A6 and humanized E7011, allowing therapeutic targeting of Notch4 in tumor models. E7011 treatment significantly delayed tumor growth and impaired tumor vessel perfusion in mouse models of breast, skin, and lung tumors. In a mouse orthotopic breast cancer model, Notch4 expression was confined to endothelial cells, but E7011 treatment significantly increased tumor-associated macrophages and increased macrophage expression of anti-tumor genes. Liposomal clodronate-mediated macrophage depletion reversed the anti-tumor effects of E7011, demonstrating that Notch4 supports tumor growth via angiocrine signaling to tumor macrophages. We conclude that targeting Notch4 alters tumor vessel function and tumor associated macrophage phenotype, leading to tumor inhibition.

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Project description:Inhibition of Notch4 with Novel Neutralizing Antibodies Reduces Tumor Growth in Multiple Tumor Types and Targets Endothelium and Tumor Associated Macrophages in a Mouse Breast Cancer Model [scRNA-seq]

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Inhibition of Notch4 Using Novel Neutralizing Antibodies Reduces Tumor Growth in Murine Cancer Models by Targeting the Tumor Endothelium.

Project description:Endothelial Notch signaling is critical for tumor angiogenesis. Notch1 blockade can interfere with tumor vessel function but causes tissue hypoxia and gastrointestinal toxicity. Notch4 is primarily expressed in endothelial cells, where it may promote angiogenesis; however, effective therapeutic targeting of Notch4 has not been successful. We developed highly specific Notch4-blocking antibodies, 6-3-A6 and humanized E7011, allowing therapeutic targeting of Notch4 to be assessed in tumor models. Notch4 was expressed in tumor endothelial cells in multiple cancer models, and endothelial expression was associated with response to E7011/6-3-A6. Anti-Notch4 treatment significantly delayed tumor growth in mouse models of breast, skin, and lung cancers. Enhanced tumor inhibition occurred when anti-Notch4 treatment was used in combination with chemotherapeutics. Endothelial transcriptomic analysis of murine breast tumors treated with 6-3-A6 identified significant changes in pathways of vascular function but caused only modest change in canonical Notch signaling. Analysis of early and late treatment timepoints revealed significant differences in vessel area and perfusion in response to anti-Notch4 treatment. We conclude that targeting Notch4 improves tumor growth control through endothelial intrinsic mechanisms.SignificanceA first-in-class anti-Notch4 agent, E7011, demonstrates strong antitumor effects in murine tumor models including breast carcinoma. Endothelial Notch4 blockade reduces perfusion and vessel area.

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