Inflammation Triggers Zeb1-Dependent Escape from Tumor Latency

Area of Science:

• Oncology
• Cell Biology
• Cancer Metastasis

Background:

• Metastatic disease recurrence years after primary tumor treatment is common but poorly understood.
• Mechanisms enabling disseminated tumor cells to escape cancer dormancy are largely unknown.
• Existing research focuses on dormancy maintenance, not escape.

Purpose of the Study:

• To investigate the mechanisms of disseminated tumor cell (DTC) escape from dormancy.
• To establish and utilize an in vivo model of solitary metastatic latency.
• To identify key molecular regulators involved in the transition from latent to active metastatic state.

Main Methods:

• Development of an in vivo model of solitary metastatic latency in mouse lung parenchyma.
• Induction of localized lung inflammation using lipopolysaccharide (LPS) treatment.
• Analysis of gene expression, focusing on epithelial-to-mesenchymal transition (EMT) regulators like Zeb1.

Main Results:

• Localized lung inflammation (LPS treatment) triggered the awakening of latent DTCs, leading to macroscopic metastases.
• Escape from latency was critically dependent on the expression of Zeb1, a key EMT regulator.
• Zeb1-mediated activation of the EMT program was sufficient to induce metastatic outgrowth and establish a metastasis-initiating cell state.

Conclusions:

• Localized inflammation can serve as a trigger for DTCs to escape dormancy and initiate metastatic growth.
• Zeb1-driven epithelial-to-mesenchymal transition is a crucial mechanism for overcoming cancer dormancy.
• Targeting Zeb1 or the EMT pathway may offer strategies to prevent or treat late metastatic recurrence.