T Cells Promote Metastasis by Regulating Extracellular Matrix Remodeling following Chemotherapy

Area of Science:

• Immunology
• Oncology
• Biochemistry

Background:

• Metastasis is a primary driver of cancer mortality, and current treatments remain challenging.
• Understanding the mechanisms of metastasis is crucial for developing effective therapies.

Purpose of the Study:

• To investigate a chemotherapy-induced mechanism that promotes cancer metastasis through extracellular matrix (ECM) remodeling.
• To identify the role of immune cells and specific enzymes in this process.

Main Methods:

• Utilized paclitaxel (PTX) chemotherapy in mice to study ECM remodeling and lysyl oxidase (LOX) activity.
• Employed chimeric mice with genetic LOX depletion and adoptive T cell transfer experiments.
• Tested LOX inhibition in a preclinical breast carcinoma metastasis model.

Main Results:

• Paclitaxel chemotherapy induced rapid ECM remodeling and increased LOX expression and activity in mouse lungs.
• Chemotherapy-induced ECM remodeling was mediated by CD8+ T cells expressing LOX.
• Inhibition of LOX counteracted PTX-induced metastasis-promoting effects in a breast cancer model.

Conclusions:

• Chemotherapy can induce a prometastatic ECM remodeling process mediated by T cell-derived LOX.
• Targeting chemotherapy-induced ECM remodeling with LOX inhibitors presents a potential therapeutic strategy to suppress metastasis.