# Inflammasome Activation by Neutrophil Extracellular Traps (NETs) in the MDA-MB-231 Human Breast Cancer Cell Line

## TL;DR

This study explores how NETs from neutrophils activate the NLRP3 inflammasome in breast cancer cells, promoting inflammation and tumor progression.

## Contribution

The study reveals a novel interplay between NETs and the NLRP3 inflammasome in breast cancer progression.

## Key findings

- NETs increased NLRP3, CASP1, and IL1B expression in MDA-MB-231 cells.
- Inhibitors of IL-1R and P2X7 reduced IL1B and NLRP3 expression.
- NETs accelerated tumor migration, inhibited by inflammasome inhibitors.

## Abstract

Inflammation is a key feature in breast cancer progression, with neutrophil extracellular traps (NETs) playing an important role. NETs are DNA-based structures released by neutrophils that can promote tumor adhesion, invasion, and immune evasion. Another crucial mechanism is the inflammasome, a multiprotein complex that drives inflammation through cytokine release. Both mechanisms are present in tumors and may act synergistically. In this study, we evaluated how isolated NETs modulate the NLRP3 inflammasome in a human breast cancer model. Exposure of MDA-MB-231 cells to NETs increased the expression of NLRP3, CASP1, and IL1B. Blocking IL-1R with Anakinra reduced IL1B expression, while inhibition of the P2X7 receptor with A740003 decreased NLRP3 and IL1B. ELISA confirmed that NETs stimulate IL-1β release, which was reduced by MCC950, Anakinra, and A740003. Functionally, NETs accelerated tumor cell migration, and this effect was inhibited by MCC950 and Anakinra. Bioinformatics analysis of TCGA breast cancer samples showed differential inflammasome gene expression among subtypes and a positive correlation between inflammasome components and NET-related genes. These findings highlight the interplay between inflammatory and immune mechanisms in breast cancer progression and may support the development of new therapeutic strategies.