Assessing Na⁺/H⁺ exchange and cell effector functionality in metastatic breast cancer

Area of Science:

• Oncology
• Cell Biology
• Biochemistry

Background:

• Metastasis is the primary cause of cancer mortality, particularly in aggressive triple-negative breast cancer (TNBC).
• The Na+/H+ exchanger isoform 1 (NHE1) is crucial for TNBC cell invasiveness and metastasis.
• NHE1 activity alters intracellular pH and extracellular pH, influencing the tumor microenvironment.

Purpose of the Study:

• To describe novel assays for characterizing NHE1 activity in TNBC cells.
• To evaluate the downstream physiological effects of NHE1 activation on cancer cell behavior.
• To provide tools for testing therapeutic strategies targeting NHE1 to inhibit metastasis.

Main Methods:

• Fluorometric assay to measure real-time intracellular pH changes reflecting NHE1 activity.
• Wound-healing assays to assess directed cell migration rates.
• Transwell invasion assays (short-term and 3D) to evaluate cell invasion through extracellular matrix and scaffolds.

Main Results:

• Established assays accurately measure NHE1 activity and its impact on TNBC cell migration and invasion.
• Demonstrated the utility of these assays in evaluating the effects of chemical inhibition of NHE1.
• Provided a comprehensive toolkit for studying NHE1's role in breast cancer metastasis.

Conclusions:

• The developed assays are effective tools for assessing NHE1 activity and its functional consequences in TNBC.
• These methods facilitate the investigation of NHE1 inhibitors as a potential therapeutic strategy against breast cancer metastasis.
• Understanding NHE1's role is critical for developing new treatments for aggressive breast cancers.