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Updated: May 15, 2026

MAME Models for 4D Live-cell Imaging of Tumor: Microenvironment Interactions that Impact Malignant Progression

MAME Models for 4D Live-cell Imaging of Tumor: Microenvironment Interactions that Impact Malignant Progression

Published on: February 17, 2012

Acidity generated by the tumor microenvironment drives local invasion.

Veronica Estrella¹, Tingan Chen, Mark Lloyd

¹Departments of Cancer Imaging and Metabolism, Radiology, and Analytic Microscopy Laboratory, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL 33612, USA.

Cancer Research

|January 5, 2013

Summary

Tumor acidity promotes cancer invasion. Researchers found that acidic tumor environments correlate with increased invasion, and neutralizing this acidity with sodium bicarbonate inhibited tumor growth and spread in preclinical models.

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Area of Science:

Oncology
Cancer Biology
Tumor Microenvironment

Background:

Solid tumors often exhibit acidic extracellular pH due to increased fermentative metabolism and poor perfusion.
This acidic tumor microenvironment is hypothesized to promote local invasion and metastasis.
The acid-mediated invasion hypothesis suggests protons (H+) diffuse into adjacent tissues, causing remodeling that facilitates invasion.

Purpose of the Study:

To investigate the relationship between peritumoral pH and tumor invasion over time.
To determine if acidic tumor microenvironments directly correlate with invasive growth.
To evaluate the therapeutic potential of targeting tumor acidity.

Main Methods:

Intravital microscopy was used to monitor tumor invasion and peritumoral pH dynamics.
Immunohistochemical analyses identified markers associated with invasive cells and acidosis.
A preclinical model was used to assess the effects of sodium bicarbonate administration.

Main Results:

Peritumoral pH was consistently acidic and heterogeneous across tumors.
Regions of highest tumor invasion corresponded precisely to areas of lowest pH.
Tumor invasion was significantly inhibited in regions with normal or near-normal pH.
Invasive edge cells expressed glucose transporter-1 and sodium-hydrogen exchanger-1, linked to acidosis.
Oral sodium bicarbonate increased peritumoral pH, inhibiting tumor growth and local invasion.

Conclusions:

The study provides direct evidence supporting the acid-mediated invasion hypothesis.
Tumor acidity is a critical factor driving local invasion and metastasis.
Targeting tumor acidosis, for example with sodium bicarbonate, represents a viable therapeutic strategy.