Intratumoral pH Modulation via Buffer Administration
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Solution Overview
Problem
Cancer therapies face challenges in addressing the acidic extracellular pH (pHe) of tumors, which promotes invasive growth and metastasis while being toxic to normal cells, leading to limited effectiveness and side effects.
Innovation Solution
Administering non-volatile, non-toxic buffers with a pKa greater than 6.4, such as sodium bicarbonate or 2-imidazole-1-yl-3-ethoxycarbonylpropionic acid, to increase intratumoral extracellular pH, reducing acidosis and inhibiting malignant growth without affecting normal tissue pH.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional cancer therapies are used to treat tumors, then tumor growth is targeted, but the acidic extracellular pH promotes invasive growth and metastasis while being toxic to normal cells
Solution Approach 1:
The patent changes the pH parameter of the tumor microenvironment by administering systemic buffers (sodium bicarbonate, TRIS, HEPES) that specifically increase intratumoral extracellular pH from acidic levels (6.6-7.0) toward normal levels (7.2-7.4), thereby reducing acid-mediated invasion and metastasis while preserving normal tissue function
Solution Approach 2:
The patent introduces buffer substances as intermediaries that absorb excess protons in the tumor microenvironment. These buffers act as mediators between the tumor cells and the extracellular environment, neutralizing acidosis without directly killing tumor cells, thus reducing invasive behavior while maintaining normal cell viability
2Reliability
If systemic buffers are administered to increase intratumoral pHe, then tumor growth and invasion are reduced, but the buffer must be non-volatile and non-toxic to normal tissues
Solution Approach 1:
The patent exploits the local quality difference between tumor and normal tissue microenvironments. Tumor tissues have inherently lower pH due to Warburg effect and poor vasculature, while normal tissues maintain physiological pH. Systemic buffers selectively accumulate in the acidic tumor microenvironment where they are most needed, raising local pH without significantly affecting normal tissue pH levels, thus inhibiting malignant growth while minimizing toxicity to normal cells
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Significantly reduces tumor growth and invasion while being safe for normal tissues, offering a novel approach to cancer treatment by modulating the tumor microenvironment.
Implementation Method 1
Administering non-volatile, non-toxic buffers with a pKa greater than 6.4, such as sodium bicarbonate or 2-imidazole-1-yl-3-ethoxycarbonylpropionic acid, to increase intratumoral extracellular pH, reducing acidosis
Data Source
AI summary
A method of treating cancer or inhibiting metastasis in a subject by increasing intratumoral extracellular pH is presented. The method includes administering to the subject a therapeutically effective amount of a buffer having a pKa greater than 6.1. In an advantageous embodiment the pKa of the buffer is about 7.0. Examples of buffers for increasing extracellular pH include NaHCO3, 2-imidazole-1-yl-3-ethoxycarbonylpropionic acid (IEPA), cholamine chloride, N,N-Bis(2-hydroxyethyl)-2-aminoethanesulfonic acid (BES), N-Tris(hydroxymethyl)methyl-2-aminoethanesulfonic acid (TES) and 4-(2-Hydroxyethyl)piperazine-1-ethanesulfonic acid (HEPES). The method can further include the step of pretreating with one or more chemotherapeutic agents.