Proton Sensing GPCR's: The missing link to Warburg's Oncogenic Legacy?

Area of Science:

• Cancer Biology
• Metabolic Reprogramming
• Molecular Signaling

Background:

• The Warburg effect, enhanced glycolysis producing lactate even with oxygen, is a hallmark of cancer, but its persistence despite inefficient ATP production is unclear.
• The acidic tumor microenvironment resulting from lactate accumulation promotes cancer progression, therapeutic resistance, and immune evasion.

Purpose of the Study:

• To propose proton-sensing G-protein-coupled receptors (GPCRs) as mediators linking the Warburg effect to oncogenic signaling.
• To elucidate the mechanism by which extracellular acidity activates GPCRs and drives cancer phenotypes.

Main Methods:

• Review of existing literature on the Warburg effect, tumor microenvironment, and GPCR signaling.
• Hypothesizing the role of proton-sensing GPCRs, such as GPR68, in transducing acidic signals.

Main Results:

• Protonation of key residues in GPCRs like GPR68 activates downstream pathways (MAPK, PI3K/Akt, Rho, β-arrestin).
• This activation promotes cancer cell proliferation, migration, survival, and therapeutic resistance.

Conclusions:

• Proton-sensing GPCRs provide a mechanistic link between the Warburg effect and oncogenic signaling, explaining the metabolic paradox.
• Targeting these GPCRs could disrupt the synergy between altered cancer metabolism and tumor progression, offering novel therapeutic strategies.