GPR35 prevents osmotic stress induced cell damage

Area of Science:

• Cell Biology
• Molecular Biology
• Physiology

Background:

• G protein-coupled receptor 35 (GPR35) is an orphan receptor implicated in cancer development.
• GPR35 plays a role in regulating the Na+/K+-ATPase pump and its signaling.
• Understanding GPR35's function is crucial for its potential therapeutic targeting.

Purpose of the Study:

• To investigate the role of GPR35 in ion flux and cellular osmotic pressure regulation.
• To determine the impact of GPR35 deficiency and variants on cellular transport and homeostasis.
• To explore the link between GPR35, diet, and intestinal epithelial cell characteristics.

Main Methods:

• Utilized HepG2 and SW480 cell lines to study GPR35 function.
• Assessed intracellular Na+ levels, osmotic pressure, and glutamine import.
• Examined the effects of a high salt diet in wildtype mice and compared them to Gpr35-/- littermates.

Main Results:

• GPR35 deficiency leads to increased intracellular Na+, osmotic stress, larger cell size, and reduced glutamine uptake.
• The GPR35-T108M variant results in lower intracellular Na+ and enhanced glutamine uptake.
• High salt diet in wildtype mice mimics the intestinal phenotype of Gpr35-/- mice, with reduced goblet cells.

Conclusions:

• GPR35 critically regulates ion flux, cellular osmotic pressure, and Na+-dependent transport.
• GPR35 dysfunction affects cellular homeostasis and nutrient import, with implications for disease.
• GPR35's control over the Na+/K+-ATPase is vital for maintaining ion balance and transporter function.