Aquaporin Inhibitors.

Area of Science:

• Biochemistry and Molecular Biology
• Pharmacology
• Physiology

Background:

• Aquaporins (AQPs) are crucial membrane channels regulating water transport and physiological processes like cell migration and inflammation.
• AQPs are significant drug targets, yet their 'undruggable' properties pose challenges for inhibitor discovery.
• Dysregulation of AQPs is implicated in various diseases, necessitating effective therapeutic interventions.

Purpose of the Study:

• To review current methodologies for screening aquaporin inhibitors.
• To discuss existing classes of aquaporin inhibitors and their limitations.
• To highlight the challenges and potential impact of discovering novel AQP inhibitors.

Main Methods:

• Cell-based assays: cell swelling and cell shrinking assays.
• Biophysical techniques: stopped-flow assay.
• Literature review of identified AQP inhibitor classes.

Main Results:

• Common screening methods include cell swelling, cell shrinking, and stopped-flow assays.
• Discussed inhibitor classes include metal-related compounds, quaternary ammonium salts, and various small molecules (e.g., sulfanilamide analogs, TGN-020, antiepileptic drugs).
• Existing inhibitors show varied effects on AQP1, AQP3, AQP4, AQP7, and AQP9, but none are definitively established as potent AQP inhibitors.

Conclusions:

• Despite extensive research, definitive aquaporin inhibitors remain elusive.
• Developing effective AQP inhibitors presents a significant scientific challenge.
• Successful discovery of AQP inhibitors could offer substantial benefits for human health and disease treatment.