2-Cycloalkyl phenoxyacetic acid CRTh2 receptor antagonists

Area of Science:

• Medicinal Chemistry
• Pharmacology
• Immunology

Background:

• The chemoattractant receptor expressed on Th2 cells (CRTh2) is a key target in allergic inflammation.
• Developing selective CRTh2 antagonists is crucial for treating eosinophil-mediated diseases.

Purpose of the Study:

• To identify novel chemotypes targeting the CRTh2 receptor.
• To optimize lead compounds for potent CRTh2 antagonism and favorable pharmacokinetic properties.

Main Methods:

• High throughput screening (HTS) of a diverse chemical library to identify CRTh2 antagonists.
• In vitro assays to assess functional inhibition of human eosinophil shape change.
• In vivo pharmacokinetic studies in rats to evaluate oral bioavailability.

Main Results:

• A phenoxyacetic acid scaffold was identified as a novel CRTh2 antagonist chemotype.
• Optimization yielded a compound with significant functional potency against CRTh2.
• The optimized compound demonstrated good oral bioavailability in preclinical rat models.

Conclusions:

• The phenoxyacetic acid scaffold represents a promising starting point for developing new CRTh2-targeted therapeutics.
• The identified compound warrants further investigation for its potential in treating allergic inflammatory conditions.