Noninternalizing Fluorescent Probe Targeting Mas-Related G Protein Coupled Receptor X2: A Tool for Antagonist...

Area of Science:

• Immunology
• Biochemistry
• Pharmacology

Background:

• MrgX2 is a key target in allergic diseases.
• Current MrgX2 fluorescent probes face limitations due to receptor internalization, affecting accuracy and stability.
• Development of non-internalizing probes is crucial for advancing MrgX2 research.

Purpose of the Study:

• To develop a novel, non-internalizing fluorescent probe for MrgX2.
• To utilize the probe for screening MrgX2 antagonists and assessing diagnostic potential.
• To advance the study and treatment of MrgX2-mediated allergic diseases.

Main Methods:

• Synthesis and characterization of TM2, a non-internalizing fluorescent probe for MrgX2.
• Application of TM2 in live-cell imaging for stable and precise MrgX2 labeling.
• Development of a competitive binding assay using TM2 to screen compounds.
• In vitro and in vivo validation of identified MrgX2 antagonists.
• Quantitative analysis of MrgX2 expression in patient blood samples.

Main Results:

• TM2 demonstrated high specificity, favorable fluorescent properties, and enabled stable, precise MrgX2 labeling without inducing internalization or activation.
• A screening assay using TM2 identified C104 as a potent MrgX2 antagonist with validated antiallergic efficacy.
• TM2 successfully differentiated MrgX2 expression in blood samples from atopic dermatitis patients and healthy controls.
• The probe shows potential for diagnosing MrgX2-mediated allergic diseases.

Conclusions:

• TM2 is a versatile, non-internalizing fluorescent probe for MrgX2.
• This probe facilitates the discovery of MrgX2 antagonists and aids in allergy treatment development.
• TM2 holds diagnostic potential for MrgX2-related allergic conditions.
• The findings pave the way for improved diagnosis and treatment strategies for MrgX2-mediated diseases.