LvID-BDP: A Conotoxin-Based Fluorescent Probe for Visualizing α7 nAChR Expression in Intestinal Inflammation

Area of Science:

• Neuroscience
• Pharmacology
• Immunology

Background:

• The alpha-7 nicotinic acetylcholine receptor (α7 nAChR) plays a role in neuroimmune signaling.
• Its function in peripheral diseases is poorly understood due to a lack of effective visualization tools.

Purpose of the Study:

• To develop and characterize a novel fluorescent probe for visualizing α7 nAChR in peripheral tissues.
• To assess the probe's utility in studying α7 nAChR expression in disease models.

Main Methods:

• Conjugation of a BODIPY fluorophore to the α7 nAChR-targeting peptide LvID to create the LvID-BDP probe.
• Electrophysiological characterization of LvID-BDP's affinity and inhibitory concentration (IC50).
• Application of LvID-BDP in murine colon sections and macrophage models, including those with inflammatory bowel disease (IBD).

Main Results:

• LvID-BDP demonstrated high quantum yield, photostability, and physiological stability.
• Electrophysiology confirmed LvID-BDP as a potent α7 nAChR antagonist with high affinity and specificity (IC50 = 119.2 nM).
• The probe specifically labeled α7 nAChR in murine colon, showing enrichment in macrophages and detecting alterations in IBD models.

Conclusions:

• LvID-BDP is a valuable tool for specific α7 nAChR visualization in peripheral disease contexts.
• This probe facilitates research into the pathological mechanisms of neuroimmune modulation in diseases like IBD.