Identification and Characterization of MUC5B Binding Peptides by Phage Display

Area of Science:

• Oral biology and biochemistry
• Biotechnology and peptide engineering
• Salivary diagnostics and therapeutics

Background:

• Mucin 5B (MUC5B) is crucial for maintaining oral health and salivary function.
• Decreased MUC5B production can lead to xerostomia (dry mouth).
• Phage display is a powerful tool for developing functional peptide libraries.

Purpose of the Study:

• To identify MUC5B-selective peptides using phage display.
• To evaluate the effect of identified peptides on salivary spinnbarkeit (stringiness) in situ.
• To assess the protective effect of these peptides against acid-induced demineralization in vitro.

Main Methods:

• Phage display was employed to select MUC5B-binding phages.
• Peptide affinity was assessed using MUC5B-coated hydroxyapatite granules.
• Salivary spinnbarkeit and acid resistance were tested with selected MUC5B-binding peptides (MBPs).
• Competitive ELISA was used for epitope mapping.

Main Results:

• MBP-12 and MBP-14 exhibited high affinity for MUC5B.
• MBP-12 demonstrated a mild stabilizing effect on the spinnbarkeit of both serous and mucous saliva.
• MBP-12 did not provide additional protection against acid-induced demineralization.
• The binding site for MBP-12 on MUC5B was identified as a galactose residue.

Conclusions:

• Phage display effectively generated MUC5B-binding peptides.
• MBPs, particularly MBP-12, showed a modest impact on salivary spinnbarkeit.
• These findings suggest potential applications for peptide libraries in developing xerostomia treatments.