Peptides binding to the hunger hormone ghrelin

Area of Science:

• Biochemistry
• Pharmacology
• Molecular Biology

Background:

• Ghrelin is the primary peripheral orexigenic hormone, making its neutralization a potential obesity treatment strategy.
• Developing effective pharmacological interventions for obesity requires identifying molecules that can specifically target ghrelin.

Purpose of the Study:

• To identify and select peptides with high affinity for ghrelin using phage display technology.
• To evaluate the specificity and binding characteristics of selected peptides for potential therapeutic development.

Main Methods:

• Utilized random peptide phage display libraries (Ph.D.-7 and Ph.D.-12) for four selection procedures.
• Employed a stepwise elimination approach to remove non-specific binders and analyzed remaining clones via ELISA.
• Investigated binding properties, including specificity and interaction with ghrelin's N-terminal octanoyl group.

Main Results:

• Identified four phage-displayed peptides exhibiting moderate affinity for ghrelin.
• Peptides ADTVPRH and MEMKKTHPVLGA demonstrated the highest specificity among the selected binders.
• Peptide MEMKKTHPVLGA showed potential binding to the N-terminal octanoyl group crucial for ghrelin's receptor interaction.

Conclusions:

• Phage display is effective in identifying ghrelin-binding peptides.
• Peptide MEMKKTHPVLGA is a promising lead candidate for further investigation in the development of anti-obesity therapeutics.
• Targeting ghrelin, particularly its octanoylated form, represents a viable strategy for obesity pharmacotherapy.