Flavonoids as Potential Modulators of Pancreatic Lipase Catalytic Activity

Area of Science:

• Biochemistry
• Pharmacology
• Medicinal Chemistry

Background:

• Obesity is a global health crisis, with pancreatic lipase (PL) identified as a key target for therapeutic intervention.
• Human pancreatic lipase (HPL) is crucial for dietary lipid absorption, making it a primary target for anti-obesity drugs.
• Porcine pancreatic lipase (PPL) is often used as a model, but its inhibitory responses may not fully translate to HPL.

Purpose of the Study:

• To screen a flavonoid library for inhibitory activity against human pancreatic lipase (HPL) and porcine pancreatic lipase (PPL).
• To establish structure-activity relationships (SAR) for flavonoid inhibition of HPL.
• To compare inhibitory mechanisms between PPL and HPL and validate findings through in silico studies.

Main Methods:

• A library of 48 flavonoids with diverse functional groups was tested against HPL and PPL.
• Kinetic parameters and inhibition mechanisms of active flavonoids were determined.
• In silico docking studies were performed on potent flavonoids using the HPL active site.

Main Results:

• Enzyme activity varied between HPL and PPL.
• Flavonoid inhibition of HPL was significantly influenced by C-3 alkyl groups, C2=C3 double bonds, and B-ring pyrogallol substituents.
• Docking scores strongly correlated with inhibitory activity, identifying key interactions with HPL active site residues.

Conclusions:

• Specific flavonoid structures, particularly those with alkyl and pyrogallol groups, demonstrate potent HPL inhibition.
• The identified flavonoids exhibit binding characteristics similar to orlistat, validating their potential as HPL inhibitors.
• Structure-activity relationship analysis provides a basis for designing novel anti-obesity agents targeting HPL.