Development and validation of a hedgehog heparin-binding assay for high-throughput screening

Area of Science:

• Biochemistry
• Molecular Biology
• Drug Discovery

Background:

• Sonic hedgehog (Shh) is a key morphogenic protein involved in embryonic development and cancer.
• Heparin and heparan sulfate proteoglycans (HSPGs) significantly influence Shh pathway activity.
• Targeting Shh pathway inhibitors holds therapeutic potential for various diseases.

Purpose of the Study:

• To develop and validate a high-throughput screening (HTS) assay for identifying antagonists of Shh-heparin binding.
• To establish a cost-effective method for screening small molecules that disrupt Shh-heparin interactions.

Main Methods:

• A solid-phase plate-based assay was designed using the N-terminal domain of Shh (ShhN) coated on 384-well plates.
• Fluorescein-labeled heparin (flu-heparin) binding to ShhN was quantified via fluorescence measurement.
• Assay validation included ELISA confirmation of ShhN binding and Z' factor determination (0.68-0.75).

Main Results:

• An optimized and validated assay for detecting Shh-heparin binding was successfully established.
• The assay demonstrated reliability and efficiency for high-throughput screening.
• The method provides a cost-effective format for identifying Shh heparin binding antagonists.

Conclusions:

• The developed HTS assay is a valuable tool for discovering small molecule inhibitors of the Shh pathway.
• This assay facilitates the identification of novel therapeutic agents by targeting Shh-heparin interactions.
• The validated screening method offers a robust platform for advancing Shh pathway research and drug development.