Aptamer-Based Enforced Phosphatase-Recruiting Chimeras Inhibit Receptor Tyrosine Kinase Signal Transduction

Area of Science:

• Biochemistry
• Molecular Biology
• Drug Discovery

Background:

• Aberrant receptor tyrosine kinase (RTK) phosphorylation drives tumor initiation, progression, and metastasis.
• Developing targeted molecular tools to regulate RTK phosphorylation is a significant challenge in cancer therapy.

Purpose of the Study:

• To design and validate novel aptamer-based chimeras for inhibiting RTK phosphorylation.
• To explore the mechanism of action involving protein tyrosine phosphatase receptor type F (PTPRF) recruitment.
• To establish a basis for developing new phosphatase-recruiting therapeutic strategies.

Main Methods:

• Construction of aptamer-based chimeras targeting specific RTKs (e.g., c-Met, EGFR).
• Assessment of chimera efficacy in inhibiting RTK phosphorylation in various cell lines.
• Evaluation of PTPRF recruitment and its effect on cell biological behaviors.
• Determination of the catalytic radius of PTPRF using DNA duplexes.

Main Results:

• Aptamer-based chimeras demonstrated potent and generic inhibition of RTK phosphorylation induced by growth factors or auto-dimerization.
• Chimeras effectively modulated cell behaviors through PTPRF recruitment.
• The catalytic radius of PTPRF was precisely determined to be approximately 25.84 nm.

Conclusions:

• The study presents a versatile methodology for selectively controlling RTK phosphorylation and cellular processes.
• Developed aptamer-based chimeras offer a promising avenue for novel therapeutic drug development.
• This work provides a foundation for designing advanced phosphatase-recruiting strategies.