Inhibition of human telomerase activity by peptide nucleic acids

Area of Science:

• Biochemistry
• Molecular Biology
• Medicinal Chemistry

Background:

• Human telomerase is a key enzyme in cellular immortalization and cancer.
• Developing specific inhibitors of telomerase is crucial for cancer therapy.
• Current inhibitors like phosphorothioate (PS) oligomers lack sequence selectivity.

Purpose of the Study:

• To investigate the efficacy of peptide nucleic acids (PNAs) as inhibitors of human telomerase.
• To compare the inhibitory potential and selectivity of PNAs against PS oligomers.
• To explore the potential of PNAs in developing novel telomerase-targeting agents.

Main Methods:

• Synthesis and application of PNAs targeting the RNA component of human telomerase (hTR).
• Enzymatic assays to determine IC50 values for PNA and PS oligomer inhibition.
• Evaluation of sequence-specific binding and inhibition efficiency.

Main Results:

• PNAs inhibited human telomerase activity with high potency (picomolar to nanomolar IC50 values).
• Inhibition by PNAs was sequence-dependent, targeting functional boundaries of hTR.
• PNAs demonstrated 10- to 50-fold greater efficiency and higher selectivity than PS oligomers.
• PS oligomers exhibited non-sequence-selective inhibition of telomerase.

Conclusions:

• PNAs represent a potent and highly specific class of inhibitors for human telomerase.
• PNAs offer significant advantages over PS oligomers in terms of affinity and specificity.
• PNAs are promising tools for controlling ribonucleoprotein enzymatic activity and developing telomerase inhibitors and probes.