ArticleBiopolymers2022
Cellular uptake of 2-aminopyridine-modified peptide nucleic acids conjugated with cell-penetrating peptides.
Article in Biopolymers, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 7 papers.
What it found
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
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Who cites it
7 citing papers in PubMed, 10 citations in OpenAlex.
- Modulating G-quadruplexes for therapeutic intervention: Structural diversity, stability, and emerging nucleic-acid-based strategies.Molecular therapy. Nucleic acids · 2026Review
- Multiple Charged Purine (MCP) PNA as a Simple Mode for Cellular Uptake.ACS polymers Au · 2026Article
- 5-Triazolyl uracil improves nucleobase stacking, pyrimidine recognition, biological activity, and specificity of RNA-binding triplex-forming peptide nucleic acids.Nucleic acids research · 2026Article
- Nucleobase-Modified Triplex-Forming Peptide Nucleic Acids for Sequence-Specific Recognition of Double-Stranded RNA and DNA.Methods in molecular biology (Clifton, N.J.) · 2026Article
- Recent Cutting-Edge Technologies for the Delivery of Peptide Nucleic Acid.Chemistry (Weinheim an der Bergstrasse, Germany) · 2025Review
- Triplex-forming peptide nucleic acids as emerging ligands to modulate structure and function of complex RNAs.Chemical communications (Cambridge, England) · 2024Review
- Comparison of 2-Aminopyridine and 4-Thiopseudisocytosine PNA Nucleobases for Hoogsteen Recognition of Guanosine in RNA.ACS omega · 2024Article
Corrections and comments
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Authors and funding
5 authors at 1 institution in 1 country.
Funding
Abstract
Cell-penetrating peptides (CPPs) have been extensively used to deliver peptide nucleic acid (PNA) in cells. We have previously found that replacement of cytosine in triplex-forming PNAs with 2-aminopyridine (M) not only enhanced RNA binding, but also improved cellular uptake of PNAs. In this study, we used confocal fluorescence microscopy to evaluate the ability of CPPs to further improve cellular uptake of M-modified PNAs. We found that PNAs conjugated with Tat and octa-arginine peptides were effectively taken up in MCF7 cells when supplied in cell media at 1 μM. Remarkably, M-modified PNA without any CPP conjugation also showed strong uptake when the concentration was increased to 5 μM. Majority of PNA conjugates remained localized in distinct cytoplasmic vesicles, as judged by dot-like fluorescence patterns. However, M-modified PNAs conjugated with Tat, octa-arginine, and even a simple tri-lysine peptide also showed dispersed fluorescence in cytoplasm and were taken up in nuclei where they localized in larger vesicles, most likely nucleoli. Endosomolytic peptides or chemicals (chloroquine and CaCl
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Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.