SialoPen: Synthetic Peptide Foldamers That Outperform Classic Cell-Penetrating Peptides
Newly designed SialoPen peptides based on a sialic acid scaffold showed significantly superior cell penetration compared to penetratin and HIV-TAT in both cancer and neuronal cells.
Quick Facts
What This Study Found
SialoPen peptides — de novo designed foldamers using a Neu2en scaffold — demonstrated significantly superior cellular uptake compared to classical CPPs penetratin and HIV-TAT in both HeLa and neuronal cells.
Key Numbers
Superior uptake vs penetratin and TAT; confirmed by flow cytometry and confocal; Fmoc SPPS compatible; enhanced biostability
How They Did This
In-vitro study using flow cytometry and live-cell confocal microscopy to compare uptake of SialoPen peptides versus penetratin and HIV-TAT in HeLa cells and primary hippocampal neurons.
Why This Research Matters
Many potential drugs cannot cross cell membranes. SialoPen peptides offer a new delivery platform with better penetration than existing options, potentially unlocking previously inaccessible intracellular drug targets.
The Bigger Picture
SialoPen represents a new generation of synthetic cell-penetrating foldamers that move beyond natural amino acids, offering designers more control over structure, stability, and membrane permeability.
What This Study Doesn't Tell Us
In-vitro study with two cell types only; no in-vivo data; cargo delivery not tested; long-term cytotoxicity not fully characterized.
Questions This Raises
- ?Can SialoPen peptides deliver therapeutic cargo like siRNA or proteins as effectively as they penetrate alone?
- ?How do SialoPen peptides perform in vivo — biodistribution, stability, clearance?
- ?Could the Neu2en scaffold be optimized further for tissue-specific targeting?
Trust & Context
- Key Stat:
- Outperforms penetratin and TAT SialoPen foldamers showed significantly superior uptake in both HeLa cancer cells and primary hippocampal neurons
- Evidence Grade:
- Well-characterized in-vitro study with head-to-head comparisons against established CPPs using quantitative flow cytometry and imaging.
- Study Age:
- Published in 2020; foldamer-based CPPs are an emerging area with growing interest in drug delivery.
- Original Title:
- SialoPen peptides are new cationic foldamers with remarkable cell permeability.
- Published In:
- Heliyon, 6(12), e05780 (2020)
- Database ID:
- RPEP-05006
Evidence Hierarchy
Frequently Asked Questions
What are SialoPen peptides?
A new class of synthetic cell-penetrating peptides built on a sialic acid scaffold, designed to enter cells more efficiently than existing CPPs like penetratin and HIV-TAT.
Why are foldamer CPPs better than natural ones?
Foldamers use unnatural building blocks that resist degradation, offer tunable secondary structures, and in this case show superior cell penetration compared to peptides made from natural amino acids.
Read More on RethinkPeptides
Cite This Study
https://rethinkpeptides.com/research/RPEP-05006APA
Monreal, I Abrrey; Contreras, Erik M; Wayman, Gary A; Aguilar, Hector C; Saludes, Jonel P. (2020). SialoPen peptides are new cationic foldamers with remarkable cell permeability.. Heliyon, 6(12), e05780. https://doi.org/10.1016/j.heliyon.2020.e05780
MLA
Monreal, I Abrrey, et al. "SialoPen peptides are new cationic foldamers with remarkable cell permeability.." Heliyon, 2020. https://doi.org/10.1016/j.heliyon.2020.e05780
RethinkPeptides
RethinkPeptides Research Database. "SialoPen peptides are new cationic foldamers with remarkable..." RPEP-05006. Retrieved from https://rethinkpeptides.com/research/monreal-2020-sialopen-peptides-are-new
Access the Original Study
Study data sourced from PubMed, a service of the U.S. National Library of Medicine, National Institutes of Health.
This study breakdown was produced by the RethinkPeptides research team. We analyze and report published research findings without making health recommendations. All interpretations are based solely on the published abstract and study data.