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.
Outperforms penetratin and TATSialoPen foldamers showed significantly superior uptake in both HeLa cancer cells and primary hippocampal neurons
What the researchers 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.
Why it 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 numbers in context
Superior uptake vs penetratin and TAT; confirmed by flow cytometry and confocal; Fmoc SPPS compatible; enhanced biostability
How the study worked
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.
Who was studied
HeLa cancer cells and primary hippocampal neurons treated with SialoPen peptides vs penetratin and TAT
What this study cannot tell us
In-vitro study with two cell types only; no in-vivo data; cargo delivery not tested; long-term cytotoxicity not fully characterized.
How to read the evidence
Well-characterized in-vitro study with head-to-head comparisons against established CPPs using quantitative flow cytometry and imaging.
When this study was published
Published in 2020; foldamer-based CPPs are an emerging area with growing interest in drug delivery.
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.
Questions still open
- 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?
Common questions
What are SialoPen peptides?
Why are foldamer CPPs better than natural ones?
Read the original research
SialoPen peptides are new cationic foldamers with remarkable cell permeability.
Heliyon, 6(12), e05780
Citation
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