A novel cell-penetrating peptide derived from the CDN1 protein was computationally identified and experimentally validated for cellular uptake and intracellular labeling, expanding the CPP toolkit for drug delivery.
In silico → validatedComputational prediction successfully identified a functional CPP that was experimentally confirmed — demonstrating efficient CPP discovery
What the researchers found
A novel CPP derived from CDN1 was identified through in silico screening and experimentally validated for cellular uptake and intracellular labeling in living cells.
Why it matters
Many promising drugs can't get inside cells. Each new CPP discovered adds to the toolkit for intracellular drug delivery, and computational identification accelerates discovery compared to trial-and-error approaches.
The numbers in context
CDN1-derived; concentration-dependent; receptor-mediated endocytosis; no hemolysis; HaloTag delivery confirmed
How the study worked
Computational (in silico) screening for CPP sequences in CDN1 protein. Peptide synthesis. Experimental validation of cellular uptake and intracellular labeling by fluorescence microscopy.
Who was studied
Multiple cell lines and red blood cells
What this study cannot tell us
Basic cellular uptake validation only. Cargo delivery capacity not tested. Cell type specificity not characterized. In vivo behavior unknown.
How to read the evidence
Low evidence grade: proof-of-concept CPP identification with basic uptake validation only.
When this study was published
Published 2021. Computational CPP prediction methods continue to improve with machine learning approaches.
The bigger picture
The growing library of CPPs provides options for delivering different types of therapeutic cargo. Computational prediction is making CPP discovery faster and more systematic, potentially enabling patient-specific or drug-specific CPP selection.
Questions still open
- Can this CDN1-derived CPP efficiently deliver therapeutic cargo like drugs or nucleic acids?
- How does it compare in efficiency to established CPPs like TAT and penetratin?
- Does it show selectivity for any particular cell types?
Common questions
What are cell-penetrating peptides used for?
How was this new CPP discovered?
Read the original research
In silico identification and experimental validation of cellular uptake and intracellular labeling by a new cell penetrating peptide derived from CDN1.
Drug delivery, 28(1), 1722-1736
Citation
Guo, Xiangli; Chen, Linlin; Wang, Lidan; Geng, Jingping; Wang, Tao; Hu, Jixiong; Li, Jason; Liu, Changbai; Wang, Hu. (2021). In silico identification and experimental validation of cellular uptake and intracellular labeling by a new cell penetrating peptide derived from CDN1.. Drug delivery, 28(1), 1722-1736. https://doi.org/10.1080/10717544.2021.1963352