Cell Permeability
Cell Permeability — The ability of a compound to cross cellular membranes, a key challenge in peptide drug design due to their typically polar nature.
What Is Cell Permeability?
Cell permeability is the ability of a peptide to cross the cell membrane and reach intracellular targets. Most linear peptides are cell-impermeable due to their size, polarity, and number of hydrogen bond donors. Achieving cell permeability is the central challenge in peptide drug design for intracellular targets.
Permeability Strategies
- CPP conjugation: Attach a cell-penetrating peptide (TAT, penetratin) as a delivery vector
- N-methylation: Reduce H-bond donors, increase passive permeability (cyclosporine model)
- Macrocyclization: Intramolecular H-bonds mask polarity. "Chameleon" peptides
- Caco-2 assay: Standard in vitro model measuring apparent permeability (Papp)
Frequently Asked Questions
What is Cell Permeability?
The ability of a compound to cross cellular membranes, a key challenge in peptide drug design due to their typically polar nature.
Why is Cell Permeability important in peptide research?
Cell Permeability is a fundamental concept in pharmacology as it relates to peptide science. It directly influences experimental design, compound characterization, and the reliability of research outcomes across biochemistry and molecular biology disciplines.
Authority Sources
- Cell Permeability on Wikipedia
- Search Cell Permeability on PubChem (NIH)
- Research articles on ScienceDirect