Chemists have designed a carbohydrate-based molecule that can surround and strangle bone cancer cells by self-assembling into a tangled web of nanofibers. The molecule spares healthy cells because its assembly is triggered by an enzyme that’s overexpressed on cancer cells.
The inspiration for spinning a molecular cage around cells came from nature, says Rein V. Ulijn of the City University of New York’s Hunter College. Many of the body’s cells are enmeshed in an extracellular matrix—a complex web of biomolecules that provides structure for tissues, facilitates intercellular communication, and traps nutrients. Scientists are developing molecules that spontaneously assemble into simpler versions of this matrix to provide a growth medium for cells, in particular for tissue engineering.
The field has focused mainly on self-assembling peptides. In a recent study, Bing Xu of Brandeis University and colleagues designed a nonnurturing peptide that aggregates and engulfs cancer cells only when its phosphate group is removed. The phosphate-free peptides have a hydrophilic end and a hydrophobic one, which allow them to assemble like lipids in a cell membrane. The negative charge on the phosphate groups creates electrostatic repulsion between the molecules and prevents this. This phosphate on-off switch is great for targeting cancer because some types of cancer cells overexpress alkaline phosphatase, an enzyme that cleaves phosphates.
The study nicely demonstrates that high enzyme activity can serve as a way to target cancer cells, Brandeis’s Xu says. One concern Xu has is that the team needed to use concentrations of the molecule that are higher than are typical for drugs. High concentrations often require large doses for patients, which usually mean high risk of side effects. Ulijn agrees that his team needs to study possible side effects of their self-assembling carbohydrates.
Read full, original article: Designed Molecules Trap Cancer Cells in Deadly Cages